
Adjustable, High-Linearity,
SiGe Dual-Band LNA/Mixer ICs
Pin Description (continued)
PIN
PIN
MAX2320
MAX2321
MAX2322
MAX2324
MAX2327
NAME
FUNCTION
MAX2326
High-Frequency LO Buffer Output. Open-collec-
11
11
—
11
LOHOUT
tor output requires pull-up inductor or pull-up
resistor of 100 ? or less. Reactive match to the
load delivers maximum power.
Low-Frequency LO Buffer Output. Open-collec-
12
—
12
12
LOLOUT
tor output requires pull-up inductor or pull-up
resistor of 100 ? or less. Reactive match to the
load delivers maximum power.
FM Mixer Output. Requires a pull-up inductor to
13
—
13
13
FMOUT
V CC and a series capacitor as part of the match-
ing network.
—
14
13
14
—
14
—
14
LOX2
V CC
LO Doubler Logic Input. Drive LOX2 high to
enable the LO doubler.
Power Supply. Bypass with a 1000pF capacitor
as close to the pin as possible.
LO Output Buffer Enable. The LO buffers are
15
15
15
15
BUFFEN
controlled separately from the rest of the IC. Drive
BUFFEN high to power up the LO output buffer
associated with the selected LO input port.
16, 17
—
16, 17
—
16, 17
—
—
16, 17
CDMA-,
CDMA+
IFOUT+,
IFOUT-
CDMA Mixer Differential Outputs. Require pull-
up inductors and series capacitors as part of the
matching network.
Mixer Differential Outputs. Require pull-up
inductors and series capacitors as part of the
matching network.
Bias-Setting Resistor Connection. For nominal
bias, connect 20k ? resistor to ground. The resis-
18
18
18
18
RBIAS
tor value controls the digital LNA’s linearity in
low-gain, digital, or FM mode, and controls the
mixers in all modes.
Low-Band Mixer Input. Requires a blocking
19
—
19
19
MIXINL
capacitor and a matching network. The capaci-
tor may be used as part of the matching net-
work.
High-Band Mixer Input. Requires a blocking
20
20
—
20
MIXINH
capacitor and a matching network. The capaci-
tor may be used as part of the matching net-
work.
—
2, 5, 9, 12,
19
1, 10, 11, 20
3
N.C.
No Connection. Do not make any connection to
these pins.
Ground Reference for RF, DC, and Logic Inputs.
Slug
Slug
Slug
Slug
GND
Solder the slug evenly to the board ground
plane.
14
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