AD7714 CMOS, 3V/5V, 500 µA, 24-Bit Sigma-Delta, Signal Conditioning ADC

The AD7714 is a complete analog front end for low-frequency measurement applications. The device accepts low level signals directly from a transducer and outputs a serial digital word. It employs a sigma-delta conversion technique to realize up to 24 bits of no missing codes performance. The input signal is applied to a proprietary programmable gain front end based around an analog modulator. The modulator output is processed by an on-chip digital filter. The first notch of this digital filter can be programmed via the on-chip control register allowing adjustment of the filter cutoff and settling time.

The part features three differential analog inputs (which can also be configured as five pseudo-differential analog inputs) as well as a differential reference input. The AD7714 thus performs all signal conditioning and conversion for a system consisting of up to five channels. A new Y grade has recently been added to the existing range. Compared to the A grades this new grade has an extended operating temperature range, schmitt trigger inputs on SCLK and DIN, tighter linearity specifications, lower power consumption and is available in a smaller package.

The AD7714 is ideal for use in smart microcontroller- or DSP-based systems. It features a serial interface that can be configured for three-wire operation. Gain settings, signal polarity and channel selection can be configured in software using the serial port. The AD7714 provides self-calibration, system calibration and background calibration options and also allows the user to read and write the on-chip calibration registers.

CMOS construction ensures very low power dissipation, and the power-down mode reduces the standby power consumption to 15 µW typical at 3 V. Minimum operating voltage for the A grades is 3 V and 2.7 V for the Y grades. The A grades are available in a 24-pin, 0.3 inch-wide, plastic dual-in-line package (DIP); a 24 lead small outline (SOIC) package and a 28-lead shrink small outline package (SSOP). The new Y grade is available in a 24-pin, 0.3 inch-wide, plastic dual-in-line package (DIP); a 24 lead small outline (SOIC) package and a 24-lead Thin Shrink Small Outline Package (TSSOP).

Features and Benefits
  • Charge Balancing ADC
    24 Bits No Missing Codes
    0.0015% Nonlinearity
  • Five-Channel Programmable Gain Front End
    Gains from 1 to 128
    Can Be Configured as Three Fully Differential
    Inputs or Five Pseudo-Differential Inputs
  • Three-Wire Serial Interface
    SPI®, QSPI™, MICROWIRE™ and DSP Compatible
  • 3 V (AD7714-3) or 5 V (AD7714-5) Operation
  • Low Current (350 µA typ) with Power-Down (5 µA typ)
  • Low Noise (<150 nV rms)
  • Low-Pass Filter with Programmable Filter Cutoffs
  • Please see data sheet for additional features
    • Analog to Digital Converters
    Design Tools
    Data Sheets
    Documentnote
    AD7714: CMOS, 3V/5V, 500 µA, 24-Bit Sigma-Delta, Signal Conditioning ADC Data Sheet (Rev. C)PDF 306 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
    AN-553: Adjusting the Calibration Coefficients on the AD771X Family of ADCsPDF 221 kB
    User Guides
    Documentnote
    UG-761: Evaluation Board for the AD7714-3, 24-Bit Low Power Sigma-Delta ADCPDF 568.63 K
    Frequently Asked Questions
    Documentnote
    Order Information
    Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
    AD7714ACHIPS-3 ProductionCHIPS OR DIEREEL 49-40 to 85C011.73Y
    AD7714ACHIPS-5 ProductionCHIPS OR DIEREEL 49-40 to 85C011.73Y
    AD7714AN-5 Production24 ld PDIPOTH 15-40 to 85C14.6212.43N
    AD7714ANZ-3 Last Time Buy24 ld PDIPOTH 15-40 to 85C13.311.3Y
    AD7714ANZ-5 Production24 ld PDIPOTH 15-40 to 85C12.6610.76Y
    AD7714AR-3 Last Time Buy24 ld SOIC - WideOTH 31-40 to 85C13.5511.51N
    AD7714AR-5 Production24 ld SOIC - WideOTH 31-40 to 85C12.910.96N
    AD7714AR-5REEL Production24 ld SOIC - WideREEL 1000-40 to 85C010.96N
    AD7714ARS-3 Last Time Buy28 ld SSOPOTH 47-40 to 85C13.5511.51N
    AD7714ARS-5 Production28 ld SSOPOTH 47-40 to 85C12.910.96N
    AD7714ARSZ-3 Production28 ld SSOPOTH 47-40 to 85C11.179.49Y
    AD7714ARSZ-3REEL Production28 ld SSOPREEL 1500-40 to 85C09.49Y
    AD7714ARSZ-5 Production28 ld SSOPOTH 47-40 to 85C11.179.49Y
    AD7714ARSZ-5REEL Production28 ld SSOPREEL 1500-40 to 85C09.49Y
    AD7714ARZ-3 Production24 ld SOIC - WideOTH 31-40 to 85C11.739.96Y
    AD7714ARZ-3REEL Production24 ld SOIC - WideREEL 1000-40 to 85C09.96Y
    AD7714ARZ-5 Production24 ld SOIC - WideOTH 31-40 to 85C11.179.49Y
    AD7714ARZ-5REEL Production24 ld SOIC - WideREEL 1000-40 to 85C09.49Y
    AD7714YN Last Time Buy24 ld PDIPOTH 15-40 to 105C12.8910.96N
    AD7714YNZ Production24 ld PDIPOTH 15-40 to 105C11.179.49Y
    AD7714YR Production24 ld SOIC - WideOTH 31-40 to 105C11.389.68N
    AD7714YRU Production24 ld TSSOPOTH 62-40 to 105C11.389.68N
    AD7714YRUZ Production24 ld TSSOPOTH 62-40 to 105C9.868.38Y
    AD7714YRUZ-REEL Production24 ld TSSOPREEL 2500-40 to 105C08.38Y
    AD7714YRUZ-REEL7 Production24 ld TSSOPREEL 1000-40 to 105C08.38Y
    AD7714YRZ Production24 ld SOIC - WideOTH 31-40 to 105C9.868.38Y
    AD7714YRZ-REEL Production24 ld SOIC - WideREEL 1000-40 to 105C08.38Y
    AD7714YRZ-REEL7 Production24 ld SOIC - WideREEL 400-40 to 105C08.38Y
    Evaluation Boards
    Part NumberDescriptionPriceRoHS
    EVAL-AD7714-3EBZEvaluation Board151.8Y
    Reference Materials
    AD7714: CMOS, 3V/5V, 500 µA, 24-Bit Sigma-Delta, Signal Conditioning ADC Data Sheet (Rev. C) ad7714
    AD7714 Digital Filter Model ad7714
    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
    AN-553: Adjusting the Calibration Coefficients on the AD771X Family of ADCs ad7710
    UG-761: Evaluation Board for the AD7714-3, 24-Bit Low Power Sigma-Delta ADC ad7714
    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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