View RF2938_5621467.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

2-1 11 transceivers product description ordering information typical applications features functional block diagram rf micro devices, inc. 7628 thorndike road greensboro, nc 27409, usa tel (336) 664 1233 fax (336) 664 0454 http://www.rfmd.com optimum technology matching? applied si bjt gaas mesfet gaas hbt si bi-cmos sige hbt si cmos 1 2 3 4 5 6 7 8 9 10 11 12 36 35 34 33 32 31 30 29 28 27 26 25 48 45 46 47 44 43 42 41 40 39 38 37 13 16 15 14 17 18 19 20 21 22 23 24 tx if in rx if in vcc1 tx en rx en pd nc nc vcc9 tx vgc if lo vcc8 nc nc nc nc nc nc nc nc nc rf out rf out vcc6 pa in vcc5 rf lo rf out if1 out- rxq data qout rxi data iout vcc4 txq data txq bp txi data txi bp if1 out+ rssi dcfb i dcfb q vcc3 vref 2 bw ctrl vcc2 vref 1 rx vgc i q i q tx_en rx_en rx tx +45 -45 2 RF2938 2.4ghz spread-spectrum transceiver wirelesslans wireless local loop secure communication links inventory tracking wireless security digital cordless telephones the RF2938 is a monolithic integrated circuit specifically designed for direct-sequence spread-spectrum systems operating in the 2.4ghz ism band. the part includes a direct conversion from if receiver, quadrature demodula- tor, i/q baseband amplifiers with gain control and rssi, on-chip programmable baseband filters, dual data com- parators. for the transmit side, a qpsk modulator and upconverter are provided. the design reuses the if saw filter for transmit and receive reducing the number of saw filters required. two cell or regulated three cell (3.6v maximum) battery applications are supported by thepart.thepartisalsodesignedtobepartofa2.4ghz chip set consisting of the rf2444 lna/mixer and one of the many rfmd high efficiency gaas hbt pa?s and a dual frequency synthesizer. 45mhz to 500mhz if quad demod on-chip variable baseband filters quadrature modulator and upconverter 2.7v to 3.6v operation part of 2.4ghz radio chipset 2.4ghz pa driver RF2938tr13 2.4ghz spread-spectrum transceiver (tape & reel) RF2938 pcba fully assembled evaluation board 2 rev a8 010418 dimensions in mm 9.00 +0.10 9.00 +0.20 0.22 +0.05 7 max 0 min 0.17 max. 0.60 0.15 0.10 + 0.10 0.00 1.00 +0.10 -a- 0.50 7.00 +0.10sq. 4.57 +0.10sq. notes: 1. shaded lead is pin 1. 2. lead coplanarity - 0.08 with respect to datum "a". 3. leadframe material: eftec 64t copper or equivalent, 0.127 mm (0.005) thick. 4. solder plating (85/15) on exposed area. exposed pad protrusion 0.0000 to 0.0127 (see note 4). package style: tqfp-48 edf, 9x9
2-2 RF2938 rev a8 010418 11 transceivers absolute maximum ratings parameter rating unit supply voltage -0.5 to +3.6 v dc control voltages -0.5 to +3.6 v dc input rf level +12 dbm lo input levels +5 dbm operating ambient temperature -40 to +85 c storage temperature -40 to +150 c moisture sensitivity jedec level 5 @ 220c parameter specification unit condition min. typ. max. overall receiver t=25 c, v cc =3.3v, freq=280mhz, r bw =10k ? rx frequency range 45 500 mhz cascaded voltage gain 8 to 93 db dependent upon rx vgc cascaded noise figure 5 db at maximum gain. cascaded input ip 3 30 db vv gc <1.2v cascaded input ip 3 105 db vv gc >2.0v rssi dynamic range 60 db at v gc =1.4v rssi output voltage compli- ance 1.1 to 2.3 v maximum rssi is 2.5v or v cc -0.3, which- ever is less. v gc =1.4v if lo leakage -68 dbm f=280mhz, lo power=-10dbm quadrature phase variation 2 5 with expected lo amplitude and harmonic content. r1=270k ?. quadrature amplitude offset +0.25 db q>i quadrature amplitude variation 0.25 + 0.5 db if amp and quad demod gain control range 43 db vgc <1.2v max gain, vgc>2.0v=min gain noise figure 5 db single sideband if input impedance 230-j400 ? single ended. 280mhz 75-j350 ? single ended. 374mhz input ip 3 -68 dbm v gc <1.2v -8 dbm v gc >2.0v rx baseband amplifiers thd 3 % at maximum gain setting 3 % at minimum gain setting gain control range 30 db v gc <1.2v=max gain, v gc >2.0v=min gain output voltage 500 mv pp r l > 5k ? ,c l < 5pf dc output voltage 1.7 v rx baseband filters baseband filter 3db bandwidth 1 35 mhz 5th order bessel lpf. set by bw ctrl passband ripple 0.1 db baseband filter 3db frequency accuracy 10 30 % group delay 15 ns at 35mhz, increasing as bandwidth decreases. group delay 400 ns at 2mhz. baseband filter ultimate rejec- tion >80 db output impedance 20 ? designed to drive> 5k ? ,< 5pf load. caution! esd sensitive device. rf micro devices believes the furnished information is correct and accurate at the time of this printing. however, rf micro devices reserves the right to make changes to its products without notice. rf micro devices does not assume responsibility for the use of the described product(s). refer to ?handling of psop and pssop products? on page 16-15 for special handling information. refer to ?soldering specifications? on page 16-13 for special solder- ing information.
