VESTEL 17MB82S, Service Manual

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1. TUNER(MXL601)
MxL601 is a highly integrated low-power silicon tuner IC targeting all global analog and
digital cable standards as well as digital terrestrial reception standards. Broadband input
filtering and channel filtering have been completely integrated on-chip. This integration
enables a very compact design requiring a small footprint, low bill-of-materials cost, and low
power
consumption. A signal at the 753 RF input is filtered and converted to a programmable IF
output up to 44MHz. Automatic gain control, LO generation, and channel selectivity
functions are completely integrated on the chip, which simplifies boardlevel design. All
functions of the IC can be controlled via I2C interface. MxL601 is available in a 4 x 4 mm2
24-pin QFN package.
Features :
 Tuning range from 44MHz to 1002MHz
 Programmable channel bandwidths of 6, 7,and 8MHz
 Integrated channel filtering requiring noexternal SAW filter for digital applications
 Low power consumption with 3.3V and1.8V dual-supply operation351 mW (Digital
Terrestrial)
 On-chip voltage regulator enables singlesupply 3.3V operation

Programmable IF frequency and IF spectrum inversion
 Reference clock output available for re-use by demodulators and additional tuners in
multi-channel applications

Input power reporting
 General purpose open-drain output GPO available for controlling off-chip circuitry
 Integrated on-chip programmable loading capacitors for the reference crystal
 I2C-compatible digital control interface
 RoHS compliance
BLOCK DIAGRAM