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GENERAL DESCRIPTION

The AD7813 is a high-speed, microprocessor-compatible, 8-/10-bit analog-to-digital converter with a maximum throughput of 400 kSPS. The converter operates off a single 2.7 V to 5.5 V supply and contains a 2.3 μs successive approximation A/D converter, track/hold circuitry, on-chip clock oscillator and 8-bit wide parallel interface. The parallel interface is designed to allow easy interfacing to microprocessors and DSPs. The 10-bit conversion result is read by carrying out two 8-bit read opera tions. The first read operation accesses the 8 MSBs of the ADC conversion result and the second read accesses the 2 LSBs. Using only address decoding logic the AD7813 is easily mapped into the microprocessor address space.

FEATURES

8-/10-Bit ADC with 2.3 μs Conversion Time

On-Chip Track and Hold

Operating Supply Range: 2.7 V to 5.5 V

Specifications at 2.7 V–3.6 V and 5 V 10

8-Bit Parallel Interface

8-Bit + 2-Bit Read

Power Performance

Normal Operation

10.5 mW, VDD = 3 V

Automatic Power-Down

34.6 μW @ 1 kSPS, VDD = 3 V

Analog Input Range: 0 V to VREF

Reference Input Range: 1.2 V to VDD