AD7791

PRODUCTION

24-Bit, Single-Channel, Ultra Low Power, Sigma Delta A/D Converter

Data Sheet (Rev. A) Product Selection Table

Part Models: 2
1ku List Price: Starting From $5.41

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Part Details

Power
Supply: 2.5 V to 5.25 V operation
Normal: 75 µA maximum
Power-down: 1 µA maximum
RMS noise: 1.1 µV at 9.5 Hz update rate
19.5-bit p-p resolution (22 bits effective resolution)
Integral nonlinearity: 3.5 ppm typical

Simultaneous 50 Hz and 60 Hz rejection
Internal clock oscillator
Rail-to-rail input buffer
V_DD monitor channel
Temperature range: –40°C to +105°C
10-lead MSOP

Part Models: 2
1ku List Price: Starting From $5.41

Documentation

Frequently Asked Question 1

FAQ 03/20/2018

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
AD7791BRMZ	10-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
AD7791BRMZ-REEL	10-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Jan 26, 2016 - 15_0176 Assembly Transfer of Select 8/10L MSOP Products to Amkor Philippines
		PCN15_0176_Form Material_Report Detailed Change Description Qualification Results Summary Qualification Results Summary
AD7791BRMZ	PRODUCTION
AD7791BRMZ-REEL	PRODUCTION
May 15, 2012 - 10_0006 Halogen Free Material Change for mini SOIC Products
		PCN10_0006_Form Material_Report Qualification Report Summary Qualification Report Summary
AD7791BRMZ	PRODUCTION
AD7791BRMZ-REEL	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

FPGA/HDL 2

Can't find the software or driver you need?

Hardware Ecosystem

Parts	Product Life Cycle	Description
Low Input Bias Current Op Amps (≤100 pA) 3
AD8638	PRODUCTION	16 V Auto-Zero, Rail-to-Rail Output Operational Amplifier
AD8639	PRODUCTION	16V Dual Auto-Zero, Rail-to-Rail Output, Precision Amplifier
ADA4051-2	PRODUCTION	1.8V, µPower, Zero-Drift, RRIO Dual Amplifier
Product 1
ADR390	Obsolete	2.048 V Micropower, Low Noise Precision Voltage References with Shutdown

Series Voltage References 3
ADR381	PRODUCTION	2.048 V and 2.5 V Bandgap Voltage References
ADR380	PRODUCTION	2.048 V Bandgap Voltage Reference
ADR3420	PRODUCTION	Micro-Power, High-Accuracy 2.048V Voltage Reference

Parts	Product Life Cycle	Description
AD7124-4	RECOMMENDED FOR NEW DESIGNS	4-Channel, Low Noise, Low Power, 24-Bit, Sigma-Delta ADC with PGA and Reference

Tools & Simulations

Design Tool 1

AD7785/AD7790/AD7791/AD7792/AD7793/AD7794/AD7795/AD7796/AD7797/AD7798/AD7799 Digital Filter Model

Sigma-Delta ADC Tutorial

An interactive illustration showing the behavior of an idealized sigma-delta A/D converter.

Open Tool

Evaluation Kits

Arduino Compatible High Gain Weigh Scale Design (CN0216)

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Features and Benefits

Form Factor Compatible with Arduino
Usable for 4- or 6- wire sensors
High gain of 400, for wide bridge sensor ranges
Low power, single supply operation

Product Details

CN-0216 is a precision weigh scale signal conditioning system. It uses the AD7791, a low power buffered 24-bit sigma-delta ADC along with dual external ADA4528-1 zero-drift amplifiers. This solution allows for high dc gain with a single supply.

This circuit allows great flexibility in designing a custom low-level signal conditioning front end that gives the user the ability to easily optimize the overall transfer function of the combined sensor-amplifier-converter circuit.

Resources

EVAL-CN0216-ARDZ Design & Integration Files
2.92 M

CN0216 Shield Evaluation Board User Guide

Software

CN0216 C Project using ADICUP360

Example Projects using CN0216

AD7791 Evaluation Board

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Features and Benefits

Full featured evaluation board for the AD7791
Standalone USB interface
Various linking options
PC software for control of AD7791

Product Details

The EVAL-AD7791EBZ is a fully featured evaluation board for the AD7791, a low power, 24-bit Σ-Δ analog-to-digital converter (ADC). The AD7791 is a complete analog front end for low frequency measurement applications. It is a low power device, consuming 65 μA typically with a 3 V power supply. It has an on-chip clock, which eliminates the need for an external clock. It employs a Σ-Δ conversion technique to realize up to 24 bits of no missing codes performance. The input signal is applied to an analog modulator. The modulator output is processed by an on-chip digital filter. The analog input channel of the AD7791 accepts analog input signals of ±VREF. At an output data rate of 16.6 Hz, the AD7791 has a peak-to-peak resolution of 19 bits. Simultaneous 50 Hz/60 Hz rejection is also available at this output data rate.

Full data on the AD7791 is available in the AD7791 data sheet from Analog Devices, Inc. It is recommended that the AD7791 data sheet be consulted in conjunction with this user guide when using the evaluation board.
The evaluation board interfaces to the USB port of a PC. Software that allows users to easily communicate with the AD7791 is available with the evaluation board.

The AD7791 evaluation board software must be installed before connecting the AD7791 evaluation board to the PC.

Another component on the AD7791 evaluation board is the ADP3303 high precision, low power, 3.3 V output voltage regulator, which powers the USB/serial peripheral interface (SPI).