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AD7403 Datasheet

Isolated Sigma-Delta Modulator

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Data Sheet
16-Bit, Isolated Sigma-Delta Modulator
AD7403
FEATURES
5 MHz to 20 MHz external clock input rate
16 bits, no missing codes
Signal-to-noise ratio (SNR): 88 dB typical
Effective number of bits (ENOB): 14.2 bits typical
Offset drift vs. temperature
AD7403: 1.6 µV/°C typical
AD7403-8: 2 µV/°C typical
On-board digital isolator
On-board reference
Full-scale analog input range: ±320 mV
Operating range
AD7403: −40°C to + 125°C
AD7403-8: −40°C to + 105°C
High common-mode transient immunity: >25 kV/µs
Wide-body SOIC with increased creepage package
Slew rate limited output for low EMI
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 = 1250 VPEAK
APPLICATIONS
Shunt current monitoring
AC motor controls
Power and solar inverters
Wind turbine inverters
Data acquisition systems
Analog-to-digital and optoisolator replacements
GENERAL DESCRIPTION
The AD74031 is a high performance, second-order, Σ-Δ modulator
that converts an analog input signal into a high speed, single-bit
data stream, with on-chip digital isolation based on Analog
Devices, Inc., iCoupler® technology. The device operates from a
5 V (VDD1) power supply and accepts a differential input signal
of ±250 mV (±320 mV full-scale). The differential input is ideally
suited to shunt voltage monitoring in high voltage applications
where galvanic isolation is required.
The analog input is continuously sampled by a high performance
analog modulator, and converted to a ones density digital output
stream with a data rate of up to 20 MHz. The original
1 Protected by U.S. Patents 5,952,849; 6,873,065; and 7,075,329.
Rev. B
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responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor 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.
FUNCTIONAL BLOCK DIAGRAM
VDD1
VDD2
BUF
VIN+
VIN–
REF
Σ-Δ ADC
CLK
DECODER
DATA
ENCODER
AD7403
CLK
ENCODER
MCLKIN
(5MHz
TO 20MHz)
DATA
DECODER
MDAT
GND1
Figure 1.
GND2
information can be reconstructed with an appropriate digital
filter to achieve 88 dB signal to noise ratio (SNR) at 78.1 kSPS.
The serial input/output can use a 5 V or a 3 V supply (VDD2).
The serial interface is digitally isolated. High speed complementary
metal oxide semiconductor (CMOS) technology, combined with
monolithic transformer technology, means the on-chip isolation
provides outstanding performance characteristics, superior to
alternatives such as optocoupler devices. The AD7403 device is
offered in a 16-lead, wide-body SOIC package and has an oper-
ating temperature range of −40°C to +125°C. The AD7403-8
device is offered in an 8-lead, wide-body SOIC package and has
an operating temperature range of −40°C to +105°C.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2014–2015 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com


Analog Devices Semiconductor Electronic Components Datasheet

AD7403 Datasheet

Isolated Sigma-Delta Modulator

No Preview Available !

AD7403
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
AD7403 .......................................................................................... 3
AD7403-8 ...................................................................................... 4
Timing Specifications .................................................................. 5
Package Characteristics ............................................................... 6
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 Configurations and Function Descriptions ........................... 9
Typical Performance Characteristics ........................................... 10
Terminology .................................................................................... 14
REVISION HISTORY
5/15—Rev. A to Rev. B
Added AD7403-8................................................................Universal
Added Endnote 3, Table 1 ............................................................... 4
Added Table 2; Renumbered Sequentially .................................... 4
Added Figure 4.................................................................................. 7
Added Figure 6 and Table 11........................................................... 9
Added Figure 8................................................................................ 10
Added Figure 14 and Figure 18..................................................... 11
Added Figure 20.............................................................................. 12
Added Power Supply Considerations Section, Figure 41, and
Figure 42 .......................................................................................... 21
Added Figure 47, Outline Dimensions........................................ 23
Changes to Ordering Guide .......................................................... 24
Data Sheet
Theory of Operation ...................................................................... 15
Circuit Information.................................................................... 15
Analog Input ............................................................................... 15
Differential Inputs ...................................................................... 16
Digital Output............................................................................. 16
Applications Information .............................................................. 17
Current Sensing Applications................................................... 17
Voltage Sensing Applications.................................................... 17
Input Filter................................................................................... 18
Digital Filter ................................................................................ 18
Interfacing to ADSP-CM4xx .................................................... 21
Power Supply Considerations................................................... 21
Grounding and Layout .............................................................. 21
Insulation Lifetime ..................................................................... 21
Outline Dimensions ....................................................................... 23
Ordering Guide .......................................................................... 24
11/14—Rev. 0 to Rev. A
Change to Figure 1 ............................................................................1
Changes to Regulatory Information Section and Table 5 ............5
Changes to Table 7.............................................................................7
Changes to Ordering Guide .......................................................... 20
4/14—Revision 0: Initial Version
Rev. B | Page 2 of 24


Part Number AD7403
Description Isolated Sigma-Delta Modulator
Maker Analog Devices
Total Page 24 Pages
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