Low Cost, Low Power CMOS
General Purpose Analog Front End
a
AD73311L
FEATURES
GENERAL DESCRIPTION
16-Bit A/D Converter
16-Bit D/A Converter
Programmable Input/Output Sample Rates
76 dB ADC SNR
77 dB DAC SNR
Programmable Sampling Rate
64 kS/s Maximum Sample Rate
–90 dB Crosstalk
Low Group Delay (25 ms Typ per ADC Channel,
50 ms Typ per DAC Channel)
Programmable Input/Output Gain
Flexible Serial Port Which Allows Up to Eight Devices
to Be Connected in Cascade
Single (+3 V) Supply Operation
33 mW Max Power Consumption at 2.7 V
On-Chip Reference
The AD73311L is a complete front-end processor for general
purpose applications including speech and telephony. It features
a 16-bit A/D conversion channel and a 16-bit D/A conversion
channel. Each channel provides 70 dB signal-to-noise ratio over
a voiceband signal bandwidth. The final channel bandwidth can
be reduced, and signal-to-noise ratio improved, by external
digital filtering in a DSP engine.
The AD73311L is suitable for a variety of applications in the
speech and telephony area, including low bit rate, high quality
compression, speech enhancement, recognition and synthesis.
The low group delay characteristic of the part makes it suitable
for single or multichannel active control applications.
The gains of the A/D and D/A conversion channels are program-
mable over 38 dB and 21 dB ranges respectively. An on-chip
reference voltage is included to allow single supply operation.
A serial port (SPORT) allows easy interfacing of single or cas-
caded devices to industry standard DSP engines.
20-Lead SOIC/SSOP/TSSOP Packages
APPLICATIONS
General Purpose Analog I/O
Speech Processing
The AD73311L is available in 20-lead SOIC, SSOP and
TSSOP packages.
Cordless and Personal Communications
Telephony
Active Control of Sound and Vibration
Data Communications
FUNCTIONAL BLOCK DIAGRAM
AVDD1
AVDD2
DVDD
SDI
ANALOG
LOOPBACK/
SINGLE-ENDED
ENABLE
VINP
VINN
ANALOG
SIGMA-DELTA
MODULATOR
0/38dB
PGA
DECIMATOR
SDIFS
SCLK
SDO
SERIAL
I/O
PORT
SDOFS
VOUTP
VOUTN
SWITCHED-
CONTINUOUS
TIME
DIGITAL
SIGMA-DELTA
MODULATOR
1-BIT
DAC
SE
+6/–15dB
PGA
CAPACITOR
INTERPOLATOR
LOW-PASS FILTER
LOW-PASS FILTER
MCLK
RESET
REFCAP
REFOUT
REFERENCE
AD73311L
AGND1
DGND
AGND2
REV. A
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.
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Tel: 781/329-4700
Fax: 781/326-8703
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© Analog Devices, Inc., 2000