AD7703ARZ

AD7703 is a 20bit ADC that uses a sigma-delta (Ʃ-Δ) conversion technique. The analogue input is continuously sampled by an analogue modulator whose mean output duty cycle is proportional to the input signal. The modulator output is processed by an on-chip digital filter with a six-pole Gaussian response which updates the output data register with 16bit binary words at word rates up to 4KHz. The sampling rate, filter corner frequency and output word rate are set by a clock input that may be supplied externally or by a crystal controlled on-chip clock oscillator. The inherent linearity of the ADC is excellent and endpoint accuracy is ensured by self-calibration of zero and full scale which may be initiated at any time. The self-calibration scheme can also be extended to null system offset and gain errors in the input channel. Typical applications include industrial process control, weigh scales, portable instrumentation, remote data acquisition.

• Monolithic 16bit ADC
• 0.0015% linearity error
• On-chip self-calibration circuitry
• Programmable low-pass filter
• 0.1Hz to 10Hz corner and 0V to +2.5V or ±2.5V analogue input range
• 4KSPS output data rate
• Flexible serial interface
• Ultralow power
• 20 lead WSOIC package
• Operating temperature range from -40 to 85°C

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party