AD7400 Datasheet, PDF (1/10 Pages) Analog Devices – Isolated Sigma-Delta Modulator

Preliminary Technical Data
FEATURES
Up to 20 MHz Data Rate (AD7401)
10 MHz Data Rate (AD7400)
2^nd Order Modulator
±4 LSB INL @16 Bits
Onboard Digital Isolator
Onboard Reference
Low Power Operation:
15 mA @ 5 V
-40ЊC to +105ЊC Operating Range
16-ld SOIC Package
Safety and Regulatory Approvals
UL Recognition
3750 VRMS 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 = 840VPEAK
Isolated Sigma-Delta Modulator
AD7400/AD7401
APPLICATIONS
AC Motor Control
Data Acquisition Systems
A/D + Opto-Isolator Replacement
GENERAL DESCRIPTION
The AD7400/AD7401 are 2nd order sigma-delta modulators
that convert an analog input signal into a high speed 1-bit data
stream with onboard digital isolation based on Analog Devices’
iCoupler® technology. The AD7400/AD7401 operate from a 5 V
power supply and accept a differential input signal of ±200 mV.
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 data rates up to 20MHz. The
original information can be reconstructed with an appropriate
digital filter. The serial I/O may use a 5V or 3V supply (VDD2).
The serial interface is digitally isolated. High-speed CMOS,
FUNCTIONAL BLOCK DIAGRAM
VDD1
VDD2
VIN+
T/H
VIN-
Σ-∆ ADC
BUF
REF
CONTROL LOGIC
UPDATE
ENCODE
UPDATE
ENCODE
WATCHDOG
DECODE
WATCHDOG
DECODE
MDAT
MCLKOUT*
*MCLKIN pin on AD7401
GND1
GND2
Rev. PrH
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