GENERAL DESCRIPTION

This device consists of two seventh order sigma-delta modulators. Each modulator converts its analog input signal into a high speed 1-bit data stream. The part operates from a 5 V power supply and accepts a differential input range of 0 V to +2.5 V or ±1.25 V centered about a common-mode bias. The analog inputs are continuously sampled by the analog modulators, eliminating the need for external sample-and-hold circuitry. The input information is contained in the output stream as a density of ones. The original information can be digitally reconstructed with an appropriate digital filter.

FEATURES

13 MHz Master Clock Frequency

0 V to +2.5 V or ±1.25 V Input Range

Single Bit Output Stream

90 dB Dynamic Range

Power Supplies

AVDD, DVDD: 5 V ± 5

DVDD1: 3 V ± 5

Logic Outputs 3 V/5 V Compatible

On-Chip 2.5 V Voltage Reference

48-Lead LQFP