AD7705/AD7706 are 16-bit Σ-Δ ADCs with 3 V/5 V operation and 1 mW power dissipation. They have 2-/3-channel inputs and feature a programmable gain front end, support for multiple serial interfaces, and are suitable for low frequency measurement applications.
The AD7705 (2 fully differential channels) and AD7706 (3 pseudo‑differential channels) are complete analog front‑ends for low‑frequency measurement applications. They accept low‑level signals directly from transducers and provide serial digital output via SPI, QSPI, Microwire or DSP‑compatible interfaces.
Both devices operate from a single 2.7 V‑3.3 V or 4.75 V‑5.25 V supply, consume less than 1 mW at 3 V, and feature standby currents below 8 µA. Integrated programmable‑gain front‑ends (gain 1‑128) and on‑chip calibration reduce external signal‑conditioning requirements.
| Resolution | 16 bits, no missing codes |
|---|---|
| Power dissipation (3 V) | 1 mW max |
| Standby current | 8 µA max |
| Supply voltage range | 2.7 V‑3.3 V or 4.75 V‑5.25 V |
| Programmable gain | 1 to 128 |
They operate from either 2.7 V to 3.3 V or 4.75 V to 5.25 V.
The AD7706 provides three pseudo‑differential input channels.
Standby current is less than 8 µA (8 µA max).
Both devices deliver 16‑bit resolution with no missing codes.