AD7911/AD7921 are 10-bit and 12-bit high speed, low power, 2-channel successive approximation ADCs, respectively.
The AD7911 (10‑bit) and AD7921 (12‑bit) are successive‑approximation ADCs that operate from a single 2.35 V to 5.25 V supply. They provide up to 250 kSPS throughput, feature low‑power operation, and support SPI, QSPI, Microwire and DSP‑compatible serial interfaces. No pipeline delays and a standby mode of 1 pA are included.
The datasheet details electrical specifications, timing diagrams, conversion rates, power‑down behavior, and recommended layout practices. Typical applications include battery‑powered systems, medical instruments, high‑speed modems, and optical sensors.
| Throughput Rate | 250 kSPS |
|---|---|
| Typical Power Consumption (3 V, 250 kSPS) | 4 mW |
| Resolution (AD7911) | 10 Bits |
| Resolution (AD7921) | 12 Bits |
| Input Voltage Range | 0 to Vop (2.35 V‑5.25 V) |
| Conversion Time (AD7911) | 2.8 µs max (14 SCLK cycles) |
| Conversion Time (AD7921) | 3.2 µs max (16 SCLK cycles) |
| Signal‑to‑Noise Ratio (SNR) | 71 dB min |
Both devices support up to 250 kSPS throughput.
Typical power consumption is 4 mW.
The AD7911 converts in 2.8 µs max (14 SCLK cycles).