View RF2926_761891.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

RF2926
11
Typical Applications
* Wireless Meter Reading * Keyless Entry Systems * 433/868/915MHz ISM Band Systems * Wireless Data Transceiver * Wireless Security Systems * Battery Powered Portable Devices
UHF DUAL CONVERSION TRANSCEIVER
Product Description
The RF2926 is a monolithic integrated circuit intended for use as a low cost FM transceiver. The device is provided in 48-lead plastic TQFP packaging and is designed to provide a dual conversion, half-duplex transceiver. The chip is intended for linear (AM, FM) or digital (ASK, FSK, OOK) applications in the North American 915MHz and European 433/868MHz ISM bands. The integrated VCO has a buffered output to feed the RF signal back to the PLL IC to form the frequency synthesizer. Separate RX ENABL, TX ENABL, and PLL ENABL lines allow for half duplex operation as well as turning on the VCO to give the synthesizer time to settle and complete power downmode.
.362 .346 .006 .002 .020 .362 .346 .280 .272 .011 .007 .057 .053
.280 .272 7MAX 0MIN
.031 .021
.007 MAX
Optimum Technology Matching(R) Applied
u
Package Style: LQFP-48
Si BJT Si Bi-CMOS
LVL ADJ PA INP
GaAs HBT SiGe HBT
UP CONV LO+ LO-
GaAs MESFET Si CMOS
Features
* Monolithic Integrated Transceiver * 2.7V to 5.0V Supply Voltage
35 VCO OUT
11
TRANSCEIVERS
46 Gain Control TX OUT RX IN 2 4
44
37
36
39
* Narrow Band and Wide Band FM/FSK * 300MHz to 1000MHz Frequency Range * 130MHz Bandwidth in First IF * 5mW Output Power at 433MHz
34 31 LNA OUT MIX CA MIX IN 8 43 28 10 26 RSSI MIX OUT+ MIX OUT12 13 15 IF1 IN 14 IF1 BP+ 16 IF1 BP18 IF1 OUT 25 RSSI 20 VREF IF 21 IF2 IN 22 IF2 BP+ 23 IF2 BP24 ATA OUT 27 30
MOD IN RESNTRRESNTR+
DEMOD IN FM OUT
DATA REF
Ordering Information
RF2926 RF2926 PCBA UHF Dual Conversion Transceiver Fully Assembled Evaluation Board
Functional Block Diagram
RF Micro Devices, Inc. 7625 Thorndike Road Greensboro, NC 27409, USA
Tel (336) 664 1233 Fax (336) 664 0454 http://www.rfmd.com
Rev A5 010404
11-185
RF2926
Absolute Maximum Ratings Parameter
Supply Voltage Control Voltages Input RF Level Output Load VSWR Operating Ambient Temperature Storage Temperature
Ratings
-0.5 to +5.5 -0.5 to +5.0 +10 50:1 -40 to +85 -40 to +150
Unit
VDC VDC dBm C C 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).
Parameter
Overall
RF Frequency Range
Specification Min. Typ. Max.
300 to 1000 300 to 1000 -18 50 2 Set by loop filter bandwidth +2 20 TBD 200
Unit
MHz MHz dBm MHz dBm dB dB/V kHz Freq=433MHz
Condition
T=25 C, VCC =3.6V, Freq=433MHz
VCO
VCO Frequency Range VCO OUT Level VCO OUT Impedance 50 load impedance
Transmit Section
Max Modulation Frequency Min Modulation Frequency Maximum Power Level Power Control Range Power Control Sensitivity Max FM Deviation
11
TRANSCEIVERS
Antenna Port Impedance Antenna Port Impedance Antenna Port VSWR Modulation Input Impedance Harmonics Spurious
50 TBD 1.5:1 4 -50 TBD 300 to 1000 -99 0.7 to 2.2 25 80 18 7 -18.5 -70 130 34 13 TBD 330 330
See plot Instantaneous frequency deviation is inversely proportional with the modulation voltage TX ENABL="1" TX ENABL="0" TX Mode Measured on eval board with RF filters in system.
