AD7790

PRODUCTION

16-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 $4.17

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Overview

Power
- Supply: 2.5 V to 5.25 V operation
- Normal: 75 µA maximum
- Power-down: 1 µA maximum
16-bit p-p resolution
Integral nonlinearity: 3.5 ppm typical
Simultaneous 50 Hz and 60 Hz rejection

Internal clock oscillator
Programmable gain amplifier
Rail-to-rail input buffer
V_DD monitor channel
Temperature range: –40°C to +105°C
10-lead MSOP

The AD7790/AD7791 are low-power, complete analog front ends for low frequency measurement applications. The device consumes 65 µA of current typically when operated with a 3 V power supply and 75 µA typical when operated with a 5 V power supply with the buffer disabled. The AD7791 contains a 24-bit S-D ADC with one differential input, which can be buffered or unbuffered. The AD7790 is a 16-bit version of the AD7791. The AD7790 has a peak-to-peak resolution of 16 bits at the default output data rate of 16.6 Hz while the AD7789 has a peak to peak resolution of 19 bits, which is equivalent to an effective resolution of 21.5 bits at this output data rate.

The device operates from an internal clock. Therefore, the user does not have to supply a clock source to the device. The output data rate from the part is software programmable, allowing rates from 9.5 Hz to 120 Hz. The p-p resolution from the part varies with the programmed output data rate. With an output data rate of 16.6 Hz, simultaneous 50 Hz/60 Hz rejection is achieved. Power supply monitoring is also included.

The part can be used in single conversion mode whereby the device powers up, performs a single conversion and then returns to powerdown mode. Alternatively, it can be operated in continuous mode. In continuous conversion mode, the part can be configured to continuously read i.e. the conversions are placed on the serial bus automatically as soon as a conversion is complete (the user does not need to write to the ADC to read the data), assuming that the serial clock is applied to the device.

The AD7790/AD7791 is housed in a 10-lead MSOP package.

Part Models: 2
1ku List Price: Starting From $4.17

Documentation

Frequently Asked Question 1

FAQ 06/17/2015

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
AD7790BRMZ	10-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
AD7790BRMZ-REEL	10-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Jul 1, 2025 - 25_0162 Gold to Copper Wire Conversion
		PCN25_0162_Form Material_Report Qualification Results Summary Qualification Results Summary Qualification Results Summary
AD7790BRMZ	PRODUCTION
AD7790BRMZ-REEL	PRODUCTION
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
AD7790BRMZ	PRODUCTION
AD7790BRMZ-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
AD7790BRMZ	PRODUCTION
AD7790BRMZ-REEL	PRODUCTION

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

Software Resources

Device Drivers 2

Can't find the software or driver you need?

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 Electrochemical Gas Detection Circuit (CN0357)

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Features and Benefits

Form Factor Compatible with Arduino
Programmable for multiple other gases
Resolution down to 1ppm
Low power, single supply operation

Product Details

CN0357 single-supply, low noise, portable gas detector circuit using an electrochemical sensor. The Alphasense CO-AX carbon monoxide sensor is used in this example. Electrochemical sensors offer several advantages for instruments that detect or measure the concentration of many toxic gases. Most sensors are gas specific and have usable resolutions under one part per million (ppm) of gas concentration.