AD7401 Isolated Sigma-Delta Modulator

AC motor controls Data acquisition systems A/D + opto-isolator replacements

The AD7401 is a second-order, sigma-delta (Σ-Δ) modulator that converts an analog input signal into a high speed, 1-bit data stream with on-chip digital isolation based on Analog Devices, Inc.,  iCoupler® technology. The AD7401 operates from a 5 V power supply and accepts a differential input signal of ±200 mV (±320 mV full scale). The analog input is continuously sampled by the analog modulator, eliminating the need for external sample-and-hold circuitry. The input information is contained in the output stream as a density of ones with a data rate up to 20 MHz. The original information can be reconstructed with an appropriate digital filter. The serial input/output can use a 5 V or a 3 V supply (VDD2).

The serial interface is digitally isolated. High speed CMOS, combined with monolithic air core transformer technology, means the on-chip isolation provides outstanding performance characteristics, superior to alternatives such as optocoupler devices. The device contains an on-chip reference. The AD7401 is offered in a 16-lead SOIC and has an operating temperature range of −40°C to +105°C.

An internal clock version, AD7400, is also available.

Applications

Features and Benefits
  • 20 MHz maximum external clock rate
  • Second-order modulator
  • 16 bits no missing codes
  • ±2 LSB INL typical at 16 bits
  • 3.5 μV/°C maximum offset drift
  • On-board digital isolator
  • On-board reference
  • Low power operation: 20 mA maximum at 5.25 V
  • −40°C to +105°C operating range
  • 16-lead SOIC package
  • Safety and regulatory approvals
  • See Data Sheet for Addtional Features
Analog to Digital Converters
Interface & Isolation
Aerospace and Defense
  • Solutions
IBIS Models
Software & Systems Requirements
Data Sheets
Documentnote
AD7401: Isolated Sigma-Delta Modulator Data Sheet (Rev. E)PDF 572 kB
Application Notes
Documentnote
AN-1316: Generating Multiple Isolated Bias Rails for IGBT Motor Drives with Flyback, SEPIC, and Ćuk Combination (Rev. 0)PDF 522.41 K
AN-0971: Recommendations for Control of Radiated Emissions with isoPower Devices (Rev. C)PDF 406 kB
AN-913: Isolating I2C Interfaces (Rev. 0)PDF 280 kB
AN-727: iCoupler® Isolation in RS-485 Applications (Rev. 0)PDF 282 kB
AN-740: iCoupler® Isolation in RS-232 Applications (Rev. 0)PDF 716 kB
AN-770: iCoupler® Isolation in CAN Bus Applications (Rev. 0)PDF 234 kB
AN-793: ESD/Latch-Up Considerations with iCoupler® Isolation Products (Rev. A)PDF 246 kB
AN-825: Power Supply Considerations in iCoupler® Isolation Products (Rev. 0)PDF 181 kB
Frequently Asked Questions
Documentnote
Order Information
Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
AD7401YRWZ Production16 ld SOIC - WideOTH 47-40 to 105C3.843.25Y
AD7401YRWZ-REEL Production16 ld SOIC - WideREEL 1000-40 to 105C03.25Y
AD7401YRWZ-REEL7 Production16 ld SOIC - WideREEL 400-40 to 105C03.25Y
Evaluation Boards
Part NumberDescriptionPriceRoHS
EVAL-AD7401EDZEvaluation Board59Y
EVAL-CED1ZEvaluation Board249Y
Reference Materials
AD7401: Isolated Sigma-Delta Modulator Data Sheet (Rev. E) ad7401
AD7400/AD7401 IBIS Model ad7400
AD7401 评估软件(zip) ad7401
AN-1316: 利用反激、 SEPIC 和 Ćuk 组合为 IGBT 电机驱动产生多个隔离偏置轨 (Rev. 0) adp1621
AN-1316: Generating Multiple Isolated Bias Rails for IGBT Motor Drives with Flyback, SEPIC, and Ćuk Combination (Rev. 0) ad7403
AN-0971: isoPower器件的辐射控制建议 (Rev. C) adum1233
AN-0971: Recommendations for Control of Radiated Emissions with isoPower Devices (Rev. C) ad7400
AN-793: iCoupler®隔离产品的ESD/闩锁考虑因素 (Rev. A) adum1233
AN-770: CAN总线应用中的iCoupler®隔离 (Rev. 0) adum1233
AN-740: RS-232应用中的Coupler® 隔离 (Rev. 0) adum1233
AN-727: RS-485应用中的iCoupler®隔离 (Rev. 0) adum1233
AN-913: I²C 接口的隔离 (Rev. 0) adum1233
AN-913: Isolating I2C Interfaces (Rev. 0) ad7400
AN-727: iCoupler® Isolation in RS-485 Applications (Rev. 0) ad7400
AN-740: iCoupler® Isolation in RS-232 Applications (Rev. 0) ad7400
AN-770: iCoupler® Isolation in CAN Bus Applications (Rev. 0) ad7400
AN-793: ESD/Latch-Up Considerations with iCoupler® Isolation Products (Rev. A) ad7400
AN-825: iCoupler®隔离产品的电源考虑因素 (Rev. 0) adum1233
AN-825: Power Supply Considerations in iCoupler® Isolation Products (Rev. 0) ad7400
数字隔离器产品选型与资源指南 adum1233
Σ-Δ 转换用于电机控制 adsp-cm402f
Inside iCoupler® Technology:ADuM347x PWM Controller and Transformer Driver with ad7400
NAppkin Note: Lowering the Power of the ADuM524x ad7400
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