AD7785
3-Channel, Low Noise, Low Power, 20-Bit Σ-Δ ADC with On-Chip In-Amp and Reference
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Features
- Up to 20 bits effective resolution
- RMS noise
- 40 nV @ 4.17 Hz
- 85 nV @ 16.7 Hz
- Current: 400 µA typ
- Power-down: 1 µA max
- Low noise programmable gain instrumentation amp
- Band gap reference with 4 ppm/°C drift typ
- Update rate: 4.17 Hz to 470 Hz
- 3 differential inputs
- Simultaneous 50 Hz/60 Hz rejection
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The AD7785 is a low power, low noise, complete analog front ends for high precision measurement applications. It contains a low noise 20-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 device contains a precision low noise, low drift internal band gap reference and can also 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 being used to set the common-mode voltage of a channel to AVDD/2.
The device can be operated with either the internal clock or an external clock. 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. It consumes a current of 400 µA typical and is housed in 16-lead TSSOP packages.
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
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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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AD7785
Documentation
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Documentation
Data Sheet 1
Application Note 12
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-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-202: An IC Amplifier User’s Guide to Decoupling, Grounding, and Making Things Go Right for a Change (Rev.B)
Technical Articles 1
Device Drivers 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 |
|---|---|---|---|
| AD7785BRUZ |
16-Lead TSSOP
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| AD7785BRUZ-REEL |
16-Lead TSSOP
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- AD7785BRUZ
- 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
- AD7785BRUZ-REEL
- Pin/Package Drawing
-
16-Lead TSSOP
- Documentation
-
HTML
Material Declaration
-
HTML
Reliablity Data
- CAD Symbols, Footprints, and 3D Models
-
Ultra Librarian
-
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
AD7785BRUZ
PRODUCTION
AD7785BRUZ-REEL
PRODUCTION
Apr 5, 2021
- 21_0035
Amkor Philippines as an Alternate Site for TSSOP_4.4
AD7785BRUZ
PRODUCTION
AD7785BRUZ-REEL
PRODUCTION
Jan 20, 2012
- 11_0218
Halogen Free Material Change for Certain TSSOP Products at Carsem
AD7785BRUZ
PRODUCTION
AD7785BRUZ-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
AD7785BRUZ
PRODUCTION
AD7785BRUZ-REEL
PRODUCTION
Apr 5, 2021
- 21_0035
Amkor Philippines as an Alternate Site for TSSOP_4.4
AD7785BRUZ
PRODUCTION
AD7785BRUZ-REEL
PRODUCTION
Jan 20, 2012
- 11_0218
Halogen Free Material Change for Certain TSSOP Products at Carsem
AD7785BRUZ
PRODUCTION
AD7785BRUZ-REEL
PRODUCTION
Software & Part Ecosystem
Device Drivers
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Request a Driver/SoftwareEvaluation Kits 1
EVAL-AD7785
AD7785 Evaluation Board
Product Detail
The EVAL-AD7785EBZ is a fully featured evaluation Board for the AD7785. 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
