19-1807; Rev 2; 4/03
KIT
ATION
EVALU
E
L
B
A
AVAIL
Triple/Dual-Mode CDMA LNA/Mixers
Features
♦ 1.4dB LNA Noise Figure
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.
♦ LO Frequency Divider, Saves VCO Module
♦ 15dB LNA Gain
♦ Mixer Noise Figure
7.5dB (CDMA)
8.7dB (AMPS)
♦ Mixer Gain
14.5dB PCS
13.3dB Cellular
8.8dB AMPS
♦ LO Output Buffers for TX
♦ Ultra-Small 28-Pin Leadless Package
Ordering Information
________________________Applications
PART
MAX2338EGI
TEMP RANGE
PIN-PACKAGE
-40°C to +85°C
28 QFN
Dual-Band, Triple-Mode PCS/Cellular Phones
Dual-Mode Cellular Phones
PLNAOUT
GND
GND
PMIXIN
CMIXIN
TOP VIEW
GND
Typical Operating Circuit appears at end of data sheet.
CLNAOUT
Pin Configuration/
Functional Diagram
28
27
26
25
24
23
22
RLNA 1
21 RBIAS
PLNAIN 2
20 IF+
GND 3
19 IF-
CLNAIN 4
BAND 5
18 GND
17 BUFFEN
MAX2338
LIN 6
16 VCC
÷2
GAIN 7
8
9
10
11
12
13
14
GND
LO/2
LOIN
GND
PLOOUT
CLOOUT
N.C.
15 FMOUT
QFN
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
MAX2338
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.
MAX2338
Triple/Dual-Mode CDMA LNA/Mixers
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 = +70°C)
28-Pin QFN (derate 28.5mW/°C above TA = +70°C).........2W
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) ................................ +300°C
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 = 24kΩ, BUFFEN = LOW, all RF and IF outputs connected to VCC, no RF applied, TA = -40°C
to +85°C. Typical values are at +3.0V and TA = +25°C, unless otherwise noted. Refer to Operational Modes table for control logic.)
PARAMETER
CONDITIONS
MIN
TYP
MAX
High-gain, low-linearity mode
18
24
High-gain, high-linearity mode
25
33
19.5
25
UNITS
PCS CDMA MODES
Operating Supply Current
mA
CELLULAR CDMA MODE
Low-gain mode
Operating Supply Current
mA
High-gain, low-linearity mode
18
24
High-gain, high-linearity mode
28
35
13.5
17
mA
0.1
5
µA
LO/2 = LOW
7.2
9.5
LO/2 = HIGH
10.3
FM MODE
Operating Supply Current
SHUTDOWN MODE
Shutdown Supply Current
ALL MODES
LO Buffer Supply Current
BUFFEN = HIGH
Additional Operational Current
Divider Active
Cellular and FM mode; LO/2 = HIGH
Digital Input Logic High
1.2
Digital Input High Current
Digital Input Low Current
2
mA
2.0
Digital Input Logic Low
-25
_______________________________________________________________________________________
mA
V
0.6
V
5
µA
µA
Triple/Dual-Mode CDMA LNA/Mixers
(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 50Ω, RRLNA = RRBIAS = 24kΩ, TA = -40°C to +85°C. Typical values are at
TA = +25°C, VCC = +3.0V, unless otherwise noted.)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
869
894
MHz
OVERALL PERFORMANCE
Low-Band RF Frequency Range
High-Band RF Frequency Range
1930
