Stereo Audio

DIGITAL-TO-ANALOG CONVERTER

with VCXO and PLL

PCM1740

FEATURES

q COMPLETE DELTA-SIGMA STEREO DAC

q VOLTAGE-CONTROLLED CRYSTAL OSCILLATOR:

27MHz

±150ppm Output with 0V to 3V Input

q PROGRAMMABLE PLL

256fS or 384fS Audio System Clock Output

q DYNAMIC PERFORMANCE:

Dynamic Range: 94dB

SNR: 94dB

THD+N: –89dB

q SAMPLING FREQUENCIES:

16kHz, 22.05kHz, 24kHz

32kHz, 44.1kHz, 48kHz

64kHz, 88.2kHz, 96kHz

q SERIAL AUDIO INTERFACE:

Standard or I2S™ Data Formats

16-, 20-, or 24-Bit Data

q I2C-BUS™ INTERFACE FOR CONTROL

REGISTERS:

Slave Receiver Operation

7-Bit Addressing

Standard Transfer Rate (up to 100kbps)

q PROGRAMMABLE CONTROLS:

Digital Attenuation (256 steps)

Soft Mute

Infinite Zero Detect Mute

De-Emphasis (32kHz, 44.1kHz, 48kHz)

DAC Output Mode

q SINGLE +5V SUPPLY

q SMALL SSOP-24 PACKAGE

TM

DESCRIPTION

The PCM1740 is a complete stereo audio digital-to-

analog converter with on-chip PLL and VCXO. The

PCM1740 is designed specifically for set-top box applica-

tions requiring high-quality audio playback, a precision

tuned 27MHz master clock source, and support for mul-

tiple audio-sampling frequencies.

The stereo digital-to-analog converter (DAC) uses multi-

bit, delta-sigma architecture, which includes an 8x inter-

polation filter, 3rd-order noise shaping, 5-level amplitude

quantization, and an analog low-pass filter. The PCM1740

includes a number of user-programmable functions, which

are accessed via a standard I2C-Bus interface.

APPLICATIONS

q SET-TOP BOXES

q DIGITAL BROADCAST RECEIVERS

PCM

1740

PCM

Audio

I/F

I2C

I/F

and

REGs

VCXO

SCL

SDA

AD1

AD0

XTUN

XT1

XT2

RST

27MHz

Crystal

8x

Oversampling

Digital Filter

and

Sub-Functions

Process

DAC

(R)

Counter N

V

OUTL

V

COM

ZERO

SCKO

(256f

S / 384fS)

MCKO

(27MHz)

V

OUTR

Counter M

Power Supply

Reset

BCK

LRCK

DATA

Phase

Detector

V

PP

AGND

DGND

V

CC

V

DD

PGND

DAC

(L)

Low-Pass

Filter

and Amp

LPF

VCO

SBAS128B – JANUARY 2000 – REVISED MAY 2007

www.ti.com

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

Copyright © 2000-2007, Texas Instruments Incorporated

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

SoundPLUS is a trademark of Texas Instruments.

I2C-Bus, I2C, and I2S are trademarks of NXP B.V.

All other trademarks are the property of their respective owners.