AD7780
Info: : PRODUCTION
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AD7780

24-Bit Pin-Programmable Low Power Σ−Δ ADC

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Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 3
1ku List Price Starting From $4.79
Features
  • Pin-programmable filter response
    Update rate: 10 Hz or 16.7 Hz
  • Pin-programmable in-amp gain
  • Pin-programmable power-down and reset
  • Status function
  • Internal clock oscillator
  • Internal bridge power-down switch
  • Current
    115 μA typical (gain = 1)
    330 μA typical (gain = 128)
  • Please see data sheet for additional features
Additional Details
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The AD7780 is a complete low power front-end solution for bridge sensor products, including weigh scales, strain gages, and pressure sensors. It contains a precision, low power, 24-bit sigma-delta (Σ-Δ) ADC; an on-chip, low noise programmable gain amplifier (PGA); and an on-chip oscillator.

Consuming only 330 μA, the AD7780 is particularly suitable for portable or battery-operated products where very low power is required. The AD7780 also has a power-down mode that allows the user to switch off the power to the bridge sensor and power down the AD7780 when not converting, thus increasing the battery life of the product.

For ease of use, all the features of the AD7780 are controlled by dedicated pins. Each time a data read occurs, eight status bits are appended to the 24-bit conversion. These status bits contain a pattern sequence that can be used to confirm the validity of the serial transfer.

The on-chip PGA has a gain of 1 or 128, supporting a full-scale differential input of ±5 V or ±39 mV. The device has two filter response options. The filter response at the 16.7 Hz update rate provides superior dynamic performance. The settling time is 120 ms at this update rate. At the 10 Hz update rate, the filter response provides greater than −45 dB of stop-band attenuation. In load cell applications, this stop-band rejection is useful to reject low frequency mechanical vibrations of the load cell. The settling time is 300 ms at this update rate. Simultaneous 50 Hz/60 Hz rejection occurs at both the 10 Hz and 16.7 Hz update rates.

The AD7780 operates with a power supply from 2.7 V to 5.25 V. It is available in a narrow body, 14-lead SOIC package and a 16-lead TSSOP package.

Applications

  • Weigh scales
  • Pressure Measurement
  • Industrial Process Control
  • Portable instrumentation
Part Models 3
1ku List Price Starting From $4.79

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
AD7780BRUZ
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AD7780BRUZ-REEL
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AD7780BRZ
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Part Models

Product Lifecycle

PCN

Jan 20, 2012

- 11_0218

Halogen Free Material Change for Certain TSSOP Products at Carsem

Oct 5, 2010

- 10_0146

Halogen Free Material Change for 14/16L SOIC_N Products

Filter by Model

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Part Models

Product Lifecycle

PCN

Jan 20, 2012

- 11_0218

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Halogen Free Material Change for Certain TSSOP Products at Carsem

Oct 5, 2010

- 10_0146

arrow down

Halogen Free Material Change for 14/16L SOIC_N Products

Software & Part Ecosystem

Software & Part Ecosystem

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Evaluation Kit

Evaluation Kits 1

EVAL-AD7780

AD7780 Evaluation Board

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EVAL-AD7780

AD7780 Evaluation Board

AD7780 Evaluation Board

Product Detail

The EVAL-AD7780EBZ is a fully featured evaluation Board for the AD7780. 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).

Tools & Simulations

Tools & Simulations 1

Reference Designs

Reference Designs 1

Weigh Scale System Using the AD7780

Weigh Scale Design Using the AD7780 24-Bit Sigma-Delta ADC with Internal PGA

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CN0107

Weigh Scale Design Using the AD7780 24-Bit Sigma-Delta ADC with Internal PGA

CN0107

Circuits from the lab

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Weigh Scale Design Using the AD7780 24-Bit Sigma-Delta ADC with Internal PGA

Features and Benefits

  • 24-bit Weigh scale application circuit
  • Integrated PGA allows for wide array of weigh scales
  • Low power and low cost
  • Typically used in portable weigh scale applications
View Detailed Reference Design external link

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