AD7864ASZ-1

AD7864ASZ-1 is a high-speed, low-power, 4-channel simultaneous sampling 12-bit successive approximation (SAR) analog-to-digital converter from Analog Devices. It operates from a single 5 V supply and integrates four track-and-hold amplifiers, a 2.5 V reference, an on-chip clock oscillator, signal conditioning circuitry, and a high-speed parallel interface.

This surface-mount device comes in a 44-MQFP (10x10 mm) package and supports analog input ranges of ±10 V and ±5 V for the AD7864-1 variant. It achieves a 520 kS/s sampling rate with a typical conversion time of 1.65 µs per channel and 0.35 µs track-and-hold acquisition time. Power dissipation is 90 mW typical, and a power-saving mode reduces consumption to 20 µW.

The parallel interface allows direct connection to 3 V processors, and on-chip overvoltage protection on analog inputs adds robustness. The operating temperature range is -40°C to +85°C. Common applications include AC motor control, uninterruptible power supplies, data acquisition systems, and communications equipment.