1990
MHz
Low-Band LO Frequency Range
After divider if active (Note 1)
950
1100
MHz
High-Band LO Frequency Range
(Note 1)
1750
2210
MHz
IF Frequency Range
(Note 1)
80
LO Input Level
220
MHz
-7
-3
0
dBm
14.0
CELLULAR LNA PERFORMANCE
HIGH-GAIN, HIGH-LINEARITY MODES
Gain (Note 2)
15.7
17.0
dB
Noise Figure (Note 3)
TA = +25°C
1.4
1.6
dB
Noise Figure Change Due to
Temperature
TA = +25°C to TMAX
0.3
dB
9.5
12
dBm
13
14.7
16.5
dB
1.4
1.7
dB
IIP3 (Notes 3, 4)
CDMA HIGH-GAIN, LOW-LINEARITY MODE AND FM MODE
Gain (Note 2)
Noise Figure (Note 3)
TA = +25°C
IIP3 (Note 3, 4)
2.5
5.5
dBm
-4.0
-2.3
0
dBm
5
6
dB
CDMA LOW-GAIN MODE
Gain (Note 2)
Noise Figure (Note 3)
IIP3 (Notes 3, 4)
15
18
13.8
dBm
PCS LNA PERFORMANCE
CDMA HIGH-GAIN, HIGH-LINEARITY MODE
Gain (Note 2)
15.3
16.9
dB
Noise Figure (Note 3)
TA = +25°C
1.4
1.7
dB
Noise Figure Change Due to
Temperature
TA = +25°C to TMAX
0.3
dB
5.0
7.7
dBm
13.0
14.5
16.5
dB
1.4
1.7
dB
IIP3 (Notes 3, 5)
CDMA HIGH-GAIN, LOW-LINEARITY MODE
Gain (Note 2)
Noise Figure (Note 3)
TA = +25°C
IIP3 (Notes 3, 5)
2.5
7.5
dBm
10.3
13.3
16.4
7.8
9.0
3.0
5.5
CELLULAR MIXER PERFORMANCE
CDMA HIGH-GAIN, HIGH-LINEARITY, AND LOW-GAIN MODES
Gain (Note 2)
Noise Figure (Note 3)
IIP3 (Note 4)
TA = +25°C
dB
dB
dBm
_______________________________________________________________________________________
3
MAX2338
AC ELECTRICAL CHARACTERISTICS
MAX2338
Triple/Dual-Mode CDMA LNA/Mixers
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 50Ω, RRLNA = RRBIAS = 24kΩ, TA = -40°C to +85°C. Typical values are at
TA = +25°C, VCC = +3.0V, unless otherwise noted.)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
HIGH-GAIN, LOW-LINEARITY IDLE MODE
Gain (Note 2)
Noise Figure (Note 3)
10.1
TA = +25°C
IIP3 (Notes 3, 4)
13
16
dB
7.3
9.0
dB
1.4
3.5
dBm
6.0
8.8
11.1
8.7
11.0
1.4
3.4
11.7
14.5
17
dB
7.8
9.0
dB
FM MODE
Gain (Note 2)
Noise Figure (Note 3)
TA = +25°C
IIP3 (Note 4)
dB
dB
dBm
PCS MIXER PERFORMANCE
CDMA HIGH-GAIN, HIGH-LINEARITY MODE
Gain (Note 2)
Noise Figure (Note 3)
TA = +25°C
IIP3 (Notes 3, 5)
3.5
7.5
dBm
HIGH-GAIN, LOW-LINEARITY MODE
Gain (Note 2)
Noise Figure (Note 3)
11.2
TA = +25°C
IIP3 (Note 5)
0.5
14
16.2
dB
7.2
9.0
dB
2.5
dBm
-1
dBm
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)
Into 50Ω or 100Ω load, BUFFEN = HIGH
LO Output Leakage
BUFFEN = LOW
>45
dB
25
33
dBm
-12
-6
dBm
-35
dBm
LO Emission at PCS LNA Input Port
-55
dBm
LO Emission at Cellular LNA Input
Port
-55
dBm
-15
dBc
LO Output Harmonic Suppression
BUFFEN = HIGH
PCS band, 80MHz below LO
-161
Cellular band, 45MHz below LO
-161
LO Output Noise Power
BUFFEN = HIGH
RF Ports Return Loss
All active RF ports including 2-element matching
dBm/Hz
10
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.
