AD7731 - ADI

The pictures are for reference only, and the specific specifications can be found in the product manual.

Part No

AD7731
Manufacturer

ADI
ChipWorker Part#

CW430803276
Description

CMOS, Low Noise 24Bit Sigma-Delta ADC with Fast Channel-Channel Settling Time
Documentation

Datasheet

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AD7731 Specifications

Attribute	Attribute Value

Part Number	AD7731
Manufacturer	ADI
ChipWorker Part#	CW430803276
Documentation	Datasheet
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Product Lifecycle Status	Active

Product Description

Product Details
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 sigmadelta 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 +5 V supply and accepts seven unipolar analog input ranges: 0 to +20 mV, +40 mV, +80 mV, +160 mV, +320 mV, +640 mV and +1.28 V, and seven bipolar ranges: ±20 mV, ±40 mV, ±80 mV, ±160 mV, ±320 mV, ±640 mV and ±1.28 V. The peak-to-peak resolution achievable directly from the part is 16 bits at an 800 Hz 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 5 nV/°C and a gain drift of less than 2 ppm/°C.
The part is available in a 24-lead plastic DIP, a 24-lead SOIC and 24-lead TSSOP package.
**Applications**
Process Control
PLCs/DCS
Industrial Instrumentation
### Features and Benefits
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
_FAST_Step™* Mode for Channel Sequencing
Single Supply Operation
* FASTStep is a trademark of Analog Devices, Inc.

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