MAX2102 データシートの表示（PDF） - Maxim Integrated
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MAX2102 Datasheet PDF : 16 Pages
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Direct-Conversion Tuner ICs for
Digital DBS Applications
The quadrature downconverter follows the front-end
AGC. Two mixers are driven by the previous stage
AGC amplifier output. The mixer LO ports are fed with
the two LO signals, which are 90° apart in phase.
These quadrature LO signals are generated on-chip
using the LO signal from the LO buffer.
The resulting I/Q baseband signals are fed through
separate I and Q channel baseband amplifiers. Robust
output stages drive IOUT and QOUT. The outputs are
capable of driving lowpass filters with 100Ω character-
istic impedance (that is, the equivalent of an AC-cou-
pled, 100Ω load). The baseband -3dB output band-
width is over 90MHz.
__________Applications Information
Front-End Tuner Circuitry
for DBS Tuners
In a typical application, the signal path ahead of the
MAX2102/MAX2105 will include a discrete LNA/buffer
and a PIN-diode attenuator. Alternatively, a dual-gate
LNB
KU BAND
75Ω CABLE
950MHz to 2150MHz
F-CONNECTOR
FOR 2nd SET-TOP BOX
F-CONNECTOR
INPUT
OR
EXTERNAL
VCO
TANK
OR
TSA5055
OR EQUIV.
AGC
RFIN
IOUT 0.1µF RS
C1
RFIN
LO
LO
0 MAX2102
90 MAX2105
DIV
OFFSET CORRECTION
QOUT
0.1µF RS
C1
IDC IDC QDC QDC PSOUT
MOD
L1
L2
L3
0.1µF
C2
C3
C4
AGC
ADC
BASEBAND LP FILTERS
L1
L2
L3
C2
C3
C4
RL
(OPTIONAL
GAIN)
0.1µF
MAX1002
MAX1003
ADC
DSP:
QPSK
DEMOD
RL
Figure 2. Typical Application
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