AD73311: Low Cost, Low Power CMOS General Purpose Analog Front End Data Sheet0 pages

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Low Cost, Low Power CMOS
General Purpose Analog Front End
AD73311

FEATURES
16-Bit A/D Converter
16-Bit D/A Converter
Programmable Input/Output Sample Rates
75 dB ADC SNR
70 dB DAC SNR
64 kS/s Maximum Sample Rate
–90 dB Crosstalk
Low Group Delay (25 ␮s Typ per ADC Channel,
50 ␮s Typ per DAC Channel)
Programmable Input/Output Gain
Flexible Serial Port which Allows up to 8 Devices
to Be Connected in Cascade
Single (+2.7 V to +5.5 V) Supply Operation
50 mW Max Power Consumption at 2.7 V
On-Chip Reference
20-Lead SOIC/SSOP Package

GENERAL DESCRIPTION

The AD73311 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 AD73311 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 programmable 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 cascaded devices to industry standard DSP engines.

APPLICATIONS
General Purpose Analog I/O
Speech Processing
Cordless and Personal Communications
Telephony
Active Control of Sound & Vibration
Data Communications

The AD73311 is available in both 20-lead SOIC and SSOP
packages.

FUNCTIONAL BLOCK DIAGRAM
AVDD1

AVDD2

DVDD

SDI
VINP

SDIFS

ANALOG
SIGMA-DELTA
MODULATOR

0/38dB
PGA

DECIMATOR
SCLK

VINN
SERIAL
I/O
PORT
VOUTP
+6/–15dB
PGA
VOUTN
REFCAP

CONTINUOUS
TIME
LOW-PASS FILTER

SWITCHEDCAPACITOR
LOW-PASS FILTER

1-BIT
DAC

DIGITAL
SIGMA-DELTA
MODULATOR

INTERPOLATOR

SDO
SDOFS
SE
MCLK
RESET

REFERENCE

AD73311

REFOUT

AGND1

AGND2

DGND

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.

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© Analog Devices, Inc., 2000