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