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
4
_______________________________________________________________________________________
dB
Triple/Dual-Mode CDMA LNA/Mixers
HGHL
25
10
5
15
HGLL
0
50
100
11
10
-50
0
50
100
4
6
8
10
12
14
TEMPERATURE (°C)
TEMPERATURE (°C)
LNA CURRENT (mA)
CELLULAR-BAND HGHL LNA GAIN
vs. CURRENT
CELLULAR-BAND LNA GAIN
vs. FREQUENCY
PCS-BAND LNA GAIN
vs. FREQUENCY
TA = -40°C
17
HGHL
15
16
TA = +25°C
14
14
10
GAIN (dB)
GAIN (dB)
15
HGHL
15
HGLL, FM
16
16
17
MAX2338 toc05
20
MAX2338 toc04
18
GAIN (dB)
13
12
0
-50
TA = +85°C
TA = +25°C
FM
10
5
0
14
MAX2338 toc06
15
15
LGHL
20
TA = -40°C
16
GAIN (dB)
SUPPLY CURRENT (mA)
SUPPLY CURRENT (mA)
HGLL
17
MAX2338 toc02
HGHL
25
20
30
MAX2338 toc01
30
PCS-BAND HGHL LNA GAIN
vs. CURRENT
CELLULAR-BAND SUPPLY CURRENT
MAX2338 toc03
PCS-BAND SUPPLY CURRENT
5
TA = +85°C
HGLL
13
12
11
10
0
13
9
LGHL
8
7
-5
12
8
10
12
14
16
18
20
850
860
LNA CURRENT (mA)
880
890
1900
900
14
MAX2338 toc07
TA = -40°C
TA = -40°C
TA = +25°C
12
1940
1960
1980
2000
FREQUENCY (MHz)
PCS-BAND HGHL LNA NOISE FIGURE
vs. FREQUENCY
CELLULAR-BAND HGHL LNA IIP3
vs. CURRENT
10
2.0
1.9
8
7
TA = +25°C
6
TA = +85°C
5
NOISE FIGURE (dB)
1.8
10
IIP3 (dBm)
IIP3 (dBm)
1920
FREQUENCY (MHz)
PCS-BAND HGHL LNA IIP3
vs. CURRENT
9
870
MAX2338 toc09
6
MAX2338 toc08
4
TA = +85°C
8
6
4
1.7
4mA
1.6
8.4mA
1.5
1.4
4
3
2
1.2
2
4
5
6
7
LNA CURRENT (mA)
8
9
15mA
1.3
4
6
8
10
12
LNA CURRENT (mA)
14
16
1900
1920
1940
1960
1980
2000
FREQUENCY (MHz)
_______________________________________________________________________________________
5
MAX2338
Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
6mA
16
1.2
1.0
0.8
0.6
0.4
14
12
TA = +25°C
10
MAX2338 toc12
1.4
TA = -40°C
TA = -40°C, HIGH-SIDE LO
15
14
CONVERSION GAIN (dB)
11mA
16
MAX2338 toc11
1.6
MAX2338 toc10
16mA
18
CONVERSION GAIN (dB)
TA = +85°C
13
12
11
TA = -40°C, LOW-SIDE LO
10
TA = +25°C, HIGH-SIDE LO
9
TA = +25°C, LOW-SIDE LO
8
8
TA = +85°C, HIGH-SIDE LO
7
0.2
TA = +85°C, LOW-SIDE LO
6
6
0
840
850
860
870
880
890
4
4
900
6
8
10
12
FREQUENCY (MHz)
MIXER CURRENT (mA)
CELLULAR-BAND MIXER CONVERSION
GAIN vs. LO INPUT LEVEL
PCS-BAND MIXER CONVERSION GAIN
vs. LO INPUT LEVEL
15
10
12
14
CELLULAR-BAND MIXER CONVERSION
GAIN vs. RF INPUT LEVEL
14
MAX2338 toc14
HGHL
8
MIXER CURRENT (µA)
16
MAX2338 toc13
14
6
14
HIGH-SIDE LO HGHL
MAX2338 toc15
NOISE FIGURE (dB)
2.0
1.8
PCS-BAND MIXER
CONVERSION GAIN vs. CURRENT
CELLULAR-BAND HGHL MIXER
CONVERSION GAIN vs. CURRENT
CELLULAR-BAND HGHL LNA NOISE
FIGURE vs. FREQUENCY
13
13
14
12
12
LOW-SIDE LO HGHL
GAIN (dB)
GAIN (dB)
GAIN (dB)
HGLL
13
11
12
10
11
9
11
10
-15
-10
-5
0
5
8
-20
-15
LO INPUT LEVEL (dBm)
PCS-BAND MIXER CONVERSION GAIN
vs. RF INPUT LEVEL
16
HIGH-SIDE LO HGHL
-5
0
5
-20
12
TA = +85°C
0
-14
-12
-10
RF INPUT LEVEL (dBm)
6
-8
-6
-6
6
2
0
-2
TA = -40°C
HIGH-SIDE LO, TA = -40°C
-4
-6
-6
-16
-8
HIGH-SIDE LO, TA = +85°C
HIGH-SIDE LO, TA = +25°C
8
IIP3 (dB)
TA = +25°C
-4
-18
-10
4
2
-2
-20
-12
PCS-BAND HGHL MIXER IIP3
vs. CURRENT
10
8
-14
CELLULAR-BAND HGHL MIXER IIP3
vs. CURRENT
6
IIP3 (dB)
LOW-SIDE LO HGHL
-16
RF INPUT LEVEL (dBm)
4
14
