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Low-Voltage IF Transceiver
with Limiter and RSSI
AC ELECTRICAL CHARACTERISTICS
(MAX2511 test fixture, V CC = +3.0V, RXEN = TXEN = low, 0.01μF across CZ and CZ , MIXOUT tied to VREF through 165 ? resistor,
TXIN, TXIN tied to VREF through 50 ? resistor, TXOUT and TXOUT loaded with 100 ? differential, GC open, LIMOUT, LIMOUT loaded
with 2k ? differential, TANK and TANK driven with -2.5dBm from a 100 ? source; OSCOUT AC-terminated with 50 ? , 330pF at RSSI
pin, 0.1μF at VREF pin, Rx inputs and Tx outputs differentially coupled, P RXIN, RXIN = -28dBm (200 ? system), f RXIN, RXIN = 425MHz,
f LO = 435.7MHz, f TXIN, TXIN = 10.7MHz, T A = +25°C, unless otherwise noted.)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
DOWNCONVERTER (RXEN = high)
Downconverter Mixer Voltage Gain
T A = +25°C
T A = -40°C to +85°C (Note 1)
21.5
20
23.6
25.5
27
dB
Downconverter Mixer Noise Figure
14
dB
Downconverter Mixer Input 1dB
Compression Level
Input Third-Order Intercept
(Note 2)
Two tones at 424MHz and 425MHz,
-30dBm per tone
-16
-11
dBm
dBm
Image Rejection
MIXOUT Maximum Voltage Swing
Power-Up Time
f IMAGE = f LO + f IF = 446.4MHz
Standby to RX or TX (Note 3)
25
34
2
5
dB
Vp-p
μs
LIMITING AMPLIFIER AND RSSI (RXEN = high)
V GC = 0.8V (Note 4)
120
160
Limiter Output Level
Phase Variation
Minimum Linear RSSI Range
Minimum Monotonic RSSI Range
RSSI Slope
V GC = open
V GC = 2.0V (P LIMIN = +5dBm)
-75dBm to 5dBm from 50 ?
-75dBm to 5dBm from 50 ?
-80dBm to 10dBm from 50 ?
-75dBm to 5dBm from 50 ?
475
950
1100
3.6
80
90
10.6
625
mVp-p
degrees
dB
dB
mV/dB
RSSI Maximum Intercept
RSSI Relative Error
RSSI Rise Time
(Note 5)
T A = +25°C
T A = -40°C to +85°C (Note 1)
Rise time to within 1dB accuracy; using a 100pF
capacitor from RSSI to GND
-82
±1
6.4
-75
±2
±2.5
dBm
dB
μs
Minimum-Scale RSSI Voltage
Maximum-Scale RSSI Voltage
At LIMIN input of -75dBm
At LIMIN input of 5dBm
50
850
90
940
135
1025
mV
mV
OSCILLATOR (TXEN = RXEN = high)
Frequency Range
Phase Noise
Maximum LO Frequency Pulling
LO Leakage
Oscillator Buffer Output Power
Maximum Power-Up Time
(Note 7)
At 10kHz offset
Standby mode to TX or RX mode
At RXIN port
T A = +25°C (Note 8)
T A = -40°C to +85°C (Notes 1 and 8)
Shutdown to standby mode (Note 9)
200
-12
-13
-88
±36
-65
-9
220
440
MHz
dBc/Hz
kHz
dBm
dBm
μs
_______________________________________________________________________________________
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