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WCDMA Quasi-Direct Modulator
with VGA and PA Driver
AC ELECTRICAL CHARACTERISTICS
MAX2395 EV kit, V CC = +2.7V to +3.3V, R BIAS = 12k ? , V VGC adjusted to obtain maximum rated output power, and T A = -40°C to
+85°C. I/Q inputs driven differentially with low- impedance source based on 3GPP UpLink reference measurement channel
(12.2kbps), envelope level 1V P-P . Typical values are at V CC = +2.85V and T A = +25°C, unless otherwise noted. See Tables 1 and 3 for
register settings.) (Note 2)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
CASCADED RF SPECIFICATIONS
RF Frequency Range
(Notes 4, 6)
Maximum Output Power
(Note 6)
Out-of-Band Emissions
(Note 6)
VGC set for maximum output power while meeting
ACPR1, ACPR2, out-of-band emissions, and output
noise density specifications
At f = 1575MHz
At RF + 2 x IF (image)
1920
6
1950
-31
-13
1980
-24
-8.5
MHz
dBm
dBc
Adjacent Channel Power Ratio,
ACPR1 (Notes 5, 6)
? ? f = ±5MHz/3.84MHz
BW
P OUT > 0dBm and T A > 0°C
P OUT ≤ 0dBm and T A ≤ 0°C
-48
-45
-45
-43
dBc
Alternate Channel Power Ratio,
ACPR2 (Notes 5, 6)
Output Noise Power Density
(Note 6)
Minimum Output Power
Carrier Suppression
Sideband Suppression
EVM (Note 6)
? ? f = ±10MHz/3.84MHz BW
P OUT = +6dBm at 1920MHz, noise measured at 1880MHz
P OUT = +6dBm at 1980MHz, noise measured at 2110MHz
V VGC = 0.35V
Including BB filter, P OUT = +6dBm
Including BB filter, P OUT = -44dBm
30
32
-60
-140
-146
-85
5
8.6
-57
-137
-143
-78
7.5
14.6
dBc
dBc/Hz
dBm
dB
dB
% RMS
I/Q MODULATION BASEBAND INPUTS
Passband Amplitude Ripple
DC to 2MHz (Notes 6, 7)
-0.3
+0.4
dB
Baseband Selectivity
Relative to passband
At 8.08MHz
At 13.44MHz
8
25
35
50
dB
INTEGER-N RF PLL
Main PLL Integer Division Ratios
16-bit register (64/65 dual-modulus prescaler)
4032
9750
65,535
Reference Frequency Range
8
19.2
40
MHz
Input Frequency for Reference
Frequency Doubler
Reference-Divider Ratio
OPCTRL register bit 7 = 1
9-bit register
13
80
16
511
MHz
Charge-Pump Nominal Currents
(Sink or Source)
Locked, RCP1/RCP0 = 0 1, V CC /2
Locked, RCP1/RCP0 = 1 1, V CC /2
1200
2000
1500
2500
1800
3000
μA
Charge-Pump Leakage Current
20
nA
_______________________________________________________________________________________
3
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