-18
LO INPUT LEVEL (dBm)
8
MAX2338 toc16
18
-10
MAX2338 toc17
-20
MAX2338 toc18
10
GAIN (dB)
MAX2338
Triple/Dual-Mode CDMA LNA/Mixers
4
6
8
10
12
MIXER CURRENT (mA)
14
4
6
8
10
MIXER CURRENT (mA)
_______________________________________________________________________________________
12
Triple/Dual-Mode CDMA LNA/Mixers
PCS-BAND MIXER
NOISE FIGURE vs. RF FREQUENCY
CELLULAR-BAND MIXER NOISE FIGURE
vs. RF FREQUENCY
8.0
NOISE FIGURE (dB)
7.5
HGLL
7.0
6.5
6.5
5.5
5.5
HGLL HIGH-SIDE LO
5.0
870
880
890
900
1920
1960
1980
2000
RF FREQUENCY (MHz)
CELLULAR-BAND LO BUFFER
OUTPUT LEVEL vs. INPUT LEVEL
CDMA MIXER IF PORT DIFFERENTIAL
PORT IMPEDANCE
2 x LO / 2
3 x LO / 2
-30
MAX2338 toc22
LO / 2
PARALLEL RESISTANCE (kΩ)
MAX2338 toc21
75
-10
-20
1940
RF FREQUENCY (MHz)
CAPACITANCE
60
-10
-5
0
1.2
30
0.8
RESISTANCE
15
0.4
0
0
5
100
200
300
400
500
LO INPUT LEVEL (dBm)
RF FREQUENCY (MHz)
FM MIXER IF PORT DIFFERENTIAL
PORT IMPEDANCE
PCS-BAND LO BUFFER OUTPUT LEVEL
vs. INPUT LEVEL
50
3.0
0
2.5
-10
2.0
40
CAPACITANCE
30
1.5
20
1.0
10
OUTPUT LEVEL (dBm)
MAX2338 toc23
60
PARALLEL RESISTANCE (kΩ)
-15
1.6
45
0
-40
2.0
PARALLEL RESISTANCE (kΩ)
860
0
OUTPUT LEVEL (dBm)
HGHL HIGH-SIDE LO
7.0
6.0
850
PARALLEL RESISTANCE (kΩ)
7.5
6.0
5.0
HGLL LOW-SIDE LO
MAX2338 toc24
NOISE FIGURE (dB)
HGHL LOW-SIDE LO
8.5
HGHL
8.0
MAX2338 toc20
FM
8.5
9.0
MAX2338 toc19
9.0
LO
-20
2 x LO
-30
-40
3 x LO
-50
-60
0.5
RESISTANCE
-70
0
0
0
100
200
300
RF FREQUENCY (MHz)
400
500
-80
-15
-10
-5
0
5
LO INPUT LEVEL (dBm)
_______________________________________________________________________________________
7
MAX2338
Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
Triple/Dual-Mode CDMA LNA/Mixers
MAX2338
Pin Description
8
PIN
NAME
FUNCTION
1
RLNA
2
PLNAIN
3, 8, 11, 18,
24, 25, 27,
Exposed
Paddle
GND
4
CLNAIN
Low-Band RF Input. Requires a blocking capacitor which may be used as part of the input
matching network.
5
BAND
Band-Select Logic Input. LOW selects high-band (PCS), HIGH selects low-band (cellular).
6
LIN
7
GAIN
Gain-Select Logic Input. See Detailed Description for control modes.
9
LO/2
LO Divider-Select Input. LOW disables LO divider, HIGH selects divider in cellular and FM
modes. See Detailed Description for control modes.
10
LOIN
LO Input Port. Requires an external DC blocking capacitor.
12
PLOOUT
PCS LO Buffer Output Port. Internally matched to 100Ω (nominal). Does not require a blocking
capacitor.
13
CLOOUT
Cell LO Buffer Output Port. Internally matched to 100Ω (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.
14
NC
15
FMOUT
16
VCC
17
BUFFEN
LO Output Buffer Enable. Drive BUFFEN HIGH to power up the LO output buffer associated with
the selected band.
19, 20
IF-, IF+
Mixer Differential Outputs. Require pullup inductors and series capacitors which can be used as
part of the output matching network.
21
RBIAS
Bias Setting Resistor Connection. For nominal bias, connect a 24kΩ resistor to ground. The value
of this resistor sets current for all blocks except HGHL LNA.
22
CMIXIN
Low-Band Mixer Input. Requires a blocking capacitor which may be used as part of the input
matching network.
