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19-1807; Rev 1; 3/01
KIT ATION EVALU E AILABL AV
Triple/Dual-Mode CDMA LNA/Mixers
Features
o 1.4dB LNA Noise Figure o 15dB LNA Gain o Mixer Noise Figure 7.5dB (CDMA) 8.7dB (AMPS) o Mixer Gain 14.5dB PCS 13.3dB Cellular 8.8dB AMPS o LO Frequency Divider, Saves VCO Module o LO Output Buffers for TX o Ultra-Small 28-Pin Leadless Package
General Description
The MAX2338 receiver RF front-end IC is designed for dual-band CDMA cellular phones and can also be used in dual-band TDMA, GSM, or EDGE cellular phones. Thanks to the MAX2338's on-chip low-power LO divider, the cellular VCO module can be eliminated. The MAX2338 includes a low-noise amplifier (LNA) with an adjustable high-input third-order intercept point (IIP3) to minimize intermodulation and cross-modulation in the presence of large interfering signals. For cellular band operation, a low-gain LNA is available for higher cascaded IIP3 at lower current. The CDMA mixers are designed for high linearity, low noise, and differential IF outputs. The FM mixer is designed for lower current and single-ended output. The MAX2338 triple-mode LNA/mixer includes an onchip LO frequency divider to allow the use of a single VCO for both bands. This device is available in an ultrasmall 28-pin leadless QFN package.
MAX2338
Ordering Information ________________________Applications
Dual-Band, Triple-Mode PCS/Cellular Phones Dual-Mode Cellular Phones
PART MAX2338EGI TEMP RANGE -40C to +85C PIN-PACKAGE 28 QFN
Pin Configuration/ Functional Diagram
CLNAOUT CMIXIN 22 PMIXIN 23
TOP VIEW
PLNAOUT
Typical Operating Circuit appears at end of data sheet.
GND
GND 25
28
27
26
RLNA 1 PLNAIN 2 GND 3 CLNAIN 4 BAND 5 LIN 6 GAIN 7
GND 24
21 RBIAS 20 IF+ 19 IF18 GND
MAX2338
/2
17 BUFFEN 16 VCC 15 FMOUT
8 GND
9 LO/2
10 LOIN
11 GND
12 PLOOUT
13 CLOOUT
14 N.C.
QFN
________________________________________________________________ Maxim Integrated Products
1
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Triple/Dual-Mode CDMA LNA/Mixers MAX2338
ABSOLUTE MAXIMUM RATINGS
VCC to GND..........................................................+0.3V to +4.3V Digital Input Voltage to GND ......................-0.3V to (VCC + 0.3V) LNA Input Level...............................................................1V peak LO, Mixer Input Levels .....................................................+5dBm Digital Input Current .........................................................10mA Continuous Power Dissipation (TA = +70C) 28-Pin QFN (derate 28.5mW/C above TA = +70C).........2W Operating Temperature Range ...........................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) ................................ +300C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS
(VCC = +2.7V to +3.3V, RRBIAS = RRLNA = 24k, BUFFEN = LOW, all RF and IF outputs connected to VCC, no RF applied, TA = -40C to +85C. Typical values are at +3.0V and TA = +25C, unless otherwise noted. Refer to Operational Modes table for control logic.)
PARAMETER PCS CDMA MODES Operating Supply Current CELLULAR CDMA MODE Low-gain mode Operating Supply Current FM MODE Operating Supply Current SHUTDOWN MODE Shutdown Supply Current ALL MODES LO Buffer Supply Current Additional Operational Current Divider Active Digital Input Logic High Digital Input Logic Low Digital Input High Current Digital Input Low Current -25 BUFFEN = HIGH LO/2 = LOW LO/2 = HIGH 7.2 10.3 1.2 2.0 0.6 5 9.5 mA mA V V A A 0.1 5 A 13.5 17 mA High-gain, low-linearity mode High-gain, high-linearity mode 19.5 18 28 25 24 35 mA High-gain, low-linearity mode High-gain, high-linearity mode 18 25 24 33 mA CONDITIONS MIN TYP MAX UNITS
Cellular and FM mode; LO/2 = HIGH
2
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Triple/Dual-Mode CDMA LNA/Mixers
AC ELECTRICAL CHARACTERISTICS
(MAX2338 EV kit, VCC = +2.7V to +3.3V, fPLNAIN = fPMIXIN = 1930MHz to 1990MHz, fCLNAIN = fCMIXIN = 869MHz to 894MHz, fIF = 183MHz, high side LO, LO/2 = LOW. All ports matched to 50, RRLNA = RRBIAS = 24k, TA = -40C to +85C. Typical values are at TA = +25C, VCC = +3.0V, unless otherwise noted.)
