AD7730

PRODUCTION

CMOS, 24-Bit Sigma-Delta, Bridge Transducer ADC for Load Cell Applications

Data Sheet (Rev. B) Product Selection Table
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Overview

  • Resolution of 230,000 Counts (Peak-to-Peak)
  • Offset Drift: 5 nV/°C
  • Gain Drift: 2 ppm/°C
  • Line Frequency Rejection: >150 dB
  • Buffered Differential Inputs
  • Programmable Filter Cutoffs
  • Specified for Drift Over Time
  • See datasheet for additional features

The AD7730 is a complete analog front end for weigh-scale and pressure measurement applications. The device accepts low-level signals directly from a transducer and outputs a serial digital word. The input signal is applied to a proprietary programmable gain front end based around an analog modulator.

The modulator output is processed by a low pass programmable digital filter, allowing adjustment of filter cutoff, output rate and settling time.

The part features two buffered differential programmable gain analog inputs as well as a differential reference input. The part operates from a single +5 V supply. It accepts four unipolar analog input ranges: 0 mV to ±10 mV, +20 mV, +40 mV and +80 mV and four bipolar ranges: ±10 mV, ±20 mV, ±40 mV and ±80 mV. The peak-to-peak resolution achievable directly from the part is 1 in 230,000 counts. An on-chip 6-bit DAC allows the removal of TARE voltages. Clock signals for synchronizing ac excitation of the bridge are also provided.

The serial interface on the part can be configured for three-wire operation and is compatible with microcontrollers and digital signal processors. The AD7730 contains self-calibration and system calibration options, and features an offset drift of less than 5 nV/°C and a gain drift of less than 2 ppm/°C.

The part is available in a 24-pin plastic DIP, a 24-lead SOIC and 24-lead TSSOP package.

APPLICATIONS

  • Weigh Scales
  • Pressure Measurement
AD7730
CMOS, 24-Bit Sigma-Delta, Bridge Transducer ADC for Load Cell Applications
AD7730 Functional Block Diagram AD7730 Pin Configuration
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Documentation

Data Sheet 1

Application Note 8

Technical Articles 4

Evaluation Design File 1

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Software Resources

AD7730/L Code Examples 2

Hardware Ecosystem

Parts Product Life Cycle Description
Voltage References 2
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Tools & Simulations

Design Tool 1

Sigma-Delta ADC Tutorial

An interactive illustration showing the behavior of an idealized sigma-delta A/D converter.

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Evaluation Kits

EVAL-AD7730

AD7730 Evaluation Kit

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Product Details

The EVAL-AD7730EBZ is a fully featured evaluation Board for the AD7730. The evaluation board can be connected to a PC via the parallel port. Software is provided enabling the user to perform detailed analysis of the ADC's performance.

EVAL-AD7730
AD7730 Evaluation Kit

Latest Discussions

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NOT getting any response from AD7730
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AD7730 Data Ready pin sometimes not going low
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