AD1845 Analog Devices, AD1845 Datasheet
AD1845
Manufacturer Part Number
AD1845
Description
Parallel-port 16-Bit Soundport Stereo Codec
Manufacturer
Analog Devices
Datasheet
1.AD1845.pdf
(40 pages)
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a
PRODUCT OVERVIEW
The Parallel Port AD1845 SoundPort® Stereo Codec integrates
key audio data conversion and control functions into a single in-
tegrated circuit. The AD1845 provides a complete, single chip
computer audio solution for business audio and multimedia ap-
plications. The codec includes stereo audio converters, com-
plete on-chip filtering, MPC Level-2 compliant analog mixing,
*Microsoft is a registered trademark of Microsoft Corporation.
SoundPort is a registered trademark of Analog Devices, Inc.
REV. B
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.
Windows is a trademark of Microsoft Corporation.
FEATURES
Single-Chip Integrated
Microsoft* and Windows* Sound System Compatible
MPC Level-2+ Compliant Mixing
16 mA Bus Drive Capability
Supports Two DMA Channels for Full Duplex Operation
On-Chip Capture and Playback FIFOs
Advanced Power-Down Modes
Programmable Gain and Attenuation
Sample Rates from 4.0 kHz to 50 kHz Derived from a
68-Lead PLCC, 100-Lead TQFP Packages
Operation from +5 V Supplies
Byte-Wide Parallel Interface to ISA and EISA Buses
Pin Compatible with AD1848, AD1846, CS4248, CS4231
Single Clock or Crystal Input
ANALOG
R_AUX1
L_AUX1
R_AUX2
L_AUX2
R_LINE
L_LINE
L_OUT
M_OUT
R_OUT
R_MIC
L_MIC
M_IN
0 dB/
20 dB
MUTE
ANALOG SUPPLY
Digital Audio Stereo Codec
GAM
GAM
GAM
DIGITAL SUPPLY
FUNCTIONAL BLOCK DIAGRAM
GAM
GAM
L
R
GAM = GAIN
ATTENUATE
ATTENUATE
M
U
X
MUTE
MUTE
L
R
ATTENTUATE
MUTE
GAIN
GAIN
FREQUENCY GENERATOR
VARIABLE SAMPLE
CLOCK SOURCE
programmable gain, attenuation and mute, a variable sample
frequency generator, FIFOs, and supports advanced power-
down modes. It provides a direct, byte-wide interface to both
ISA (“AT”) and EISA computer buses for simplified implemen-
tation on a computer motherboard or add-in card.
The AD1845 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 thirty-seven internal control registers over this asynchronous
interface. The AD1845 includes dual DMA count registers for
full duplex operation enabling the AD1845 to capture data on
one DMA channel and play back data on a separate channel.
The FIFOs on the AD1845 reduce the risk of losing data when
making DMA transfers over the ISA/EISA bus. The FIFOs
buffer data transfers and allow for relaxed timing in acknowl-
edging requests for capture and playback data.
External circuit requirements are limited to a minimal number
of low cost support components. Anti-imaging DAC output
filters are incorporated on-chip. Dynamic range exceeds 80 dB
over the 20 kHz audio band. Sample rates from 4 kHz to 50 kHz
are supported from a single external crystal or clock source.
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
Tel: 617/329-4700
CONVERTER
CONVERTER
V
REFERENCE
REF_F
CONVERTER
CONVERTER
D/A
D/A
A/D
A/D
V
REF
DIGITAL MIX
ATTENUATE
SoundPort Stereo Codec
POWER DOWN
LINEAR
LINEAR
A-LAW
µ-LAW
A-LAW
µ-LAW
Parallel-Port 16-Bit
AD1845
RESET
FIFO
FIFO
REGISTERS
CONTROL
© Analog Devices, Inc., 1996
P
A
R
A
E
P
O
R
L
L
L
T
(Continued on Page 9)
AD1845
Fax: 617/326-8703
PLAYBACK REQ
HOST DMA
INTERRUPT
EXTERNAL
CONTROL
PLAYBACK ACK
CAPTURE REQ
CAPTURE ACK
ADR1:0
DATA7:0
CS
RD
WR
BUS DRIVER
CONTROL
DIGITAL
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