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CDMA IF VGAs and I/Q Demodulators
with VCO and Synthesizer
AC ELECTRICAL CHARACTERISTICS
(MAX2306/MAX2308/MAX2309 EV kit, V CC = +2.75V, registers set to default power-up states except M1 = M2 = 306, R1 = R2 = 16,
f IN = 183.7MHz, f REF = 19.2MHz, 0.6Vp-p synthesizer locked with passive 3rd-order lead-lag loop filter, SHDN = high, VGC set for
+35dB voltage gain, differential output load = 10k ? , all power levels referred to 50 ? , T A = +25°C, unless otherwise noted.)
PARAMETER
Input Frequency
SYMBOL
f IN
(Note 2)
CONDITIONS
MIN
40
TYP
MAX
300
UNITS
MHz
Reference Frequency
Frequency Reference Signal
Level
f REF
V REF
0.2
39
MHz
Vp-p
SIGNAL PATH, CDMA MODE
Gain = -35dB, (Note 3)
3.4
Input 3rd-Order Intercept
Input 1dB Compression
Input 0.25dB Desensitization
IIP3
P 1dB
Gain = +35dB, T A = -40°C to +85°C
(Notes 4, 5)
Gain = -35dB
Gain = +35dB
Gain = -35dB
(Note 6)
Gain = +35dB
-38
-9
-44
-31.0
-14.8
-49
dBm
dBm
dBm
Minimum Voltage Gain
A V
V VGC = 0.5V (Note 5)
-56
-51
dB
Maximum Voltage Gain
DSB Noise Figure
A V
NF
V VGC = 2.3V (Note 5)
Gain = -35dB
Gain = +35dB
57
61
62.9
6.36
dB
dBm
SIGNAL PATH, FM_IQ MODE
Gain = -35dB, (Note 7)
-6.5
Input 3rd-Order Intercept
Input 1dB Compression
IIP3
P 1dB
Gain = +35dB, T A = -40°C to +85°C
(Notes 5, 8)
Gain = -35dB
Gain = +35dB
-40.2
-20
-44
-32
dBm
dBm
Minimum Voltage Gain
A V
V VGC = 0.5V (Note 5)
-56.7
-52
dB
Maximum Voltage Gain
A V
V VGC = 2.3V (Note 5)
56
59.5
dB
SIGNAL PATH, CDMA AND FM_IQ MODE
Gain Variation Over Temperature
Baseband 0.5dB Bandwidth
Normalized to +25°C
± 2.5
4.2
dB
MHz
Quadrature Suppression
LO to Baseband Leakage
T A = -40°C to +85°C (Note 5)
28
40
1
dB
mVp-p
Saturated Output Level
V SAT
Differential
2.7
Vp-p
PHASE-LOCKED LOOP
VCO Tune Range
LO_OUT Output Power
F VCO _ L
F VCO _ H
P LO
(Note 2)
(Note 2)
R L = 50 ? , BUFEN = low
80
135
-13.7
300
600
MHz
dBm
VCO Minimum Divide Ratio
VCO Maximum Divide Ratio
REF Minimum Divide Ratio
M1, M2
M1, M2
R1, R2
16383
256
2
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