AD7732 2-Channel, ±10 V Input Range, High Throughput, 24-Bit Sigma-Delta ADC

The AD7732 is a high precision, high throughput analog front end. True 16-bit peak-to-peak resolution is achievable with total conversion times of 500 µs (2 kHz channel switching) making it ideally suitable for high resolution multiplexing applications. The part is specified for operation over the extended industrial temperature range of –40ºC to +105ºC and is available in 28-lead TSSOP package.

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.

The analog front end features two fully differential input channels with unipolar or true bipolar input ranges to ±10 V while operating from a single +5 V analog supply. The part has an overrange and underrange detection capability and accepts an analog input overvoltage to ±16.5 V without degrading the performance of the adjacent channels.

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 3-wire operation and is compatible with microcontrollers and digital signal processors. All interface inputs are Schmitt triggered.

Other parts in the AD7732 family are the AD7734 and the AD7738.

The AD7734 is similar to AD7732, but its analog front end features four single-ended input channels.

The AD7738 analog front end is configurable for four fully differential or eight single-ended input channels, features 0.625 V to 2.5 V bipolar/unipolar input ranges, and accepts a common-mode input voltage from 200 mV to AVDD – 300 mV. The AD7738 multiplexer output is pinned out externally, allowing the user to implement programmable gain or signal conditioning before being applied to the ADC.

Applications
  • PLCs/DCS
  • Multiplexing applications
  • Process control
  • Industrial instrumentation

Features and Benefits
  • High resolution ADC
    - 24 bits no missing codes
    - ±0.0015% nonlinearity
  • 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
  • Optimized for fast channel switching
    - 18-bit p-p resolution (21 bits effective) at 500 Hz
    - 16-bit p-p resolution (19 bits effective) at 2 kHz
    - 14-bit p-p resolution (18 bits effective) at 15 kHz
    - On-chip per channel system calibration
  • 2 fully differential analog inputs
    - Input ranges +5 V, ±5 V, +10 V, ±10 V
    - Overvoltage tolerant
    - Up to ±16.5 V not affecting adjacent channel
    - Up to ±50 V absolute maximum
Analog to Digital Converters
Software & Systems Requirements
Data Sheets
Documentnote
AD7732: 2-Channel, ±10 V Input Range, High Throughput, 24-Bit Sigma-Delta ADC Data Sheet (Rev. A)PDF 1576 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
AD7732BRU Production28 ld TSSOP (4.4mm)OTH 50-40 to 105C00N
AD7732BRUZ Production28 ld TSSOP (4.4mm)OTH 50-40 to 105C10.128.6Y
AD7732BRUZ-REEL Production28 ld TSSOP (4.4mm)REEL 2500-40 to 105C08.6Y
AD7732BRUZ-REEL7 Production28 ld TSSOP (4.4mm)REEL 1000-40 to 105C08.6Y
Evaluation Boards
Part NumberDescriptionPriceRoHS
EVAL-AD7732EBZEvaluation Board59Y
Reference Materials
AD7732: 2-Channel, ±10 V Input Range, High Throughput, 24-Bit Sigma-Delta ADC Data Sheet (Rev. A) ad7732
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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