2-3 RF2938 rev a8 010418 11 transceivers parameter specification unit condition min. typ. max. data amplifiers bandwidth 40 mhz gain (limiting mode) 60 db open loop. rise and fall time 2 5 ns 5pf load. logic high output v cc -0.3v v cc v source current 1ma logic low output 0.3 v sink current 1ma. hysteresis 30 mv transmit modulator and lpf filter gain 0 db any setting baseband filter 3db bandwidth 1 35 mhz 5th order bessel lpf, set by bw ctrl passband ripple 0.1 db group delay 15 ns at 35mhz, increasing as bandwidth decreases. group delay 400 ns at 2mhz. ultimate rejection >80 db input impedance 3 k ? single ended input ac voltage 200 mv p-p linear, single ended. input dc offset requirement 1.6 1.7 1.8 v for correct operation. if frequency range 45 500 mhz output impedance 2 k ? open collector when tx on, hi-z when off i/q phase balance 2 5 i/q gain balance 0.50.25 1.0 db conversion voltage gain 1.1 v/v with current combination into 50 ? single- ended load output p1db -6 dbm with current combination into 50 ? single- ended load carrier output -30 dbm without external offset adjustments. 280mhz harmonic outputs -30 dbc transmit vga and upconverter vga gain range 17 db vga input voltage range 1.0 to 2.0 v positive slope vga gain sensitivity 17 db/v vga input impedance 230-j400 ? 280mhz 75-j350 ? 374mhz rf mixer output impedance 50 ? with matching elements. vga/mixer conversion gain +10 to +27 db with 50 ? match on the output. vga/mixer output power -9 dbm 1db compression - single side band, tx gc=1.0v vga/mixer output power -4 dbm 1db compression - single side band, tx gc=2.0v
2-4 RF2938 rev a8 010418 11 transceivers parameter specification unit condition min. typ. max. transmit power amp linear output power 6 dbm gain 23 db output p1db 12 dbm output impedance 50 ? input ip3 0 dbm input impedance 50 ? power down control logical controls ?on? v cc -0.3v v cc +0.3v v voltage supplied to the input, not to exceed 3.6v logical controls ?off? -0.3 0 0.3 v voltage supplied to the input. control input impedance >1 m ? rssi response time 1.8 s< 8pf on rssi output. rx v gc response time 200 ns full step in gain, to 90% of final output level. rx en response time 2 s i/q output valid tx en response time 330 ns to if output valid v pd to rx response time 1.33 ms to i/q output valid v pd to tx response time 50 s to if output valid if lo input the if lo is divided by 2 and split into quadrature signals to drive the frequency mixers. input impedance 1050-j1200 ? f=560mhz input power range -15 -10 0 dbm peak input frequency 90 1000 mhz (2x if frequency) rf lo input input impedance 33-j110 ? f=2.16ghz untuned. input power range -15 0 dbm input frequency 2000 2400 mhz power supply voltage 2.7 3.3 3.6 v total current consumption v cc =3.3v, baseband bw 1mhz to 40mhz sleep mode current 1 apd=0,rxen=1,txen=1 pa driver current 48 ma rx current bw (mhz) 0-11 65 ma 12-20 70 ma 20-30 110 ma tx current bw (mhz) excluding pa driver 0-11 95 ma 12-20 105 ma 20-30 115 ma
2-5 RF2938 rev a8 010418 11 transceivers pin function description interface schematic 1nc no internal connection. may be grounded or connected on adjacent signal or left floating. connect to ground for best results. 2nc no internal connection. may be grounded or connected on adjacent signal or left floating. connect to ground for best results. 3pd this pin is used to power up or down the transmit and receive base- band sections. a logic high powers up the quad demod mixers, tx and rx gmc lpf?s, baseband vga amps, data amps, and if lo buffer amp/ phase splitter. a logic low powers down the entire ic for sleep mode. also, see state decode table. 4rxen enable pin for the receiver 15db gain if amp and the rx vga amp. powers up all receiver functions when pd is high, turns off the receiver if circuits when low. also, see state decode table. see pin 3. 5txen this pin is used to enable the transmit upconverter, buffer amps, 15db if amp, quad mod mixers, tx lo buffer, tx vga, and pa driver. tx en is active low, when tx en <1v, the transmit circuit is active if pd is high. a logic high (tx en >2v) disables the transmit if/rf circuitry and quad mod. also, see state decode table. see pin 3. 6vcc1 power supply for rx vga amplifier, ic logic and rx references. 7rxifin if input for receiver section. must have dc blocking cap. the capacitor value should be appropriate for the if frequency. external matching to 50 ? recommended. for half duplex operation, connect rx if in and tx if in signals together after the dc blocking caps, then run a trans- mission line from the output of the if saw. ac coupling capacitor must be less than 150pf to prevent delay in switching rx to tx/tx to rx. see pin 8. 8txifin input for the tx if signal after saw filter. external dc blocking cap required. external matching to 50 ? recommended. for half duplex operation, connect rx if in and tx if in signals together after the dc blocking caps, then run a transmission line from the output of the if saw. ac coupling capacitor must be less than 150pf to prevent delay in switching rx to tx/tx to rx. 9vcc9 power supply for the tx 15db gain amp and tx vga. 10 tx vgc gain control setting for the transmit vga. positive slope. 11 if lo if lo input. must have dc blocking cap. the capacitor value should be appropriate for the if frequency. lo frequency=2xif. quad mod/ demod phase accuracy requires low harmonic content from if lo, so it is recommended to use an n=3 lpf between the if vco and if lo. this is a high impedance input and the recommended matching approach is to simply add a 100 ? shunt resistor at this input to con- strain the mismatch. this pin requires a 6.5 a dc bias current. this can be accomplished with a 270k ? resistor to v cc for 3.3v operation. 12 vcc8 power supply for if lo buffer and quadrature phase network. 13 nc no internal connection. may be grounded or connected on adjacent signal or left floating. connect to ground for best results. 14 rf out this is the output transistor of the power amp stage. it is an open col- lector output. the output match is formed by an inductor to v cc ,which supplies dc and a series cap. 15 rf out this is the output transistor of the power amp stage. it is an open col- lector output. the output match is formed by an inductor to v cc ,which supplies dc and a series cap. see pin 14. 16 vcc6 power supply for the pa driver amp. this inductance to ground via decoupling, along with an internal series capacitor, forms the interstage match. see pin 14. 10k ? esd vcc to logic pins 3, 4, 5 dc block 50 ? strip if saw filter pin 7 pin 8 if vco c2 150 pf if lo pin 11 recommended matching network for if lo 100 ? 270 k ? v cc from tx rf image filter bias vcc6 pin 16 v cc c byp 22 nf v cc c byp 22 nf pa out pin 14 pa out pin 15 pa in pin 18 power amp output 34 ma 14 ma strip bias
