Alternative Parts

  • AD7124-8
    AD7124-8

    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 effective bits
  • 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
  • Six differential analog inputs
  • Internal clock oscillator
  • Simultaneous 50 Hz/60 Hz rejection
  • Reference detect
  • Programmable current sources

Product Details

The AD7794/AD7795 are low power, low noise, complete analog front ends for high precision measurement applications. They contain a low noise, 24-/16-bit Σ-Δ ADC with six differential inputs. The on-chip low noise instrumentation amplifier means that signals of small amplitude can be interfaced directly to the ADC.

Each device contains a precision, low noise, low drift internal band gap reference, and can also accept up to two external differential references. Other on-chip features include programmable excitation current sources, burnout currents, and a bias voltage generator that is used to set the common-mode voltage of a channel to AVDD/2. The low-side power switch can be used to power down bridge sensors between conversions, minimizing the system’s power consumption. The AD7794/AD7795 can operate with either an internal clock or an external clock. The output data rate from each part can vary from 4.17 Hz to 470 Hz.

Both parts operate with a power supply from 2.7 V to 5.25 V. The B-grade parts (AD7794 and AD7795) are specified for a temperature range of −40°C to +105°C while the C-grade part (AD7794) is specified for a temperature range of −40°C to +125°C. They consume a current of 400 μA typical and are housed in a 24-lead TSSOP.

Applications

  • Temperature measurement
  • Pressure measurement
  • Weigh scales
  • Strain gage transducers
  • Gas analysis

Product Lifecycle icon-recommended 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)

Tools & Simulations

Design Tools

Sigma-Delta ADC Tutorial

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

Product Recommendations

AD7794 Companion Parts

Recommended Digital Isolators

Recommended High Accuracy, Precision References - 2.5V

  • For high output current applications: ADR431.
  • For wide supply applications: AD780.
  • For cost sensitive applications: ADR381, AD1582, ADR391.
  • For applications requiring the lowest noise performance and and low power output trim adjust: ADR441.

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

Discussions

AD7794 Discussions

RE: Using AD7794 with FDA AD8475 in the front end.
8 week(s) ago in Precision ADCs
RE: Large signal into lower-range ADC?
9 week(s) ago in ADC Drivers
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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.


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Evaluation Boards Pricing displayed is based on 1-piece.
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.