k dBm dBc MHz dBm V mV/dB dB dB dB dBm dBm MHz dB dB mVPP
Overall Receive Section
Frequency Range RX Sensitivity RSSI DC Output Range RSSI Sensitivity RSSI Dynamic Range IF BW =400kHz, Freq=915MHz, S/N=8dB RLOAD =51k See plot
70
LNA and Mixer
Cascaded Gain Cascaded Noise Figure Cascaded Input IP3 LO Leakage Freq=915MHz; RX current 12mA Freq=915MHz; RX current 12mA Freq=915MHz; RX current 12mA
First IF Section
IF 3dB Bandwidth Voltage Gain Noise Figure Input IP3 IF1 Input Impedance IF1 Output Impedance IF=110.6MHz, ZL =330
11-186
Rev A5 010404
RF2926
Parameter
Second IF Section
IF Frequency Range Voltage Gain IF2 Input Impedance IF2 Output Impedance Demod Input Impedance FM Output Impedance Data Output Impedance FM Output Bandwidth Data Output Bandwidth Data Output Level 0.1 10.7 60 330 1 10 500 >1 1.6 22 MHz dB k k M MHz MHz V IF=10.7MHz At IF2 OUT pin
Specification Min. Typ. Max.
Unit
Condition
1.4 0.3
VCC -0.3
FM Output DC Level FM Output AC Level
2.6 200 2.0 1.0 25k 3.6 2.7 to 5.0 37.3 10.9 10 to 18 1 3.8
V mVPP V V V V mA mA mA A mA
ZLOAD=1M || 3pF; Output voltage is proportional with the instantaneous frequency deviation. ZLOAD>10k ZLOAD>10k Voltage supplied to the input Voltage supplied to the input
Power Down Control
Logical Controls "ON" Logical Controls "OFF" Control Input Impedance
Power Supply
Voltage Current Consumption Specifications Operating limits TX Mode, LVL ADJ=3.6V TX Mode, LVL ADJ=0V RX Mode; Current is adjustable Power Down Mode PLL Only Mode
11
TRANSCEIVERS
Rev A5 010404
11-187
RF2926
Pin 1 Function TX ENABL Description
Enables the transmitter circuits. TX ENABL>2.0V powers up all transmitter functions. TX ENABL<1.0V turns off all transmitter functions except the PLL functions.
Interface Schematic
20 k TX ENABL 40 k
2
TX OUT
RF output pin for the transmitter electronics. TX OUT output impedance is a low impedance (see output impedance plot in Figure TBD) when the transmitter is enabled. TX OUT is a high impedance when the transmitter is disabled.
20
VCC
TX OUT
3 4
GND2 RX IN
Ground connection for the 40 dB IF limiting amplifier and Tx PA functions. Keep traces physically short and connect immediately to ground plane for best performance. RF input pin for the receiver electronics. RX IN input impedance is a low impedance (see input impedance plot in Figure TBD) when the receiver is enabled. RX IN is a high impedance when the receiver is disabled.
RX IN 500
5 6 7 8
GND1 LNA GND LNA GND LNA OUT
Ground connection for RF receiver functions. Keep traces physically short and connect immediately to ground plane for best performance. Ground connection for the LNA. Ground connection for the LNA. Output pin for the receiver RF low noise amplifier. This pin is an open collector output and requires an external pull up coil to provide bias and tune the LNA output. A capacitor in series with this output can be used to match the LNA to 50 impedance image filters. Same as pin 4. RF input to the RF Mixer. An LC matching network between LNA OUT and MIX IN can be used to connect the LNA output to the RF mixer input in applications where an image filter is not needed or desired. GND5 is the ground connection shared by the input stage of the transmit power amplifier and the receiver RF mixer. Complementary (with respect to pin 13) IF output from the RF mixer. Alternately, an IF tank can be used to tailor the IF frequency and bandwidth to meet the needs of a given application.
VCC LNA OUT
11
TRANSCEIVERS
9 10
GND3 MIX IN
MIX IN GND5
11 12
GND5 MIX OUT+
MIX OUT+
MIX OUT-
15 pF GND5
15 pF GND5
13
MIX OUT-
14 15
IF1 BP+ IF1 IN
IF output from the RF mixer. For a balanced mixer output, pull-up induc- See pin 12. tors from pin 12 and 13 to VCC and a capacitor between the pins should be used. The sum of the total pull-up inductance should be used to resonate the capacitor between pins 12 and 13. DC feedback node for the 40dB limiting amplifier strip. A 10nF bypass See pin 16. capacitor from this pin to ground is required. IF input to the 40dB limiting amplifier strip. A DC blocking capacitor is IF1 BP+ required on this input. The value of this capacitor should be small 60 k enough as to not attenuate the IF frequency when terminated into the 330 input impedance. 330
IF1 IN+
IF1 BP60 k 330
11-188
Rev A5 010404
RF2926
Pin 16 17 18 Function IF1 BPGND7 IF1 OUT Description
See pin 14. Ground connection for 40dB IF limiting amplifier. Keep traces physically short and connect immediately to ground plane for best performance. IF output from the 40dB limiting amplifier. The IF1 OUT output presents a nominal 330 output resistance and interfaces directly to 10.7MHz ceramic filters.
