The AD7923 is a 12-bit, high speed, low power, 4-channel, successive approximation (SAR) ADC. It operates from a single 2.7 V to 5.25 V power supply and features throughput rates up to 200 kSPS. It contains a low noise, wide bandwidth track-and-hold amplifier that can handle input frequencies in excess of 50 kHz.
The AD7923 is a 12‑bit, high‑speed, low‑power, 4‑channel successive‑approximation ADC that operates from a 2.7 V to 5.25 V supply. It provides up to 200 kSPS conversion rate, a channel sequencer, and supports SPI, QSPI, Microwire and DSP‑compatible serial interfaces. Power dissipation is as low as 3.6 mW at 3 V and 7.5 mW at 5 V in normal operation.
The device includes flexible clock speed management, shutdown modes for ultra‑low power, and a SAR architecture with no pipeline delay. Recommended PCB layout separates analog and digital grounds, uses proper decoupling, and follows the grounding guidelines described in the Application Hints section.
| Resolution | 12 bits |
|---|---|
| Maximum Throughput Rate | 200 kSPS |
| Power Dissipation (3 V supply) | 3.6 mW max |
| Power Dissipation (5 V supply) | 7.5 mW max |
| Input Voltage Range (single‑ended) | 0 V to REFin or 0 V to 2×REFin |
| Signal‑to‑Noise Ratio (SNR) | ≥ 70 dB |
| Total Harmonic Distortion (THD) | ≤ ‑77 dB |
| Conversion Time (20 MHz SCLK) | 800 ns (16 SCLK cycles) |
The AD7923 can sample at up to 200 kSPS.
It dissipates 3.6 mW max when running at 200 kSPS with a 3 V supply.
The device supports SPI, QSPI, Microwire, and DSP‑compatible serial interfaces.
The conversion time can be as short as 800 ns (16 SCLK cycles).