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AD7792
3-Channel, Low Noise, Low Power, 16-Bit Sigma Delta ADC with On-Chip In-Amp and Reference
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
Application Notes (12)
Frequently Asked Questions (1)
Software & Systems Requirements
Tools & Simulations
Design Tools
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
Reference Materials
Technical Articles (4)
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
Sample & Buy
The USA 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. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
