CDMA IF VGAs and I/Q Demodulators
with VCO and Synthesizer
Typical Operating Characteristics (continued)
(MAX2310/MAX2314 or MAX2312/MAX2316 EV kit, V
= +2.75V, registers set to default power-up states, f = 210.88MHz for
IN
CC
CDMA, f = 85.88MHz for FM, f
= 19.68MHz, synthesizer locked with passive 2nd-order lead-lag loop filter, SHDN = high, VGC
IN
REF
set for +35dB voltage gain, differential output load = 10kΩ, all power levels referred to 50Ω, T = +25°C, unless otherwise noted.)
A
FM PORT
S11 vs. FREQUENCY
TANKL PORT
1/S11 vs. FREQUENCY
TANKH PORT
1/S11 vs. FREQUENCY
4
4
3
2
1
3
2
1
1
2
3
4
1: 641 - j428 10MHz
2: 27 - j162 85MHz
3: 4 - j73 210MHz
4: 1.8 - j39 600MHz
1: 1.98ms + j437µs, 100MHz
2: 2.18ms + j853µs, 160MHz
3: 2.11ms +j 2.53ms, 420MHz
4: 2.17ms +j 3.71ms, 600MHz
1: -3.06ms + j349µs, 100MHz
2: -3.01ms + j853µs, 160MHz
3: -3.11ms + j1.45ms, 240MHz
4: -3.04ms + j1.85ms, 300MHz
CDMA PORT
S11 vs. FREQUENCY
LOOUT PORT
S22 vs. FREQUENCY
1
2
1: 108.63Ω (Re)
10.266Ω (1m)
40MHz
3
2: 134.99Ω (Re)
13.71Ω (1m)
150MHz
3: 158.83Ω (Re)
39.58Ω (1m)
300MHz
4
1: 10MHz, 375Ω - j56Ω
2: 85MHz, 285Ω - j200Ω
3: 210MHz, 73Ω - j169Ω
4: 600MHz, 2.1Ω - j34Ω
Pin Description
PIN
NAME
FUNCTION
MAX2310
MAX2312
MAX2314
MAX2316
Bypass Node. Must be capacitively decoupled (bypassed)
to analog ground.
1
1
1, 8
1
BYP
2
3
2
3
2
3
2
3
CP_OUT
GND
Charge-Pump Output
Analog Ground Reference
TANKL+,
TANKL-
4, 5
—
—
4
4, 5
—
5, 6
4
Differential Tank Input for Low-Frequency Oscillator
High selects M1/R1; low selects M2/R2.
DIVSEL
6
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