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PULSUS

PS9604

Stereo, 24-Bit, 192kHz PCM-to-PWM Converter

for Full Digital Power Amplifier

Features

Sampling Frequency: 32kHz to 192kHz

8X Oversampling at 96kHz

4X Oversampling at 192kHz

Input Audio Data Word: 20-, 24-Bit

130 dB Dynamic Range

120 dB SNR (typical)

Variable Modulation Index: 0.5 to 0.875

PWM Switching Frequency: 256~384kHz

Variable PWM Mapping Method: Both Class

AD, BD amplifications are supported

Automatic Sample Rate Detection

System Clock:

2048fs at 48kHz, 1024fs at 96kHz,

512fs at 192kHz

Single 3.3 V Power Supply

28-Lead SOIC Package

Description

The PS9604 is a high performance, stereo, 24-bit,

192kHz PCM-to-PWM converter IC.

The PS9604 uses a state-of-the-art digital signal-

processing algorithm to convert input PCM signal to

PWM format without sacrificing the quality of audio

signal.

The PS9604 can be used with various 8X

oversampling digital filters, for example, DF1704,

SM5847, and PMD200. It can be set up to use

different modulation indices and PWM mapping

methods.

The PS9604鈥檚 excellent SNR and ultra-low

distortion makes it suitable for a size-sensitive

consumer power amplifier application where high

performance is required, such as high-quality AV

receiver, digital TV, and hi-fi amplifiers. A high-end

quality full-digital amplifier can be built using the

PS9604, with minimal cost.

Application Block Diagram

MOD-INDEX [1:0]

EL

24/20BIT

NS_MODE

IM

MUTE

PWM

Modulator

PWM

Modulator

IN

PWM_MAP [1:0]

PWM_L+

PWM_L-

PWM_R+

PWM_R-

Power Supply

V

SS

V

DD

A

Gate

Driver

PR

BCLK

WCLK

LDATA

RDATA

R

Y

H Bridge

Serial

Input

Interface

Multi-bit

Delta-Sigma

Modulator

Gate

Driver

REF_CLK

FS_CLK

192K

96K

SF1

SF0

Sample

Rate

Detector

Timing

Generator

RESET

SYSCLK

Copyright 漏 Pulsus Technologies Inc. 2000

1

AUGUST 2000 REV0.4

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