Datasheet

MAX2121
Complete Direct-Conversion L-Band Tuner
3
PARAMETER CONDITIONS MIN TYP MAX UNITS
MAIN SIGNAL PATH PERFORMANCE
Minimum Gain f
IN
= 2175MHz 72 78 dB
Gain Flatness 925MHz to 2175MHz (Note 2) 4 6 dB
Input Frequency Range (Note 3) 925 2175 MHz
RF Gain-Control Range (GC1) 0.5V < V
GC1
< 2.7V 65 73 dB
Baseband Gain-Control Range Bits BBG[3:0] = 1111 to 0000 11.5 13.5 dB
In-Band Input IP3 (Note 4) +2 dBm
Out-of-Band Input IP3 (Note 5) +15 dBm
Input IP2 (Note 6) +40 dBm
V
GC1
is set to 0.5V (maximum RF gain) and BBG[3:0]
is adjusted to give a 1V
P-P
baseband output level for a
-75dBm CW input tone at 1500MHz
8
Noise Figure
Starting with the same BBG[3:0] setting as above,
V
GC1
is adjusted to back off RF gain by 10dB (Note 2)
9 12
dB
Minimum RF Input Return Loss 925MHz < f
RF
< 2175MHz, in 75 system 12 dB
BASEBAND OUTPUT CHARACTERISTICS
Nominal Output Voltage Swing R
LOAD
= 200//5pF 0.5 1 V
P-P
I/Q Amplitude Imbalance Measured at 500kHz ±1 dB
I/Q Quadrature Phase Imbalance Measured at 500kHz 3.5 Degrees
Single-Ended I/Q Output
Impedance
Real Z
O
, from 1MHz to 140MHz 24 
Output 1dB Compression Voltage Differential 3 V
P-P
Baseband Highpass -3dB
Frequency Corner
47nF capacitors at IDC_, QDC_ 400 Hz
BASEBAND LOWPASS FILTERS (5th-Order Butterworth with 1st-Order Group Delay Compensation)
Filter Bandwidth (-3dB) 123.75 MHz
Rejection Ratio At 247.5MHz 31 dB
Group Delay Up to 0.5dB bandwidth 1.0 ns
3dB Bandwidth Tolerance ±10 %
FREQUENCY SYNTHESIZER
RF-Divider Frequency Range 925 2175 MHz
RF-Divider Range (N) 19 251
Reference-Divider Frequency
Range
12 30 MHz
Reference-Divider Range (R) 1 1
Phase-Detector Comparison
Frequency
12 30 MHz
AC ELECTRICAL CHARACTERISTICS
(MAX2121 Evaluation Kit: V
CC
= +3.13V to +3.47V, T
A
= -40°C to +85°C, default register settings except BBG[3:0] = 1111. Typical
values measured at V
CC
= +3.3V, T
A
= +25°C, unless otherwise noted.) (Note 1)