AD1846 Analog Devices, AD1846 Datasheet

AD1846

Manufacturer Part Number

AD1846

Description

Low Cost Parallel-port 16-bit Soundport Stereo Codec

Manufacturer

Analog Devices

Datasheet

1.AD1846.pdf (28 pages)

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PRODUCT OVERVIEW

The Parallel-Port AD1846 SoundPort

key audio data conversion and control functions into a single in-

tegrated circuit. The AD1846 is intended to provide a complete,

single-chip audio solution for business audio and multimedia

applications requiring operation from a single +5 V supply.

*Windows Sound System is a trademark of Microsoft Corp.

REV. A

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.

SoundPort is a registered trademark of Analog Devices, Inc.

FEATURES

Low Cost, Pin- and Register-Compatible Alternative to

Single-Chip Integrated

Supports the Microsoft Windows Sound System*

Multiple Channels of Stereo Input and Output

Analog and Digital Signal Mixing

Programmable Gain and Attenuation

On-Chip Signal Filters

Sample Rates from 5.5 kHz to 48 kHz

68-Lead PLCC Package

Operation from +5 V Supply

Byte-Wide Parallel Interface to ISA and EISA Buses

Supports One or Two DMA Channels and

AD1848

Digital Interpolation and Decimation

Analog Output Low-Pass

Programmed I/O

ANALOG

R_AUX1

R_AUX2

L_AUX1

L_AUX2

R_OUT

L_LINE

L_OUT

R_LINE

R_MIC

L_MIC

ANALOG

GAIN/ATTEN/

SUPPLY

GAIN/ATTEN/

MUTE

ATTEN/

MUTE

Digital Audio Stereo Codec

MUX

Stereo Codec integrates

ANALOG

FILTER

GAIN

FUNCTIONAL BLOCK DIAGRAM

REFERENCE

CONVERTER

REF

AD1846

D/A

A/D

DIGITAL

SUPPLY

INTERPOL

It provides a direct, byte-wide interface to both ISA (“AT”) and

EISA computer buses for simplified implementation on a com-

puter motherboard or add-in card. The AD1846 generates en-

able and direction controls for IC buffers such as the 74_245.

The AD1846 SoundPort Stereo Codec supports a DMA re-

quest/grant architecture for transferring data with the host com-

puter bus. One or two DMA channels can be supported.

Programmed I/O (PIO) mode is also supported for control reg-

ister accesses and for applications lacking DMA control. Two

input control lines support mixed direct and indirect addressing

of twenty-one internal control registers over this asynchronous

interface.

External circuit requirements are limited to a minimal number

of low cost support components. Anti-imaging DAC output

filters are incorporated on-chip. DAC dynamic range exceeds

80 dB over the 20 kHz audio band. Sample rates from 5.5 kHz

to 48 kHz are supported from external crystals.

The Codec includes a stereo pair of

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

Tel: 617/329-4700

verters and a stereo pair of

puts to the ADC can be selected from four stereo pairs of analog

signals: line, microphone (“mic”), auxiliary (“aux”) line #1, and

post-mixed DAC output. A software-controlled programmable

gain stage allows independent gain for each channel going into

the ADC. The ADCs’ output can be digitally mixed with the

DACs’ input.

Low Cost Parallel-Port 16-Bit

ATTENUATE

OSCILLATORS

CRYSTALS

SoundPort Stereo Codec

DIGITAL

MIX

CONTROL

REGS

POWER DOWN

digital-to-analog converters. In-

analog-to-digital con-

(Continued on page 9)

AD1846

CAPTURE REQ

CAPTURE ACK

ADR1:0

DATA7:0

BUS DRIVER

CONTROL

HOST DMA

INTERRUPT

EXTERNAL

CONTROL

PLAYBACK REQ

PLAYBACK ACK

DIGITAL

Fax: 617/326-8703

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