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Analog Devices Semiconductor Electronic Components Datasheet



AD1843

Serial-Port 16-Bit SoundComm Codec



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AD1843 pdf
a
Serial-Port 16-Bit
SoundComm Codec
AD1843
FEATURES
Single Chip Integrated Speech, Audio, Fax and Modem
Codec
Highly Configurable Stereo ∑∆ ADCs and Quad ∑∆ DACs
Supports V.34, V.32bis, and Fallback Modem Standards
As Well As Voice Over Data
Dual Digital Resamplers with Programmable Input and
Output Phase and Frequency
Three On-Chip Phase Lock Loops for Synchronization to
External Signals, Including Video
Thirteen Analog Inputs and Seven Analog Outputs
Advanced Analog and Digital Signal Mixing and Digital-
to-Digital Sample Rate Conversion
Programmable Gain, Attenuation and Mute
On-Chip Signal Filters
Digital Interpolation and Decimation
Analog Output Low Pass
1 Hz Resolution Programmable Sample Rates from 4 kHz
to 54 kHz Derived from a Single Clock Input
80-Lead PQFP and 100-Lead TQFP Packages
Operation from +5 V or Mixed +5 V/+3 V Supplies
FIFO-Buffered Serial Digital Interface Compatible with
ADSP-21xx Fixed-Point DSPs
Advanced Power Management
VHDL Model of Serial Port Available; Evaluation Board
and MAFE Board Available
GENERAL PRODUCT DESCRIPTION
The AD1843 SoundComm™ Codec is a complete analog front
end for high performance DSP-based telephony and audio ap-
plications. The device integrates the real-world analog I/O re-
quirements for many popular functions thereby reducing size,
power consumption, and system complexity. The AD1843
SoundComm is the world’s first codec which can support four
different sample rates simultaneously, without any beat fre-
quency noise issues. This is essential for highly integrated audio/
modem/fax products since the sample rates associated with au-
dio are very much distinct from the sample rates associated with
telephony-oriented data communication. It is also the first codec
to offer on-chip digital phase lock loops for sample rate synchro-
nization to external clock signals. This sample rate flexibility is
enabled through Analog Devices’ Continuous Time Oversampling
(CTO) technology.
The main elements of the AD1843 are its extensive input and mix-
ing section, its two channels of sigma-delta (∑∆) analog-to-digital
conversion, its four channels of ∑∆ digital-to-analog conversion, its
digital filters, and the clock and control circuitry for implementing
the device’s different modes. The AD1843 permits flexible sample-
rate selection through programming and external synchronization,
many input and output options, and many mixing options.
(continued on page 11)
SoundComm is a trademark of Analog Devices, Inc.
SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM
SYNC XTAL CONV BIT
LIN 4
MIC
AUX1
AUX2
AUX3
MIN
2
2
2
2
1
MOUT
2
LOUT1
HPOUTL
HPOUTC
HPOUTR
LOUT2
SUM
4
2
3233
20 dB
AD1843
S
CLOCK GENERATION
CLKOUT
E CONTROL
MUTE
MUTE
L
E
C
T
O
R
GAM GAM GAM GAM GAM
PGA
∑∆
ADC
