AD7401 Datasheet PDF - Analog Devices

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AD7401
Analog Devices

Part Number AD7401
Description Isolated Sigma-Delta Modulator
Page 21 Pages


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Data Sheet
Isolated Sigma-Delta Modulator
AD7401
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
VIORM = 891 V peak
APPLICATIONS
AC motor controls
Data acquisition systems
A/D + opto-isolator replacements
GENERAL DESCRIPTION
The AD74011 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 (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 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
VDD1
VDD2
VIN+
VIN
T/H
Σ-ADC
BUF
REF
CONTROL LOGIC
UPDATE
ENCODE
WATCHDOG
AD7401
WATCHDOG
DECODE
UPDATE
MDAT
DECODE
ENCODE
MCLKIN
GND1
Figure 1.
GND2
Rev. E
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Tel: 781.329.4700 ©2006–2015 Analog Devices, Inc. All rights reserved.
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AD7401* Product Page Quick Links
Last Content Update: 11/01/2016
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
• NAppkin 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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AD7401
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
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
Data Sheet
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
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
Rev. E | Page 2 of 20



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Data Sheet
AD7401
SPECIFICATIONS
VDD1 = 4.5 V to 5.25 V, VDD2 = 3 V to 5.5 V, VIN+ = −200 mV to +200 mV, and VIN− = 0 V (single-ended); TA = TMIN to TMAX,
fMCLK = 16 MHz maximum, tested with Sinc3 filter, 256 decimation rate, as defined by Verilog code, unless otherwise noted.
Table 1.
Parameter
STATIC PERFORMANCE
Resolution
Integral Nonlinearity3
Differential Nonlinearity3
Y Version1, 2
16
±15
±25
±55
±0.9
Offset Error3
Offset Drift vs. Temperature
Offset Drift vs. VDD1
Gain Error3
Gain Error Drift vs. Temperature
Gain Error Drift vs. VDD1
ANALOG INPUT
Input Voltage Range
Dynamic Input Current
DC Leakage Current
Input Capacitance
DYNAMIC SPECIFICATIONS
Signal-to-(Noise + Distortion) Ratio (SINAD)3
Signal-to-Noise Ratio (SNR)
Total Harmonic Distortion (THD)3
Peak Harmonic or Spurious Noise (SFDR)3
Effective Number of Bits (ENOB)3
Isolation Transient Immunity3
LOGIC INPUTS
Input High Voltage, VIH
Input Low Voltage, VIL
Input Current, IIN
Input Capacitance, CIN5
±0.6
±50
3.5
1
120
±1.6
±2
±1
23
110
±200
±9
±0.5
10
70
68
65
65
81
80
80
−92
−92
11.5
25
30
0.8 × VDD2
0.2 × VDD2
±0.5
10
Unit Test Conditions/Comments
Bits min
LSB max
LSB max
LSB max
LSB max
mV max
µV typ
µV/°C max
µV/°C typ
µV/V typ
mV max
mV max
mV typ
µV/°C typ
µV/V typ
Filter output truncated to 16 bits
−40°C to +85°C; ±2 LSB typical; fMCLK = 20 MHz maximum4
>85°C to 105°C
fMCLK = 20 MHz maximum4; VIN+ = −250 mV to +250 mV
Guaranteed no missed codes to 16 bits;
fMCLK = 20 MHz maximum4; VIN+ = −250 mV to +250 mV
fMCLK = 20 MHz maximum4; VIN+ = −250 mV to +250 mV
TA = 25°C
−40°C to +105°C
−40°C to +85°C
>85°C to 105°C
fMCLK = 20 MHz maximum4; VIN+ = −250 mV to +250 mV
−40°C to +105°C
mV min/mV max
µA max
µA max
pF typ
dB min
dB min
dB min
dB min
dB typ
dB min
dB min
dB typ
dB typ
Bits
kV/µs min
kV/µs typ
For specified performance; full range ±320 mV
VIN+ = 400 mV, VIN− = 0 V
VIN+ = 5 kHz, 400 mV p-p sine
−40°C to +85°C; fMCLK = 9 MHz to 20 MHz4
−40°C to +85°C; fMCLK = 5 MHz to <9 MHz
>85°C to 105°C
fMCLK = 20 MHz maximum4; VIN+ = −250 mV to +250 mV
−40°C to +105°C; 82 dB typ
fMCLK = 20 MHz maximum4; VIN+ = −250 mV to +250 mV
fMCLK = 20 MHz maximum4; VIN+ = −250 mV to +250 mV
V min
V max
µA max
pF max
Rev. E | Page 3 of 20



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