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AD7405 の電気的特性と機能
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AD7405のメーカーはAnalog Devicesです、この部品の機能は「16-Bit Isolated Sigma-Delta Modulator / LVDS Interface」です。 |
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製品の詳細 ( Datasheet PDF )
| 部品番号 AD7405 |
| 部品説明 16-Bit Isolated Sigma-Delta Modulator / LVDS Interface |
| メーカ Analog Devices |
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Data Sheet
16-Bit, Isolated Sigma-Delta Modulator,
LVDS Interface
AD7405
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
Low voltage differential signaling (LVDS) interface
On-board digital isolator
On-board reference
Full-scale analog input voltage range: ±320 mV
−40°C to + 125°C operating temperature range
High common-mode transient immunity: >25 kV/µs
16-lead, wide-body SOIC_IC, with increased creepage
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
Maximum working insulation voltage (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
AD7405
BUF
VIN+
VIN–
REF
Σ-Δ ADC
CLK
DECODER
DATA
ENCODER
CLK
ENCODER
DATA
DECODER
MCLKIN+
(5MHz TO
20MHz)
MCLKIN–
MDAT+
MDAT–
GND1
Figure 1.
GND2
GENERAL DESCRIPTION
The AD74051 is a high performance, second-order, Σ-Δ modulator
that converts an analog input signal into a high speed, single-bit
LVDS data stream, with on-chip digital isolation based on
Analog Devices, Inc., iCoupler® technology. The AD7405 operates
from a 4.5 V to 5.5 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 SNR at 78.1 kSPS. The LVDS input/output can use a 3 V
to 5.5 V supply (VDD2).
The LVDS interface is digitally isolated. The LVDS interface
technology, combined with monolithic transformer technology,
means the on-chip isolation provides outstanding performance
characteristics, superior to alternatives such as optocoupler
devices. The AD7405 device is offered in a 16-lead, wide-body
SOIC_IC 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. A
Document Feedback
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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.
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One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
©2014 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 Page
AD7405
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............................................................... 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
REVISION HISTORY
11/14—Rev. 0 to Rev. A
Change to Figure 1 ........................................................................... 1
Changes to Table 7............................................................................ 7
Changes to Ordering Guide .......................................................... 20
9/14—Revision 0: Initial Version
Data Sheet
Terminology .................................................................................... 12
Theory of Operation ...................................................................... 13
Circuit Information.................................................................... 13
Analog Input ............................................................................... 13
Differential Inputs ...................................................................... 14
Low Voltage Differential Signaling (LVDS) Interface ........... 14
Applications Information .............................................................. 15
Current Sensing Applications................................................... 15
Voltage Sensing Applications.................................................... 15
Input Filter .................................................................................. 16
Digital Filter ................................................................................ 16
Grounding and Layout .............................................................. 19
Insulation Lifetime ..................................................................... 19
Outline Dimensions ....................................................................... 20
Ordering Guide .......................................................................... 20
Rev. A | Page 2 of 20
3Pages
Data Sheet
AD7405
PACKAGE CHARACTERISTICS
Table 3.
Parameter
Symbol Min Typ Max Unit Test Conditions/Comments
Resistance (Input to Output)1
RI-O 1012 Ω
Capacitance (Input to Output)1
CI-O
2.2 pF f = 1 MHz
IC Junction to Ambient Thermal Resistance θJA
45 °C/W Thermocouple located at center of package underside,
test conducted on 4-layer board with thin traces
1 The device is considered a 2-terminal device: Pin 1 to Pin 8 are shorted together, and Pin 9 to Pin 16 are shorted together.
INSULATION AND SAFETY RELATED SPECIFICATIONS
Table 4.
Parameter
Input to Output Momentary Withstand Voltage
Minimum External Air Gap (Clearance)
Minimum External Tracking (Creepage)
Minimum Internal Gap (Internal Clearance)
Tracking Resistance (Comparative Tracking Index)
Isolation Group
Symbol Value
Unit Test Conditions/Comments
VISO
5000 min V
1 minute duration
L(I01)
8.3 min1, 2 mm Measured from input terminals to output
terminals, shortest distance through air
L(I02)
8.3 min1
mm Measured from input terminals to output
terminals, shortest distance path along body
0.034 min mm Distance through insulation
CTI >400 V DIN IEC 112/VDE 0303 Part 13
II Material Group (DIN VDE 0110, 1/89, Table I)3
1 In accordance with IEC 60950-1 guidelines for the measurement of creepage and clearance distances for a pollution degree of 2 and altitudes ≤2000 meters.
2 Consideration must be given to pad layout to ensure the minimum required distance for clearance is maintained.
3 CSA CTI rating for the AD7405 is >600 V and a Material Group I isolation group.
REGULATORY INFORMATION
Table 5.
UL 1
Recognized under 1577
Component Recognition
Program1
5000 V rms Isolation Voltage
Single Protection
File E214100
CSA
Approved under CSA Component Acceptance Notice 5A
VDE2
Certified according to DIN V VDE V 0884-10
(VDE V 0884-10):2006-122
Basic insulation per CSA 60950-1-07 and IEC 60950-1,
830 V rms (1173 VPEAK) maximum working voltage3
Reinforced insulation per CSA 60950-1-07 and
IEC 60950-1, 415 V rms (586 VPEAK) maximum working
voltage3
Reinforced insulation per IEC 60601-1, 250 V rms
(353 VPEAK) maximum working voltage
File 205078
Reinforced insulation per DIN V VDE V 0884-10
(VDE V 0884-10):2006-12, 1250 VPEAK
File 2471900-4880-0001
1 In accordance with UL 1577, each AD7405 is proof tested by applying an insulation test voltage ≥ 6000 V rms for 1 second (current leakage detection limit = 15 µA).
2 In accordance with DIN V VDE V 0884-10, each AD7405 is proof tested by applying an insulation test voltage of ≥ 2344 VPEAK for 1 second (partial discharge detection limit = 5 pC).
3 Rating is calculated for a pollution degree of 2 and a Material Group III. The AD7405 RI-16-2 package material is rated by CSA to a CTI of >600 V and, therefore,
Material Group I.
Rev. A | Page 5 of 20
6 Page
合計 : 21 ページ |
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