2-6 RF2938 rev a8 010418 11 transceivers pin function description interface schematic 17 nc no internal connection. may be grounded or connected on adjacent signal or left floating. connect to ground for best results. 18 pa in input to the power amplifier stage. this is a 50 ? input. requires dc blocking/tuning cap. see pin 14. 19 nc no internal connection. may be grounded or connected on adjacent signal or left floating. connect to ground for best results. 20 vcc5 supply for the rf lo buffer, rf upconverter and amplifier. 21 rf lo single ended lo input for the transmit upconverter. external matching to 50 ? and a dc block are required. see pin 20. 22 rf out upconverted transmit signal. this 50 ? output is intended to drive an rf filter to suppress the undesired sideband, harmonics, and other out- of-band mixer products. see pin 20. 23 if1 out- the inverting open collector output of the quadrature modulator. this pin needs to be externally biased and dc isolated from other parts of the circuit. this output can drive a balun with if1 out+, to convert to unbalanced to drive a saw filter. the balun can be either broadband (transformer) or narrowband (discrete lc matching). alternatively, just if1 out+ can be used to drive a saw single-ended with an rf choke (high z at if) from v cc to if1 out-. 24 nc no internal connection. may be grounded or connected on adjacent signal or left floating. connect to ground for best results. 25 if1 out+ the non-inverting open collector output of the quadrature modulator. this pin needs to be externally biased and dc isolated from other parts of the circuit. this output can drive a balun with if1 out-, to convert to unbalanced to drive a saw filter. the balun can be either broadband (transformer) or narrowband (discrete lc matching). alternatively, just if1 out+ can be used to drive a saw single-ended with an rf choke (high z at if) from v cc to if1 out+. see pin 23. 26 txi bp this is the in-phase modulator bypass pin. a 10nf capacitor to ground is recommended. 27 txi data i input to the baseband 5 pole bessel lpf for the transmit modulator. 28 txq bp this is the quadrature modulator bypass pin. a 10nf capacitor to ground is recommended. 29 txq data q input to the baseband 5 pole bessel lpf for the transmit modulator. 30 vcc4 power supply for quadrature modulator. 31 i out baseband analog signal output for in-phase channel. 500mv p-p linear output. 32 rxi data logic-level data output for the in-phase channel. this is a digital output signal obtained from the output of a schmitt trigger. 0.3v to vcc3 - 0.3v swing minimum. 33 q out baseband analog signal output for quadrature channel. 500mv p-p linear output. 34 rxq data logic-level data output for the quadrature channel. this is a digital out- put signal obtained from the output of a schmitt trigger. 0.3v to vcc3 - 0.3v swing minimum. 35 nc no internal connection. may be grounded or connected on adjacent signal or left floating. connect to ground for best results. c block 22 pf to tx rf image filter 12 ma from tx vga v cc c byp 22 nf vcc5 pin 20 v cc c byp 22 nf rf out pin 22 vb rf lo pin 21 from rf vco if1 out+ if1 out-
2-7 RF2938 rev a8 010418 11 transceivers pin function description interface schematic 36 nc no internal connection. may be grounded or connected on adjacent signal or left floating. connect to ground for best results. 37 nc no internal connection. may be grounded or connected on adjacent signal or left floating. connect to ground for best results. 38 rssi received signal strength indicator. connect 8.2pf to ground. output impedance is 40k ? in parallel with 2pf. 39 dcfb i dc feedback capacitor for in-phase channel. requires decoupling capacitor to ground. (22nf recommended) 40 dcfb q dc feedback capacitor for quadrature channel. requires capacitor to ground. (22nf recommended) 41 vcc3 supply for the i and q data amps.this pin should be bypassed with a 10nf capacitor connected as direct as possible to gnd3. ground this pin if data amps are not used. 42 vref 2 gain control reference voltage. no current should be drawn from this pin (<50 a). 2.0v nominal. 43 nc no internal connection. may be grounded or connected on adjacent signal or left floating. connect to ground for best results. 44 bw ctrl this pin requires a resistor to ground to set the baseband lpf band- width of the receiver and transmit gmc filter amps. 45 vcc2 supply for the i and q baseband and gmc filters. this pin should be bypassed with a 10nf capacitor. 46 vref 1 this is a bypass pin for the bias circuits of the gmc filter amps and for i/q inputs. no current should be drawn from this pin (<10 a). 1.7v nominal. 47 rx vgc receiver if and baseband amp gain control voltage. negative slope. 48 nc no internal connection. may be grounded or connected on adjacent signal or left floating. connect to ground for best results. pkg base ground for all circuitry in the device. a very low inductance from the base to the pcb groundplane is essential for good performance. use an array of vias immediately underneath the device. esd this diode structure is used to provide electrostatic discharge protec- tion to 3kv using the human body model. the following pins are pro- tected: 3-6, 9, 10, 12, 26-34, 38-42, 44-47. v cc
