AD7794
6-Channel, Low Noise, Low Power, 24-Bit Sigma Delta ADC with On-Chip In-Amp and Reference
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Features
- 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
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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
Ask a Question
Submit your question below and we will return the best answer from ADI’s knowledge database:
Search
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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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AD7794
Documentation
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Data Sheet 1
Application Note 13
AN-880: ADC Requirements for Temperature Measurement Systems (Rev.0)
AN-968: Current Sources: Options and Circuits (Rev.0)
AN-101: Cross Plot Generator Allows Quick A/D Converter Evaluation
AN-397: Electrically Induced Damage to Standard Linear Integrated Circuits:
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-283: Sigma-Delta ADCs and DACs
AN-347: Shielding and Guarding
AN-311: How to Reliably Protect CMOS Circuits Against Power Supply Overvoltaging
AN-202: An IC Amplifier User’s Guide to Decoupling, Grounding, and Making Things Go Right for a Change (Rev.B)
AN-932: Power Supply Sequencing
AN-607: Selecting a Low Bandwidth (<15 kSPS) Sigma-Delta ADC
Product Highlight 1
Frequently Asked Question 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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| AD7794BRUZ |
24-Lead TSSOP
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| AD7794BRUZ-REEL |
24-Lead TSSOP
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| AD7794CRUZ |
24-Lead TSSOP
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| AD7794CRUZ-REEL |
24-Lead TSSOP
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- AD7794BRUZ
- Pin/Package Drawing
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24-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
- AD7794BRUZ-REEL
- Pin/Package Drawing
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24-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
- AD7794CRUZ
- Pin/Package Drawing
-
24-Lead TSSOP
- Documentation
-
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
- AD7794CRUZ-REEL
- Pin/Package Drawing
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24-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
AD7794BRUZ
PRODUCTION
AD7794BRUZ-REEL
PRODUCTION
AD7794CRUZ
PRODUCTION
AD7794CRUZ-REEL
PRODUCTION
Aug 10, 2021
- 21_0035
Amkor Philippines as an Alternate Site for TSSOP_4.4
AD7794BRUZ
PRODUCTION
AD7794BRUZ-REEL
PRODUCTION
AD7794CRUZ
PRODUCTION
AD7794CRUZ-REEL
PRODUCTION
Jul 23, 2014
- 13_0241
Qualification of ASE Chungli as an Alternate Assembly Site for Select 16L, 20L and 24L TSSOP Packages
AD7794BRUZ
PRODUCTION
AD7794BRUZ-REEL
PRODUCTION
AD7794CRUZ
PRODUCTION
AD7794CRUZ-REEL
PRODUCTION
Jan 20, 2012
- 11_0218
Halogen Free Material Change for Certain TSSOP Products at Carsem
AD7794BRUZ
PRODUCTION
AD7794BRUZ-REEL
PRODUCTION
AD7794CRUZ
PRODUCTION
AD7794CRUZ-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
AD7794BRUZ
PRODUCTION
AD7794BRUZ-REEL
PRODUCTION
AD7794CRUZ
PRODUCTION
AD7794CRUZ-REEL
PRODUCTION
Aug 10, 2021
- 21_0035
Amkor Philippines as an Alternate Site for TSSOP_4.4
AD7794BRUZ
PRODUCTION
AD7794BRUZ-REEL
PRODUCTION
AD7794CRUZ
PRODUCTION
AD7794CRUZ-REEL
PRODUCTION
Jul 23, 2014
- 13_0241
Qualification of ASE Chungli as an Alternate Assembly Site for Select 16L, 20L and 24L TSSOP Packages
AD7794BRUZ
PRODUCTION
AD7794BRUZ-REEL
PRODUCTION
AD7794CRUZ
PRODUCTION
AD7794CRUZ-REEL
PRODUCTION
Jan 20, 2012
- 11_0218
Halogen Free Material Change for Certain TSSOP Products at Carsem
AD7794BRUZ
PRODUCTION
AD7794BRUZ-REEL
PRODUCTION
AD7794CRUZ
PRODUCTION
AD7794CRUZ-REEL
PRODUCTION
Software & Part Ecosystem
| Parts | Product Life Cycle | Description | ||
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isoPower3 |
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PRODUCTION |
Quad-Channel, 2.5 kV Isolators with Integrated DC-to-DC Converter (3/1 channel directionality) |
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PRODUCTION |
Quad-Channel, 2.5 kV Isolators with Integrated DC-to-DC Converter (2/2 channel directionality) |
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PRODUCTION |
Quad-Channel, 2.5 kV Isolators with Integrated DC-to-DC Converter (1/3 channel directionality) |
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Series Voltage References5 |
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Ultralow Noise XFET® Voltage References with Current Sink and Source Capability |
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2.048 V and 2.5 V Bandgap Voltage References |
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2.5V Micropower, Precisions Series Mode Voltage References |
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PRODUCTION |
2.5V Micropower, Low Noise Precision Voltage Reference with Shutdown |
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PRODUCTION |
Ultralow Noise, LDO XFET® 2.5V Voltage Reference w/Current Sink and Source |
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Shunt Voltage References1 |
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PRODUCTION |
2.5 V/3.0 V High Precision Reference |
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Standard Digital Isolators5 |
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PRODUCTION |
1 kV RMS Quad-Channel Digital Isolator |
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PRODUCTION |
1 kV RMS Quad-Channel Digital Isolator |
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PRODUCTION |
1 kV RMS Quad-Channel Digital Isolator |
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PRODUCTION |
Quad-Channel Digital Isolator (4/0 Channel Directionality) |
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PRODUCTION |
Dual-Channel Digital Isolator (2/0 Channel Directionality) |
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USB Isolators1 |
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PRODUCTION |
Full/Low Speed USB Digital Isolator |
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RECOMMENDED FOR NEW DESIGNS |
8-Channel, Low Noise, Low Power, 24-Bit, Sigma-Delta ADC with PGA and Reference |
Can't find the software or driver you need?
Request a Driver/SoftwareEvaluation Kits 1
EVAL-AD7794
AD7794 Evaluation Board
Product Detail
The EVAL-AD7794EBZ is a fully featured evaluation Board for the AD7794. 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
