GENERAL DESCRIPTION

The AD7725 is a complete 16-bit,Σ-Δ analog-to-digital converter with on-chip, user-programmable signal conditioning. The output of the modulator is processed by three cascaded finite impulse response (FIR) filters, followed by a fully user-programmable postprocessor. The postprocessor provides processing power of up to 130 million accumulates (MAC) per second. The user has complete control over the filter response, the filter coefficients, and the decimation ratio.

FEATURES

Programmable Filtering:

Any Characteristic up to 108 Tap FIR and/or IIR

Polynomial Signal Conditioning up to 8th Order

Programmable Decimation and Output Word Rate

Flexible Programming Modes:

Boot from DSP or External EPROM

Parallel/Serial Interface

Internal Default Filter for Evaluation

14.4 MHz Max Master Clock Frequency

0 V to +4 V (Single-Ended) or ±2 V (Differential) Input

Range

Power Supplies: AVDD, DVDD: 5 V ± 5

On-Chip 2.5 V Voltage Reference

44-Lead MQFP Package

TYPICAL APPLICATIONS

Radar

Sonar

Auxiliary Car Functions

Medical Communications