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AD7400 Datasheet

Isolated Sigma-Delta Modulator

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Data Sheet
FEATURES
10 MHz 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: 18 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
Isolated Sigma-Delta Modulator
AD7400
GENERAL DESCRIPTION
The AD74001 is a second-order, sigma-delta (Σ-Δ) modulator
that converts an analog input signal to a high speed, 1-bit data
stream with on-chip digital isolation based on Analog Devices,
Inc. iCoupler® technology. The AD7400 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 of
10 MHz. The original information can be reconstructed with an
appropriate digital filter. The serial I/O 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 part contains an on-chip reference. The AD7400 is
offered in a 16-lead SOIC and has an operating temperature
range of −40°C to +105°C.
An external clock version, AD7401, is also available.
1 Protected by U.S. Patents 5,952,849; 6,873,065; and 7,075,329.
VIN+
VIN
T/H
BUF
REF
FUNCTIONAL BLOCK DIAGRAM
VDD1
Σ-ADC
UPDATE
AD7400
WATCHDOG
ENCODE
DECODE
CONTROL LOGIC
UPDATE
ENCODE
WATCHDOG
DECODE
VDD2
MDAT
MCLKOUT
GND1
Figure 1.
GND2
Rev. H
Document Feedback
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responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or 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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2006–2018 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com


Analog Devices Semiconductor Electronic Components Datasheet

AD7400 Datasheet

Isolated Sigma-Delta Modulator

No Preview Available !

AD7400
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
5/2018—Rev. G to Rev. H
Changes to Minimum External Air Gap (Clearance) Parameter,
Minimum External Tracking (Creepage) Parameter, Tracking
Resistance (Comparative Tracking Index) Parameter, and
Isolation Group Parameter, Table 3, and 5000 V rms Isolation
Voltage Parameter, Table 4 .............................................................. 5
Added Note 1 and Note 2, Table 3; Renumbered Sequentially .. 5
6/2013—Rev. F to Rev. G
Changes to Figure 12 and Figure 13............................................. 10
3/2012—Rev. E to Rev. F
Changed IDD1 Parameter from 12 mA to 13 mA, Table 1 ............ 3
7/2011—Rev. D to Rev. E
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
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 AD7400 Performance ...................................... 17
Insulation Lifetime ..................................................................... 17
Outline Dimensions ....................................................................... 18
Ordering Guide .......................................................................... 18
4/2011—Rev. C to Rev. D
Changes to Dynamic Input Current Parameter, Table 1 ..............3
1/2011—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
9/2007—Rev. A to Rev. B
Updated VDE Certification Throughout ......................................1
Changes to Table 6.............................................................................7
12/2006—Rev. 0 to Rev. A
Changes to Features ..........................................................................1
Changes to Table 6.............................................................................7
Changes to Analog Input Section................................................. 13
Changes to Figure 26...................................................................... 15
1/2006—Revision 0: Initial Version
Rev. H | Page 2 of 20


Part Number AD7400
Description Isolated Sigma-Delta Modulator
Maker Analog Devices
Total Page 20 Pages
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