Sharp LC-32LE351K (serv.man2) Service Manual ▷ View online
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CIRCUIT DESCRIPTIONS
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2. TUNER
A. SI2156 Terrestrial and Cable TV Tuner:
A.1. Description:
The Si2156 integrates a complete hybrid TV tuner supporting all worldwide terrestrial and
cable TV standards. Leveraging Silicon Labs’ field proven digital low-IF architecture, the
Si2156 maintains the unmatched performance and design simplicity of the Si2153 while
further reducing footprint size and bill of materials cost. No external LNAs, tracking filters,
wirewound inductors, or SAW filters are used.
Compared with competing silicon tuners and discrete MOPLL-based tuners, the Si2156
delivers superior picture quality and a higher number of received stations in crowded and
near/far real-world reception conditions. The high linearity and low noise RF front-end
delivers superior blocking performance and higher sensitivity in the presence of strong
undesired channels and interference.
The Si2156 integrates the complete signal path from antenna input to IF outputs for both
analog and digital transmission standards. Compared to traditional discrete MOPLL-based
tuners, the Si2156 eliminates hundreds of external components including external LNAs,
tracking filter varactors and inductors (unlike competing silicon tuners), and SAW filters,
resulting in the simplest, lowest-cost BOM for a hybrid TV tuner.
Interfacing the Si2156 seamlessly with the Si2165 DVB-T/C demodulator creates a
complete terrestrial and cable DVB-T/C receiver plus PAL/SECAM tuner.
A.2. Features:
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Worldwide hybrid TV tuner
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Analog TV: NTSC, PAL/SECAM
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Digital TV: ATSC/QAM, DVB-T/T2/C, ISDB-T/C, DTMB
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42-1002 MHz frequency range
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Compliance to A/74, NorDig, D-Book, C-Book, ARIB, EN55020, OpenCable™
speci
fications
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Best-in-class real-world reception
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Exceeds discrete MOPLL-based tuners
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Highly integrated, lowest BOM
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No SAW filters or wirewound inductors required
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Integrated LNAs and complete tracking filters
- No alignment, tuning or calibration required
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Digital low-IF architecture
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Integrated channel select filters
- Flexible output interface
- ALIF to analog TV demodulator or SoC
- DLIF to digital TV demodulator or SoC
- 3.3 and 1.8 V power supplies
- Standard CMOS process technology
- 5 x 5 mm, 32-pin QFN package
- ALIF to analog TV demodulator or SoC
- DLIF to digital TV demodulator or SoC
- 3.3 and 1.8 V power supplies
- Standard CMOS process technology
- 5 x 5 mm, 32-pin QFN package
-
RoHS compliant
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- No alignment, tuning or calibration required
- Digital low-IF architecture
- Integrated channel select filters
- Flexible output interface
- ALIF to analog TV demodulator or SoC
- DLIF to digital TV demodulator or SoC
- 3.3 and 1.8 V power supplies
- Standard CMOS process technology
- 5 x 5 mm, 32-pin QFN package
- RoHS compliant
- Digital low-IF architecture
- Integrated channel select filters
- Flexible output interface
- ALIF to analog TV demodulator or SoC
- DLIF to digital TV demodulator or SoC
- 3.3 and 1.8 V power supplies
- Standard CMOS process technology
- 5 x 5 mm, 32-pin QFN package
- RoHS compliant
Figure 1: Pin description
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B. M88TS2022 Satellite Tuner
B.1. Features and General Description
B.2. Pin Assigment
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B.3. Absolute Maximum Ratings and Recommended Operating
Conditions
3. AUDIO AMPLIFIER STAGES
A. MAIN AMPLIFIER (TAS5719)(6-8 W option)
a. General Description
The TAS5717/TAS5719 is a 10-W/15-W, efficient,digital audio-power amplifier for
driving stereo bridge-tied speakers. One serial data input allows processing of up to two
discrete audio channels and seamless integration to most digital audio processors and MPEG
decoders. The device accepts a wide of input data and data rates. A fully programmable data
path routes these channels to the internal speaker drivers.
discrete audio channels and seamless integration to most digital audio processors and MPEG
decoders. The device accepts a wide of input data and data rates. A fully programmable data
path routes these channels to the internal speaker drivers.
The TAS5717/9 is a slave-only device receiving all clocks from external sources. The
TAS5717/TAS5719 operates with a PWM carrier between a 384-kHz switching rate and a
352-KHz switching rate, depending on the input sample rate. Oversampling combined with a
fourth-order noise shaper provides a flat noise floor and excellent dynamic range from 20 Hz
to 20 kHz.
352-KHz switching rate, depending on the input sample rate. Oversampling combined with a
fourth-order noise shaper provides a flat noise floor and excellent dynamic range from 20 Hz
to 20 kHz.
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