GENERAL DESCRIPTION

The AD7822/AD7825/AD7829 are high speed, 1-, 4-, and 8-channel, microprocessor-compatible, 8-bit analog-to-digital converters with a maximum throughput of 2 MSPS. The AD7822/AD7825/AD7829 contain an on-chip reference of 2.5 V (2 tolerance); a track-and-hold amplifier; a 420 ns, 8-bit halfflash ADC; and a high speed parallel interface. The converters can operate from a single 3 V ± 10 and 5 V ± 10 supply.

FEATURES

8-bit half-flash ADC with 420 ns conversion time

One, four, and eight single-ended analog input channels

Available with input offset adjust

On-chip track-and-hold

SNR performance given for input frequencies up to 10 MHz

On-chip reference (2.5 V)

Automatic power-down at the end of conversion

Wide operating supply range

3 V ± 10 and 5 V ± 10

Input ranges

0 V to 2 V p-p, VDD = 3 V ± 10

0 V to 2.5 V p-p, VDD = 5 V ± 10

Flexible parallel interface with EOC pulse to allow

standalone operation

APPLICATIONS

Data acquisition systems, DSP front ends

Disk drives

Mobile communication systems, subsampling

applications