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Low Cost Parallel-Port 16-Bit SoundPort Stereo Codec AD1846 It provides a direct, byte-wide interface to both ISA (“AT”) and EISA computer buses for simplified implementation on a computer motherboard or add-in card. The AD1846 generates enable and direction controls for IC buffers such as the 74_245.

FEATURES Low Cost, Pin- and Register-Compatible Alternative to AD1848 Single-Chip Integrated ∑∆ Digital Audio Stereo Codec 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 Digital Interpolation and Decimation Analog Output Low-Pass 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 Programmed I/O

The AD1846 SoundPort Stereo Codec supports a DMA request/grant architecture for transferring data with the host computer bus. One or two DMA channels can be supported. Programmed I/O (PIO) mode is also supported for control register 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. Antimaging 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.

PRODUCT OVERVIEW

The Parallel-Port AD1846 SoundPort® Stereo Codec integrates key audio data conversion and control functions into a single integrated 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. SoundPort is a registered trademark of Analog Devices, Inc.

The Codec includes a stereo pair of ∑∆ analog-to-digital converters and a stereo pair of ∑∆ digital-to-analog converters. Inputs 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. (Continued on page 9)

FUNCTIONAL BLOCK DIAGRAM

ANALOG

DIGITAL SUPPLY

ANALOG SUPPLY

CRYSTALS

L_LINE

DIGITAL

OSCILLATORS

R_LINE

L

L_MIC

GAIN

R_MIC

∑∆ A/D CONVERTER

PLAYBACK REQ 16

µ/ A L A W

MUX

L_AUX1

R GAIN

R_AUX1

∑∆ A/D CONVERTER

16

AD1846

DIGITAL MIX

GAIN/ATTEN/ MUTE L L_OUT

R

ATTEN/ MUTE

ANALOG FILTER

∑∆ D/A CONVERTER

ATTEN/ MUTE

ANALOG FILTER

∑∆ D/A CONVERTER

R_OUT

L_AUX2

GAIN/ATTEN/ MUTE

R_AUX2

POWER DOWN

REFERENCE

INTERPOL

INTERPOL

ATTENUATE

ATTENUATE

µ/ A L A W

CONTROL REGS

P A R A L L E L P O R T

PLAYBACK ACK CAPTURE REQ CAPTURE ACK ADR1:0 DATA7:0 CS WR RD BUS DRIVER CONTROL HOST DMA INTERRUPT EXTERNAL CONTROL

VREF

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.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703


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