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AD7401A Datasheet

Isolated Sigma-Delta Modulator

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Data Sheet
Isolated Sigma-Delta Modulator
AD7401A
FEATURES
20 MHz maximum external clock rate
Second-order modulator
16 bits, no missing codes
±2 LSB INL typical at 16 bits
1 µV/°C typical offset drift
On-board digital isolator
On-board reference
±250 mV analog input range
Low power operation: 17 mA typical at 5.5 V
−40°C to +125°C operating range
16-lead SOIC package
Internal clock version: AD7400A
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
Qualified for Automotive Applications
GENERAL DESCRIPTION
The AD7401A1 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 the Analog
Devices, Inc., iCoupler® technology. The AD7401A operates
from a 5 V power supply and accepts a pseudo-differential input
signal of ±250 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 of up to 20 MHz. The original information
can be reconstructed with an appropriate digital filter. The
serial I/O can use a 5 V or a 3.3 V supply (VDD2).
The serial interface is digitally isolated. High speed CMOS,
combined with Analog Devices, Inc., iCoupler® 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
AD7401A is offered in a 16-lead SOIC and has an operating
temperature range of −40°C to +125°C.
APPLICATIONS
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-Δ ADC
BUF
REF
CONTROL LOGIC
UPDATE
ENCODE
WATCHDOG
AD7401A
WATCHDOG
DECODE
UPDATE
MDAT
DECODE
ENCODE
MCLKIN
GND1
Figure 1.
1 Protected by U.S. Patents 5,952,849; 6,873,065; and 7,075,329. Other patents pending.
GND2
Rev. D
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rights of third parties that may result from its use. Specifications subject to change without notice. No
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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
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Analog Devices Semiconductor Electronic Components Datasheet

AD7401A Datasheet

Isolated Sigma-Delta Modulator

No Preview Available !

AD7401A
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Timing Specifications .................................................................. 5
Insulation and Safety-Related Specifications............................ 6
Regulatory Information............................................................... 6
DIN V VDE V 0884-10 (VDE V 0884-10):2006-12 Insulation
Characteristics .............................................................................. 7
Absolute Maximum Ratings............................................................ 8
ESD Caution.................................................................................. 8
Pin Configuration and Function Descriptions............................. 9
Typical Performance Characteristics ........................................... 10
Terminology .................................................................................... 13
REVISION HISTORY
1/2018—Rev. C to Rev. D
Changes to Features and General Description ............................. 1
Change to Power Dissipation Parameter, Table 1......................... 4
Changes to Table 3 and Table 4....................................................... 6
Changes to Absolute Maximum Rating Section........................... 8
Changes to Table 8............................................................................ 9
Changes to Terminology Section.................................................. 13
Changes to Ordering Guide .......................................................... 19
Added Automotive Product Section ............................................ 19
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 ................................................................................................ 6
Changes to Figure 5; Pin 1 Description, Table 8; and Pin 7
Description, Table 8.......................................................................... 9
3/2011—Rev. A to Rev. B
Change to General Description Section ........................................ 1
Changes to Table 1............................................................................ 3
Data Sheet
Theory of Operation ...................................................................... 14
Circuit Information.................................................................... 14
Analog Input ............................................................................... 14
Differential Inputs ...................................................................... 15
Current Sensing Applications................................................... 15
Voltage Sensing Applications.................................................... 15
Digital Filter ................................................................................ 16
Applications Information .............................................................. 18
Grounding and Layout .............................................................. 18
Evaluating the AD7401A Performance ................................... 18
Insulation Lifetime ..................................................................... 18
Outline Dimensions ....................................................................... 19
Ordering Guide .......................................................................... 19
Automotive Product................................................................... 19
1/2011—Rev. 0 to Rev. A
Change to Features, UL Recognition Value ...................................1
Change to Table 3, Input-to-Output Momentary Withstand
Voltage Value..................................................................................................6
Changes to Table 4, Isolation Voltage Value, and Endnote 1.......6
7/2008—Revision 0: Initial Version
Rev. D | Page 2 of 20


Part Number AD7401A
Description Isolated Sigma-Delta Modulator
Maker Analog Devices
Total Page 20 Pages
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