PARAMETER OVERALL PERFORMANCE Low-Band RF Frequency Range High-Band RF Frequency Range Low-Band LO Frequency Range High-Band LO Frequency Range IF Frequency Range LO Input Level CELLULAR LNA PERFORMANCE HIGH-GAIN, HIGH-LINEARITY MODES Gain (Note 2) Noise Figure (Note 3) Noise Figure Change Due to Temperature IIP3 (Notes 3, 4) CDMA HIGH-GAIN, LOW-LINEARITY MODE AND FM MODE Gain (Note 2) Noise Figure (Note 3) IIP3 (Note 3, 4) CDMA LOW-GAIN MODE Gain (Note 2) Noise Figure (Note 3) IIP3 (Notes 3, 4) PCS LNA PERFORMANCE CDMA HIGH-GAIN, HIGH-LINEARITY MODE Gain (Note 2) Noise Figure (Note 3) Noise Figure Change Due to Temperature IIP3 (Notes 3, 5) CDMA HIGH-GAIN, LOW-LINEARITY MODE Gain (Note 2) Noise Figure (Note 3) IIP3 (Notes 3, 5) CELLULAR MIXER PERFORMANCE CDMA HIGH-GAIN, HIGH-LINEARITY, AND LOW-GAIN MODES Gain (Note 2) Noise Figure (Note 3) IIP3 (Note 4) TA = +25C 3.0 10.3 13.3 7.8 5.5 16.4 9.0 dB dB dBm TA = +25C 2.5 13.0 14.5 1.4 7.5 16.5 1.7 dB dB dBm TA = +25C TA = +25C to TMAX 5.0 13.8 15.3 1.4 0.3 7.7 16.9 1.7 dB dB dB dBm 15 -4.0 -2.3 5 18 0 6 dBm dB dBm TA = +25C 2.5 13 14.7 1.4 5.5 16.5 1.7 dB dB dBm TA = +25C TA = +25C to TMAX 9.5 14.0 15.7 1.4 0.3 12 17.0 1.6 dB dB dB dBm After divider if active (Note 1) (Note 1) (Note 1) 869 1930 950 1750 80 -7 -3 894 1990 1100 2210 220 0 MHz MHz MHz MHz MHz dBm CONDITIONS MIN TYP MAX UNITS
MAX2338
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Triple/Dual-Mode CDMA LNA/Mixers MAX2338
AC ELECTRICAL CHARACTERISTICS (continued)
(MAX2338 EV kit, VCC = +2.7V to +3.3V, fPLNAIN = fPMIXIN = 1930MHz to 1990MHz, fCLNAIN = fCMIXIN = 869MHz to 894MHz, fIF = 183MHz, high side LO, LO/2 = LOW. All ports matched to 50, RRLNA = RRBIAS = 24k, TA = -40C to +85C. Typical values are at TA = +25C, VCC = +3.0V, unless otherwise noted.)