2-8 RF2938 rev a8 010418 11 transceivers state decode table input pins internally decoded signals pd rx en tx en bb en rxif en txrf en sleep mode 0 x x 0 0 0 baseband only 1 0 1 1 0 0 receive mode 1 1 1 1 1 0 transmit mode 1 0 0 1 0 1 full duplex 1 1 0 1 1 1 notes bb_en enables: tx_lpf?s and buffers quad demodulator mixers baseband vga and gm-c lpf?s data amplifiers if lo buffer/phase splitters rxif_en enables: front-end if amplifier (rx) rx if vga amplifiers txrf_en enables: front-end if amplifier (tx) tx vga rf upconverter and buffer pa driver rf lo buffer quad modulator mixers
2-9 RF2938 rev a8 010418 11 transceivers detailed functional block diagram logic 15 db 15 db ref phase splitter 25 db bw control dc feedback gm-c lpf +5 db gm-c lpf dc feedback gm-c lpf tx bias gm-c lpf -1.5 db 3.5 db 0-30 db vcc8 12 if lo 11 tx vgc 10 vcc9 9 tx if in 8 rx if in 7 vcc1 6 tx en 5 rx en 4 pd 3 nc 2 nc 1 if1 out- 23 nc 24 22 rf out rf lo 21 vcc5 20 nc 19 pa in 18 nc 17 vcc6 16 15 rf out rf out 14 nc 13 nc 36 nc 35 qout 33 iout 31 vcc4 30 txq data 29 txi data 27 txi bp 26 if1 out+ 25 44 bw ctrl nc 48 rx vgc 47 vref 1 46 vcc2 45 nc 43 vref 2 42 vcc3 41 dcfb q 40 dcfb i 39 rssi 38 nc 37 rx tx 2 0db +6 db +6 db 0db 0-30 db +5 db rxq data 34 rxi data 32 txq bp 28 -20to-3db -6 to 37 db
2-10 RF2938 rev a8 010418 11 transceivers theory of operation receiver rx if agc/mixer the front end of the if agc starts with a single-ended input and a constant gain amp of 15db. this first amp stage sets the noise figure and input impedance of the if section, and its output is taken differentially. the rest of the signal path is differential until the final baseband output, which is converted back to single-ended. fol- lowing the front end amp are multiple stages of vari- able gain differential amplifiers, giving the if signal path a gain range of 9db to 52db. the noise figure (in max gain mode) of the if amplifiers is 5db, which should not degrade the system noise figure. the if to bb mixers are double-balanced, differential in, differential out, mixers with 5db conversion gain. the lo for each of these mixers is shifted 90 so that the i and q signals are separated in the mixers. rx baseband amps, filters, data slicers, and dc feedback at baseband frequency, there are multiple agc amplifi- ers offering a gain range of 0db to 30db. following these amplifiers are fully integrated gm-c low pass fil- ters to further filter out-of-band signals and spurs that get through the saw filter, anti-alias the signal prior to the a/d converter, and to band-limit the signal and noise to achieve optimal signal-to-noise ratio. the 3db cut-off frequency of these low pass filters is program- mable with a single external resistor, and continuously variablefrom1mhzto35mhz.afive-polebesseltype filter response was chosen because it is optimal for data systems due to its flat delay response and clean step response. butterworth and chebychev type filters ring when given a step input making them less ideal for data systems. the filter outputs, with +6dbm gain, drive the linear 500mv pp signal off-chip, but also connect internally to a data slicer which squares up the signal to cmos lev- els, and drives this ?data? signal off-chip. this data slicer is a high speed cmos comparator with 30mv of hysteresis and self-aligned input dc offset. this data slicer can be independently disabled if only the linear outputs are desired. dc feedback is built into the baseband amplifier sec- tion to correct for input offsets. large dc offsets can arisewhenamixerloleakstothemixerinputand then mixes with itself. dc offsets can also result from random transistor mismatches. a large external capac- itor is needed for the dc feedback to set the high pass cutoff, and this capacitor is reused to set the dc input level for the self-aligned data slicer. rssi and v gc operation the receive signal path also has an rssi output which is the sum of both the i and q channels. the rssi has about 60dbm of dynamic range and the rssi charac- teristic is optimized to give best linearity and dynamic range at a vgc setting of 1.4v. it is recommended that thesystemsetsvgcto1.4vtotakeanrssireading to make channel activity and signal level decisions, then adjusts vgc to obtain optimum dynamic range from the i out and q out outputs. lo input buffers rf lo buffer the rf lo input has a limiting amplifier before the mixeronboththerf2444(rx)andRF2938(tx).this limiting amplifier design and layout is identical on both ics, which will make the input impedance the same as well. having this amplifier between the vco and mixer minimizes any reverse effect the mixer has on the vco, expands the range of acceptable lo input levels, and holds the lo input impedance constant when switching between rx and tx. the lo input power range is -18dbm to +5dbm, which should make it easy to interface to any vco and frequency synthesizer. if lo buffer the if lo input has a limiting amplifier before the phase splitting network to amplify the signal and help isolate the vco from the ic. also, the lo input signal must be twice the desired intermediate frequency. this simplifies the quadrature network and helps reduce the lo leakage onto the rx_if input pin (since the lo input is now at a different frequency than the if). the amplitude of this input needs to be between -15dbm and 0dbm. excessive if lo harmonic content affects phase balance of the modulator and demodulator so it is recommended that a simple n=3 low pass filter is included between vco and if lo input. the if lo input requires a dc bias current of +6.5 a. this can be accomplished with a 270k ? resistor to v cc for 3.3v operation. failing to provide this will cause a phase imbalance in the if lo quadrature divider of up to 8, whichinturncausesasimilarimbalanceinthei/qout- puts and the t x modulator.