S
E
L
E
C
T
O
R
S
E
L
E
C
T
O
R
ATTN
MUTE
GAM
∑∆
DAC
LEFT AND
M
U
T
ATTN
E
REGISTERS
µ/A
LAW
FIFO
µ/A
LAW
ADC
D
I
G
I
T
A
L
DAC1
I
SCLK
SDFS
SDI
SDO
BM
CS
TSO
DRIVER
RIGHT CHANNELS
MUTE
GAM
MUTE
ATTN
N
T TSI
E2
MUTE
GAM = GAIN
ATTENUATION
MUTE
MUTE
MUTE
R XCTL [1:0]
F
A PDMNFT
C
LEFT AND
RIGHT CHANNELS
GAM
VOLTAGE REFERENCE
∑∆
DAC
M
U
T
ATTN
E
E
FIFO
µ/A
LAW
DAC2
RESET
PWRDWN
43
89
REV. 0
VREF CMOUT
AAFILTL AAFILTR
FILTL FILTR
GNDA VCC
GNDD VDD
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.
© 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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AD1843 pdf
AD1843–SPECIFICATIONS
STANDARD TEST CONDITIONS UNLESS OTHERWISE NOTED
Temperature
25
°C DAC Conditions
Digital Supply (VDD)
Analog Supply (VCC)
Sample Rate (FS)
5.0
5.0
48
V Autocalibrated
V 0 dB Attenuation
kHz 0 dB Relative to Full Scale
Input Signal
1008
Hz 16-Bit Linear Mode
Analog Output Passband 20 Hz to 20 kHz
No Output Load
ADC FFT Size
2048
Mute Off
DAC FFT Size
8192
DAC1 Single-Ended
VIH 2.0 V DAC2 Differential
VIL 0.8 V
VOH 2.4 V
VOL 0.4 V
IOH –2 mA
IOL 2 mA
ADC Input Conditions
Mic 20 dB Gain Disabled
LIN Single-Ended
(LINLSD & LINRSD = 0)
Autocalibrated
0 dB PGA Gain
–1.0 dB Relative to Full Scale
Line Input
16-Bit Linear Mode
ANALOG INPUT
Min
Typ
Max
Units
Full-Scale Input Voltage (RMS Values Assume Sine Wave Input)
All Inputs with ADRFLT & ADLFLT = 0 and LINLSD & LINRSD = 0
(LINLP, LINRP, AUX1L, AUX1R, AUX2L,
AUX2R, AUX3L, AUX3R, MIN)
All Inputs with ADRFLT & ADLFLT = 0 and LINLSD & LINRSD = 1
(LINLP & LINLN, LINRP & LINRN)
All Inputs with ADRFLT & ADLFLT = 1 and LINLSD & LINRSD = 0
(LINLP, LINRP, AUX1L, AUX1R, AUX2L, AUX2R, AUX3L,
AUX3R, MIN)
All Inputs with ADRFLT & ADLFLT = 1 and LINLSD & LINRSD = 1
(LINLP & LINLN, LINRP & LINRN)
MIC with +20 dB Gain (LMGE & RMGE = 1
and ADRFLT & ADLFLT = 0)
(MICL, MICR)
MIC with 0 dB Gain (LMGE & RMGE = 0
and ADRFLT & ADLFLT = 0)
(MICL, MICR)
AUX, SUM and MIN Input Impedance*
(AUX1L, AUX1R, AUX2L, AUX2R, AUX3L, AUX3R, SUML,
SUMR, MIN)
LIN Input Impedance* (LINLP, LINLN, LINRP, LINRN)
MIC Input Impedance* (MICL, MICR)
Input Capacitance* (All Inputs)
2.55
5.1
2.8
5.6
0.25
2.55
10K
40K
20K
1
2.828
2
5.656
1.127
3.156
2.254
6.312
0.1
0.2828
1
2.828
3.1
6.2
3.5
7.0
0.31
3.1
15
V rms
V p-p
V rms
V p-p
V rms
V p-p
V rms
V p-p
V rms
V p-p
V rms
V p-p
pF
PROGRAMMABLE GAIN AMPLIFIER–ADC
Min
Typ
Max
Units
Step Size (0 dB to 22.5 dB) (All Steps Tested)
PGA Gain Range Span*
1.3 1.5 1.7 dB
21.5 22.5 23.5 dB
INPUT (AUX1, AUX2, AUX3, MIN, MIC)
ANALOG AMPLIFIERS/ATTENUATORS
Min
Typ
Max
Units
Step Size (+12.0 dB to –30 dB) (All Steps Tested)
Step Size (–31.5 dB to –34.5 dB) (All Steps Tested)
Input Gain/Attenuation Range*
Mute Attenuation*
1.25 1.5
1.75 dB
1.1 1.5 1.9 dB
45.5 46.5 47.5 dB
–80.0
dB
–2– REV. 0



Part Number AD1843
Description Serial-Port 16-Bit SoundComm Codec
Maker Analog Devices - Analog Devices
Total Page 30 Pages
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