® PCM1F479P2%O1
PCM1721
TM Stereo Audio
DIGITAL-TO-ANALOG CONVERTER
WITH PROGRAMMABLE PLL
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:
256fS/384fS from 27MHz Master Clock
q NORMAL OR I2S DATA INPUT FORMATS
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
256fS or 384fS system clock from an external 27MHz
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
24-bit input data in either normal or I2S formats.
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.
BCKIN
LRCIN
DIN
ML
MC
MD
RSTB
Serial
Input
I/F
Mode
Control
I/F
8X Oversampling
Digital Filter
with Function
Controller
Multi-level
Delta-Sigma
Modulator
Multi-level
Delta-Sigma
Modulator
256fS/384fS
BPZ-Cont.
Clock/OSC Manager and PLL
DAC
DAC
Low-pass
Filter
Low-pass
Filter
Open Drain
Power Supply
VOUTL
CAP
VOUTR
ZERO
SCKI
MCKI
SCKO
VCP PGND VCC AGND VDD DGND
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-11319A
PPCrintMed 1in 7U.2S.A1. August, 1996
®