23
PMIXIN
High-Band Mixer Input. Requires a blocking capacitor which may be used as part of the input
matching network.
26
PLNAOUT
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.
28
CLNAOUT
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.
LNA Bias–Setting Resistor Connection. For nominal bias, connect a 24kΩ 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.
Linearity-Select Logic Input. See Detailed Description for control modes.
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.
_______________________________________________________________________________________
Triple/Dual-Mode CDMA LNA/Mixers
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.
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.
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 50Ω.
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
L
✓
✓
Cellular Band CDMA, High-Gain, Low-Linearity (Idle Mode)
(HGLL)
L
✓
Cellular Band, CDMA, Low-Gain
L
✓
Cellular Band, FM Mode
L
✓
Cellular Band CDMA, High-Gain, High-Linearity (HGHL)
L
✓
Cellular Band CDMA, High-Gain, Low-Linearity (Idle Mode)
(HGLL)
L
✓
Cellular Band, CDMA, Low-Gain
L
✓
Cellular Band, FM Mode
L
✓
Shutdown
—
—
—
—
—
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
LO/2
—
LIN
Cellular Band CDMA, High-Gain, High-Linearity (HGHL)
—
✓
GAIN
—
✓
✓
BAND
—
FM Mixer
Undefined
✓
CDMA LL Mixer
✓
CONTROL PIN
CDMA HL Mixer
✓
H
LGHL Amp
H
PCS Band, High-Gain, Low-Linearty (Idle Mode) (HGLL)
HGLL Amp
LOX1
PCS Band, High-Gain, High-Linearity (HGHL)
HGHL Amp
BAND (H/L)
MODES
LO /2
FUNCTION
0
1
1
X
0
1
0
X
0
0
1
X
1
1
1
1
1
1
0
1
1
0
1
1
1
0
0
1
1
1
1
0
1
1
0
0
1
0
1
0
1
0
0
0
0
0
0
X
_______________________________________________________________________________________
9
MAX2338
Detailed Description
MAX2338
Triple/Dual-Mode CDMA LNA/Mixers
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.
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-
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.
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
10
FREQUENCY (MHz)
|S11|
∠S11
|S21|
∠S21
|S12|
∠S12
|S22|
∠S22
30
0.905
-5.4
0.145
-38
0.002
-55
0.98
-47
50
0.899
-8.1
0.467
-57
0.003
-126
0.94
-72
100
0.891
-15.1
1.34
-86
0.012
-174
0.96
-117
150
0.884
-21.8
2.2
-108
0.023
176
0.96
-144
200
0.874
-28.2
2.83
-127
0.027
165.8
0.95
-162
300
0.85
-41.6
3.77
-157.5
0.029
137
0.93
-172
400
0.818
-52.5
4.24
178.3
0.030
127
0.90
155
500
0.785
-63.5
4.44
155.4
0.036
112
0.94
129
100
600
0.75
-71.6
4.38
140
0.040
98
0.87
700
0.714
-79.8
4.16
125
0.048
90
0.84
78
800
0.683
-76.5
4.03
112.6
0.059
83.0
0.793
67.5
810
0.681
-77.0
4.01
111.2
0.060
82.8
0.798
66.5
820
0.677
-77.0
3.99
110.0
0.061
82.0
0.800
65.7
830
0.675
-78.0
3.97
108.5
0.061
80.9
0.799
65.0
840
0.670
-78.3
3.96
107.2
0.062
80.6
0.792
64.2
850
0.668
-78.8
3.93
106.4
0.063
79.2
0.782
63.4
860
0.665
-79.0
3.92
104.7
0.063
78.1
0.769
62.7
870
0.661
-79.5
3.91
103.4
0.063
77.2
0.753
61.8
880
0.660
-80.0
3.89
102.1
0.063
76.5
0.733
60.6
890
0.660
-80.4
3.87
100.8
0.063
75.4
0.710
59.4
900
0.653
-81.0
3.86
99.3
0.063
73.5
0.690
57.7
1000
0.614
-97.0
3.59
86.2
0.07