Interface Schematic
See pin 15.
IF1 OUT
19 20 21
GND6 VREF IF IF2 IN
Ground connection for 60dB IF limiting amplifier. Keep traces physically short and connect immediately to ground plane for best performance. DC voltage reference for the IF limiting amplifiers. A 10nF capacitor from this pin to ground is required. IF input to the 60dB limiting amplifier strip. A 10nF DC blocking capacitor is required on this input. The IF2 IN input presents a nominal 330 input resistance and interfaces directly to 10.7MHz ceramic filters.
IF2 IN
IF2 BP+ 60 k 330
IF2 BP60 k 330
22 23 24
IF2 BP+ IF2 BPDATA OUT
DC feedback node for the 60dB limiting amplifier strip. A 10nF bypass capacitor from this pin to ground is required. See pin 21. Demodulated data output from the demodulator. Output levels on this are TTL/CMOS compatible. The magnitude of the load impedance is intended to be 1M or greater.
See pin 20. See pin 20.
DATA OUT
25
RSSI
A DC voltage proportional to the received signal strength is output from this pin. The output voltage range is 0.5V to 2.5V and increases with increasing signal strength.
VCC
RSSI
11
TRANSCEIVERS
26
FM OUT
Linear output from the FM demodulator. This pin is used in analog applications when signal fidelity is important.
FM OUT
27
DATA REF
This pin is used for setting the adaptive Data Slicer DC reference level. A capacitor from this pin to ground can be used to set the reference level at the average DC level of the data bit stream.The DC level determines the bit decision threshold. This pin is the input to the FM demodulator. This pin is NOT AC coupled. Therefore, a DC blocking capacitor is required on this pin to avoid shorting the demodulator input with the LC tank. A ceramic discriminator or DC blocked LC tank resonant at the IF should be connected to this pin.
50 k
DATA REF
28
DEMOD IN
VCC IF Output VCC
10 k DEMOD IN
29
VCC4
This pin is used is supply DC bias to the 60dB IF limiting amplifier. An IF bypass capacitor should be connected directly to this pin and returned to ground. A 10nF capacitor is recommended for 10.7MHz IF applications.
Rev A5 010404
11-189
RF2926
Pin 30 Function RESNTR+ Description
This port is used to supply DC voltage to the VCO as well as to tune the center frequency of the VCO. Equal value inductors should be connected to this pin and pin 31 although a small imbalance can be used to tune in the proper frequency range.
Interface Schematic
RESNTR+ RESNTR-
4 k MOD IN
31 32 33 34
RESNTRVCC2 GND4 MOD IN
See RESNTR+ description.
See pin 30.
35
VCO OUT
This pin is used is supply DC bias to the VCO and buffer amps. A 10nF capacitor is recommended for 10.7MHz IF applications. GND4 is the ground shared on chip by the VCO, prescaler, and PLL electronics. FM analog or digital modulation can be imparted to the VCO through See pin 30. this pin. The VCO varies in accordance to the voltage level presented to this pin. To set the deviation to a desired level, a voltage divider referenced to VCC is the recommended. This deviation is also dependent upon the overall capacitance of the external resonant circuit. This pin is used is supply a buffered VCO output to go to the PLL chip. This pin has a DC bias and needs to be AC coupled.
VCO OUT
36
LO-
Balanced input for the first LO. This signal is presented to both the receiver second downconverter and transmit upconvertor.
LO-
LO+
37 38 39
LO+ GND8 UP CONV GND9 VCC1
Complementary input of LO-. Ground for LO amp and transmit upconvertor. Keep traces physically short and immediately to the ground plane for best performance. The output of the transmit signal upconvertor. This signal should be filtered to remove the undesired sideband and spurs before being applied to the PA input, pin 45. Same as pin 38. This pin is used to supply DC bias to the receiver RF electronics. A RF bypass capacitor should be connected directly to this pin and returned to ground. A 100pF capacitor is recommended for 915MHz applications. A 220pF capacitor is recommended for 433MHz applications. This pin is used to mute the data output (DATA OUT). MUTE>2.0V turns the DATA OUT signal on. MUTE<1.0V turns the DATA OUT signal off. The MUTE signal should be logic low in the Sleep Mode.