PARAMETER HIGH-GAIN, LOW-LINEARITY IDLE MODE Gain (Note 2) Noise Figure (Note 3) IIP3 (Notes 3, 4) FM MODE Gain (Note 2) Noise Figure (Note 3) IIP3 (Note 4) PCS MIXER PERFORMANCE CDMA HIGH-GAIN, HIGH-LINEARITY MODE Gain (Note 2) Noise Figure (Note 3) IIP3 (Notes 3, 5) HIGH-GAIN, LOW-LINEARITY MODE Gain (Note 2) Noise Figure (Note 3) IIP3 (Note 5) ALL MODES Mixer Output 1dB Compression 4 x 5 Suppression (Note 6) 2 x 2 Input Intercept Point (Notes 3, 7) LO Output Level (Note 3) LO Output Leakage LO Emission at PCS LNA Input Port LO Emission at Cellular LNA Input Port LO Output Harmonic Suppression LO Output Noise Power RF Ports Return Loss BUFFEN = HIGH BUFFEN = HIGH PCS band, 80MHz below LO Cellular band, 45MHz below LO Into 50 or 100 load, BUFFEN = HIGH BUFFEN = LOW 25 -12 -1 >45 33 -6 -35 -55 -55 -15 -161 -161 10 dBm dB dBm dBm dBm dBm dBm dBc dBm/Hz dB TA = +25C 0.5 11.2 14 7.2 2.5 16.2 9.0 dB dB dBm TA = +25C 3.5 11.7 14.5 7.8 7.5 17 9.0 dB dB dBm TA = +25C 1.4 6.0 8.8 8.7 3.4 11.1 11.0 dB dB dBm TA = +25C 1.4 10.1 13 7.3 3.5 16 9.0 dB dB dBm CONDITIONS MIN TYP MAX UNITS
All active RF ports including 2-element matching
Note 1: Note 2: Note 3: Note 4: Note 5: Note 6:
Operation over this frequency range may require the ports to be rematched for the desired operating frequency. MIN guaranteed by production test, MAX guaranteed by design and characterization. Guaranteed by design and device characterization. Two-tone IIP3. Tested at fRF1 = 880MHz, fRF2 = 880.9MHz, and power = -25dBm/tone. Two-tone IIP3. Tested at fRF1 = 1960MHz, fRF2 = 1961.25MHz, and power = -25dBm/tone. FLO = 1064MHZ, fRF1 = 887.8MHz at -30dBm, fRF2 = 881MHz at -100dBm. Performance is measured as PIF due to RF1 - PIF due to RF2. Note 7: FLO = 2143MHz, fRF1 = 2051.5MHz at -35dBm, fRF2 = 1960MHz at -100dBm. Performance is measured as PIF due to RF1 - PIF due to RF2.
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Triple/Dual-Mode CDMA LNA/Mixers MAX2338
Typical Operating Characteristics
(TA = +25C, unless otherwise noted.)
PCS-BAND HGHL LNA GAIN vs. CURRENT
MAX2338 toc02
PCS-BAND SUPPLY CURRENT
MAX2338 toc01
CELLULAR-BAND SUPPLY CURRENT
30 HGHL 25 SUPPLY CURRENT (mA) 20 15 10 5 0 HGLL FM 12 11 10 -50 0 50 100 4 LGHL GAIN (dB) 17 16 15 14
HGHL 25 SUPPLY CURRENT (mA) 20 15 10 5 0 -50 0 50 HGLL
TA = -40C
TA = +25C 13
TA = +85C
100
6
8
10
12
14
16
TEMPERATURE (C)
TEMPERATURE (C)
LNA CURRENT (mA)
CELLULAR-BAND HGHL LNA GAIN vs. CURRENT
MAX2338 toc04
CELLULAR-BAND LNA GAIN vs. FREQUENCY
MAX2338 toc05
PCS-BAND LNA GAIN vs. FREQUENCY
16 15 14 GAIN (dB) 13 12 11 10 HGLL HGHL
MAX2338 toc06
18 TA = -40C 17 16 GAIN (dB) 15 14 13 12 4 6 8 10 12 14 16 18 TA = +25C TA = +85C
20 HGHL 15 HGLL, FM GAIN (dB) 10
17
5
0
LGHL
9 8
-5 20 850 860 870 880 890 900 LNA CURRENT (mA) FREQUENCY (MHz)
7 1900 1920 1940 1960 1980 2000 FREQUENCY (MHz)
PCS-BAND HGHL LNA IIP3 vs. CURRENT
MAX2338 toc07
CELLULAR-BAND HGHL LNA IIP3 vs. CURRENT
TA = -40C TA = +25C
MAX2338 toc08
PCS-BAND HGHL LNA NOISE FIGURE vs. FREQUENCY
1.9 1.8 NOISE FIGURE (dB)
MAX2338 toc09
10 9 8 IIP3 (dBm) TA = +25C 6 5 4 3 2 4 5 6 7 8 9 LNA CURRENT (mA) TA = +85C TA = -40C
14 12 10 IIP3 (dBm) 8 6 4 2 4 6 8 10 12
2.0
7
TA = +85C
1.7 1.6 1.5 1.4 1.3 1.2 1900 1920 1940
4mA 8.4mA
15mA
14
16
1960
1980
2000
LNA CURRENT (mA)
FREQUENCY (MHz)
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MAX2338 toc03
30
5
Triple/Dual-Mode CDMA LNA/Mixers MAX2338
Typical Operating Characteristics (continued)
(TA = +25C, unless otherwise noted.)
