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PDF AD7403 Data sheet ( Hoja de datos )
| Número de pieza | AD7403 | |
| Descripción | Isolated Sigma-Delta Modulator | |
| Fabricantes | Analog Devices | |
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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
Document Feedback
Information furnishedb yA nalogD evicesi s believedt ob eac curatean drel iable.H owever,n o
responsibilityisassumedbyAnalogDevices foritsuse,nor foranyinfringementsofpatentsor other
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
www.analog.com
http://www.Datasheet4U.com
1 page  
Data Sheet
AD7403
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 m.
2 Consideration must be given to pad layout to ensure the minimum required distance for clearance is maintained.
3 CSA CTI rating for the AD7403 is >600 V and a Material Group I isolation group.
REGULATORY INFORMATION (PENDING)
Approvals for the AD7403 by the organizations listed in Table 5 are pending.
Table 5.
UL (Pending)1
Recognized under 1577
Component Recognition
Program1
5000 V rms Isolation Voltage
Single Protection
File E214100
CSA (Pending)
Approved under CSA Component Acceptance Notice 5A
VDE (Pending)2
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 AD7403 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 AD7403 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 AD7403 RI-16-2 package material is rated by CSA to a CTI of >600 V and therefore
Material Group I.
Rev. 0 | Page 5 of 20
5 Page 
Data Sheet
32
TA = –40°C
TA = 0°C
31 TA = +25°C
TA = +85°C
TA = +125°C
30
DC INPUT
29
28
27
26
25
–250
–125
0
125 250
VIN+ DC INPUT (mV)
Figure 17. IDD1 vs. VIN+ DC Input at Various Temperatures
14
12
10
8
6
MCLKIN = 20MHz, –40°C
MCLKIN = 20MHz, +25°C
4 MCLKIN = 20MHz, +85°C
MCLKIN = 20MHz, +125°C
MCLKIN = 10MHz, –40°C
2 MCLKIN = 10MHz, +25°C
MCLKIN = 10MHz, +85°C
MCLKIN = 10MHz, +125°C
0
3.0 3.5 4.0 4.5 5.0 5.5
VDD2 (V)
Figure 18. IDD2 vs. VDD2 at Various Temperatures and Clock Rates
14
TA = –40°C
TA = 0°C
TA = +25°C
TA = +85°C
13 TA = +125°C
AD7403
DC INPUT
12
11
10
–250
–125
0
125 250
VIN+ DC INPUT (mV)
Figure 19. IDD2 vs. VIN+ DC Input at Various Temperatures
60
DC INPUT
40
20
0
MCLKIN = 5MHz
–20 MCLKIN = 10MHz
MCLKIN = 20MHz
–40
–60
–320 –240 –160 –80 0 80 160 240
VIN+ DC INPUT (mV)
Figure 20. IIN+ vs. VIN+ DC Input at Various Clock Rates
320
Rev. 0 | Page 11 of 20
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet AD7403.PDF ] | |
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