2-11 RF2938 rev a8 010418 11 transceivers transmitter tx lpf and mixers the transmit section starts with a pair of 5-pole bessel filters identical to the filters in the receive section and with the same 3db frequency. these filters pre-shape and band-limit the digital or analog input signals prior to the first upconversion to if. these filters have a high input impedance and expect an input signal of 200mv pp typical. following these low pass filters are the i/q quadrature upconverter mixers. each of these mixers is half the size and half the current of the rf to if downconverter on the rf2444. recall that this upconverted signal may drive the same saw filter (in half duplex mode) as the rf2444 and therefore share thesameload.havingthesumofthetwobbtoifmix- ers equal in size and dc current to the rf to if mixer, will minimize the time required to switch between rx and tx, and will facilitate the best impedance match to the filter. tx vga the agc after the saw filter starts with a switch and a constant gain amplifier of 15db, which is identical to the circuitry on the receive if agc. this was, done, as on the rx signal path, so that the input impedance will remain constant for different tx gain control voltages. following this 15db gain amplifier is a single stage of gain control offering 15db gain range. the main pur- pose of adding this variable gain is to give the system the flexibility to use different saw filters and image fil- ters with different insertion loss values. this gain could also be adjusted real time, if desired. tx upconverter the if to rf upconverter is a double-balanced differ- ential mixer with a differential to single-ended con- verter on the output to supply 0dbm peak linear power to the image filter. the upconverted ssb signal should have -6dbm power at this point, and the image will have the same power, but due to the correlated nature of the signal and image, the output must support 0dbm of linear power to maintain linearly. +6dbm pa driver the ssb output of the upconverter is -6dbm of linear power. the image filter should have at most 4db of insertion loss while removing the image, lo, 2lo and any other spurs. the filter output should supply the pa driver input -10dbm of power. the pa driver is a two-stage class a amplifier with 10db gain per stage and capable of delivering 6dbm of linear power to a 50 ? load, and has a 1db compres- sion point of 12dbm. for lower power applications, this padrivercanbeusedtodrivea50 ? antenna directly.
2-12 RF2938 rev a8 010418 11 transceivers rx 15 db gain il = 3-4 db 2.4 to 2.483 ghz lna dual gain modes -5 db and +10 db gain select rf2444 ssop-16 epp filter 2.4 to 2.483 ghz saw il = 10 db m ax rx tx 15 db 15 db if am p -15dbto35dbgain data q out q rssi data i out i filter filter selectable lpf tx i input q input 15 db gain range +45 -45 il = 3-4 db 2.4 to 2.483 ghz 10 dbm pa driver RF2938 tqfp-48 epp vgc1 vgc2 base band amp. active selectable lpf (f c =1mhzto40mhz) 0-30 db gain rf micro devices 2.4 ghz ism chipset 23 dbm or 33 dbm external pa rf2126 if vco rf vco rf2517 ssop-28 dual frequency synthesizer discrete pin diode 2 figure 1. entire chipset functional block diagram
