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Complete 450MHz Quadrature Transmitter
AC ELECTRICAL CHARACTERISTICS
(MAX2370 EV kit, V CC = +2.7V to +3.3V, SHDN = IDLE = TXGATE = high, V GC = 2.5V, R BIAS = 10k ? , 50 ? system, T A = -40 ° C to
+85 ° C. Typical values are at V CC_ = SHDN = IDLE = TXGATE = CS = 3.0V, f REF = 19.2MHz, LO input power = -15dBm, f LO = 575MHz,
f RFOUT = 455MHz, f IF = 120MHz, registers set according to Table 1, input voltage at I and Q = 130mV RMS differential,
cascade specifications assume 400 ? IF filter with 5dB insertion loss, T A = +25 ° C, unless otherwise noted.) (Note 1)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
MODULATOR
IF Frequency Range
Typically meets 30dB sideband suppression over this
frequency range
95 to 195
MHz
I/Q Common-Mode Input Voltage
I/Q Input Current
(Notes 2, 3)
V CM = 1.4V
1.35
V CC -
1.25
6
V
μA
Gain-Control Range
V GC = 0.5V to 2.5V
+25 ° C < T A < +85 ° C
T A = -40 ° C
70
87
85
dB
Gain Variation Over Temperature
Relative to +25 ° C, T A = -40 ° C to +85 ° C
-2.4, +3.4
dB
Carrier Suppression
Sideband Suppression
V GC = 2.5V
V GC = 2.5V
30
30
40
40
dB
dB
IF Output Noise at Rx Band
V GC set to give -12dBm IF output power, noise
measured at 10MHz offset (Note 4)
f OFFSET = ±885kHz in 30kHz BW
V GC set to give
-138
-66
-135
dBm/Hz
IF Adjacent Channel Power Ratio
IS-95 Reverse Modulation
-12dBm IF output
power, IFG[2:0] =
011
f OFFSET = ±1.125MHz in 30kHz BW
f OFFSET = ±1.98MHz in 30kHz BW
f OFFSET = ±4MHz in 30kHz BW
-69
-84
-89
dBc
UPCONVERTER AND PREDRIVER
RFOUT Frequency Range
LO Frequency Range
See the Typical Operating Characteristics for typical gain
vs. frequency
Typically meets 30dB image suppression over this range
410 to 500
530 to 695
MHz
MHz
LO and RFPLL Input Power
Conversion Gain
MPL Gain Change
MPL = 0, gain relative to MPL = 1
-15
-7
23
-3.4
0
dBm
dB
dB
RF Gain-Control Range
V GC = 0.5V to 2.5V
+25 ° C < T A < +85 ° C
T A = -40 ° C
30
44
46
dB
RF Image Suppression
At maximum output power
-20
dBc
Rx Band Noise Power
P RFOUT = +8dBm, noise measured at +10MHz offset
(Note 4)
-130
-128.5
dBm/Hz
CASCADED MODULATOR, UPCONVERTER, AND PREDRIVER
RFOUT Output Power Meets ACPR specifications (Note 4)
f OFFSET = ±885kHz in 30kHz BW
5.5
10
-64
-57
dBm
P OUT = +8dBm,
IFG[2:0] = 011
f OFFSET = ±1.125MHz in 30kHz BW
f OFFSET = ±1.98MHz in 30kHz BW
-66
-82
-61
-78
Adjacent Channel Power Ratio
IS-95 Reverse Modulation (Note 4)
P OUT = +5.5dBm,
IFG[2:0] = 011
f OFFSET = ±4MHz in 30kHz BW
f OFFSET = ±885kHz in 30kHz BW
f OFFSET = ±1.125MHz in 30kHz BW
f OFFSET = ±1.98MHz in 30kHz BW
f OFFSET = ±4MHz in 30kHz BW
-86
-64
-67
-81
-86
-78
-58
-62
-78
-85
dBc
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3
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