AD7946 is a 14-bit, 500 kSPS PulSAR ADC with a pseudo differential analog input range of 0 V to REF, REF up to VDD, no pipeline delay, single-supply 5 V operation, 1.8 V/2.5 V/3 V/5 V logic interface, serial interface, SPI/QSPI/MICROWIRE™/DSP compatible, daisy-chain multiple ADCs and BUSY indicator.
The AD7946 is a 14‑bit, charge‑redistribution successive‑approximation ADC that operates from a single 5 V supply. It offers a serial interface compatible with SPI, QSPI, MICROWIRE and DSP protocols, and supports optional daisy‑chaining and a BUSY indicator.
Key features include 500 kSPS throughput, no missing codes, low power dissipation (3.3 mW @ 5 V/100 kSPS), standby current of 1 nA, and operation over –40 °C to +85 °C. The device is available in 10‑lead MSOP and QFN (LFCSP) packages.
| Resolution | 14 Bits |
|---|---|
| Throughput | 500 kSPS |
| Analog input range | 0 V to REF |
| Power dissipation (100 kSPS) | 3.3 mW @ 5 V |
| Standby current | 1 nA |
| Supply voltage (VDD) | 4.5 V to 5.5 V |
| Reference voltage range | 0.5 VDD + 0.3 V |
| Input bandwidth | 9 MHz |
| Aperture delay | 2.5 ns |
| Operating temperature range | –40 °C to +85 °C |
The AD7946 can sample at up to 500 kSPS.
It operates from a single supply of 4.5 V to 5.5 V (VDD).
Yes, the serial interface includes an optional BUSY indicator.
Yes, the AD7946 can be daisy‑chained on a 3‑wire serial interface.