AD7799

PRODUCTION

3-Channel, Low Noise, Low Power, 24-Bit, Sigma Delta ADC with On-Chip In-Amp

Data Sheet (Rev. B) Product Selection Table

Part Models: 2
1ku List Price: Starting From $5.57

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Overview

RMS noise:
27 nV at 4.17 Hz (AD7799)
65 nV at 16.7 Hz (AD7799)
40 nV at 4.17 Hz (AD7798)
85 nV at 16.7 Hz (AD7798)
Current: 380 μA typical
Power-down: 1 μA maximum
Low noise, programmable gain, instrumentation amp
Update rate: 4.17 Hz to 470 Hz 3 differential inputs
Internal clock oscillator
Simultaneous 50 Hz/60 Hz rejection
Reference detect
Low-side power switch
Programmable digital outputs
Burnout currents
Power supply: 2.7 V to 5.25 V

The AD7798/AD7799 are low power, low noise, complete analog front ends for high precision measurement applications. The AD7798/AD7799 contains a low noise, 16-/24-bit Σ-Δ ADC with three differential analog inputs. The on-chip, low noise instrumentation amplifier means that signals of small amplitude can be interfaced directly to the ADC. With a gain setting of 64, the rms noise is 27 nV for the AD7799 and 40 nV for the AD7798 when the update rate equals 4.17 Hz.

On-chip features include a low-side power switch, reference detect, programmable digital output pins, burnout currents, and an internal clock oscillator. The output data rate from the part is software-programmable and can be varied from 4.17 Hz to 470 Hz.

The part operates with a power supply from 2.7 V to 5.25 V. The AD7798 consumes a current of 300 μA typical, whereas the AD7799 consumes 380 μA typical. Both devices are housed in a 16-lead TSSOP package.

Applications

Weigh scales
Pressure measurement
Strain gauge transducers
Gas analysis
Industrial process control
Instrumentation
Portable instrumentation
Blood analysis
Smart transmitters
Liquid/gas chromotography 6-digit DVM

Part Models: 2
1ku List Price: Starting From $5.57

Documentation

Data Sheet 1

AD7798/AD7799: 3-Channel, Low Noise, Low Power, 16-/24-Bit, Sigma Delta ADC with On-Chip In-Amp Data Sheet (Rev.B) 12/08/2004

Application Note 11

AN-202: An IC Amplifier User’s Guide to Decoupling, Grounding, and Making Things Go Right for a Change (Rev.B) 02/14/2015

AN-311: How to Reliably Protect CMOS Circuits Against Power Supply Overvoltaging 03/08/2008

AN-968: Current Sources: Options and Circuits (Rev.0) 10/22/2008

AN-101: Cross Plot Generator Allows Quick A/D Converter Evaluation 12/12/2002

AN-397: Electrically Induced Damage to Standard Linear Integrated Circuits: 11/18/2002

AN-615: Peak-to-Peak Resolution Versus Effective Resolution (Rev.0) 12/21/2004

AN-283: Sigma-Delta ADCs and DACs 09/24/2002

AN-347: Shielding and Guarding 02/14/2015

AN-388: Using Sigma-Delta Converters-Part 1 02/14/2015

AN-389: Using Sigma-Delta Converters-Part 2 02/14/2015

AN-607: Selecting a Low Bandwidth (<15 kSPS) Sigma-Delta ADC 10/01/2006

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
AD7799BRUZ	16-Lead TSSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
AD7799BRUZ-REEL	16-Lead TSSOP	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
AD7799BRUZ	PRODUCTION
AD7799BRUZ-REEL	PRODUCTION
May 20, 2024 - 23_0143 Qualification of an Alternate Wafer Fab Site for 0.5um TSMC CMOS Process
		PCN23_0143_Form Material_Report Detailed Change Description Delta Qualification Matrix Qualification Results Summary
AD7799BRUZ	PRODUCTION
AD7799BRUZ-REEL	PRODUCTION
Apr 5, 2021 - 21_0035 Amkor Philippines as an Alternate Site for TSSOP_4.4
		PCN21_0035_Form Material_Report Qualification Results Summary Other
AD7799BRUZ	PRODUCTION
AD7799BRUZ-REEL	PRODUCTION
Jan 20, 2012 - 11_0218 Halogen Free Material Change for Certain TSSOP Products at Carsem
		PCN11_0218_Form Material_Report Qualification Report Summary
AD7799BRUZ	PRODUCTION
AD7799BRUZ-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?

Hardware Ecosystem

Parts	Product Life Cycle	Description
Operational Amplifiers (Op Amps) 3
AD8639	PRODUCTION	16V Dual Auto-Zero, Rail-to-Rail Output, Precision Amplifier
ADA4051-2	PRODUCTION	1.8V, µPower, Zero-Drift, RRIO Dual Amplifier
AD8539	PRODUCTION	Low Power, Precision, Auto-Zero Op Amp
Voltage References 4
ADR381	PRODUCTION	2.048 V and 2.5 V Bandgap Voltage References

ADR391	PRODUCTION	2.5V Micropower, Low Noise Precision Voltage Reference with Shutdown
ADR421	PRODUCTION	Ultraprecision, Low Noise, 2.500 V XFET® Voltage References
ADR431	PRODUCTION	Ultralow Noise XFET^® Voltage References with Current Sink and Source Capability

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

Sigma-Delta ADC Tutorial

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

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Evaluation Kits

AD7799 Evaluation Board

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Product Details

The EVAL-AD7799EBZ is a fully featured evaluation Board for the AD7799. The evaluation board can be connected to a PC via a standard USB interface. Software is provided enabling the user to perform detailed analysis of the ADC's performance.

Please note: This Evaluation software does not run on Windows 8 or Windows 10 (USB driver is non-compliant with OS >Windows 7).