AD7798
3-Channel, Low Noise, Low Power, 16-Bit, Sigma Delta ADC with On-Chip In-Amp
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Overview
Features and Benefits
- RMSnoise:
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
- 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
- Update rate: 4.17 Hz to 470 Hz 3 differential inputs
Product Details
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
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
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AN-1479: ADuCM4050 SPI Flow Control Modes (Rev. 0)5/16/2019PDF272 K
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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
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AN-389: Using Sigma-Delta Converters-Part 22/14/2015PDF590 kB
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AN-388: Using Sigma-Delta Converters-Part 12/14/2015PDF590 kB
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AN-347: Shielding and Guarding2/14/2015PDF688 kB
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AN-968: Current Sources: Options and Circuits (Rev. 0)10/22/2008PDF131 kB
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AN-311: How to Reliably Protect CMOS Circuits Against Power Supply Overvoltaging3/8/2008PDF217 kB
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AN-607: Selecting a Low Bandwidth (<15 kSPS) Sigma-Delta ADC (Rev. E)10/12/2006PDF222 kB
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AN-615: Peak-to-Peak Resolution Versus Effective Resolution (Rev. 0)12/21/2004PDF70 kB
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AN-101: Cross Plot Generator Allows Quick A/D Converter Evaluation12/12/2002PDF280 kB
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AN-397: Electrically Induced Damage to Standard Linear Integrated Circuits:11/18/2002PDF149 kB
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AN-283: Sigma-Delta ADCs and DACs9/24/2002PDF1699 kB
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FAQs7/26/2017
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CN0396: Dual Electrochemical Gas Sensor with Temperature Compensation (Rev. 0)10/27/2016PDF215 K
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CN0397: Ultralow Power Light Recognition System for Smart Agriculture (Rev. 0)10/18/2016PDF266 K
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CN0312: Dual-Channel Colorimeter with Programmable Gain Transimpedance Amplifiers and Synchronous Detectors3/29/2013PDF404 kB
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CN-0234: Single Supply, Micropower Toxic Gas Detector Using an Electrochemical Sensor6/13/2012PDF386 kB
Software & Systems Requirements
Device Drivers
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.
Reference Designs (5)
Product Recommendations
AD7798 Companion Parts
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
AD7798 Discussions
Sample & Buy
Ordering FAQs
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Buy Now Pricing
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List Pricing
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Lead Times
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Sampling
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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.