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AD1885JST

AC’97 SoundMAX® Codec

Analog Devices 

a

AC’97 SoundMAX® Codec

AD1885

AC’97 2.1 FEATURES

ENHANCED FEATURES

Variable Sample Rate Audio

Multiple Codec Configuration Options

External Audio Power-Down Control

Full Duplex Variable Sample Rates from 7040 Hz to

48 kHz with 1 Hz Resolution

Jack Sense Pins Provide Automatic Output Switching

AC’97 FEATURES

AC’97 2.1-Compliant

Greater than 90 dB Dynamic Range

Stereo Headphone Amplifier

Multibit ⌺⌬ Converter Architecture for Improved S/N

Ratio Greater than 90 dB

16-Bit Stereo Full-Duplex Codec

Four Analog Line-Level Stereo Inputs for:

Software-Enabled VREFOUT Output for Microphones and

External Power Amp

Split Power Supplies (3.3 V Digital/5 V Analog)

Mobile Low-Power Mixer Mode

Extended 6-Bit Master Volume Control

Extended 6-Bit Headphone Volume Control

Digital Audio Mixer Mode

PHAT™ Stereo 3D Stereo Enhancement

LINE-IN, CD, VIDEO, and AUX

Two Analog Line-Level Mono Inputs for Speakerphone

and PC BEEP

Mono MIC Input w/Built-In 20 dB Preamp, Switchable

from Two External Sources

High Quality CD Input with Ground Sense

Stereo Line-Level Outputs

Mono Output for Speakerphone or Internal Speaker

Power Management Support

48-Terminal LQFP Package

FUNCTIONAL BLOCK DIAGRAM

ID0

ID1

JS0/EAPD JS1

MIC1

MIC2

LINE

AUX

CD

VIDEO

PHONE_IN

MONO_OUT

HP_OUT_L

LINE_OUT_L

AD1885

0dB/

20dB

MMV

⌺

HV

MV

CHIP SELECT

JACK SENSES

AND EAPD CTRL

VREF

PGA

16-BIT

⌺⌬ A/D

CONVERTER

PGA

16-BIT

⌺⌬ A/D

CONVERTER

G

⌺

A

M

POP

⌺

PHAT

STEREO

⌺

G GG G G

⌺

A AA A A

M MM M M

⌺⌺ ⌺ ⌺⌺

SAMPLE

RATE

GENERATORS

NC G

A

M

16-BIT

⌺⌬ D/A

⌺

CONVERTER

VREFOUT

RESET

SYNC

BIT_CLK

SDATA_OUT

SDATA_IN

LINE_OUT_R

MV

HP_OUT_R

HV

PC_BEEP

⌺

PHAT

STEREO

⌺

POP

A

M

⌺⌺⌺ ⌺⌺

G = GAIN

A = ATTENUATE

M = MUTE

MV = MASTER VOLUME

HV = HEADPHONE VOLUME

G

A

NC M

16-BIT

⌺⌬ D/A

⌺

CONVERTER

OSCILLATOR

SoundPort is a registered trademark and PHAT is a trademark of Analog Devices, Inc.

XTL_OUT XTL_IN

REV. 0

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

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

otherwise under any patent or patent rights of Analog Devices.

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

Tel: 781/329-4700 World Wide Web Site: http://www.analog.com

Fax: 781/326-8703

© Analog Devices, Inc., 2000

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