Sharp LC-24LE250EK (serv.man4) Service Manual ▷ View online
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LC-22LE250
LC-24LE250
5
- 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
Figure 1: Pin description
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LC-24LE250
LC-22LE250
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LC-22LE250
LC-24LE250
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.
b. Features
• Audio Input/Output
• TAS5717 Supports 2×10 W and TAS5719 Supports 2×15 W Output
• Wide PVDD Range, From 4.5 V to 26 V
• Efficient Class-D Operation Eliminates Need for Heatsinks
• Requires Only 3.3 V and PVDD
• One Serial Audio Input (Two Audio Channels)
• I2C Address Selection via PIN (Chip Select)
• Supports 8-kHz to 48-kHz Sample Rate (LJ/RJ/I2S)
• External Headphone-Amplifier Shutdown Signal
• Integrated CAP-Free Headphone Amplifier
• Stereo Headphone (Stereo 2-V RMS Line Driver) Outputs
• Audio/PWM Processing
• Independent Channel Volume Controls With 24-dB to Mute
• Programmable Two-Band Dynamic Range Control
• 14 Programmable Biquads for Speaker EQ
• Programmable Coefficients for DRC Filters
• DC Blocking Filters
• 0.125-dB Fine Volume Support
• General Features
• Serial Control Interface Operational Without MCLK
• Factory-Trimmed Internal Oscillator for Automatic Rate Detec
• Surface Mount, 48-Pin, 7-mm × 7-mm HTQFP Package
• AD, BD, and Ternary PWM-Mode Support
• Thermal and Short-Circuit Protection
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LC-24LE250
LC-22LE250
•Benefits
EQ: Speaker Equalization Improves Audio Performance
DRC: Dynamic Range Compression. Can Be Used As Power Limiter. Enables
DRC: Dynamic Range Compression. Can Be Used As Power Limiter. Enables
Speaker Protection, Easy Listening, Night-Mode Listening.
DirectPath Technology: Eliminates Bulky DC Blocking Capacitors
Stereo Headphone/Stereo Line Drivers: Adjust Gain via External Resistors,
Stereo Headphone/Stereo Line Drivers: Adjust Gain via External Resistors,
Dedicated Active Headpone Mute Pin, High Signal-to-Noise Ratio.
Two-Band DRC: Set Two Different Thresholds for Low-and High-Frequency
Content.
c. Pin descriptions and functions:
Figure 2: Pin description
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