Sharp LC-32SH25E Service Manual page 43

Table of Contents

1.4. U600 (TDA8933BTW HTSSOP32)

General description

The TDA8933B is a high-efficiency class D amplifier with low power dissipation.

The continuous-time output power is 2 × 10 W in a stereo half-bridge application (R

to the low power dissipation the device can be used without any external heat sink when playing music. Due to the implementation of thermal foldback(TF)

the device remains operating with considerable music output power without the need for an external heat sink, even for high supply voltages and/or lower

load impedances.

The device has two full differential inputs driving two independent outputs. It can be used in a mono full-bridge configuration (Bridge-Tied Load(BTL)) or as

stereo half-bridge configuration (Single-Ended(SE)).

Features

· Operating voltage from 10 V to 36 V asymmetrical or ±5 V to ±18 V symmetrical

· Mono bridge-tied load (full-bridge) or stereo single-ended (half-bridge) application

· Application without heat sink using thermally enhanced small-outline package

· High efficiency and low-power dissipation

· Thermal foldback to avoid audio holes

· Current limiting to avoid audio holes

· Full short-circuit proof across load and to supply lines (using advanced current protection)

· Switchable internal or external oscillator (master-slave setting)

· No pop noise

· Full differential inputs

Applications

· Flat-panel television sets

· Flat-panel monitor sets

· Multimedia systems

· Wireless speakers

· Mini/micro systems

· Home sound sets

1.5. U602 (WM8521H9GED/RV SOIC-14)

DESCRIPTION

The WM8521 is a 96kHz stereo DAC with an integrated output op-amp stage, designed to generate a 2.0Vrms output signal directly, so reducing external

component requirements in digital audio applications.

WM8521 comes into two variants WM8521HC and WM8521H9 which offers different line drive output capabilities. WM8521HC outputs 2Vrms at 12V

supply, while WM8521H9 outputs 2.0Vrms at 9V supply. WM8521HC/H9 are designed for cost sensitive consumer digital audio applications requiring

2Vrms line output.

A 24-bit multi-bit sigma delta DAC is used with oversampling digital interpolation filters. Digital audio input word lengths from 16-32 bits and sampling rates

from 8kHz to 96kHz are supported.

The audio interface supports I

The devices are controlled via a hardware interface which provides access to features including de-emphasis, mute and data formats. These devices are

pin equivalent and are available in a 14-pin SOIC package.

FEATURES

· Audio Performance

- DAC SNR 98dB ('A' weighted @ 48kHz)

- THD -81dB ('A' weighted @ 48kHz)

· DAC Sampling Frequency: 8kHz – 96kHz

· Pin Selectable Audio Data Interface Format

- I

S, 16-bit Right Justified or 16bit DSP