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AD1843JS
Serial-Port 16-Bit SoundComm Codec
ANALOG
DEVICES
Serial-Port iB-Bit
SoundComm Codec
FEATURES
Single Chip Integrated Speech, Audio, Fax and Modem
Highly Configurable Stereo SA ADCs and Quad SA 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 POFP and 100-Lead TQFP Packages
Operation from +5 V or Mixed +5 V/+3 V Supplies
FlFO-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 SoundCommTM 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 (2A) analog-to-digital
conversion, its four channels of EA 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 I f)
SoundComm is a trademark of Analog Devices, Inc.
SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM
SYNC XTAL CONV BIT
m s AD1843 CLOCK GENERATION CLKOUT
E CONTROL
AUX1 SA s
AUX2 ' C ADC E
AUX3 T
MIN - fl E c SCLK
E o SDFS
1 , r , T SDI
MOUT IGAMI IGAMI [GAMI IGAMI [GAMI _ fl soo
EA Gs, cs
LOUT1 E m DAC s
LEFT AND TSO
RIGHT CHANNELS MUTE
MUTE Ts,
l GAM = GAIN XCTL [1:0]
HPOUTL ATTENUATION PDMNFT
HPOUTC MUTE
LEFT AND RESET
HPOUTR RIGHT CHANNELS fe,io.1, SA 2
LOUT2 'rsh' DAC PWRDWN
SUM VOLTAGE REFERENCE
VREF CMOUT
REV. 0
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.
T T F F
AAFILTL AAFILTR FILTL
GNDD VDD
© 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
Jlll1843-$PEiyFliyirliW;
STANDARD TEST CONDITIONS UNLESS OTHERWISE NOTED
Temperature 25 °C DAC Conditions ADC Input Conditions
Digital Supply (V DD) 5.0 V Autocalibrated Mic 20 dB Gain Disabled
Analog Supply (V cc) 5.0 V 0 dB Attenuation LIN Single-Ended
Sample Rate (Fs) 48 kHz 0 dB Relative to Full Scale (LINLSD & LINRSD = 0)
Input Signal 1008 Hz 16-Bit Linear Mode Autocalibrated
Analog Output Passband 20 Hz to 20 kHz No Output Load 0 dB PGA Gain
ADC FFT Size 2048 Mute Off -1.0 dB Relative to Full Scale
DAC FFT Size 8192 DAC1 Single-Ended Line Input
Vm 2.0 V DAC2 Differential 16-Bit Linear Mode
Vu., 0.8 V
VOH 2.4 V
VOL 0.4 V
Ion -2 mA
lor., 2 mA
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 1 V rms
(LINLP, LINRP, AUXlL, AUXIR, AUX2L, 2.55 2.828 3.1 V p-p
AUX2R, AUX3L, AUX3R, MIN)
All Inputs with ADRFLT & ADLFLT = 0 and LINLSD & LINRSD = 1 2 V rms
(LINLP & LINLN, LINRP & LINRN) 5.1 5.656 6.2 V p-p
All Inputs with ADRFLT & ADLFLT = 1 and LINLSD & LINRSD = 0 1.127 V rms
(LINLP, LINRP, AUXlL, AUXlR, AUX2L, AUX2R, AUX3L, 2.8 3.156 3.5 V p-p
AUX3R, MIN)
All Inputs with ADRFLT & ADLFLT = 1 and LINLSD & LINRSD = 1 2.254 V rms
(LINLP & LINLN, LINRP & LINRN) 5.6 6.312 7.0 V p-p
MIC with +20 dB Gain (LMGE & RMGE = 1
and ADRFLT & ADLFLT = O) 0.1 V rms
(MICL, MICR) 0.25 0.2828 0.31 V p-p
MIC with 0 dB Gain (LMGE & RMGE = 0
and ADRFLT & ADLFLT = 0) 1 V rms
(MICL, MICR) 2.55 2.828 3.1 V p-p
AUX, SUM and MIN Input Impedance* 10K n
(AUXIL, AUXlR, AUX2L, AUX2R, AUX3L, AUX3R, SUML,
SUMR, MIN)
LIN Input Impedance' (LINLP, LINLN, LINRP, LINRN) 40K n
MIC Input Impedance' (MICL, MICR) 20K n
Input Capacitance' (All Inputs) 15 pF
PROGRAMMABLE GAIN AMPLIFIER-ADC
Min Typ Max Units
Step Size (0 dB to 22.5 dB) (All Steps Tested) 1.3 1.5 1.7 dB
PGA Gain Range Span" 21.5 22.5 23.5 dB
INPUT (AUXl, AUX2, AUX3, MIN, MIC)
ANALOG AMPLIFIERS/ATTENUATORS
Min Typ Max Units
Step Size (+12.0 dB to -30 dB) (All Steps Tested) 1.25 1.5 1.75 dB
Step Size (-31.5 dB to -34.5 dB) (All Steps Tested) 1.1 1.5 1.9 dB
Input Gain/Attenuation Range' 45.5 46.5 47.5 dB
Mute Attenuation' -80.0 dB
REV. O
AD1843
DIGITAL DECIMATION AND INTERPOLATION FILTERS-AUDIO MODE*
Min Max Units
Passband 0 0.40 M Fs Hz
Passband Ripple 0 -0.0 1 6 dB
Transition Band 0.4 X Fs 0.6 X Fs Hz
Stopband1 0.6 X Fs Hz
Stopband Rejection 91.8 dB
Group Delay 15/Fs s
Group Delay Variation Over Passband 0.0 ps
