Datasheet AD73311L (Analog Devices)

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