AD7738 8-Channel, 8.5 kHz, 24-Bit Sigma-Delta A/D Converter

The AD7738 is a high precision, high throughput analog front end. True 16-bit peak-to-peak resolution is achievable with a total conversion time of 117 µs (8.5 kHz channel switching) making it ideally suitable for high resolution multiplexing applications.

The AD7738 is based on a sigma-delta architecture and features up to 24 bits of no missing codes performance. The part can be configured via a simple digital interface, which allows users to balance the noise performance against data throughput up to a 15.4 kHz conversion rate. The analog front end features 8 single-ended or 4 fully differential input channels with unipolar or bipolar 625 mV, 1.25 V and 2.5V input ranges and accepts a common mode input voltage from 200 mV above AGND to AVDD-300 mV. The multiplexer output is pinned out externally allowing the user to implement programmable gain or signal conditioning before applying the input signal to the ADC. The differential reference input features “No Reference” detect capability. The ADC also supports per channel system calibration options.

The digital serial interface can be configured for three-wire operation and is compatible with microcontrollers and digital signal processors. All interface inputs are Schmitt triggered.

The part is specified for operation over the extended industrial temperature range of -40ºC to +105ºC and is available in 28-lead TSSOP package.

Features and Benefits
  • High resolution ADC
    - 24 bits no missing codes
    - ±0.0015% Nonlinearity
  • Optimized for Fast Channel Switching
    - 18-Bits p-p Resolution (21 Bits Effective) at 500 Hz
    - 16-Bits p-p Resolution (19 Bits Effective) at 8.5 kHz
    - 15-Bits p-p Resolution (18 Bits Effective) at 15 kHz
    - On-Chip Per Channel System Calibration
  • Configurable Inputs
    - 8 Single-Ended or 4 Fully Differential
  • Input Ranges
    - +625 mV, +1.25 V, +2.5 V, ±625 mV, ±1.25 V, ±2.5 V
  • 3-Wire Serial Interface
    - SPI®, QSPI™, MICROWIRE™ and DSP Compatible
    - Schmitt Trigger on Logic Inputs
  • Single-Supply Operation
    - 5 V Analog Supply
    - 3 V or 5 V Digital Supply
  • Package: 28-Lead TSSOP
    • Analog to Digital Converters
    Software & Systems Requirements
    Data Sheets
    Documentnote
    AD7738: 8-Channel, High Throughput, 24-Bit Sigma-Delta A/D Converter Data Sheet (Rev. 0)PDF 407 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-663: AD7732/AD7734/AD7738/AD7739 Calibration Registers (Rev. 0)PDF 96 kB
    AN-664: AD7732/AD7734/AD7738/AD7739 in Low Power Applications (Rev. 0)PDF 131 kB
    AN-626: Using the AD7732/AD7734/AD7738/AD7739 Checksum Register (Rev. 0)PDF 106 kB
    Order Information
    Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
    AD7738BRU Production28 ld TSSOP (4.4mm)OTH 50-40 to 105C10.689.08N
    AD7738BRUZ Production28 ld TSSOP (4.4mm)OTH 50-40 to 105C9.257.86Y
    AD7738BRUZ-REEL7 Production28 ld TSSOP (4.4mm)REEL 1000-40 to 105C07.86Y
    Evaluation Boards
    Part NumberDescriptionPriceRoHS
    EVAL-AD7738EBZEvaluation Board59Y
    Reference Materials
    AD7738: 8-Channel, High Throughput, 24-Bit Sigma-Delta A/D Converter Data Sheet (Rev. 0) ad7738
    AD7732/4/8/9 Evaluation Software ad7738
    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-664: AD7732/AD7734/AD7738/AD7739的低功耗应用 (Rev. 0) ad7738
    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-663: AD7732/AD7734/AD7738/AD7739 Calibration Registers (Rev. 0) ad7738
    AN-626: Using the AD7732/AD7734/AD7738/AD7739 Checksum Register (Rev. 0) ad7738
    AN-664: AD7732/AD7734/AD7738/AD7739 in Low Power Applications (Rev. 0) ad7738
    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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