CELLULAR-BAND HGHL LNA NOISE FIGURE vs. FREQUENCY
MAX2338 toc10
CELLULAR-BAND HGHL MIXER CONVERSION GAIN vs. CURRENT
MAX2338 toc11
PCS-BAND MIXER CONVERSION GAIN vs. CURRENT
15 14 CONVERSION GAIN (dB) 13 12 11 10 9 8 7 TA = -40C, LOW SIDE LO TA = +25C, HIGH SIDE LO TA = +25C, LOW SIDE LO TA = +85C, HIGH SIDE LO TA = +85C, LOW SIDE LO 4 6 8 10 12 14 TA = -40C, HIGH SIDE LO
MAX2338 toc12
2.0 1.8 1.6 NOISE FIGURE (dB) 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 840 850 860 870 880 890 16mA 11mA 6mA
18 16 CONVERSION GAIN (dB) 14 12
16
TA = -40C
TA = +25C 10 8 6 TA = +85C
6 4 6 8 10 12 14 MIXER CURRENT (mA) MIXER CURRENT (A)
900
FREQUENCY (MHz)
CELLULAR-BAND MIXER CONVERSION GAIN vs. LO INPUT LEVEL
MAX2338 toc13
PCS-BAND MIXER CONVERSION GAIN vs. LO INPUT LEVEL
MAX2338 toc14
CELLULAR-BAND MIXER CONVERSION GAIN vs. RF INPUT LEVEL
MAX2338 toc15
14 HGHL 13 HGLL GAIN (dB)
16 15 14 GAIN (dB) 13 12 HIGH SIDE LO HGHL
14 13 12 GAIN (dB) 11 10 9 8
LOW SIDE LO HGHL
12
11 11 10 -20 -15 -10 -5 0 5 LO INPUT LEVEL (dBm) 10 -20 -15 -10 -5 0 5 LO INPUT LEVEL (dBm)
-20
-18
-16
-14
-12
-10
-8
-6
RF INPUT LEVEL (dBm)
PCS-BAND MIXER CONVERSION GAIN vs. RF INPUT LEVEL
MAX2338 toc16
CELLULAR-BAND HGHL MIXER IIP3 vs. CURRENT
MAX2338 toc17
PCS-BAND HGHL MIXER IIP3 vs. CURRENT
8 6 4 HIGH SIDE LO, TA = +85C HIGH SIDE LO, TA = +25C
MAX2338 toc18
18
8 TA = +85C 6 4
16
HIGH SIDE LO HGHL
GAIN (dB)
IIP3 (dB)
LOW SIDE LO HGHL 12
2 0 -2
TA = +25C
IIP3 (dB)
14
2 0 -2
10 -4 8 -20 -18 -16 -14 -12 -10 -8 -6 RF INPUT LEVEL (dBm) -6 4 6
TA = -40C
-4 -6
HIGH SIDE LO, TA = -40C
8
10
12
14
4
6
8 MIXER CURRENT (mA)
10
12
MIXER CURRENT (mA)
6
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Triple/Dual-Mode CDMA LNA/Mixers MAX2338
Typical Operating Characteristics (continued)
(TA = +25C, unless otherwise noted.)