See pin 36.
11
TRANSCEIVERS
40 41
See pin 38.
42
MUTE
75 k MUTE 25 k
43
MIX CA
44 45
PA INP VCC3
Mixer Current Adjust. This pin is used to adjust the current in the receiver. A resistor connected to ground controls the bias current in the mixer. The resistor should vary between 1k to open circuit to vary the current from 18mA to 10.6mA Input of the transmit power amplifier. This pin is used to supply DC bias to the transmitter PA. A RF bypass capacitor should be connected directly to this pin and returned to ground. A 100pF capacitor is recommended for 915MHz applications. A 220pF capacitor is recommended for 433MHz applications.
11-190
Rev A5 010404
RF2926
Pin 46 Function LVL ADJ Description
This pin is used to vary the transmitter output power. An output level adjustment range greater than 12dB is provided through analog voltage control of this pin. DC current of the transmitter power amp is also reduced with output power. This pin MUST be low when the transmitter is disabled.
400
Interface Schematic
40 k LVL ADJ
4 k
47
PLL ENABL
This pin is used to power up or down the VCO and PLL. A logic high (PLL ENABL>2.0V) powers up the VCO and PLL electronics. A logic low (PLL ENABL<1.0V) powers down the PLL and VCO.
50 k PLL ENABL
48
RX ENABL
Enable pin for the receiver circuits. RX ENABL>2.0V powers up all receiver functions. RX ENABL<1.0V turns off all receiver functions except the PLL functions and the RF mixer.
50 k RX ENABL
Pin Out
PLL ENABL RX ENABL PA INPUT UP CONV LVL ADJ MIX CA
MUTE
GND9
GND8 38
VCC3
VCC1
48 TX ENABL 1 TX OUT 2 GND2 3 RX IN 4 GND1 5 LNA GND 6 LNA GND 7 LNA OUT 8 GND3 9 MIX IN 10 GND5 11 MIX OUT+ 12 13 MIX OUT-
47
46 Gain Control
45
44
43
42
41
40
39
37 36 LO35 VCO OUT 34 MODIN 33 GND4 32 VCC2 31 RESNTR30 RESNTR+ 29 VCC4 28 DEMOD IN
LO+
11
TRANSCEIVERS
RSSI
27 DATA REF 26 FM OUT 25 RSSI
14 IF1 BP+
15 IF1 IN
16 IF1 BP-
17 GND7
18 IF1 OUT
19 GND6
20 VREF IF
21 IF2 IN
22 IF2 BP+
23 IF2 BP-
24 DATA OUT
Rev A5 010404
11-191
11
TRANSCEIVERS
11-192
RF2926
10 22 pF Filter 22 pF 0.1 F 22 pF 22 pF 10 k 48 1 36 35 34 33 32 4.7 nH 6 31 30 D1 220 pF 9 22 pF 10 2 pF 11 12 10 0.1 F 22 pF 390 nH 5 pF Filter 47 k 2.7 k Filter DATA OUT 10 pF RSSI 22 nF 22 nF 22 nF 5 pF 560 nH 13 14 15 16 17 18 19 20 21 22 nF 22 23 24 22 nF FM OUT 26
FM Disc.
VCC
MUTE
0.1 F
VCC LO INPUT 51 1 nF 1 nF 41 40 39 38 37 VCO OUT MOD IN
LVL ADJ PLL ENABL RX ENABL 47 Gain Control 46 45 44 43 42
TX ENABL 22 pF 2 8.2 nH 3 4 pF 4 5 2 pF 10 k 22 pF 4 pF 22 pF 0.1 F 10
RF
VCC
10 VCC 22 pF 0.1 F
VCC 18 nH 8 29 28 RSSI 27 7
10 22 pF 6 pF
LOOP FILTER 4.7 nH 10 VCC 5 pF 1.5 k 10 nF 22 pF 0.1 F
0.1 F
LNA OUT
Filter
18 nH 5 pF
Application Schematic 915MHz
MIX IN
25
VCC
MIX OUT
Rev A5 010404
RF2926
Evaluation Board Layout Board Size 3.04" x 3.04"
Board Thickness 0.031", Board Material FR-4
11
TRANSCEIVERS
Rev A5 010404
11-193
RF2926
11
TRANSCEIVERS
11-194
Rev A5 010404

▲Up To Search▲

Price & Availability of RF2926

	To Download RF2926 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .