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a

FEATURES

5 V Stereo Audio System with 3.3 V Tolerant

Digital Interface

Supports up to 96 kHz Sample Rates

192 kHz Sample Rate Available on 1 DAC

Supports 16-, 20-, 24-Bit Word Lengths

Multibit - Modulators with

Perfect Differential Linearity Restoration for

Reduced Idle Tones and Noise Floor

Data Directed Scrambling DACs鈥擫east

Sensitive to Jitter

Single-Ended Outputs

ADCs: 鈥?5 dB THD + N, 105 dB SNR and

Dynamic Range

DACs: 鈥?2 dB THD + N, 108 dB SNR and

Dynamic Range

On-Chip Volume Controls per Channel with

1024-Step Linear Scale

DAC and ADC Software Controllable Clickless Mutes

Digital De-emphasis Processing

Supports 256 f

S

, 512 f

S

, and 768 f

S

Master

Mode Clocks

Power-Down Mode Plus Soft Power-Down Mode

Flexible Serial Data Port with Right-Justified, Left-

Justified, I

2

S Compatible, and DSP Serial Port

Modes

TDM Interface Mode Supports 8 In/8 Out Using a

Single SHARC

廬

SPORT

52-Lead MQFP Plastic Package

2 ADC, 8 DAC,

96 kHz, 24-Bit - Codec

AD1837A

APPLICATIONS

DVD Video and Audio Players

Home Theater Systems

Automotive Audio Systems

Audio/Visual Receivers

Digital Audio Effects Processors

GENERAL DESCRIPTION

The AD1837A is a high performance single-chip codec featuring

four stereo DACs and one stereo ADC. Each DAC comprises a

high performance digital interpolation filter, a multibit -

modulator featuring Analog Devices鈥?patented technology, and a

continuous-time voltage out analog section. Each DAC has inde-

pendent volume control and clickless mute functions. The ADC

comprises two 24-bit conversion channels with multibit

S-D

modulators and decimation filters.

The AD1837A also contains an on-chip reference with a nominal

value of 2.25 V.

The AD1837A contains a flexible serial interface that allows for

glueless connection to a variety of DSP chips, AES/EBU receivers,

and sample rate converters. The AD1837A can be configured in

left-justified, right-justified, I

2

S, or DSP compatible serial modes.

Control of the AD1837A is achieved by means of an SPI compat-

ible serial port. While the AD1837A can be operated from a single

5 V supply, it also features a separate supply pin for its digital inter-

face, which allows the device to be interfaced to other devices using

3.3 V power supplies.

The AD1837A is available in a 52-lead MQFP package and is speci-

fied for the industrial temperature range of 鈥?0潞C to +85潞C.

FUNCTIONAL BLOCK DIAGRAM

DVDD

DVDD

ODVDD

ALRCLK ABCLK ASDATA

CCLK CLATCH CIN COUT

MCLK

PD/RST M/S

AVDD AVDD

DLRCLK

DBCLK

DSDATA1

DSDATA2

DSDATA3

DSDATA4

SERIAL DATA

I/O PORT

CONTROL PORT

VOLUME

VOLUME

VOLUME

VOLUME

CLOCK

OUTL1

DIGITAL

FILTER

-

DAC

OUTR1

OUTL2

DIGITAL

FILTER

-

DAC

OUTR2

OUTL3

DIGITAL

FILTER

-

DAC

OUTR3

OUTL4

DIGITAL

FILTER

-

DAC

OUTR4

ADCLP

ADCLN

-

ADC

DIGITAL

FILTER

VOLUME

VOLUME

VOLUME

ADCRP

ADCRN

-

ADC

DIGITAL

FILTER

VOLUME

AD1837A

V

REF

FILTD

FILTR

REV. A

DGND

DGND

AGND

AGND

AGND

AGND

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties that

may result from its use. No license is granted by implication or otherwise

under any patent or patent rights of Analog Devices. Trademarks and

registered trademarks are the property of their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

www.analog.com

Fax: 781/326-8703

漏 2004 Analog Devices, Inc. All rights reserved.

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