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MAX2338ETI+T

P1-P3P4-P6P7-P9P10-P12P13-P13
_______________________________________________________________________________________ 7
MAX2338
Triple/Dual-Mode CDMA LNA/Mixers
Typical Operating Characteristics (continued)
(T
A
= +25°C, unless otherwise noted.)
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
9.0
850 860 870 880 890 900
CELLULAR-BAND MIXER NOISE FIGURE
vs. RF FREQUENCY
MAX2338 toc19
RF FREQUENCY (MHz)
NOISE FIGURE (dB)
FM
HGHL
HGLL
-80
-60
-70
-50
-20
-10
-30
-40
0
-15 -10 -5 0 5
PCS-BAND LO BUFFER OUTPUT LEVEL
vs. INPUT LEVEL
MAX2338 toc24
LO INPUT LEVEL (dBm)
OUTPUT LEVEL (dBm)
LO
2 x LO
3 x LO
0 200100 300 400
0
15
45
30
60
75
500
CDMA MIXER IF PORT DIFFERENTIAL
PORT IMPEDANCE
MAX2338 toc22
RF FREQUENCY (MHz)
PARALLEL RESISTANCE (kΩ)
0
0.4
1.2
0.8
1.6
2.0
PARALLEL RESISTANCE (kΩ)
CAPACITANCE
RESISTANCE
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
9.0
1920 1940 1960 1980 2000
PCS-BAND MIXER
NOISE FIGURE vs. RF FREQUENCY
MAX2338 toc20
RF FREQUENCY (MHz)
NOISE FIGURE (dB)
HGHL LOW-SIDE LO
HGLL LOW-SIDE LO
HGHL HIGH-SIDE LO
HGLL HIGH-SIDE LO
OUTPUT LEVEL (dBm)
0
-10
-20
-30
-40
-15 -5-10 0 5
CELLULAR-BAND LO BUFFER
OUTPUT LEVEL vs. INPUT LEVEL
MAX2338 toc21
LO INPUT LEVEL (dBm)
LO / 2
2 x LO / 2
3 x LO / 2
MAX2338
Triple/Dual-Mode CDMA LNA/Mixers
8 _______________________________________________________________________________________
Pin Description
PIN NAME FUNCTION
1 RLNA
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.
2 PLNAIN
High-Band RF Input. Requires a blocking capacitor which may be used as part of the input
matching network.
3, 8, 11, 18,
24, 25, 27,
Exposed
Paddle
GND
Ground Reference for RF, DC and Logic Inputs. Solder the exposed paddle evenly to the circuit
board ground plane.
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 Linearity-Select Logic Input. See Detailed Description for control modes.
7 GAIN Gain-Select Logic Input. See Detailed Description for control modes.
9LO/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 No Connection
15 FMOUT
FM Mixer Output Port. Requires pullup inductor and DC blocking capacitor, which may be used
as part of the output matching network.
16 V
CC
Power Supply Pin. Bypass with capacitor as close to the pin as possible.
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 V
CC
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 V
CC
and an external series blocking
capacitor which may be used as a part of the output matching network.
MAX2338
Triple/Dual-Mode CDMA LNA/Mixers
_______________________________________________________________________________________ 9
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.
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.
Downconverter
The downconverters in these devices are double bal-
anced mixers. The PCS band mixer and digital cellular
band mixer share the same IF output ports. The cellular
FM band mixer has its own IF output to feed to a different
filter. When the linearity requirement is high, the LIN con-
trol 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.
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 cel-
lular band.
FUNCTION CONTROL PIN
MODES
BAND (H/L)
LOX1
LO /2
HGHL Amp
HGLL Amp
LGHL Amp
CDMA HL Mixer
CDMA LL Mixer
FM Mixer
BAND
GAIN
LIN
LO/2
PCS Band, High-Gain, High-Linearity (HGHL) H ✓✓ ✓ 011 X
PCS Band, High-Gain, Low-Linearty (Idle Mode) (HGLL) H ✓✓✓010X
Undefined ————————— 001 X
Cellular Band CDMA, High-Gain, High-Linearity (HGHL) L ✓✓ ✓ 111 1
Cellular Band CDMA, High-Gain, Low-Linearity (Idle Mode)
(HGLL)
L ✓✓ ✓ 110 1
Cellular Band, CDMA, Low-Gain L ✓✓✓ 101 1
Cellular Band, FM Mode L ✓✓ ✓100 1
Cellular Band CDMA, High-Gain, High-Linearity (HGHL) L ✓✓ ✓ 111 0
Cellular Band CDMA, High-Gain, Low-Linearity (Idle Mode)
(HGLL)
L ✓✓✓110 0
Cellular Band, CDMA, Low-Gain L ✓✓✓101 0
Cellular Band, FM Mode L ✓✓ ✓100 0
Shutdown 000X
Table 1. Operational Modes
P1-P3P4-P6P7-P9P10-P12P13-P13

MAX2338ETI+T

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Buy MAX2338ETI+T
Manufacturer:
Maxim Integrated
Description:
RF Front End Triple/Dual-Mode CDMA LNA/Mixer
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