GENERAL DESCRIPTION
The AD7401¹ is a second-order, 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.

FEATURES
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
AD7400, internal clock version
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 EN 60747-5-2 (VDE 0884 Part 2): 2003-01
   DIN EN 60950 (VDE 0805): 2001-12; EN 60950: 2000
   VIORM= 891 V peak

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