CELLULAR-BAND MIXER NOISE FIGURE vs. RF FREQUENCY
MAX2338 toc19
PCS-BAND MIXER NOISE FIGURE vs. RF FREQUENCY
HGHL LOW SIDE LO 8.5 8.0 NOISE FIGURE (dB) 7.5 HGHL HIGH SIDE LO 7.0 6.5 6.0 5.5 5.0 HGLL HIGH SIDE LO HGLL LOW SIDE LO
MAX2338 toc20
9.0 8.5 8.0 NOISE FIGURE (dB) 7.5 7.0 6.5 6.0 5.5 5.0 850 860 870 880 890 HGLL FM HGHL
9.0
900
1920
1940
1960
1980
2000
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
CELLULAR-BAND LO BUFFER OUTPUT LEVEL vs. INPUT LEVEL
MAX2338 toc21
CDMA MIXER IF PORT DIFFERENTIAL PORT IMPEDANCE
MAX2338 toc22
0 LO / 2 OUTPUT LEVEL (dBm) -10
75 CAPACITANCE
2.0
PARALLEL RESISTANCE (k)
45
1.2
-20
2 X LO / 2
30 RESISTANCE
0.8
-30
3 X LO / 2
15
0.4
-40 -15 -10 -5 0 5 LO INPUT LEVEL (dBm)
0 0 100 200 300 400 500 RF FREQUENCY (MHz)
0
FM MIXER IF PORT DIFFERENTIAL PORT IMPEDANCE
MAX2338 toc23
PCS-BAND LO BUFFER OUTPUT LEVEL vs. INPUT LEVEL
-10 PARALLEL RESISTANCE (k) OUTPUT LEVEL (dBm) -20 -30 -40 3 X LO -50 -60 -70 2 X LO LO
MAX2338 toc24
60 50 40 CAPACITANCE 30 20 10 0 0 100 200 300 400 RESISTANCE
3.0 2.5 2.0 1.5 1.0 0.5 0
0
PARALLEL RESISTANCE (k)
500
-80 -15 -10 -5 0 5 LO INPUT LEVEL (dBm)
RF FREQUENCY (MHz)
_______________________________________________________________________________________
PARALLEL RESISTANCE (k)
60
1.6
7
Triple/Dual-Mode CDMA LNA/Mixers MAX2338
Pin Description
PIN 1 2 3, 8, 11, 18, 24, 25, 27, Exposed Paddle 4 5 6 7 9 10 12 NAME RLNA PLNAIN FUNCTION LNA Bias-Setting Resistor Connection. For nominal bias, connect a 24k resistor to ground. The value of this resistor sets the bias current for HGHL LNAs. High-Band RF Input. Requires a blocking capacitor which may be used as part of the input matching network. Ground Reference for RF, DC and Logic Inputs. Solder the exposed paddle evenly to the circuit board ground plane. Low-Band RF Input. Requires a blocking capacitor which may be used as part of the input matching network. Band-Select Logic Input. LOW selects high-band (PCS), HIGH selects low-band (cellular). Linearity-Select Logic Input. See Detailed Description for control modes. Gain-Select Logic Input. See Detailed Description for control modes. LO Divider-Select Input. LOW disables LO divider, HIGH selects divider in cellular and FM modes. See Detailed Description for control modes. LO Input Port. Requires an external DC blocking capacitor. PCS LO Buffer Output Port. Internally matched to 100 (nominal). Does not require a blocking capacitor. Cell LO Buffer Output Port. Internally matched to 100 (nominal). Does not require a blocking capacitor. The output frequency is one half LOIN when LO/2 is floating or HIGH, and equal to LOIN when LO/2 is LOW. No Connection FM Mixer Output Port. Requires pullup inductor and DC blocking capacitor, which may be used as part of the output matching network. Power Supply Pin. Bypass with capacitor as close to the pin as possible. LO Output Buffer Enable. Drive BUFFEN HIGH to power up the LO output buffer associated with the selected band. Mixer Differential Outputs. Require pullup inductors and series capacitors which can be used as part of the output matching network. Bias Setting Resistor Connection. For nominal bias, connect a 24k resistor to ground. The value of this resistor sets current for all blocks except HGHL LNA. Low-Band Mixer Input. Requires a blocking capacitor which may be used as part of the input matching network. High-Band Mixer Input. Requires a blocking capacitor which may be used as part of the input matching network. High-Band LNA Output Port. Connect a pullup inductor to VCC and an external series blocking capacitor which may be used as a part of the output matching network. Low-Band LNA Output Port. Connect a pullup inductor to VCC and an external series blocking capacitor which may be used as a part of the output matching network.
