AD7792
3-Channel, Low Noise, Low Power, 16-Bit Sigma Delta ADC with On-Chip In-Amp and Reference
Top
Alternative Parts
AD7124-4
Lower power and lower noise, completed signal chain integration with diagnostic features for functional safety, easier evaluation and reduced design time
Overview
Features and Benefits
- Up to 23 bits effective resolution
- RMS noise
- 40 nV @ 4.17 Hz
- 85 nV @ 16.7 Hz
- Current: 400 μA typical
- Power-down: 1 μA maximum
- Low noise programmable gain instrumentation amp
- Band gap reference with 4 ppm/°C drift typical
- Update rate: 4.17 Hz to 470 Hz
- 3 differential inputs
- Internal clock oscillator
- Simultaneous 50 Hz/60 Hz rejection
Product Details
The AD7792/AD7793 are low power, low noise, complete analog front ends for high precision measurement applications. The AD7792/AD7793 contain 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 40 nV when the update rate equals 4.17 Hz.
The devices contain a precision low noise, low drift internal band gap reference and can accept an external differential reference. Other on-chip features include programmable excitation current sources, burnout currents, and a bias voltage generator. The bias voltage generator sets the common-mode voltage of a channel to AVDD/2.
The devices can be operated with either the internal clock or an external clock. The output data rate from the parts is software-programmable and can be varied from 4.17 Hz to 470 Hz.
The parts operate with a power supply from 2.7 V to 5.25 V. They consume a current of 400 μA typical and are housed in a 16-lead TSSOP package.
Applications
- Thermocouple measurements
- RTD measurements
- Thermistor measurements
- Gas analysis
- Industrial process control
- Instrumentation
- Portable instrumentation
- Blood analysis
- Smart transmitters
- Liquid/gas chromatography
- 6-digit DVM
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Documentation & Resources
-
AN-202: An IC Amplifier User’s Guide to Decoupling, Grounding, and Making Things Go Right for a Change (Rev. B)2/14/2015PDF76 K
-
AN-389: Using Sigma-Delta Converters-Part 22/14/2015PDF590 kB
-
AN-388: Using Sigma-Delta Converters-Part 12/14/2015PDF590 kB
-
AN-880: ADC Requirements for Temperature Measurement Systems (Rev. 0)2/14/2015PDF423 kB
-
AN-347: Shielding and Guarding2/14/2015PDF688 kB
-
AN-968: Current Sources: Options and Circuits (Rev. 0)10/22/2008PDF131 kB
-
AN-311: How to Reliably Protect CMOS Circuits Against Power Supply Overvoltaging3/8/2008PDF217 kB
-
AN-607: Selecting a Low Bandwidth (<15 kSPS) Sigma-Delta ADC (Rev. E)10/12/2006PDF222 kB
-
AN-615: Peak-to-Peak Resolution Versus Effective Resolution (Rev. 0)12/21/2004PDF70 kB
-
AN-101: Cross Plot Generator Allows Quick A/D Converter Evaluation12/12/2002PDF280 kB
-
AN-397: Electrically Induced Damage to Standard Linear Integrated Circuits:11/18/2002PDF149 kB
-
AN-283: Sigma-Delta ADCs and DACs9/24/2002PDF1699 kB
-
FAQs7/26/2017
-
PLC DCS Analog Input Module Design Breaks Barriers in Channel-to-Channel Isolation and High Density12/1/2016 Analog Dialogue
-
pH Sensor Reference Design Enabled for RF Wireless Transmission11/1/2016
-
Minimizing Errors in Multiplexed 3-Wire RTD Data-Acquisition Systems9/1/2013 Analog Dialogue
-
Precision Signal-Processing and Data-Conversion ICs for PLCs Now Have More Performance at Less Power, Size, and Cost8/1/2006 Analog Dialogue
Software & Systems Requirements
Tools & Simulations
Design Tools
XLS
AD7785/AD7790/AD7791/AD7792/AD7793/AD7794/AD7795/AD7796/AD7797/AD7798/AD7799 Digital Filter Model
280.5 K
Sigma-Delta ADC Tutorial
An interactive illustration showing the behavior of an idealized sigma-delta A/D converter.
Product Recommendations
AD7792 Companion Parts
Recommended Digital Isolators
- For cost sensitive designs: ADUM7440, ADUM7441, ADUM7442.
- For isolated USB designs in healthcare and industrial control: ADUM4160.
- For digital isolators with integrated isolated power: ADUM5401, ADUM5402, ADUM5403.
- For process control applications: ADUM1400, ADUM1200.
Recommended High Accuracy, Precision References - 2.5V
Design Resources
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.
PCN-PDN Information
Support & Discussions
AD7792 Discussions
RE: Questions about output waveform at Iout pin of AD7792 and AD7785
3 week(s) ago in Precision ADCs
Sample & Buy
Ordering FAQs
See our Ordering FAQs for answers to questions about online orders, payment options and more.
Buy Now Pricing
(**) Displayed Buy Now Price and Price Range is based on small quantity orders.
List Pricing
(*)The 1Ku list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
Sampling
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.
Evaluation Boards
Pricing displayed is based on 1-piece.
Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.