AD7798
3-Channel, Low Noise, Low Power, 16-Bit, Sigma Delta ADC with On-Chip In-Amp
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Features
- 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
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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
Ask a Question
Submit your question below and we will return the best answer from ADI’s knowledge database:
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Support
Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.
Visit the ADI Support Page
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AD7798
Documentation
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Documentation
Data Sheet 1
Application Note 14
AN-101: Cross Plot Generator Allows Quick A/D Converter Evaluation
AN-388: Using Sigma-Delta Converters-Part 1
AN-389: Using Sigma-Delta Converters-Part 2
AN-615: Peak-to-Peak Resolution Versus Effective Resolution (Rev.0)
AN-607: Selecting a Low Bandwidth (<15 kSPS) Sigma-Delta ADC (Rev.E)
AN-311: How to Reliably Protect CMOS Circuits Against Power Supply Overvoltaging
AN-968: Current Sources: Options and Circuits (Rev.0)
AN-397: Electrically Induced Damage to Standard Linear Integrated Circuits:
AN-1479: ADuCM4050 SPI Flow Control Modes (Rev.0)
AN-283: Sigma-Delta ADCs and DACs
AN-347: Shielding and Guarding
AN-202: An IC Amplifier User’s Guide to Decoupling, Grounding, and Making Things Go Right for a Change (Rev.B)
AN-2565: Single Supply, Micropower Toxic Gas Detector Using an Electrochemical Sensor
AN-607: Selecting a Low Bandwidth (<15 kSPS) Sigma-Delta ADC
Frequently Asked Question 1
Circuit Note 4
Device Drivers 2
Rarely Asked Question Page 1
Analog Dialogue 1
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 |
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| AD7798BRUZ |
16-Lead TSSOP
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| AD7798BRUZ-REEL |
16-Lead TSSOP
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- AD7798BRUZ
- Pin/Package Drawing
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16-Lead TSSOP
- Documentation
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HTML
Material Declaration
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HTML
Reliablity Data
- CAD Symbols, Footprints, and 3D Models
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Ultra Librarian
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SamacSys
- AD7798BRUZ-REEL
- Pin/Package Drawing
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16-Lead TSSOP
- Documentation
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HTML
Material Declaration
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HTML
Reliablity Data
- CAD Symbols, Footprints, and 3D Models
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Ultra Librarian
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SamacSys
Filter by Model
Part Models
Product Lifecycle
PCN
May 20, 2024
- 23_0143
Qualification of an Alternate Wafer Fab Site for 0.5um TSMC CMOS Process
AD7798BRUZ
PRODUCTION
AD7798BRUZ-REEL
PRODUCTION
Apr 5, 2021
- 21_0035
Amkor Philippines as an Alternate Site for TSSOP_4.4
AD7798BRUZ
PRODUCTION
AD7798BRUZ-REEL
PRODUCTION
Jan 20, 2012
- 11_0218
Halogen Free Material Change for Certain TSSOP Products at Carsem
AD7798BRUZ
PRODUCTION
AD7798BRUZ-REEL
PRODUCTION
Filter by Model
Part Models
Product Lifecycle
PCN
May 20, 2024
- 23_0143
Qualification of an Alternate Wafer Fab Site for 0.5um TSMC CMOS Process
AD7798BRUZ
PRODUCTION
AD7798BRUZ-REEL
PRODUCTION
Apr 5, 2021
- 21_0035
Amkor Philippines as an Alternate Site for TSSOP_4.4
AD7798BRUZ
PRODUCTION
AD7798BRUZ-REEL
PRODUCTION
Jan 20, 2012
- 11_0218
Halogen Free Material Change for Certain TSSOP Products at Carsem
AD7798BRUZ
PRODUCTION
AD7798BRUZ-REEL
PRODUCTION
Software & Part Ecosystem
Device Drivers
Looking for Evaluation Software? You can find it here
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Low Input Bias Current Op Amps (≤100 pA)3 |
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PRODUCTION |
10 µA, RRIO, Zero Input Crossover Distortion Dual Op Amp |
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1.8V, µPower, Zero-Drift, RRIO Dual Amplifier |
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PRODUCTION |
16V Dual Auto-Zero, Rail-to-Rail Output, Precision Amplifier |
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Precision Op Amps (Vos ≤1mV & TCVos ≤2uV/C)1 |
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PRODUCTION |
Low Power, Precision, Auto-Zero Op Amp |
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Series Voltage References4 |
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PRODUCTION |
2.048 V and 2.5 V Bandgap Voltage References |
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PRODUCTION |
2.5V Micropower, Low Noise Precision Voltage Reference with Shutdown |
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PRODUCTION |
Ultraprecision, Low Noise, 2.500 V XFET® Voltage References |
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PRODUCTION |
Ultralow Noise XFET® Voltage References with Current Sink and Source Capability |
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Can't find the software or driver you need?
Request a Driver/SoftwareEvaluation Kits 1
EVAL-AD7798
AD7798 Evaluation Board
Product Detail
The EVAL-AD7798EBZ is a fully featured evaluation Board for the AD7798. 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).
Resources
Evaluation Kits1
Tools & Simulations 2
Design Tool
Design Tool
Sigma-Delta ADC Tutorial
Reference Designs 5
cn0234
Single Supply, Micropower Toxic Gas Detector Using an Electrochemical Sensor
Circuits from the lab
Info:Circuits from the lab
cn0312
Dual-Channel Colorimeter with Programmable Gain Transimpedance Amplifiers and Synchronous Detectors
Circuits from the lab
Info:Circuits from the lab
Resources
CN0396
Dual Electrochemical Gas Sensor with Temperature Compensation
Circuits from the lab
Info:Circuits from the lab
CN0397
Ultralow Power Light Recognition System for Smart Agriculture
Circuits from the lab
Info:Circuits from the lab
cn0548
Isolated High Voltage, High Current, Measurement Module
Circuits from the lab
Info:Circuits from the lab
Videos
2022-05-13
01:02
CN0548: Isolated High Voltage, High Current, Measurement Module
Reference Designs5
cn0234
Single Supply, Micropower Toxic Gas Detector Using an Electrochemical Sensor
cn0312
Dual-Channel Colorimeter with Programmable Gain Transimpedance Amplifiers and Synchronous Detectors
CN0396
Dual Electrochemical Gas Sensor with Temperature Compensation
CN0397
Ultralow Power Light Recognition System for Smart Agriculture
cn0548
Isolated High Voltage, High Current, Measurement Module
