a

SoundPort Controller

AD1812

FEATURES

Compatibility with:

Sound Blaster Pro*

AdLib*

Windows* Sound System

16-Bit

Stereo Codec

MPC Level-2+ Mixer

Dual DMA/Full Duplex Operation

On-Chip FIFO Buffers

Sample Rates from 5.5 kHz to 50 kHz

ADPCM Compression/Decompression

Plug and Play Compliant

Compatible MIDI MPU-401 Port

Integrated Game Port

Free Supporting Software:

Windows 3.1 Driver

Windows 95 Driver

Control Applets

Diagnostics

Power Management Modes

Operation from +5 V Supply

16-Bit Parallel Interface to ISA Bus

24 mA Bus Drive Capability

*Sound Blaster Pro is a trademark of Creative Labs, Ltd.

SoundPort is a registered trademark of Analog Devices, Inc.

PRODUCT OVERVIEW

The AD1812 SoundPort® Controller is a single chip audio sub-

system for adding 16-bit stereo audio to personal computers.

The AD1812 is compatible with Sound Blaster Pro, AdLib, and

the Microsoft* Windows Sound System. The AD1812 provides

an integrated audio solution for enhanced business audio, enter-

tainment sound effects, and multimedia applications.

The AD1812 audio subsystem combines an integrated digital

audio controller, a powerful signal processor, a mixer, and a

16-bit

Σ∆ stereo codec. The DOS games register set, the Win-

dows Sound System register set, music synthesis hardware, an

MPU-401 compatible UART interface, a game port (with

timer), and a Plug and Play ISA interface are all contained on

chip. The on-chip Plug and Play (PnP) routine provides con-

figuration services for the internal logical devices and an exter-

nal modem chipset.

The AD1812 can record compress and playback voice, sound

and music. The system provides all PC 95 audio conversion and

compatibility requirements for a multimedia enabled PC.

(continued on Page 12)

FUNCTIONAL BLOCK DIAGRAM

0dB/

20dB

G

M

G

M

G

M

M

Σ

G

G

M

M

Σ

Σ

Σ

Σ

Σ

Σ

Σ ∆ D/A

CONVERTER

ATTN/

MUTE

Σ ∆ A/D

CONVERTER

PGA

DIGITAL MIX

ATTENUATE

Σ

Σ

FORMAT

FIFO

FORMAT

FIFO

GAME

REGISTER

SET

&

WSS

REGISTER

SET

MIDI _IN

MPU-401 UART

JOYSTICK/GAME PORT INTERFACE

MIDI _OUT

A_1

B_1

A_X

B_X

A_2

B_2

A_Y

B_Y

XTALI/O

PARALLEL

BUS

INTERFACE

CONTROL

REGISTERS

PLUG

AND

PLAY

REGISTERS

ATTN

Σ ∆ D/A

CONVERTER

ADSP-2171

ROM

RAM

MIC

LINE

AUX1

L_OUT

MONO I/O

R_OUT

MONO_IN

AUX2

DACIN

DACOUT

DRQ (0, 1, 3, 5, 6, 7)

IRQ (3, 4, 5, 7, 9, 10, 11, 12)

PC_D (15:0)

PC_A (15:0)

AEN

DACK (0, 1, 3, 5, 6, 7)

IOR

IOW

SBHE

IO_CH16

PWRDWN

PnP

AD1812

MODEM_IRQ

MODEM_SEL

G = GAIN/AMPLIFIER BLOCK

M = MUTE BLOCK

OSCILLATORS

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.

© Analog Devices, Inc., 1996

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

Tel: 617/329-4700

Fax: 617/326-8703