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AD7400 Arkusz danych(PDF) 1 Page - Analog Devices

Numer części AD7400
Szczegółowy opis  Isolated Sigma-Delta Modulator
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AD7400 Arkusz danych(HTML) 1 Page - Analog Devices

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Isolated Sigma-Delta Modulator
Preliminary Technical Data
AD7400/AD7401
FEATURES
Up to 20 MHz Data Rate (AD7401)
10 MHz Data Rate (AD7400)
2nd Order Modulator
±4 LSB INL @16 Bits
Onboard Digital Isolator
Onboard Reference
Low Power Operation:
15 mA @ 5 V
-40 C to +105 C 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
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
UPDATE
ENCODE
DECODE
WATCHDOG
T/H
VDD1
Σ-∆ ADC
MCLKOUT*
CONTROL LOGIC
MDAT
GND1
VDD2
GND2
VIN+
VIN-
REF
BUF
UPDATE
ENCODE
DECODE
WATCHDOG
*MCLKIN pin on AD7401
Rev. PrH
Information furnished by Analog Devices is believed to be accurate and reliable.
However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other rights of third parties that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective companies.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703
© 2004 Analog Devices, Inc. All rights reserved.


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