AD7762 625 kSPS, 24-Bit, 109 dB Sigma-Delta ADC with On-Chip Buffer

Data acquisition systems Vibration analysis Instrumentation

The AD7762 is a high performance, 24-bit Σ-Δ analog-to-digital converter (ADC). It combines wide input bandwidth and high speed with the benefits of Σ-Δ conversion with a performance of 106 dB SNR at 625 kSPS, making it ideal for high speed data acquisition. Wide dynamic range combined with significantly reduced anti-aliasing requirements simplify the design process. An integrated buffer to drive the reference, a differential amplifier for signal buffering and level shifting, an overrange flag, internal gain and offset registers, and a low-pass digital FIR filter make the AD7762 a compact, highly integrated data acquisition device requiring minimal peripheral component selection. In addition, the device offers programmable decimation rates, and the digital FIR filter can be adjusted if the default characteristics are not appropriate to the application. The AD7762 is ideal for applications demanding high SNR without a complex front end signal processing design.

The differential input is sampled at up to 40 MSPS by an analog modulator. The modulator output is processed by a series of low-pass filters, the final filter having default or user-programmable coefficients. The sample rate, filter corner frequencies, and output word rate are set by a combination of the external clock frequency and the configuration registers of the AD7762.

The reference voltage supplied to the AD7762 determines the analog input range. With a 4 V reference, the analog input range is ±3.2 V differential biased around a common mode of 2 V. This common mode biasing can be achieved using the on-chip differential amplifier, further reducing the external signal conditioning requirements.

The AD7762 is available in an exposed paddle, 64-lead TQFP and is specified over the industrial temperature range from −40°C to +85°C.

Applications

Features and Benefits
  • 120 dB dynamic range at 78 kHz output data rate
  • 109 dB dynamic range at 625 kHz output data rate
  • 112 dB SNR at 78 kHz output data rate
  • 106 dB SNR at 625 kHz output data rate
  • 625 kHz maximum fully filtered output word rate
  • Programmable over-sampling rate (32x to 256x)
  • Fully differential modulator input
  • On-chip differential amplifier for signal buffering
  • Low pass FIR filter with default or user programmable coefficients
  • Over-range alert bit
  • Digital offset and gain correction registers
  • Low power and power down modes
Analog to Digital Converters
Data Sheets
Documentnote
AD7762: 625 kSPS, 24-Bit, 109 dB Sigma-Delta ADC With On-Chip Buffer Data Sheet (Rev. A)PDF 561 kB
Application Notes
Documentnote
AN-282: Fundamentals of Sampled Data SystemsPDF 2131 kB
AN-342: Analog Signal-Handling for High Speed and AccuracyPDF 468 kB
AN-280: Mixed Signal Circuit TechnologiesPDF 2101 kB
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-283: Sigma-Delta ADCs and DACsPDF 1699 kB
User Guides
Documentnote
UG-593: Evaluating the AD7760 and AD7762 Using the EVAL-CED1Z (Rev. 0)PDF 962.37 K
Order Information
Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
AD7762BSVZ Production64 lead TQFP_EP(10x10mm w/7.50 EP_B)OTH 160-40 to 85C23.4918.42Y
AD7762BSVZ-REEL Production64 lead TQFP_EP(10x10mm w/7.50 EP_B)REEL 1500-40 to 85C018.42Y
Evaluation Boards
Part NumberDescriptionPriceRoHS
EVAL-AD7760EDZEvaluation Board59Y
EVAL-AD7762EDZEvaluation Board59Y
EVAL-CED1ZEvaluation Board249Y
Reference Materials
AD7762: 625 kSPS, 24-Bit, 109 dB Sigma-Delta ADC With On-Chip Buffer Data Sheet (Rev. A) ad7762
AN-282: Fundamentals of Sampled Data Systems ad1674
AN-342: Analog Signal-Handling for High Speed and Accuracy ad1674
AN-280: Mixed Signal Circuit Technologies ad1674
AN-389: Using Sigma-Delta Converters-Part 2 ad7715
AN-388: Using Sigma-Delta Converters-Part 1 ad7715
AN-311: How to Reliably Protect CMOS Circuits Against Power Supply Overvoltaging ad1674
AN-282: 采样数据系统基本原理[中文版] (Rev. A) ad75019
AN-342: 高速、高精度处理模拟信号[中文版] (Rev. 0) ad9540
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
UG-593: Evaluating the AD7760 and AD7762 Using the EVAL-CED1Z (Rev. 0) ad7760
MS-2210:高速ADC的电源设计 ad9861