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AD7401YRWZ-REEL7

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21
Isolated Sigma-Delta Modulator
Data Sheet
AD7401
Rev. E Document Feedback
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Technical Support www.analog.com
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
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
Data acquisition systems
A/D + opto-isolator replacements
GENERAL DESCRIPTION
The AD7401
1
is a second-order, sigma-delta (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. The input information is contained in the
output stream as a density of ones with a data rate up to 20 MHz.
The original information can be reconstructed with an appropriate
digital filter. The serial input/output 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 device contains an on-chip reference. The AD7401 is offered
in a 16-lead SOIC and has an operating temperature range of
−40°C to +105°C.
An internal clock version, AD7400, is also available.
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-∆ ADC
CONTROL LOGIC
AD7401
B
U
F
T
/
H
REF
W ATCHDOG
GND
1
GND
2
MDAT
MCLKIN
DECODE
ENCODE DECODE
ENCODE
UPDATE
W ATCHDOG
UPDATE
05851-001
Figure 1.
AD7401* PRODUCT PAGE QUICK LINKS
Last Content Update: 02/23/2017
COMPARABLE PARTS
View a parametric search of comparable parts.
EVALUATION KITS
• AD7401 Evaluation Board
DOCUMENTATION
Application Notes
• AN-0971: Recommendations for Control of Radiated
Emissions with isoPower Devices
• AN-1316: Generating Multiple Isolated Bias Rails for IGBT
Motor Drives with Flyback, SEPIC, and Ćuk Combination
• AN-727: iCoupler® Isolation in RS-485 Applications
• AN-740: iCoupler® Isolation in RS-232 Applications
• AN-770: iCoupler® Isolation in CAN Bus Applications
• AN-793: ESD/Latch-Up Considerations with iCoupler®
Isolation Products
• AN-825: Power Supply Considerations in iCoupler®
Isolation Products
• AN-913: Isolating I2C Interfaces
Data Sheet
• AD7401: Isolated Sigma-Delta Modulator Data Sheet
SOFTWARE AND SYSTEMS REQUIREMENTS
• CED1Z FPGA Project for AD7401/01A with Nios driver
• AD7401 and AD7401A Evaluation Software
TOOLS AND SIMULATIONS
• AD7400/AD7401 IBIS Model
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
• Eye Movement Controls Gaming Console
• 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
• Sigma-Delta Conversion Used for Motor Control
DESIGN RESOURCES
• AD7401 Material Declaration
• PCN-PDN Information
• Quality And Reliability
• Symbols and Footprints
DISCUSSIONS
View all AD7401 EngineerZone Discussions.
SAMPLE AND BUY
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TECHNICAL SUPPORT
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number.
DOCUMENT FEEDBACK
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AD7401 Data Sheet
Rev. E | 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
Digital Filter ................................................................................ 15
Applications Information .............................................................. 17
Grounding and Layout .............................................................. 17
Evaluating the AD7401 Performance ...................................... 17
Insulation Lifetime ..................................................................... 17
Outline Dimensions ....................................................................... 18
Ordering Guide .......................................................................... 18
REVISION HISTORY
12/15—Rev. D to Rev. E
Changes to Ordering Guide .......................................................... 18
7/11—Rev. C to Rev. D
Changes to Minimum External Air Gap (Clearance) Parameter,
Table 3 and Minimum External Tracking (Creepage) Parameter,
Table 3 ................................................................................................ 5
Changes to Figure 5; Pin 1 Description, Table 8; and Pin 7
Description, Table 8 .......................................................................... 8
1/11—Rev. B to Rev. C
Changes to Features Section............................................................ 1
Changes to Input-to-Output Momentary Withstand Voltage
Parameter, Table 3, UL Column, Table 4, and Note 1, Table 4 .......... 5
Changes to Ordering Guide ..................................................................... 18
9/07—Rev. A to Rev. B
Updated VDE Certification Throughout ...................................... 1
Changes to Table 6 ............................................................................. 7
12/06—Rev. 0 to Rev. A
Changes to Features and General Description .............................. 1
Changes to Table 1 ............................................................................. 3
Changes to Table 2 ............................................................................. 4
Changes to Table 6 ............................................................................. 7
Changes to Table 8 ............................................................................. 8
Changes to Circuit Information Section ..................................... 13
Changes to Figure 27 ...................................................................... 15
1/06—Revision 0: Initial Version
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21

AD7401YRWZ-REEL7

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Analog to Digital Converters - ADC Isolated Modulator
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