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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
Typical offset drift vs. temperature: 1.6 µV/°C typical
On-board digital isolator
On-board reference
Full-scale analog input range: ±320 mV
−40°C to + 125°C operating range
High common-mode transient immunity: >25 kV/µs
16-lead, wide-body SOIC, with increased creepage package
Slew rate limited output for low electromagnetic
interference (EMI)
Safety and regulatory approvals (pending)
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 opto-isolator replacements
FUNCTIONAL BLOCK DIAGRAM
VDD1
VDD2
BUF
VIN+
VIN–
REF
Σ-Δ ADC
AD7403
CLK
DECODER
DATA
ENCODER
CLK
ENCODER
MCLKIN
(5MHz
TO 20MHz)
CLK
DECODER
MDAT
GND1
Figure 1.
GND2
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 AD7403 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
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
operating temperature range of −40°C to +125°C.
1 Protected by U.S. Patents 5,952,849; 6,873,065; and 7,075,329.
Rev. 0
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rightsofthirdpartiesthatmayresultfrom its use.Specificationssubject tochangewithout notice.No
license is grantedby implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registeredtrademarks are ht e propertyof their respective owners.
One T echnology W ay, P .O. Box 91 06, Norwood, M A 02 062-9106, U .S.A.
Tel: 781.329.4700
©2014 Analog Devices, Inc. All rights reserved.
Technical Support
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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
Timing Specifications .................................................................. 4
Package Characteristics ............................................................... 5
Insulation and Safety Related Specifications ............................ 5
Regulatory Information (Pending) ............................................ 5
DIN V VDE V 0884-10 (VDE V 0884-10):2006-12 Insulation
Characteristics .............................................................................. 6
Absolute Maximum Ratings............................................................ 7
ESD Caution.................................................................................. 7
Pin Configuration and Function Descriptions............................. 8
Typical Performance Characteristics ............................................. 9
Terminology .................................................................................... 12
REVISION HISTORY
4/14—Revision 0: Initial Version
Data Sheet
Theory of Operation ...................................................................... 13
Circuit Information.................................................................... 13
Analog Input ............................................................................... 13
Differential Inputs ...................................................................... 14
Digital Output............................................................................. 14
Applications Information .............................................................. 15
Current Sensing Applications................................................... 15
Voltage Sensing Applications.................................................... 15
Input Filter .................................................................................. 16
Digital Filter ................................................................................ 16
Interfacing to ADSP-CM40xF.................................................. 19
Grounding and Layout .............................................................. 19
Insulation Lifetime ..................................................................... 19
Outline Dimensions ....................................................................... 20
Ordering Guide .......................................................................... 20
Rev. 0 | Page 2 of 20


Part Number AD7403
Description Isolated Sigma-Delta Modulator
Maker Analog Devices
Total Page 20 Pages
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