2-13 RF2938 rev a8 010418 11 transceivers evaluation board schematic (download bill of materials from www.rfmd.com.) baseband amp active selectable lpf (f c =1 mhz to 40 mhz) 0-30 db gain active selectable lpf (f c =1 mhz to 40 mhz) i q i q +45 -45 tx_en 15 db 15 db gain range rx_en 15 db -15 db to 35 db gain if amp 2 1 2 3 4 5 6 7 8 9 10 11 12 36 35 34 33 32 31 30 29 28 27 26 25 48 45 46 47 44 43 42 41 40 39 38 37 13 16 15 14 17 18 19 20 21 22 23 24 c13 100 pf r5 10 ? vcc c16 22 nf c7 100 pf l6 27 nh c25 1pf 50 ? strip j3 if lo c21 22 nf vcc gc tx c3 100 pf l9 68 nh c36 2pf 50 ? strip j2 tx if in l2 150 nh 50 ? strip c4 100 pf j1 rx if in pd vcc tx en rx en c26 12 pf l1 2.7 nh vcc r3* 0 ? 50 ? strip r10* 0 ? c23 22 nf 50 ? strip j4 pa out c24 22 nf vcc c27 2pf 50 ? strip j5 pa in vcc c22 22 nf c28 22 pf l3 3.9 nh c29 3pf 50 ? strip j6 rf lo r8 1k ? l7 220 nh c31 3pf c32 3pf l8 39 nh c34 22 nf vcc c38* 5pf c33 5pf 50 ? strip j8 if out in out sawtek 855392 fl1* 50 ? strip l4 3.9 nh c25 22 nf c30 22 pf 50 ? strip j7 r fout c1 10 nf c2 10 nf c5 0.1 uf 50 ? strip j9 iin c6 0.1 uf 50 ? strip j10 qin vcc c20 22 nf 50 ? strip j11 iout 50 ? strip j14 q data 50 ? strip j13 qout 50 ? strip j12 idata c17 8pf 50 ? strip j15 rssi c18 22 nf c19 22 nf c11 10 nf c10 10 nf r4 10 k ? c15 100 pf r7 10 ? c14 100 pf r6 0 ? vcc vgc notes: 1) r4 is used to set the bandwidth of the gmc filters. 2) pins 14 through 22 contain 2.4 ghz signals. place tuning/bypass components as close as possible. make all lines on these pins 50 ? . 3) for normal operation, move c33 to c38 and install all components with an asterisk. *do not populate. p1 1 2 3 con3 p1-3 gc tx gnd vcc p1-1 c9 10 nf c12 4.7 uf + p2 1 2 3 con3 p2-3 rx en gnd p2-1 tx en p3 1 2 3 con3 p3-3 vgc gnd p3-1 pd 2938400, rev - r1 270 k ?
2-14 RF2938 rev a8 010418 11 transceivers evaluation board layout board size 2.580? x 2.086? thickness: top to ground laminate, 0.008?; ground to bottom laminate, 0.023?; board material fr-4; multi-layer
2-15 RF2938 rev a8 010418 11 transceivers v in versus p out (v cc =2.7v to 3.6v, i & q in=1mhz, r bw =10k ? ? ? ? , if lo=560mhz@-10dbm) -17.0 -16.0 -15.0 -14.0 -13.0 -12.0 -11.0 -10.0 -9.0 -8.0 -7.0 -6.0 -5.0 -4.0 -3.0 100.0 200.0 300.0 400.0 500.0 600.0 700.0 800.0 v in (mv p-p ) p out (dbm) pout, -40c pout, 25c pout, 85c v in versus amplitude error (v cc =2.7v to 3.6v, i & q in=1mhz, r bw =10k ? ? ? ? , if lo=560mhz@-10dbm) 0.00 0.10 0.20 0.30 0.40 0.50 0.60 0 100 200 300 400 500 600 700 800 v in (mv p-p ) amplitude error (db) ampl err, -40c ampl err, 25c ampl err, 85c tx if p out versus if lo (v cc =3.15v, i & q in=1mhz@100mv p-p ,r bw =10k ? ? ? ? , if lo=560mhz) -16.4 -16.2 -16.0 -15.8 -15.6 -15.4 -15.2 -15.0 -14.8 -14.6 -14.4 -25.0 -20.0 -15.0 -10.0 -5.0 0.0 if lo (dbm) tx if p out (dbm) pout, -40c pout, 25c pout, 85c lo & 2lo out versus if lo (v cc =3.15v, if lo=560mhz) -62.0 -60.0 -58.0 -56.0 -54.0 -52.0 -50.0 -48.0 -46.0 -44.0 -42.0 -40.0 -38.0 -36.0 -34.0 -32.0 -30.0 -28.0 -26.0 -24.0 -22.0 -25.0 -20.0 -15.0 -10.0 -5.0 0.0 if lo (dbm) lo out (dbm) lo_out, -40c 2lo_out, -40c lo_out, 25c 2lo_out, 25c lo_out, 85c 2lo_out, 85c rf conversion gain versus rf lo level (v cc =3.15v, tx if in=280mhz@-50dbm, rf lo=2160mhz) 11.0 11.5 12.0 12.5 13.0 13.5 14.0 14.5 15.0 15.5 16.0 16.5 17.0 17.5 18.0 18.5 19.0 19.5 20.0 -20.0 -18.0 -16.0 -14.0 -12.0 -10.0 -8.0 -6.0 -4.0 -2.0 0.0 2.0 4.0 6.0 rf lo (dbm) gain (db) 25c gain 85c gain -40c gain rf lo out &rf2lo out versus rf lo level (v cc =3.15v, vgc=1.5v, tx if in=280mhz@-50dbm, rf lo=2160mhz, 2lo out =4320mhz) -50.0 -45.0 -40.0 -35.0 -30.0 -25.0 -20.0 -15.0 -10.0 -5.0 0.0 -20.0 -18.0 -16.0 -14.0 -12.0 -10.0 -8.0 -6.0 -4.0 -2.0 0.0 2.0 4.0 6.0 rf lo (dbm) lo out (dbm) 25c loout 85c loout -40c loout 25c 2loout 85c 2loout
