AD7791
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AD7791

24-Bit, Single-Channel, Ultra Low Power, Sigma Delta A/D Converter

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Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 2
1ku List Price Starting From $5.41
Features
  • Power
    Supply: 2.5 V to 5.25 V operation
    Normal: 75 µA maximum
    Power-down: 1 µA maximum
  • RMS noise: 1.1 µV at 9.5 Hz update rate
  • 19.5-bit p-p resolution (22 bits effective resolution)
  • Integral nonlinearity: 3.5 ppm typical
  • Simultaneous 50 Hz and 60 Hz rejection
  • Internal clock oscillator
  • Rail-to-rail input buffer
  • VDD monitor channel
  • Temperature range: –40°C to +105°C
  • 10-lead MSOP
Additional Details
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The AD7790/AD7791 are low-power, complete analog front ends for low frequency measurement applications. The device consumes 65 µA of current typically when operated with a 3 V power supply and 75 µA typical when operated with a 5 V power supply with the buffer disabled. The AD7791 contains a 24-bit S-D ADC with one differential input, which can be buffered or unbuffered. The AD7790 is a 16-bit version of the AD7791. The AD7790 has a peak-to-peak resolution of 16 bits at the default output data rate of 16.6 Hz while the AD7789 has a peak to peak resolution of 19 bits, which is equivalent to an effective resolution of 21.5 bits at this output data rate.

The device operates from an internal clock. Therefore, the user does not have to supply a clock source to the device. The output data rate from the part is software programmable, allowing rates from 9.5 Hz to 120 Hz. The p-p resolution from the part varies with the programmed output data rate. With an output data rate of 16.6 Hz, simultaneous 50 Hz/60 Hz rejection is achieved. Power supply monitoring is also included.

The part can be used in single conversion mode whereby the device powers up, performs a single conversion and then returns to powerdown mode. Alternatively, it can be operated in continuous mode. In continuous conversion mode, the part can be configured to continuously read i.e. the conversions are placed on the serial bus automatically as soon as a conversion is complete (the user does not need to write to the ADC to read the data), assuming that the serial clock is applied to the device.

The AD7790/AD7791 is housed in a 10-lead MSOP package.

Part Models 2
1ku List Price Starting From $5.41

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Documentation

Documentation

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Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
AD7791BRMZ
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AD7791BRMZ-REEL
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Part Models

Product Lifecycle

PCN

Jan 26, 2016

- 15_0176

Assembly Transfer of Select 8/10L MSOP Products to Amkor Philippines

May 15, 2012

- 10_0006

Halogen Free Material Change for mini SOIC Products

Filter by Model

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Reset Filters

Part Models

Product Lifecycle

PCN

Jan 26, 2016

- 15_0176

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Assembly Transfer of Select 8/10L MSOP Products to Amkor Philippines

May 15, 2012

- 10_0006

arrow down

Halogen Free Material Change for mini SOIC Products

Software & Part Ecosystem

Software & Part Ecosystem

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Evaluation Kit

Evaluation Kits 2

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EVAL-AD7791

AD7791 Evaluation Board

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EVAL-AD7791

AD7791 Evaluation Board

AD7791 Evaluation Board

Features and Benefits

  • Full featured evaluation board for the AD7791
  • Standalone USB interface
  • Various linking options
  • PC software for control of AD7791

Product Detail

The EVAL-AD7791EBZ is a fully featured evaluation board for the AD7791,  a low power, 24-bit Σ-Δ analog-to-digital converter (ADC). The AD7791 is a complete analog front end for low frequency measurement applications. It is a low power device, consuming 65 μA typically with a 3 V power supply. It has an on-chip clock, which eliminates the need for an external clock. It employs a Σ-Δ conversion technique to realize up to 24 bits of no missing codes performance. The input signal is applied to an analog modulator. The modulator output is processed by an on-chip digital filter. The analog input channel of the AD7791 accepts analog input signals of ±VREF. At an output data rate of 16.6 Hz, the AD7791 has a peak-to-peak resolution of 19 bits. Simultaneous 50 Hz/60 Hz rejection is also available at this output data rate.

Full data on the AD7791 is available in the AD7791 data sheet from Analog Devices, Inc. It is recommended that the AD7791 data sheet be consulted in conjunction with this user guide when using the evaluation board.
The evaluation board interfaces to the USB port of a PC. Software that allows users to easily communicate with the AD7791 is available with the evaluation board.

The AD7791 evaluation board software must be installed before connecting the AD7791 evaluation board to the PC.

Another component on the AD7791 evaluation board is the ADP3303 high precision, low power, 3.3 V output voltage regulator, which powers the USB/serial peripheral interface (SPI).
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EVAL-CN0216-ARDZ

Arduino Compatible High Gain Weigh Scale Design (CN0216)

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EVAL-CN0216-ARDZ

Arduino Compatible High Gain Weigh Scale Design (CN0216)

Arduino Compatible High Gain Weigh Scale Design (CN0216)

Features and Benefits

  • Form Factor Compatible with Arduino
  • Usable for 4- or 6- wire sensors
  • High gain of 400, for wide bridge sensor ranges
  • Low power, single supply operation

Product Detail

CN-0216 is a precision weigh scale signal conditioning system. It uses the AD7791, a low power buffered 24-bit sigma-delta ADC along with dual external ADA4528-1 zero-drift amplifiers. This solution allows for high dc gain with a single supply.

This circuit allows great flexibility in designing a custom low-level signal conditioning front end that gives the user the ability to easily optimize the overall transfer function of the combined sensor-amplifier-converter circuit.

Reference Designs

Reference Designs 1

Weigh Scale System Using the AD7791

Precision Weigh Scale Design Using the AD7791 24-Bit Sigma-Delta ADC with External ADA4528-1 Zero-Drift Amplifiers

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CN0216

Precision Weigh Scale Design Using the AD7791 24-Bit Sigma-Delta ADC with External ADA4528-1 Zero-Drift Amplifiers

CN0216

Circuits from the lab

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Precision Weigh Scale Design Using the AD7791 24-Bit Sigma-Delta ADC with External ADA4528-1 Zero-Drift Amplifiers

Features and Benefits

  • High gain of 400 using zero drift amps
  • Typical connection to weigh scales with low output signals
  • Performance metrics maintained through 120 Hz
  • Precision weigh scale application circuit
  • Low power and low noise
View Detailed Reference Design external link

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