AD1848K_15 Datasheet, PDF (1/28 Pages) Analog Devices – Parallel-Port 16-Bit SoundPort Stereo Codec

a
Parallel-Port 16-Bit
SoundPort Stereo Codec
AD1848K
FEATURES
supply. It provides a direct, byte-wide interface to both ISA
Single-Chip Integrated ∑∆ Digital Audio Stereo Codec
(“AT”) and EISA computer buses for simplified implementa-
Supports the Microsoft Windows Sound System®
tion on a computer motherboard or add-in card. The AD1848K
Multiple Channels of Stereo Input
generates enable and direction controls for IC buffers such as
Analog and Digital Signal Mixing
74_245.
Programmable Gain and Attenuation
The AD1848K SoundPort Stereo Codec supports a DMA re-
On-Chip Signal Filters
quest/grant architecture for transferring data with the host com-
OBSOLETE Digital Interpolation
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
Programmed I/O
PRODUCT OVERVIEW
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.
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
interface.
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
(Continued on page 9)
FUNCTIONAL BLOCK DIAGRAM
ANALOG
ANALOG
SUPPLY
DIGITAL
SUPPLY
CRYSTALS
22
POWER DOWN
DIGITAL
L_LINE
R_LINE
L_MIC
R_MIC
L_AUX1
R_AUX1
L_OUT
R_OUT
L_AUX2
R_AUX2
OSCILLATORS
L
20
GAIN
∑∆ A/D
CONVERTER
16
dB
MUX
R
∑∆ A/D
16
GAIN
CONVERTER
GAIN/ATTEN/MUTE
µ/
A
P
L
A
A
R
W
A
DIGITAL
MIX
L
L
2
E
L
8
L
∑
R
∑
ATTEN/
MUTE
ATTEN/
MUTE
ANALOG
FILTER
ANALOG
FILTER
∑∆ D/A
CONVERTER
∑∆ D/A
CONVERTER
P
INTERPOL ATTENUATE ∑
µ/ O
AR
LT
A
2
INTERPOL ATTENUATE
∑
W
GAIN/ATTEN/MUTE
REFERENCE
CONTROL
REGS
2
PLAYBACK REQ
PLAYBACK ACK
CAPTURE REQ
CAPTURE ACK
ADR1:0
DATA7:0
CS
WR
RD
BUS DRIVER
CONTROL
HOST DMA
INTERRUPT
EXTERNAL
CONTROL
2.25V
REV. 0
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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
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