AD7938/AD7939 is a 8-channel, 1.5 MSPS, 12-bit and 10-bit parallel ADC with a sequencer, which features high accuracy, low power consumption, software-configurable analog inputs and high speed parallel interface
The AD7938 and AD7939 are 12‑bit and 10‑bit successive‑approximation ADCs with eight analog input channels and a built‑in sequencer. They operate from a single 2.7 V to 5.25 V supply and deliver up to 1.5 MSPS throughput.
The devices feature an on‑chip 2.5 V reference, selectable single‑ended, fully differential or pseudo‑differential inputs, and low power consumption (6 mW at 3 V, 13.5 mW at 5 V). Detailed specifications, timing diagrams, and pin descriptions are provided.
| Throughput rate | 1.5 MSPS max |
|---|---|
| Power consumption (3 V supply) | 6 mW max |
| Power consumption (5 V supply) | 13.5 mW max |
| SINAD (differential mode) | 69 dB min |
| Resolution (AD7938) | 12 bits |
| Resolution (AD7939) | 10 bits |
| Reference voltage | 2.5 V on‑chip |
| Input range (single‑ended, 3 V supply) | ‑0.3 V to +0.7 V |
The devices can sample up to 1.5 MSPS.
It consumes up to 6 mW in normal operation.
Both parts include an accurate 2.5 V on‑chip reference.
The differential SINAD is at least 69 dB at a 50 kHz input.