GND
CLNAIN BAND LIN GAIN LO/2 LOIN PLOOUT
13 14 15 16 17 19, 20 21 22 23 26 28
CLOOUT NC FMOUT VCC BUFFEN IF-, IF+ RBIAS CMIXIN PMIXIN PLNAOUT CLNAOUT
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Triple/Dual-Mode CDMA LNA/Mixers
Detailed Description
The MAX2338 consists of cellular band and PCS band (LNAs) and mixers. The IC also consists of a local oscillator (LO) divider and LO buffers for cellular and PCS bands. FM band mixer has its own IF output to feed to a different filter. When the linearity requirement is high, the LIN control input increases the current in the downconverter. The downconverter requires a DC blocking capacitor at the input and output, and a pullup inductor at the output. The DC blocking capacitors can be designed to be part of the matching circuits. The table in the Operational Modes section shows the settings for BAND, GAIN, and LIN for various operating modes.
MAX2338
Low-Noise Amplifiers
The MAX2338 LNAs' gain and linearity are switched by the GAIN and LIN input, respectively. The PCS band LNA has two operational modes: high-gain high-linearity (HGHL) and high-gain low-linearity (HGLL). The cellular band LNA has three operational in modes: HGHL, HGLL, and low-gain high-linearity (LGHL) modes. The table in the Operational Modes section shows the pin settings for BAND, GAIN, and LIN for various operating modes. Use HGHL mode when extra high linearity is required for cross-modulation suppression, HGLL mode when the transmitter is off and cross-modulation is not a concern, and LGHL mode when receiving large signals.
LO Output Buffers
There are two LO output buffers: cellular and PCS. The inputs are tied together and internally matched to 50. The outputs of the PCS and cellular buffers are brought out separately. The outputs of the buffers are internally matched and include a DC blocking capacitor.
LO Divider
The MAX2338 includes an LO divider circuit which enables a single VCO for both cellular and PCS bands. The LO/2 logic input turns the divider on or off in the cellular band.
Downconverter
The downconverters in these devices are double balanced mixers. The PCS band mixer and digital cellular band mixer share the same IF output ports. The cellular
Table 1. Operational Modes
FUNCTION CDMA HL Mixer CDMA LL Mixer CONTROL PIN
BAND (H/L)
HGHL Amp
LGHL Amp
HGLL Amp
MODES
FM Mixer
BAND
LOX1
LO /2
GAIN
PCS Band, High-Gain, High-Linearity (HGHL) PCS Band, High-Gain, Low-Linearty (Idle Mode) (HGLL) Undefined Cellular Band CDMA, High-Gain, High-Linearity (HGHL) Cellular Band CDMA, High-Gain, Low-Linearity (Idle Mode) (HGLL) Cellular Band, CDMA, Low-Gain Cellular Band, FM Mode Cellular Band CDMA, High-Gain, High-Linearity (HGHL) Cellular Band CDMA, High-Gain, Low-Linearity (Idle Mode) (HGLL) Cellular Band, CDMA, Low-Gain Cellular Band, FM Mode Shutdown
H H -- L L L L L L L L
-- --
-- -- --
-- -- --
0 0 0 1 1 1 1 1 1 1 1 0
1 1 0 1 1 0 0 1 1 0 0 0
1 0 1 1 0 1 0 1 0 1 0 0
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LO/2 X X X 1 1 1 1 0 0 0 0 X
LIN
9
Triple/Dual-Mode CDMA LNA/Mixers MAX2338
Operational Modes
The various operating modes are controlled by the logic inputs BAND, GAIN, LIN, and LO/2. Table 1 shows the pin settings for the various operating modes. mize the noise contribution of the mixer, thus increasing the receiver's sensitivity, and the LNA has high linearity for cross-modulation suppression. The HGLL mode is used when the transmitter is off and cross-modulation is not a concern. In LGHL mode, the received signal is strong enough that linearity is the primary concern. The LNA gain is reduced for higher system linearity.
