AD7730 CMOS, 24-Bit Sigma-Delta, Bridge Transducer ADC for Load Cell Applications

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.

Features and Benefits
  • 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
  • Operates with Reference Voltages of 1 V to 5 V
Analog to Digital Converters
Design Tools
Data Sheets
Documentnote
AD7730/AD7730L: Bridge Transducer ADC Data Sheet (Rev. B)PDF 497 kB
Application Notes
Documentnote
AN-202: An IC Amplifier User’s Guide to Decoupling, Grounding, and Making Things Go Right for a Change (Rev. B)PDF 76.97 K
AN-389: Using Sigma-Delta Converters-Part 2PDF 590 kB
AN-388: Using Sigma-Delta Converters-Part 1PDF 590 kB
AN-311: How to Reliably Protect CMOS Circuits Against Power Supply OvervoltagingPDF 217 kB
AN-607: Selecting a Low Bandwidth (<15 kSPS) Sigma-Delta ADC (Rev. E)PDF 222 kB
AN-615: Peak-to-Peak Resolution Versus Effective Resolution (Rev. 0)PDF 70 kB
AN-397: Electrically Induced Damage to Standard Linear Integrated Circuits:PDF 149 kB
AN-283: Sigma-Delta ADCs and DACsPDF 1699 kB
Order Information
Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
AD7730BNZ Production24 ld PDIPOTH 15-40 to 85C13.311.31Y
AD7730BR Production24 ld SOIC - WideOTH 31-40 to 85C00N
AD7730BR-REEL7 Production24 ld SOIC - WideREEL 400-40 to 85C00N
AD7730BRU Production24 ld TSSOPOTH 62-40 to 85C13.5611.53N
AD7730BRU-REEL7 Production24 ld TSSOPREEL 1000-40 to 85C00N
AD7730BRUZ Production24 ld TSSOPOTH 62-40 to 85C11.749.98Y
AD7730BRUZ-REEL Production24 ld TSSOPREEL 2500-40 to 85C09.98Y
AD7730BRUZ-REEL7 Production24 ld TSSOPREEL 1000-40 to 85C09.98Y
AD7730BRZ Production24 ld SOIC - WideOTH 31-40 to 85C11.749.98Y
AD7730BRZ-REEL Production24 ld SOIC - WideREEL 1000-40 to 85C11.749.98Y
AD7730BRZ-REEL7 Production24 ld SOIC - WideREEL 400-40 to 85C11.749.98Y
Evaluation Boards
Part NumberDescriptionPriceRoHS
EVAL-AD7730EBZEvaluation Board151.8Y
Reference Materials
AD7730/AD7730L: Bridge Transducer ADC Data Sheet (Rev. B) ad7730
AD7730/AD7730L/AD7731 Digital Filter Model ad7730
AD7730参考代码 ad7730
AN-202: An IC Amplifier User’s Guide to Decoupling, Grounding, and Making Things Go Right for a Change (Rev. B) ad7715
AN-389: Using Sigma-Delta Converters-Part 2 ad7715
AN-388: Using Sigma-Delta Converters-Part 1 ad7715
AN-397: 标准线性集成电路的电诱发损坏 (Rev. 0) ad7715
AN-615: 峰峰值分辨率与有效分辨率 (Rev. 0) ad7715
AN-607: 选择低带宽(<15kSPS)Σ-Δ型ADC (Rev. E) ad7701
AN-202: IC放大器用户指南：去耦、接地及其他一些要点 (Rev. 0) ad8021
AN-311: How to Reliably Protect CMOS Circuits Against Power Supply Overvoltaging ad1674
AN-607: Selecting a Low Bandwidth (<15 kSPS) Sigma-Delta ADC (Rev. E) ad7701
AN-615: Peak-to-Peak Resolution Versus Effective Resolution (Rev. 0) ad7715
AN-397: Electrically Induced Damage to Standard Linear Integrated Circuits: ad7715
AN-311: 如何切实有效地保护CMOS电路不受电源过压影响 (Rev. 0) adg406
AN-389: 使用Σ-Δ转换器—第二部分[中文版] (Rev. 0) ad7715
AN-388: 使用Σ-Δ转换器—第一部分[中文版] (Rev. 0) ad7715
AN-283: Σ-Δ型ADC和DAC[中文版] (Rev. 0) ad74111
AN-283: Sigma-Delta ADCs and DACs ad7715
MS-2210：高速ADC的电源设计 ad9861
Part 2: Circuit Suggestions Using Features and Functionality of New Sigma-Delta ad7715
Part 1: Circuit Suggestions Using Features and Functionality of New Sigma-Delta ad7715
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