The AD7946 is a 14-bit, 500 kSPS PulSAR ADC that is used in battery-powered equipment, data acquisition, instrumentation, medical instruments, and process control. The AD7946 is available in a 10-lead MSOP package that is pin-for-pin compatible with the 16-bit AD7686.
The AD7946 is a 14‑bit, charge‑redistribution successive‑approximation ADC that operates from a single 5 V supply. It offers a pseudo‑differential input range from OV to REF, supports 1.8 V‑5 V logic levels, and provides a serial SPI/QSPI/MICROWIRE interface with daisy‑chain capability and an optional BUSY indicator. Typical applications include data acquisition, instrumentation, medical devices, and process control.
The datasheet details electrical specifications such as resolution, throughput, power dissipation, and input voltage ranges, as well as mechanical information for the 10‑lead MSOP and 10‑lead QFN (LFCSP) packages. Layout guidelines, timing diagrams, pin descriptions, and ordering information are also provided to aid designers in integrating the AD7946 into their systems.
| Resolution | 14 Bits |
|---|---|
| Throughput | 500 kSPS |
| Power Dissipation (500 kSPS) | 3.3 mW @ 5 V |
| Standby Current | 1 nA |
| Input Voltage Range | OV to REF (REF up to VDD) |
| Supply Voltage (VDD) | 4.5 V to 5.5 V |
| Operating Temperature Range | -40 °C to +85 °C |
The AD7946 can sample at up to 500 kSPS.
The standby current is 1 nA.
The AD7946 is offered in a 10‑lead MSOP package and a 10‑lead QFN (LFCSP) package.
It operates from –40 °C to +85 °C.