DIGITAL DECIMATION AND INTERPOLATION FILTERS-MODEM MODE*
Min Max Units
Passband 0 0.442 X Fs Hz
Passband Ripple 0 -0.220 dB
Transition Band 0.442 X Fs 0.542 X Fs Hz
Stopband2 0.542 M Fs Hz
Stopband Rejection 75.7 dB
Group Delay l9/Fs s
Group Delay Variation Over Passband 0.0 us
Sample Rate 24 kHz
DIGITAL DECIMATION AND INTERPOLATION FILTERS-RESAMPLER MODE'
Min Max Units
Passband 0 0.4 X Fs Hz
Passband Ripple 0 -0.035 dB
Transition Band 0.4 X Fs 0.5 X Fs Hz
Stopband3 0.5 x Fs Hz
Stopband Rejection 92.2 dB
Group Delay 25/Fs s
Group Delay Variation Over Passband 0.0 ps
ANALOG-TO-DIGITAL CONVERTERS
Min Typ Max Units
Audio Dynamic Range (-60 dB Input, THD+N Referenced to Full Scale,
A-Weighted, ADRFLT & ADLFLT = 0) 80 85 dB
Modem Dynamic Range (-60 dB Input, THD+N Referenced to Full Scale,
300 Hz to 4 kHz Analog Output Passband, LINRSD & LINLSD = l,
ADRFLT & ADLFLT = 1, Fs = 12.8 kHz) 87 90 dB
Audio THD+N (Referenced to Full Scale) 0.03 %
-74 -70 dB
Modem THD+N (-3.0 dB Referenced to Full Scale,
300 Hz to 4 kHz Analog Output Passband, LINRSD & LINLSD = 1,
ADRFLT & ADLFLT = 1, Fs = 12.8 kHz) 0.02 %
-78.5 -74 dB
Audio Signal-to-Intermodulation Distortions (CCIF Method) -94 -80 dB
ADC Crosstalk*
LIN Inputs (Input L, Ground R, Read R; Input R, Ground L, Read L) -80 dB
Line to MIC (Input LIN, Ground and Select MIC, Read Both Channels) -80 dB
Line to AUXl, AUX2, AUX3, MIN -80 dB
Interchannel Gain Mismatch (Difference of Gain Errors) 10.5 dB
ADC Offset Error 10 50 mV
REV. o -3-
A01843
DACl DIGITAL-TO-ANALOG CONVERTERS
Min Typ Max Units
Audio Dynamic Range (-60 dB Input, THD+N Referenced to Full Scale,
A-Weighted, DAlFLT = 0) 77 80 dB
Audio THD+N (Referenced to Full Scale, DAlFLT = O) 0.03 %
-74 -70 dB
Audio Signal-to-Intern/lation Distortions (CCIF Method) -92 -80 dB
Interchannel Gain Mismatch (Difference of Gain Errors) i0.5 dB
DAC Crosstalk* (Input L, Zero R, Measure LOUTIR; Input R, Zero L,
Measure LOUTlL) -77 dB
Total Out-of-Band Energy'
(Measured from 0.6 M Fs to 100 kHz in Audio Mode) -60 dB
Audible Out-of-Band Energy'
(Measured from 0.6 X Fs to 22 kHz in Audio Mode,
Tested at Fs = 8.0 kHz) -72 dB
DAC2 DIGITAL-TO-ANALOG CONVERTERS
Min Typ Max Units
Audio Dynamic Range (-60 dB Input, THD+N Referenced to Full Scale,
A-Weighted, DA2FLT = O) 78 80 dB
Modem Dynamic Range (-60 dB Input, THD+N Referenced to Full Scale,
300 Hz to 4 kHz Analog Output Passband, DA2FLT = 1, RDA2G5:0
& LDA2G5:0 = 000101 [4.5 dB], Fs = 12.8 kHz) 87 90 dB
Audio THD+N (Referenced to Full Scale, DA2FLT = 0) 0.03 %
-77 -70 dB
Modem THD+N (-3.0 dB Referenced to Full Scale,
300 Hz to 4 kHz Analog Output Passband, DA2FLT = 1, RDA2G5:0
& LDA2G5:0 = 000101 [4.5 dB], Fs = 12.8 kHz) 0.016 %
-81 -76 dB
Audio Signal-to-Intermodulation Distortions (CCIF Method) -86 -80 dB
Interchannel Gain Mismatch (Difference of Gain Errors) i0.5 dB
DAC Crosstalk* (Input L, Zero R, Measure LOUT2R; Input R, Zero L,
Measure LOUT2L) -80 dB
Total Out-of-Band Energy'
(Measured from 0.6 X Fs to 100 kHz in Audio Mode) -60 dB
Audible Out-of-Band Energy'
(Measured from 0.6 M Fs to 22 kHz in Audio Mode,
Tested at Fs = 8.0 kHz) -72 dB
DC Offset 5 25 mV
DACl AND DAC2 ANALOG AMPLIFIERSIATTENUATORS
Min Typ Max Units
Step Size (+12.0 dB to -30.0 dB) (All Steps Tested) 1.25 1.5 1.75 dB
Step Size (-31.5 dB to -34.5 dB) (All Steps Tested) 1.1 1.5 1.9 dB
Step Size (-36.0 dB to -82.5 dB)* 1.3 1.5 1.7 dB
Output Attenuation Span' 81.5 82.5 83.5 dB
Mute Attenuation' -80 dB
DIGITAL MIX ATTENUATORS
Min Typ Max Units
Step Size (0 dB to -94.5 dB)* (All Steps Tested) 1.3 1.5 1.7 dB
Output Attenuation Span' 93.5 94.5 95.5 dB
Mute Attenuation' -90 dB
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