AD7821KR

The AD7821KR is a high-speed, 8-bit sampling analog-to-digital converter (ADC) from Analog Devices Inc. It features a conversion time of 660 ns maximum and a 1 MHz sampling rate. The built-in track-and-hold function allows digitizing full-scale signals up to 100 kHz. The device accepts both unipolar (0 V to 5 V) and bipolar (-5 V to 5 V) input ranges, depending on the supply configuration (single +5 V or dual ±5 V supplies).

Power dissipation is typically 50 mW. The ADC provides a parallel data interface and includes standard microprocessor control signals (CS, RD, WR, RDY, INT) with latched three-state outputs. An overflow output (OFL) is available for cascading devices. The ADC uses a half-flash conversion technique that eliminates the need for an external clock.

The AD7821KR is housed in a 20-pin SOIC package (0.295" width, 7.50 mm) and is designed for surface mount mounting. It operates over the industrial temperature range of -40°C to 85°C. The device contains three A/D converters and achieves a total unadjusted error of ±1 LSB maximum over the full operating temperature range.