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Low-Voltage IF Transceiver with
Limiter/RSSI and Quadrature Modulator
Note 4: Driving RXIN or RXIN with a power level greater than the 1dB compression level forces the input stage out of its linear
range, causing harmonic and intermodulation distortion. The RSSI output increases monotonically with increasing input
levels beyond the mixer’s 1dB compression level. Input 1dB compression point is limited by MIXOUT voltage swing, which
is approximately 2Vp-p into a 165 ? load.
Note 5: Assuming the supply voltage has been applied, this includes limiter offset-correction settling and Rx or Tx bias stabilization
time. Guaranteed by design and characterization.
Note 6: The RSSI maximum zero-scale intercept is the maximum (over a statistical sample of parts) input power at which the RSSI
output would be 0V. This point is extrapolated from the linear portion of the RSSI Output Voltage vs. Limiter Input Power
graph in the Typical Operating Characteristics . This specification and the RSSI slope define the RSSI function’s ideal
behavior (the slope and intercept of a straight line), while the RSSI relative error specification defines the deviations from
this line. See the Typical Operating Characteristics for the RSSI Output Voltage vs. Limiter Input Power graph.
Note 7: The RSSI relative error is the deviation from the best-fitting straight line of the RSSI output voltage versus the limiter input
power. This number represents the worst-case deviation at any point along this line. A 0dB relative error is exactly on the
ideal RSSI transfer function. The limiter input power range for this test is -75dBm to 5dBm from 50 ? . See the Typical
Operating Characteristics for the RSSI Relative Error graph.
Note 8: Transmit sideband suppression is typically better than 35dB. Operation outside this frequency range is possible but has
not been characterized.
Note 9: Output IM3 level is typically better than -29dBc.
Note 10: The output power can be increased by raising GC above 2V. Refer to the Transmitter Output Power vs. GC Voltage and
Frequency graph in the Typical Operating Characteristics .
Note 11: Using two tones at 400kHz and 500kHz, 250mVp-p differential per tone at I, I , Q, Q .
__________________________________________Typical Operating Characteristics
(MAX2510 EV kit; V CC = +3.0V; 0.01μF across CZ and CZ ; MIXOUT tied to VREF through 165 ? resistor; TXOUT and TXOUT loaded
with 100 ? differential; LO terminated with 50 ? ; LO AC grounded; GC open; LIMOUT, LIMOUT open; 330pF at RSSI pin; 0.1μF con-
nected from VREF pin to GND; P RXIN, RXIN = -30dBm differentially driven (input matched); f RXIN, RXIN = 240MHz; bias voltage at I, I ,
Q, Q = 1.4V; V I,Q = 500mVp-p; f I, Q = 200kHz; f LO, LO = 230MHz; P LO = -13dBm; T A = +25°C; unless otherwise noted.)
25
SUPPLY CURRENT
vs. TEMPERATURE
20
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
35
TRANSMITTER SUPPLY CURRENT
vs. GC VOLTAGE
Tx
18
Tx
30
20
15
Rx
16
14
12
Rx
25
20
10
10
5
0
STANDBY
8
6
4
2
0
STANDBY
15
10
5
0
-40
-20
0
20
40
60
80
100
2.5
3.0
3.5
4.0
4.5
5.0
5.5
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
GC VOLTAGE (V)
4
_______________________________________________________________________________________
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