The AD7822/AD7825/AD7829 are high speed, 1-, 4-, and 8-channel, microprocessor-compatible, 8-bit analog-to-digital converters. They have a conversion time of 420 ns, one, four, and eight single-ended analog input channels, adjustable input offset, 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, input ranges of 0 V to 2 V p-p with VDD = 3 V ± 10% and 0 V to 2.5 V p-p with VDD = 5 V ± 10%, and a flexible parallel interface with EOC pulse to allow standalone operation.
The AD7822, AD7825, and AD7829 are high‑speed, 1‑, 4‑, and 8‑channel, microprocessor‑compatible 8‑bit analog‑to‑digital converters with up to 2 MSPS throughput. They include an on‑chip 2.5 V reference, track‑and‑hold amplifier, and a flexible parallel interface that supports standalone operation.
The datasheet details features, applications, functional block diagrams, specifications, timing characteristics, absolute maximum ratings, pin configurations, terminology, circuit information, typical connection diagrams, and operating modes, providing all necessary information for designers to integrate these ADCs into their systems.
| Resolution | 8 Bits |
|---|---|
| Supply Voltage Range | 3 V ± 10% and 5 V ± 10% |
| Conversion Time | 420 ns max |
| Signal‑to‑Noise+Distortion Ratio | 148 dB min |
| Normal‑Operation Current | 12 mA max |
The devices can achieve a maximum throughput of 2 MSPS.
They operate from a single supply of 3 V ± 10% or 5 V ± 10%.