AD7703ANZ

AD7703ANZ is a 20bit ADC that uses a Σ to ∆ 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 host 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. Applications include industrial process control, weigh scales, portable instrumentation, and remote data acquisition.

• Monolithic 16bit ADC, on-chip self-calibration circuitry
• Flexible serial interface, ultralow power
• Integral nonlinearity is ±0.0015% FSR typical at (TA = 25C; AVDD = DVDD = +5V; AVSS = DVSS = -5V)
• Differential nonlinearity is ±0.5LSB typical at (TA = 25°C; AVDD = DVDD = +5V; AVSS = DVSS = -5V)
• Input bias current is 1nA typical at (TA = 25°C; AVDD = DVDD = +5V; AVSS = DVSS = -5V)
• Input capacitance is 20pF typical at (TA = 25°C; AVDD = DVDD = +5V; AVSS = DVSS = -5V)
• Analog positive supply range from 4.5V to 5.5V
• Noise is 1.6LSB rms typical at (TA = 25°C; AVDD = DVDD = +5V; AVSS = DVSS = -5V)
• Analog positive supply current is 2.7mA max at (TA = 25°C; AVDD = DVDD = +5V; AVSS = DVSS = -5V)
• Operating temperature range from -40°C to +85°C, 20-lead Plastic dual in-line package

Notes

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