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AD7400AYNSZ

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21
Isolated Sigma-Delta Modulator
Data Sheet
AD7400A
Rev. D Document Feedback
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Technical Support www.analog.com
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
V
IORM
= 891 V peak
APPLICATIONS
AC motor controls
Shunt current monitoring
Data acquisition systems
Analog-to-digital and opto-isolator replacements
GENERAL DESCRIPTION
The AD7400A
1
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 (V
DD2
).
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.
1
Protected by U.S. Patents 5,952,849; 6,873,065; and 7,075,329.
FUNCTIONAL BLOCK DIAGRAM
V
IN
+
V
DD1
V
DD2
V
IN
–
Σ-Δ ADC
CONTROL LOGIC
AD7400A
BUF
T/H
REF
UPDATE
GND
1
GND
2
MDAT
MCLKOUT
ENCODE
ENCODE
DECODE
DECODE
WATCHDOG
WATCHDOG
UPDATE
07077-001
Figure 1.
AD7400A* PRODUCT PAGE QUICK LINKS
Last Content Update: 02/23/2017
COMPARABLE PARTS
View a parametric search of comparable parts.
EVALUATION KITS
• AD7400A Evaluation Board
DOCUMENTATION
Data Sheet
• AD7400A: Isolated Sigma-Delta Modulator Data Sheet
SOFTWARE AND SYSTEMS REQUIREMENTS
• CED1Z FPGA Project for AD7400A with Nios driver
TOOLS AND SIMULATIONS
• AD7400/AD7401 IBIS Model
REFERENCE DESIGNS
• CN0185
REFERENCE MATERIALS
Press
• Analog Devices Achieves Major Milestone by Shipping 1
Billionth Channel of iCoupler Digital Isolation
Product Selection Guide
• Digital Isolator Product Selection and Resource Guide
Technical Articles
• Inside iCoupler® Technology:ADuM347x PWM Controller
and Transformer Driver with Quad-Channel Isolators
Design Summary
• N
App
kin Note: Lowering the Power of the ADuM524x
DESIGN RESOURCES
• AD7400A Material Declaration
• PCN-PDN Information
• Quality And Reliability
• Symbols and Footprints
DISCUSSIONS
View all AD7400A EngineerZone Discussions.
SAMPLE AND BUY
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TECHNICAL SUPPORT
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number.
DOCUMENT FEEDBACK
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AD7400A Data Sheet
Rev. D | Page 2 of 20
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
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
REVISION HISTORY
11/12—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
7/11—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
1/11—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
9/08—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
5/08—Revision 0: Initial Version
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21

AD7400AYNSZ

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IC MODULATOR SIGMADELTA 8-SMD
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