Single-Channel, 3 V and 5 V Front-End Processor for General Purpose Applications Including Speech and Telephony

The AD73311 and AD73311L are complete front-end processors for general-purpose applications including speech and telephony. They feature 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 the voiceband signal bandwidth. The AD73311L is a follow-on to the AD73311 with improved on-chip filtering, more sample-rate options and lower cost. The L version operates from 3.0 V only, where as the AD73311 operates from either 3 V or 5 V power supplies.

The gains of the A/D and D/A conversion channels are programmable over 38 dB and 21 dB respectively. An on-chip reference voltage is included to allow single-supply operations. A serial port (SPORT) allows easy interfacing for single or cascaded devices to industry standard DSP engines.

The AD73311 and AD73311L are suitable for a variety of applications in the speech and telephony areas 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 multi-channel active-control applications.

APPLICATIONS

* General Purpose Analog I/O

* Speech Processing

* Cordless and Personal Communications

* Telephony

* Active Control of Sound & Vibration

* Data Communications

* 16-Bit A/D Converters

* 16-Bit D/A Converters

* Programmable Input/Output Sample Rates

* 75 dB ADC SNR

* 70 db DAC SNR

* 64 ksps Maximum Sample Rate

* -90 db Crosstalk

* Low group Delay: 25 µs per ADC ch; 50 µs per DAC ch