Applications Information
Cascaded LNA/Mixer Performance
The LNA and mixer design optimizes cascaded performance in all gain and linearity modes. In HGHL mode both the LNA and mixer have a low noise figure, high gain, and high linearity. The LNA has high gain to mini-
S-Parameters
Use the S-parameters listed in the following tables to design the RF matching circuits.
Table 2. MAX2338 Cellular Band LNA S-parameters High-Gain, High-Linearity Mode
FREQUENCY (MHz) 30 50 100 150 200 300 400 500 600 700 800 810 820 830 840 850 860 870 880 890 900 1000 1250 1500 1750 2000 2500 3000 3500 4000
|S11|
0.905 0.899 0.891 0.884 0.874 0.85 0.818 0.785 0.75 0.714 0.683 0.681 0.677 0.675 0.670 0.668 0.665 0.661 0.660 0.660 0.653 0.614 0.547 0.457 0.310 0.320 0.300 0.310 0.360 0.360
S11 -5.4 -8.1 -15.1 -21.8 -28.2 -41.6 -52.5 -63.5 -71.6 -79.8 -76.5 -77.0 -77.0 -78.0 -78.3 -78.8 -79.0 -79.5 -80.0 -80.4 -81.0 -97.0 -111 -131 -164 166 141 122 86 10
|S21|
0.145 0.467 1.34 2.2 2.83 3.77 4.24 4.44 4.38 4.16 4.03 4.01 3.99 3.97 3.96 3.93 3.92 3.91 3.89 3.87 3.86 3.59 3.15 2.93 2.48 2.1 1.62 1.29 1.18 1.14
S21 -38 -57 -86 -108 -127 -157.5 178.3 155.4 140 125 112.6 111.2 110.0 108.5 107.2 106.4 104.7 103.4 102.1 100.8 99.3 86.2 60.8 34 18 -40 -41 -66 -88 -112
|S12|
0.002 0.003 0.012 0.023 0.027 0.029 0.030 0.036 0.040 0.048 0.059 0.060 0.061 0.061 0.062 0.063 0.063 0.063 0.063 0.063 0.063 0.07 0.09 0.109 0.14 0.185 0.19 0.19 0.2 0.2
S12 -55 -126 -174 176 165.8 137 127 112 98 90 83.0 82.8 82.0 80.9 80.6 79.2 78.1 77.2 76.5 75.4 73.5 20 -13.2 -36 -62 -98 -150 136 90 43
|S22|
0.98 0.94 0.96 0.96 0.95 0.93 0.90 0.94 0.87 0.84 0.793 0.798 0.800 0.799 0.792 0.782 0.769 0.753 0.733 0.710 0.690 0.680 0.650 0.610 0.580 0.490 0.360 0.41 0.500 0.480
S22 -47 -72 -117 -144 -162 -172 155 129 100 78 67.5 66.5 65.7 65.0 64.2 63.4 62.7 61.8 60.6 59.4 57.7 51.8 37 15.9 -9.6 -33 -70 -64 -61 -50
10
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Triple/Dual-Mode CDMA LNA/Mixers MAX2338
Layout Considerations
Keep RF signal lines as short as possible to minimize losses and radiation. Use high Q components for the LNA input-matching circuit to achieve the lowest possible noise figure. At the digital mixer outputs, keep the differential signal lines together and of equal length to ensure signal balance. For best gain and noise performance, solder the exposed paddle evenly to the board ground plane.
