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AD7400A Datasheet

Isolated Sigma-Delta Modulator

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Data Sheet
Isolated Sigma-Delta Modulator
AD7400A
FEATURES
10 MHz clock rate
Second-order modulator
16 bits, no missing codes
±2 LSB INL typical at 16 bits
1.5 μV/°C typical offset drift
On-board digital isolator
On-board reference
±250 mV analog input range
Low power operation: 15.5 mA typical at 5.5 V
−40°C to +125°C operating range
16-lead SOIC package
AD7401A, external clock version in 16-lead SOIC
Safety and regulatory approvals
UL recognition
5000 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
GENERAL DESCRIPTION
The AD7400A1 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 AD7400A operates from a 5 V power supply
and accepts a differential input signal of ±250 mV (±320 mV
full-scale). The analog input is sampled continuously 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 of 10 MHz.
The original information can be reconstructed with an appropriate
digital filter. The serial I/O 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 part contains an on-chip reference and has an
operating temperature range of −40°C to +125°C. The AD7400A
is offered in a 16-lead SOIC package.
APPLICATIONS
1 Protected by U.S. Patents 5,952,849; 6,873,065; and 7,075,329.
AC motor controls
Shunt current monitoring
Data acquisition systems
Analog-to-digital and opto-isolator replacements
FUNCTIONAL BLOCK DIAGRAM
VDD1
VDD2
VIN+
VIN
T/H
Σ-ADC
BUF
REF
CONTROL LOGIC
UPDATE
ENCODE
UPDATE
AD7400A
WATCHDOG
DECODE
WATCHDOG
MDAT
ENCODE
DECODE
MCLKOUT
GND1
Figure 1.
GND2
Rev. E
Document Feedback
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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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2008–2018 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com


Analog Devices Semiconductor Electronic Components Datasheet

AD7400A Datasheet

Isolated Sigma-Delta Modulator

No Preview Available !

AD7400A
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Timing Specifications .................................................................. 4
Insulation and Safety-Related Specifications............................ 5
Regulatory Information............................................................... 5
DIN V VDE V 0884-10 (VDE V 0884-10) Insulation
Characteristics .............................................................................. 6
Absolute Maximum Ratings............................................................ 7
ESD Caution.................................................................................. 7
Pin Configuration and Function Descriptions............................. 8
Typical Performance Characteristics ............................................. 9
REVISION HISTORY
4/2018—Rev. D to Rev. E
Changes to Table 3 and Table 4....................................................... 5
11/2012—Rev. C to Rev. D
Deleted 8-Lead PDIP .........................................................Universal
Change to Note 1 .............................................................................. 1
Deleted Figure 5 and Renumbered Sequentially .......................... 8
Updated Outline Dimensions ....................................................... 18
Changes to Ordering Guide .......................................................... 18
7/2011—Rev. B to Rev. C
Changes to Minimum External Air Gap (Clearance) Parameter,
Table 3 and Minimum External Tracking (Creepage) Parameter,
Table 3 ................................................................................................ 5
Changes to Figure 6; Pin 1 Description, Table 8; and Pin 7
Description, Table 8.......................................................................... 8
1/2011—Rev. A to Rev. B
Changed UL Recognition from 3750 V rms to 5000 V rms ....... 1
Changes to Input-to-Output Momentary Withstand Voltage
Value (Table 3) .................................................................................. 5
Changed UL Recognition from 3750 V rms to 5000 V rms
(Table 4) ............................................................................................. 5
Changes to Note 1 (Table 4) ............................................................ 5
Data Sheet
Terminology .................................................................................... 12
Theory of Operation ...................................................................... 13
Circuit Information.................................................................... 13
Analog Input ............................................................................... 13
Differential Inputs ...................................................................... 14
Current Sensing Applications................................................... 14
Voltage Sensing Applications.................................................... 14
Digital Filter ................................................................................ 15
Applications Information .............................................................. 17
Grounding and Layout .............................................................. 17
Evaluating the AD7400A Performance ................................... 17
Insulation Lifetime ..................................................................... 17
Outline Dimensions ....................................................................... 18
Ordering Guide .......................................................................... 18
9/2008—Rev. 0 to Rev. A
Added 16-Lead SOIC.........................................................Universal
Changes to General Description Section .......................................1
Changes to Table 1, Test Conditions/Comments Column ..........3
Changes to Timing Specifications Table Summary ......................4
Changes to Table 4, Note 2 ...............................................................5
Added Figure 6; Renumbered Sequentially ...................................8
Changes to Terminology Section ................................................. 12
Updated Outline Dimensions....................................................... 18
Changes to Ordering Guide .......................................................... 18
5/2008—Revision 0: Initial Version
Rev. E | Page 2 of 18


Part Number AD7400A
Description Isolated Sigma-Delta Modulator
Maker Analog Devices
Total Page 18 Pages
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