Datasheet

Complete, Direct-Conversion
Tuner for DVB-S2 Applications
PARAMETER CONDITIONS MIN TYP MAX UNITS
MAIN SIGNAL PATH PERFORMANCE
Input Frequency Range (Note 2) 925 2175 MHz
RF Gain-Control Range (GC1) 0.5V < V
GC1
< 2.7V 65 73 dB
Baseband Gain-Control Range Bits GC2 = 1111 to 0000 13 15 dB
In-Band Input IP3 (Note 3) +2 dBm
Out-of-Band Input IP3 (Note 4) +15 dBm
Input IP2 (Note 5) +40 dBm
Adjacent Channel Protection (Note 6) 25 dB
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 7)
912
dB
Minimum RF Input Return Loss 925MHz < f
RF
< 2175MHz, in 75Ω system 12 dB
BASEBAND OUTPUT CHARACTERISTICS
Nominal Output Voltage Swing R
LOAD
= 2kΩ//10pF 0.5 1 V
P-P
I/Q Amplitude Imbalance Measured at 500kHz; filter set to 22.27MHz ±1 dB
I/Q Quadrature Phase Imbalance Measured at 500kHz; filter set to 22.27MHz 3.5 D eg r ees
S i ng l e- E nd ed I/Q Outp ut Im p ed ance Real Z
O
, from 1MHz to 40MHz 30 Ω
Output 1dB Compression Voltage Differential 3 V
P-P
Baseband Highpass -3dB
Frequency Corner
47nF capacitors at IDC_, QDC_ 400 Hz
BASEBAND LOWPASS FILTERS
Filter Bandwidth Range 4 40 MHz
Rejection Ratio At 2 x f
-3dB
39 dB
Group Delay Up to 1dB bandwidth 37 ns
Ratio of In-Filter-Band to Out-of-
Filter-Band Noise
f
INBAND
= 100Hz to 22.5MHz, f
OUTBAND
= 87.5MHz to
112.5MHz
25 dB
FREQUENCY SYNTHESIZER
RF-Divider Frequency Range 925 2175 MHz
RF-Divider Range (N) 19 251
Refer ence- D i vi d er Fr eq uency Rang e 12 30 MHz
Reference-Divider Range (R) 1 1
Phase-Detector Comparison
Frequency
12 30 MHz
VOLTAGE-CONTROLLED OSCILLATOR AND LO GENERATION
Guaranteed LO Frequency Range 925 2175 MHz
f
OFFSET
= 10kHz -97
f
OFFSET
= 100kHz -100LO Phase Noise
f
OFFSET
= 1MHz -122
dBc/Hz
AC ELECTRICAL CHARACTERISTICS
(MAX2112 Evaluation Kit: V
CC
= +3.13V to +3.47V, T
A
= 0°C to +70°C (MAX2112CTI+), T
A
= -40°C to +85°C (MAX2112ETI+), default
register settings except BBG[3:0] = 1011. Typical values measured at V
CC
= +3.3V, T
A
= +25°C.) (Note 1)
MAX2112
Maxim Integrated
3