SoundPort Stereo Codec
Single-Chip Integrated ∑∆ Digital Audio Stereo Codec
Supports the Microsoft Windows Sound System®
Multiple Channels of Stereo Input
Analog and Digital Signal Mixing
Programmable Gain and Attenuation
On-Chip Signal Filters
Analog Output Low-Pass
Sample Rates from 5.5 kHz to 48 kHz
68-Lead PLCC and 68-Lead TQFP Packages
Operation from +5 V Supplies
Byte-Wide Parallel Interface to ISA and EISA Buses
Supports One or Two DMA Channels and
The Parallel-Port AD1848K SoundPort® Stereo Codec inte-
grates the key audio data conversion and control functions into
a single integrated circuit. The AD1848K is intended to provide
a complete, single-chip audio solution for business audio and
multimedia applications requiring operation from a single +5 V
SoundPort is a registered trademark of Analog Devices, Inc.
supply. It provides a direct, byte-wide interface to both ISA
(“AT”) and EISA computer buses for simplified implementa-
tion on a computer motherboard or add-in card. The AD1848K
generates enable and direction controls for IC buffers such as
The AD1848K 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
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
External circuit requirements are limited to a minimal number
of low cost support components. Anti-imaging DAC output fil-
ters are incorporated on-chip. 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 ∑∆ 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
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FUNCTIONAL BLOCK DIAGRAM
INTERPOL ATTENUATE ∑
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