2-16 RF2938 rev a8 010418 11 transceivers rf conversion gain versus vgc (v cc =2.7v, tx if in=280mhz-50dbm, rf lo=2160mhz@-10dbm) 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0 16.0 17.0 18.0 19.0 20.0 21.0 22.0 23.0 24.0 25.0 26.0 27.0 28.0 29.0 30.0 31.0 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 2.4 2.5 vgc (vdc) gain (db) 25c gain 85c gain -40c rf conversion gain versus vgc (v cc =3.15v, tx if in=280mhz@-50dbm, rf lo=2160mhz @-10dbm) 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0 16.0 17.0 18.0 19.0 20.0 21.0 22.0 23.0 24.0 25.0 26.0 27.0 28.0 29.0 30.0 31.0 32.0 0.50.60.70.80.91.01.11.21.31.41.51.61.71.81.92.02.12.22.32.42.5 vgc (vdc) gain (db) 25c gain 85c gain - 40c gain rf conversion gain versus vgc (v cc =3.6v, tx if in=280mhz@-50dbm, rf lo=2160mhz@-10dbm) 8.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0 16.0 17.0 18.0 19.0 20.0 21.0 22.0 23.0 24.0 25.0 26.0 27.0 28.0 29.0 30.0 31.0 32.0 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 2.4 2.5 vgc (vdc) gain (db) 25c gain 85c gain -40c gain if-rf iip3 versus vgc (v cc =2.7v, tx if in=12db below ip1db, rf lo=2160mhz@-10dbm) -23.0 -22.0 -21.0 -20.0 -19.0 -18.0 -17.0 -16.0 -15.0 -14.0 -13.0 -12.0 -11.0 -10.0 -9.0 -8.0 -7.0 0.50.60.70.80.91.01.11.21.31.41.51.61.71.81.92.02.12.22.32.42.5 vgc (vdc) iip3 (dbm) 25c iip3 85c iip3 -40c iip3 if-rf iip3 versus vgc (v cc =3.15v, tx if in=12db below ip1db, rf lo=2160mhz@-10dbm) -24.0 -23.0 -22.0 -21.0 -20.0 -19.0 -18.0 -17.0 -16.0 -15.0 -14.0 -13.0 -12.0 -11.0 -10.0 -9.0 -8.0 -7.0 0.50.60.70.80.91.01.11.21.31.41.51.61.71.81.92.02.12.22.32.42.5 vgc (vdc) iip3 (dbm) 25c iip3 85c iip3 -40c iip3 if-rf iip3 versus vgc (v cc =3.6v, tx if in=12db below ip1db, rf lo=2160mhz@-10dbm) -25.0 -24.0 -23.0 -22.0 -21.0 -20.0 -19.0 -18.0 -17.0 -16.0 -15.0 -14.0 -13.0 -12.0 -11.0 -10.0 -9.0 -8.0 -7.0 0.50.60.70.80.91.01.11.21.31.41.51.61.71.81.92.02.12.22.32.42.5 vgc (vdc) iip3 (dbm) 25c iip3 85c iip3 - 40c iip3
2-17 RF2938 rev a8 010418 11 transceivers if-rf op1db versus vgc (v cc =2.7v, tx if in=280mhz, rf lo=2160mhz@-10dbm) -10.5 -10.0 -9.5 -9.0 -8.5 -8.0 -7.5 -7.0 -6.5 -6.0 -5.5 -5.0 -4.5 -4.0 -3.5 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 2.4 2.5 vgc (vdc) op1db (dbm) 25c op1db 85c op1db -40c op1db if-rf op1db versus vgc (v cc =3.15v, tx if in=280mhz, rf lo=2160mhz@-10dbm) -10.5 -10.0 -9.5 -9.0 -8.5 -8.0 -7.5 -7.0 -6.5 -6.0 -5.5 -5.0 -4.5 -4.0 -3.5 0.50.60.70.80.91.01.11.21.31.41.51.61.71.81.92.02.12.22.32.42.5 vgc (vdc) op1db (dbm) 25c op1db 85c op1db -40c op1db if-rf op1db versus vgc (vcc=3.6v, tx if in=280mhz, rf lo=2160mhz@-10dbm) -10.0 -9.5 -9.0 -8.5 -8.0 -7.5 -7.0 -6.5 -6.0 -5.5 -5.0 -4.5 -4.0 -3.5 -3.0 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 2.4 2.5 vgc (vdc) op1db (dbm) 25c op1db 85c op1db -40c op1db i cc versus r bw (temp=ambient, v cc =3.15v, gc tx=1.5v, i & q in=100mv p- p , if lo=-10dbm) 60.0 70.0 80.0 90.0 100.0 110.0 120.0 130.0 140.0 150.0 160.0 170.0 180.0 190.0 200.0 210.0 1.0 10.0 100.0 1000.0 r bw [k ? ] i cc [ma] tx icc rx icc total icc rx 3db bw versus r bw (temp=ambient, v cc =3.15v, v gc = 1.6v, rx if in =-67dbm, if lo=560mhz@-10dbm) 0.0 5.0 10.0 15.0 20.0 25.0 30.0 1.0 10.0 100.0 1000.0 r bw [k ? ] 3 db bw point [mhz] tx 3db bw point versus r bw (broadband 50 ? ? ? ? matchonifout,temp=ambient, v cc =3.15v, gctx=1.5v, i & qin=100mv p-p , iflo=560mhz @-10dbm) 0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0 45.0 50.0 1.0 10.0 100.0 1000.0 r bw [k ? ] 3db bw point [mhz]
