AD7787 Low Power, 2-Channel 24-Bit Sigma-Delta ADC

The AD7787 is a low power, complete analog front end for low frequency measurement applications. It contains a low noise 24-bit Σ-Δ ADC with one differential input and one single-ended input that can be buffered or unbuffered.

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 and can be varied from 9.5 Hz to 120 Hz, with the rms noise equal to 1.1 µV at the lower update rate. The internal clock frequency can be divided by a factor of 2, 4, or 8, which leads to a reduction in the current consumption. The update rate, cutoff frequency, and settling time will scale with the clock frequency.

The part operates with a power supply from 2.5 V to 5.25 V. When operating from a 3 V supply, the power dissipation for the part is 225 µW maximum. It is housed in a 10-lead MSOP.

Features and Benefits
  • Power
    - Supply: 2.5 V to 5.25 V current
    - Normal: 75 µA max
    - Power-down: 1 µA max
  • 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
  • Interface
    - 3-wire serial 
    - SPI®, QSPI™, MICROWIRE™ and DSP compatible
    - Schmitt trigger on SCLK
Analog to Digital Converters
Reference Designs
Data Sheets
Documentnote
AD7787: Low Power, 2-Channel 24-Bit Sigma-Delta ADC Data Sheet (Rev. A)PDF 326 kB
Application Notes
Documentnote
AN-968: Current Sources: Options and Circuits (Rev. 0)PDF 131 kB
AN-607: Selecting a Low Bandwidth (<15 kSPS) Sigma-Delta ADC (Rev. E)PDF 222 kB
Order Information
Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
AD7787BRM Last Time Buy10 ld MSOPOTH 50-40 to 105C00N
AD7787BRM-REEL Last Time Buy10 ld MSOPREEL 3000-40 to 105C00N
AD7787BRMZ Production10 ld MSOPOTH 50-40 to 105C5.824.88Y
AD7787BRMZ-RL Production10 ld MSOPREEL 3000-40 to 105C04.88Y
Reference Materials
AD7787: Low Power, 2-Channel 24-Bit Sigma-Delta ADC Data Sheet (Rev. A) ad7787
CN0354 Design & Integration Files adg1609
AN-607: 选择低带宽(<15kSPS)Σ-Δ型ADC (Rev. E) ad7701
AN-968: 电流源:方案与电路 (Rev. 0) ad7783
AN-968: Current Sources: Options and Circuits (Rev. 0) ad7783
AN-607: Selecting a Low Bandwidth (<15 kSPS) Sigma-Delta ADC (Rev. E) ad7701
MS-2210:高速ADC的电源设计 ad9861