®

1

PCM1721

Serial

Input

I/F

Mode

Control

I/F

8X Oversampling

Digital Filter

with Function

Controller

Clock/OSC Manager and PLL

SCKI

256f

V

CP

PGND V

CC

AGND

Multi-level

Delta-Sigma

Modulator

V

CAP

Open Drain

DAC

Multi-level

Delta-Sigma

Modulator

Low-pass

Filter

Low-pass

Filter

BPZ-Cont.

V

ZERO

DAC

MC

MD

ML

LRCIN

DIN

BCKIN

RSTB

Power Supply

MCKI

SCKO

V

DD

DGND

Stereo Audio

DIGITAL-TO-ANALOG CONVERTER

WITH PROGRAMMABLE PLL

TM

49%

FPO

PCM1721

®

FEATURES

q ACCEPTS 16-, 20-, OR 24-BIT INPUT DATA

q COMPLETE STEREO DAC: Includes Digital

Filter and Output Amp

q DYNAMIC RANGE: 94dB

q MULTIPLE SAMPLING FREQUENCIES:

16kHz, 22.05kHz, 24kHz

32kHz, 44.1kHz, 48kHz

64kHz, 88.2kHz, 96kHz

q PROGRAMMABLE PLL CIRCUIT:

q SELECTABLE FUNCTIONS:

Soft Mute

Digital Attenuator (256 Steps)

Digital De-emphasis

q OUTPUT MODE: Left, Right, Mono, Mute

DESCRIPTION

The PCM1721 is a complete low cost stereo audio

digital-to-analog converter (DAC) with a phase-locked

loop (PLL) circuit included. The PLL derives either

256f

reference frequency. The DAC contains a 3rd-order

∆Σ

modulator, a digital interpolation filter, and an analog

output amplifier. The PCM1721 can accept 16-, 20-, or

The digital filter performs an 8X interpolation func-

tion and includes selectable features such as soft mute,

digital attenuation and digital de-emphasis. The PLL

can be programmed for sampling at standard digital

audio frequencies as well as one-half and double

sampling frequencies.

The PCM1721 is ideal for applications which combine

compressed audio and video data such as DVD, DVD-

ROM, set-top boxes and MPEG sound cards.

PCM1721

International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111 • Twx: 910-952-1111

Internet: http://www.burr-brown.com/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132

© 1996 Burr-Brown Corporation

PDS-1319A

Printed in U.S.A. August, 1996