AD7401A

隔离式Σ-Δ调制器 Isolated Sigma-Delta Modulator

GENERAL DESCRIPTION

The 1 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 AD7401A operates from a 5 V power supply and accepts a differential input signal of ±250 mV ±320 mV full scale. The analog input is continuously sampled by the analog modulator, eliminating the need for external sample-and-hold circuitry.

FEATURES

20 MHz maximum external clock rate

Second-order modulator

16 bits, no missing codes

±2 LSB INL typical at 16 bits

1 μV/°C typical offset drift

On-board digital isolator

On-board reference

±250 mV analog input range

Low power operation: 17 mA typical at 5.5 V

−40°C to +125°C operating range

16-lead SOIC package

Internal clock version: AD7400A

Safety and regulatory approvals

  UL recognition

      3750 V rms for 1 minute per UL 1577

   CSA Component Acceptance Notice #5A

   VDE Certificate of Conformity

      DIN V VDE V 0884-10 VDE V 0884-10:2006-12

     VIORM= 891 V peak

APPLICATIONS

AC motor controls

Shunt current monitoring

Data acquisition systems

Analog-to-digital and opto-isolator replacements