AD7822/AD7825/AD7829 is a 3 V/5 V, 2 MSPS, 8-bit, 1-, 4-, 8-channel sampling ADC
The AD7822, AD7825, and AD7829 are high‑speed 8‑bit analog‑to‑digital converters offering 1, 4, or 8 single‑ended input channels, on‑chip 2.5 V reference, track‑and‑hold, and a fast 420 ns conversion time. They operate from a single 3 V ± 10 % or 5 V ± 10 % supply and include automatic power‑down at the end of conversion.
The datasheet details functional block diagrams, pin configurations, timing characteristics, absolute maximum ratings, and full electrical specifications such as resolution, SNR, THD, supply current, and power dissipation. Ordering information, package options, and typical connection diagrams are also provided.
| Resolution | 8 Bits |
|---|---|
| Conversion Time (max) | 420 ns |
| Input Channels | 1 (AD7822), 4 (AD7825), 8 (AD7829) |
| Supply Voltage Range | 3 V ± 10 % or 5 V ± 10 % |
| On‑Chip Reference | 2.5 V |
| Power‑Down Current | 5 µA max |
| Signal‑to‑Noise‑plus‑Distortion Ratio | 48 dB min |
| Total Harmonic Distortion | 55 dB max |
The maximum conversion time is 420 ns.
AD7822 has 1 channel, AD7825 has 4 channels, and AD7829 has 8 channels.
They operate from a single 3 V ± 10 % or 5 V ± 10 % supply.
Yes, an on‑chip reference of 2.5 V is provided.