ADI AD7731BRUZ-REEL7

The AD7731 is a complete analog front- end for process control applications. The device has a proprietary programmable gain front end that allows it to accept a range of input signal ranges, including low level signals, directly from a transducer. The sigma- delta architecture of the part consists of an analog modulator and a low pass programmable digital filter, allowing adjustment of filter cutoff, output rate and settling time.

The part features three buffered differential programmable gain analog inputs (which can be configured as five pseudo- differential inputs), as well as a differential reference input. The part operates from a single +5V supply and accepts seven unipolar analog input ranges: 0 to +20mV, +40mV, +80mV, +160mV, +320mV, +640mV, and +1.28V and seven bipolar ranges: ±20mV, ±40mV, ±80mV, ±160mV, ±320mV, ±640mV, and ±1.28V. The peak- to- peak resolution achievable directly from the part is 16 bits at an 800Hz output rate. The part can switch between channels with 1 ms settling time and maintain a performance level of 13 bits of peak- to- peak resolution.

The serial interface on the part can be configured for three- wire operation and is compatible with microcontrollers and digital signal processors. The AD7731 contains self- calibration and system calibration options and features an offset drift of less than 5nV / °C and a gain drift of less than 2ppm / °C.

The part is available in a 24- lead plastic DIP, a 24- lead SOIC and 24- lead TSSOP package.

• 24- Bit Sigma- Delta ADC
• 16 Bits p- p Resolution at 800 Hz Output Rate
• Programmable Output Rates up to 6.4 kHz
• Programmable Gain Front End
• ±0.0015% Nonlinearity
• Buffered Differential Inputs
• Programmable Filter Cutoffs
• FASTStep™ Model for Channel Sequencing
• Single Supply Operation

• Process Control
• PLCs/DCS
• Industrial Instrumentation