Table 3. MAX2338 PCS Band LNA S-Parameters High-Gain, High-Linearity Mode
FREQUENCY (MHz) 30 50 100 200 300 400 600 800 1000 1200 1500 1750 1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 2250 2500 3000 4000
|S11|
0.890 0.883 0.872 0.841 0.799 0.778 0.750 0.706 0.676 0.659 0.634 0.578 0.560 0.558 0.554 0.551 0.547 0.543 0.538 0.536 0.533 0.530 0.523 0.347 0.298 0.273 0.245
S11 -4.9 -7.2 -13.2 -25 -35 -41 -62 -75 -85 -94 -108 -110 -90.8 -91.0 -91.4 -91.7 -92.2 -92.2 -92.4 -92.5 -92.9 -93.0 -93.4 -155 -158 -160 -170
|S21|
0.002 0.001 0.391 0.882 1.42 2.1 2.15 2.2 2.45 2.59 3.03 3.58 3.64 3.64 3.64 3.63 3.63 3.63 3.63 3.61 3.60 3.59 3.57 2.88 2.71 2.64 2.03
S21 -95 -60 -81 -112 -131 -153 -172 162 150 142 134 126 120.6 119.6 118.9 118.2 117.7 117.0 116.5 115.9 115.2 114.7 113.0 131 172 -165 -145
|S12| 0.001 0.001 0.002 0.007 0.010 0.02 0.02 0.025 0.029 0.032 0.036 0.038 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.05 0.05 0.06 0.067
S12 -112 -121 -178 171 150 125 100 80 65 42 31 19 11.8 9.06 8.8 6.7 5.3 4.87 4.1 1.8 1.5 0 -2.1 -32 -72 -94 -120
|S22|
0.996 0.990 0.980 0.970 0.959 0.947 0.943 0.944 0.919 0.879 0.824 0.780 0.740 0.738 0.733 0.729 0.725 0.720 0.716 0.716 0.711 0.707 0.702 0.518 0.489 0.473 0.425
S22 -48 -73 -114 -150 -166 -173 173 151 133 115 94.4 81 61.7 60.7 59.6 58.5 57.4 56.1 55.0 53.6 52.3 50.9 49.5 24 5 -18 -30
______________________________________________________________________________________
11
Triple/Dual-Mode CDMA LNA/Mixers MAX2338
Table 4. MAX2338 Cellular Band Mixer Input S-Parameters High-Gain, HighLinearity Mode
FREQUENCY (MHz) 800 810 820 830 840 850 860 870 880 890 900
Table 5. MAX2338 PCS Band Mixer Input S-Parameters High-Gain, High-Linearity Mode
FREQUENCY (MHz) 1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000
|S11|
0.843 0.843 0.842 0.842 0.843 0.843 0.843 0.843 0.842 0.841 0.840
S11 -67.5 -68.2 -68.8 -69.5 -70.2 -71.0 -71.6 -72.4 -73.0 -74.0 -75.0
|S11|
0.762 0.759 0.755 0.752 0.747 0.744 0.741 0.739 0.734 0.730 0.723
S11 -76.9 -77.8 -79.0 -80.1 -81.2 -82.2 -83.2 -84.3 -85.5 -86.7 87.9
12
______________________________________________________________________________________
Triple/Dual-Mode CDMA LNA/Mixers
Typical Operating Circuit
0.01F VCC 2.7pF CELL 2.7nH 0.75pFPCS 7pF 20 8.2nH 2.7nH 6800pF 15nH
MAX2338
24k 1 PCS 100pF 6800pF 2.2nH 2
28
27
26
25
24
23
22 24k 21 120nH 20 3.3k 120nH 4pF CDMA VCC 100pF
3 6800pF 3.9nH CELLULAR BAND LIN 5 6 4
19
4pF
18
100pF VCC 8.25k 1%
MAX2338
/2
17 BUFFEN 16 120nH 15 4.7pF
GAIN
7 8 9 LO/2 10 22pF 11 12 13 14 N.C.
FM
PCS LO
LO_OUT
Package Information
For the latest package outline information, go to www.maxim-ic.com/packages.
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 13 (c) 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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