20
0.680
51.8
1250
0.547
-111
3.15
60.8
0.09
-13.2
0.650
37
1500
0.457
-131
2.93
34
0.109
-36
0.610
15.9
1750
0.310
-164
2.48
18
0.14
-62
0.580
-9.6
2000
0.320
166
2.1
-40
0.185
-98
0.490
-33
2500
0.300
141
1.62
-41
0.19
-150
0.360
-70
3000
0.310
122
1.29
-66
0.19
136
0.41
-64
3500
0.360
86
1.18
-88
0.2
90
0.500
-61
4000
0.360
10
1.14
-112
0.2
43
0.480
-50
______________________________________________________________________________________
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)
|S11|
∠S11
|S21|
∠S21
|S12|
∠S12
|S22|
∠S22
30
0.890
-4.9
0.002
-95
0.001
-112
0.996
-48
50
0.883
-7.2
0.001
-60
0.001
-121
0.990
-73
100
0.872
-13.2
0.391
-81
0.002
-178
0.980
-114
200
0.841
-25
0.882
-112
0.007
171
0.970
-150
300
0.799
-35
1.42
-131
0.010
150
0.959
-166
400
0.778
-41
2.1
-153
0.02
125
0.947
-173
600
0.750
-62
2.15
-172
0.02
100
0.943
173
800
0.706
-75
2.2
162
0.025
80
0.944
151
1000
0.676
-85
2.45
150
0.029
65
0.919
133
1200
0.659
-94
2.59
142
0.032
42
0.879
115
1500
0.634
-108
3.03
134
0.036
31
0.824
94.4
1750
0.578
-110
3.58
126
0.038
19
0.780
81
1900
0.560
-90.8
3.64
120.6
0.04
11.8
0.740
61.7
1910
0.558
-91.0
3.64
119.6
0.04
9.06
0.738
60.7
1920
0.554
-91.4
3.64
118.9
0.04
8.8
0.733
59.6
1930
0.551
-91.7
3.63
118.2
0.04
6.7
0.729
58.5
1940
0.547
-92.2
3.63
117.7
0.04
5.3
0.725
57.4
1950
0.543
-92.2
3.63
117.0
0.04
4.87
0.720
56.1
1960
0.538
-92.4
3.63
116.5
0.04
4.1
0.716
55.0
1970
0.536
-92.5
3.61
115.9
0.04
1.8
0.716
53.6
1980
0.533
-92.9
3.60
115.2
0.04
1.5
0.711
52.3
1990
0.530
-93.0
3.59
114.7
0.04
0
0.707
50.9
2000
0.523
-93.4
3.57
113.0
0.04
-2.1
0.702
49.5
2250
0.347
-155
2.88
131
0.05
-32
0.518
24
2500
0.298
-158
2.71
172
0.05
-72
0.489
5
3000
0.273
-160
2.64
-165
0.06
-94
0.473
-18
4000
0.245
-170
2.03
-145
0.067
-120
0.425
-30
______________________________________________________________________________________
11
MAX2338
Triple/Dual-Mode CDMA LNA/Mixers
Table 4. MAX2338 Cellular Band Mixer
Input S-Parameters High-Gain, HighLinearity Mode
12
Table 5. MAX2338 PCS Band Mixer Input
S-Parameters High-Gain, High-Linearity
Mode
FREQUENCY
(MHz)
|S11|
∠S11
FREQUENCY
(MHz)
|S11|
∠S11
800
0.843
-67.5
1900
0.762
-76.9
810
0.843
-68.2
1910
0.759
-77.8
820
0.842
-68.8
1920
0.755
-79.0
830
0.842
-69.5
1930
0.752
-80.1
840
0.843
-70.2
1940
0.747
-81.2
850
0.843
-71.0
1950
0.744
-82.2
860
0.843
-71.6
1960
0.741
-83.2
870
0.843
-72.4
1970
0.739
-84.3
880
0.842
-73.0
1980
0.734
-85.5
890
0.841
-74.0
1990
0.730
-86.7
900
0.840
-75.0
2000
0.723
87.9
______________________________________________________________________________________
Triple/Dual-Mode CDMA LNA/Mixers
0.01µF
CELL
VCC
2.7nH 0.75pFPCS
2.7pF
7pF
20Ω
2.7nH
6800pF
15nH
8.2nH
28
26
27
25
24
22
23
24kΩ
24kΩ
PCS
VCC
21
1
100pF
120nH
6800pF
2.2nH
4pF CDMA
20
2
120nH
3.3kΩ
3
19
4
18
4pF
6800pF
3.9nH
100pF
CELLULAR
BAND
5
LIN
6
GAIN
MAX2338
17 BUFFEN
16
÷2
120nH
VCC
8.25kΩ
1%
15
7
4.7pF
8
9
11
10
12
13
22pF
LO/2
PCS LO
FM
14
N.C.
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
© 2003 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
MAX2338
Typical Operating Circuit
工商网监
湘ICP备2023018690号
