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AD1843JS Datasheet

  • AD1843JS

  • Serial-Port 16-Bit SoundComm Codec

  • 848.52KB

  • 64頁(yè)

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a
Serial-Port 16-Bit
SoundComm Codec
AD1843
FEATURES
GENERAL PRODUCT DESCRIPTION
Single Chip Integrated Speech, Audio, Fax and Modem
The AD1843 SoundComm鈩?Codec is a complete analog front
Codec
end for high performance DSP-based telephony and audio ap-
Highly Configurable Stereo
鈭戔垎
ADCs and Quad
鈭戔垎
DACs
plications. The device integrates the real-world analog I/O re-
Supports V.34, V.32bis, and Fallback Modem Standards
quirements for many popular functions thereby reducing size,
As Well As Voice Over Data
power consumption, and system complexity. The AD1843
Dual Digital Resamplers with Programmable Input and
SoundComm is the world鈥檚 first codec which can support four
Output Phase and Frequency
different sample rates simultaneously, without any beat fre-
Three On-Chip Phase Lock Loops for Synchronization to
quency noise issues. This is essential for highly integrated audio/
External Signals, Including Video
modem/fax products since the sample rates associated with au-
Thirteen Analog Inputs and Seven Analog Outputs
dio are very much distinct from the sample rates associated with
Advanced Analog and Digital Signal Mixing and Digital-
telephony-oriented data communication. It is also the first codec
to-Digital Sample Rate Conversion
to offer on-chip digital phase lock loops for sample rate synchro-
Programmable Gain, Attenuation and Mute
nization to external clock signals. This sample rate flexibility is
On-Chip Signal Filters
enabled through Analog Devices鈥?Continuous Time Oversampling
Digital Interpolation and Decimation
(CTO) technology.
Analog Output Low Pass
The main elements of the AD1843 are its extensive input and mix-
1 Hz Resolution Programmable Sample Rates from 4 kHz
ing section, its two channels of sigma-delta (鈭戔垎) analog-to-digital
to 54 kHz Derived from a Single Clock Input
conversion, its four channels of
鈭戔垎
digital-to-analog conversion, its
80-Lead PQFP and 100-Lead TQFP Packages
digital filters, and the clock and control circuitry for implementing
Operation from +5 V or Mixed +5 V/+3 V Supplies
the device鈥檚 different modes. The AD1843 permits flexible sample-
FIFO-Buffered Serial Digital Interface Compatible with
rate selection through programming and external synchronization,
ADSP-21xx Fixed-Point DSPs
many input and output options, and many mixing options.
Advanced Power Management
(continued on page 11)
VHDL Model of Serial Port Available; Evaluation Board
SoundComm is a trademark of Analog Devices, Inc.
and MAFE Board Available
SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM
SYNC
3
LIN
MIC
AUX1
AUX2
AUX3
MIN
4
20 dB
2
2
2
2
1
XTAL CONV
2
3
BIT
3
AD1843
S
E
L
E
C
T
O
R
PGA
鈭戔垎
ADC
S
E
L
E
C
T
O
R
鈭戔垎
DAC
S
E
L
E
C
T
O
R
CLOCK GENERATION
CONTROL
REGISTERS
CLKOUT
碌/A
LAW
ADC
D
I
G
I
T
A
L
SCLK
SDFS
SDI
SDO
BM
CS
TSO
TSI
2
XCTL [1:0]
PDMNFT
RESET
PWRDWN
MUTE
MOUT
MUTE
LOUT1
2
鈭?/div>
DRIVER
MUTE
MUTE
HPOUTL
HPOUTC
HPOUTR
LOUT2
SUM
GAM = GAIN
ATTENUATION
MUTE
LEFT AND
RIGHT CHANNELS
VOLTAGE REFERENCE
GAM
GAM
GAM
GAM
GAM
GAM
ATTN
MUTE
鈭?/div>
鈭?/div>
鈭?/div>
鈭?/div>
GAM
鈭?/div>
MUTE
LEFT AND
RIGHT CHANNELS
GAM
M
U
T
E
ATTN
鈭?/div>
FIFO
碌/A
LAW
DAC1
I
N
T
E
R
F
A
C
E
ATTN
MUTE
鈭戔垎
DAC
鈭?/div>
M
U
T
E
MUTE
鈭?/div>
碌/A
LAW
4
2
ATTN
FIFO
DAC2
4
3
V
CC
8
GNDD
9
V
DD
REV. 0
V
REF
CMOUT
AAFILTL AAFILTR
FILTL
FILTR
GNDA
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.
漏 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

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