2-18 RF2938 rev a8 010418 11 transceivers rx i cc versus v cc (v gc =1.2v to 2.0v, i & q_out=500mv p-p , if lo=560mhz@-10dbm, r bw =100k ?) ?) ?) ?) 59.00 59.50 60.00 60.50 61.00 61.50 62.00 62.50 63.00 63.50 64.00 64.50 65.00 65.50 66.00 66.50 67.00 67.50 68.00 68.50 69.00 69.50 70.00 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6 v cc (vdc) i cc (ma) icc, -40c icc, +25c icc, +85c rx gain versus v gc (v cc =2.7-3.6v, rx if in =280.5mhz, r bw =100k ? ? ? ? , i&q out=500mv p-p , if lo=560mhz@-10dbm) 15.00 20.00 25.00 30.00 35.00 40.00 45.00 50.00 55.00 60.00 65.00 70.00 75.00 80.00 85.00 90.00 95.00 100.00 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 vgc (vdc) gain (db) gain, -40c gain, +25c gain, +85c input p1db versus v gc (temp=ambient, v cc =3.15v, rx if in =280.5mhz, r bw =100k ? ? ? ? , if lo=560mhz@-10dbm) -85.00 -80.00 -75.00 -70.00 -65.00 -60.00 -55.00 -50.00 -45.00 -40.00 -35.00 -30.00 -25.00 -20.00 -15.00 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 v gc [vdc] input p1db [dbm] noise figure versus v gc (temp=ambient, v cc =3.15v, rx if in =291mhz, r bw =5.1k ? ? ? ? , if lo=560mhz@-10dbm) 4.00 6.00 8.00 10.00 12.00 14.00 16.00 18.00 20.00 22.00 24.00 26.00 28.00 30.00 32.00 34.00 36.00 38.00 1.21.31.41.51.61.71.81.92.0 v gc [vdc] noise figure [db] i & q amplitude balance versus v gc (v cc =3.15v, rx if in = 280.5mhz, r bw =100k ? ? ? ? , i & q out=500mv p-p , if lo=560mhz@-10dbm) 0.00 0.50 1.00 1.50 2.00 2.50 3.00 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 v gc (vdc) i & q amplitude error (db) ampl_err, -40c ampl_err, +25c ampl_err, +85c i & q phase balance versus v gc (v cc =2.7-3.6v, rx if in =280.5mhz, r bw =100k ? ? ? ? , i & q out=500mv p-p , if lo=560mhz@-10dbm) 0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 1.21.31.41.51.61.71.81.92.0 v gc (vdc) i&qphaseerror( o ) phase err, -40c phase err, +25c phase err, +85c
2-19 RF2938 rev a8 010418 11 transceivers rssi versus v gc (v cc =3.15v, temp=25 o c, if lo=-10dbm) 0.600 0.700 0.800 0.900 1.000 1.100 1.200 1.300 1.400 1.500 1.600 1.700 1.800 1.900 2.000 2.100 2.200 2.300 2.400 2.500 2.600 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 rf lvl (dbm) rssi (vdc) rssi, vgc= 1.2v rssi, vgc= 1.4v rssi, vgc= 1.6v rssi, vgc= 1.8v rssi, vgc= 2.0v rssi versus v cc (v gc =1.4v, temp=25 o c, if lo=-10dbm) 1.000 1.100 1.200 1.300 1.400 1.500 1.600 1.700 1.800 1.900 2.000 2.100 2.200 2.300 2.400 2.500 2.600 2.700 2.800 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 rf lvl (dbm) rssi (vdc) rssi, vcc= 2.7v rssi, vcc= 3.15v rssi, vcc= 3.6v pa gain versus v cc (pa in=2440mhz@-30dbm) 19.00 19.25 19.50 19.75 20.00 20.25 20.50 20.75 21.00 21.25 21.50 21.75 22.00 22.25 22.50 22.75 23.00 23.25 23.50 23.75 24.00 2.70 3.15 3.60 v cc (v) gain (db) -40c gain 25c gain 85c gain rssi versus temp (v cc =3.15v, vgc=1.4v, if lo=-10dbm) 1.000 1.100 1.200 1.300 1.400 1.500 1.600 1.700 1.800 1.900 2.000 2.100 2.200 2.300 2.400 2.500 2.600 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 rf lvl (dbm) rssi (vdc) rssi, -40c rssi, +25c rssi, +85c pa iip3 versus v cc (pa in=2439 & 2440mhz@13db below ip1db point) 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 3.25 2.70 3.15 3.60 v cc (v) iip3 (dbm) -40c iip3 25c iip3 85c iip3 pa op1db versus v cc (pa in=2440mhz) 12.00 12.25 12.50 12.75 13.00 13.25 13.50 13.75 14.00 14.25 14.50 2.70 3.15 3.60 v cc (v) op1db (dbm) -40c op1db 25c op1db 85c op1db
2-20 RF2938 rev a8 010418 11 transceivers pa 2f0 versus v cc (pa in=2440mhz@-15dbm, 2nd harmonic=4800mhz) 31.25 31.50 31.75 32.00 32.25 32.50 32.75 33.00 33.25 33.50 33.75 34.00 34.25 34.50 34.75 35.00 2.70 3.15 3.60 v cc (v) 2f0 (dbc) -40c 2fo 25c 2fo 85c 2fo

▲Up To Search▲

Price & Availability of RF2938

	To Download RF2938 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .