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AD7791 Datasheet

AD7791 Datasheet

24-Bit, Single-Channel, Ultra Low Power, Sigma Delta A/D Converter
Part No.: AD7791
Page: 20 Pages
Size: 453 KB
Manufacturer: Analog Devices, Inc.
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Views: 1
Update Time: 2024-01-03 10:33:57
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AD7791 Datasheet Applicable Part

Part No. Packing SPQ Marking MSL Pins Temp Range Package Description Buy
AD7791BRM Tube     1 10 -40°C ~ 105°C 10-Lead Mini Small Outline Package (MSOP)  
AD7791BRMZ Tube 50   1 10 -40°C ~ 105°C 10-Lead Mini Small Outline Package (MSOP)  
AD7791BRM-REEL Reel     1 10 -40°C ~ 105°C 10-Lead Mini Small Outline Package (MSOP)  
AD7791BRMZ-REEL Reel 3000   1 10 -40°C ~ 105°C 10-Lead Mini Small Outline Package (MSOP)  
SPQ:Standard Pack Quantity;MSL:Moisture Sensitivity Level

AD7791 Datasheet(PDF)

AD7791 Datasheet(Picture)

AD7791 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

AD7791 Applications

  • Smart transmitters
  • Battery applications
  • Portable instrumentation
  • Sensor measurement
  • Temperature measurement
  • Pressure measurement
  • Weigh scales
  • 4 to 20 mA loops 

AD7791 Description

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

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