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PDF AD7402 Data sheet ( Hoja de datos )
| Número de pieza | AD7402 | |
| Descripción | 16-Bit Isolated Sigma-Delta Modulator | |
| Fabricantes | Analog Devices | |
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Data Sheet
16-Bit, Isolated Sigma-Delta Modulator
AD7402
FEATURES
10 MHz internal clock rate
16 bits, no missing codes
Signal-to-noise ratio (SNR): 87 dB typical
Effective number of bits (ENOB): 13.5 bits typical
Typical offset drift vs. temperature: 1.7 µV/°C
On-board digital isolator
On-board reference
Full-scale analog input range: ±320 mV
−40°C to +105°C operating range
High common-mode transient immunity: >25 kV/µs
8-lead, wide-body SOIC, with increased creepage package
Slew rate limited output for low electromagnetic
interference (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 opto-isolator replacements
GENERAL DESCRIPTION
The AD74021 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 AD7402 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 10 MHz. The original
FUNCTIONAL BLOCK DIAGRAM
VDD1
VDD2
AD7402
REF BUF CLOCK
CLK
ENCODER
CLK
DECODER
MCLKOUT
(10MHz)
VIN+
VIN–
Σ-Δ ADC
DATA
ENCODER
CLK
DECODER
MDAT
GND1
Figure 1.
GND1
information can be reconstructed with an appropriate digital
filter to achieve 87 dB signal to noise ratio (SNR) at 39 kSPS. The
serial input/output can use a 3 V to 5.5 V or a 3.3 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 AD7402 device is
offered in an 8-lead, wide body SOIC package and has an
operating temperature range of −40°C to +105°C.
1 Protected by U.S. Patents 5,952,849; 6,873,065; and 7,075,329.
Rev. 0
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
©2015 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
Data Sheet
AD7402
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
105 °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 4 are shorted together, and Pin 5 to Pin 8 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
VISO
L(I01)
L(I02)
CTI
Value
5000 min
8.1 min1, 2
8.1 min1
0.034 min
>400
II
Unit Test Conditions/Comments
V 1-minute duration
mm Measured from input terminals to output
terminals, shortest distance through air
mm Measured from input terminals to output
terminals, shortest distance path along body
mm Insulation distance through insulation
V DIN IEC 112/VDE 0303 Part 1
Material Group (DIN VDE 0110, 1/89, Table I)
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.
REGULATORY INFORMATION
Table 5.
UL1
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,
810 V rms (1145 VPEAK) maximum working voltage3
Reinforced insulation per CSA 60950-1-07 and
IEC 60950-1, 405 V rms (583 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 AD7402-8 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 AD7402-8 is proof tested by applying an insulation test voltage ≥ 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 AD7402 RI-8-1 package material is rated by CSA to a CTI of >400 V and therefore
Material Group II.
Rev. 0 | Page 5 of 20
5 Page 
Data Sheet
27.0
26.5
26.0
TA = –40°C
TA = +85°C
TA = +25°C
TA = +105°C
25.5
25.0
24.5
24.0
23.5
23.0
–250
–125
0
125
VIN+ DC INPUT (mV)
250
Figure 17. IDD1 vs. VIN+ DC Input at Various Temperatures
10
9 TA = –40°C
TA = +25°C
8 TA = +105°C
7
6
5
4
3
2
1
0
3.0 3.5 4.0 4.5 5.0
VDD2 (V)
Figure 18. IDD2 vs. VDD2 at Various Temperatures
5.5
6
TA = –40°C
TA = +25°C
TA = +85°C
TA = +105°C
5
AD7402
4
–250
–125
0
VIN+ DC INPUT (mV)
125
250
Figure 19. IDD2 vs. VIN+ DC Input at Various Temperatures
30
20
10
0
–10
–20
–30
–320 –240 –160 –80
0
80 160 240 320
VIN+ DC INPUT (mV)
Figure 20. IIN+ vs. VIN+ DC Input
10.5
10.4
10.3
VDD1 = 4.5V
VDD1 = 5.0V
VDD1 = 5.5V
10.2
10.1
10
9.9
9.8
9.7
9.6
–40 –25 –10 5
20 35 50 65 80 95
TEMPERATURE (°C)
Figure 21. Clock Frequency vs. Temperature for Various Supply Voltages
Rev. 0 | Page 11 of 20
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet AD7402.PDF ] | |
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