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AD7400 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer AD7400
Beschreibung Isolated Sigma-Delta Modulator
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 10 Seiten
AD7400 Datasheet, Funktion
Preliminary Technical Data
FEATURES
Up to 20 MHz Data Rate (AD7401)
10 MHz Data Rate (AD7400)
2nd Order Modulator
±4 LSB INL @16 Bits
Onboard Digital Isolator
Onboard Reference
Low Power Operation:
15 mA @ 5 V
-40ЊC to +105ЊC Operating Range
16-ld SOIC Package
Safety and Regulatory Approvals
UL Recognition
3750 VRMS for 1 minute per UL 1577
CSA Component Acceptance Notice ~5A
VDE Certificate of Conformity
DIN EN 60747-5-2 (VDE 0884 Part 2):2003-01
DIN EN 60950 (VDE 0805): 2001-12; EN 60950:2000
VIORM = 840VPEAK
Isolated Sigma-Delta Modulator
AD7400/AD7401
APPLICATIONS
AC Motor Control
Data Acquisition Systems
A/D + Opto-Isolator Replacement
GENERAL DESCRIPTION
The AD7400/AD7401 are 2nd order sigma-delta modulators
that convert an analog input signal into a high speed 1-bit data
stream with onboard digital isolation based on Analog Devices’
iCoupler® technology. The AD7400/AD7401 operate from a 5 V
power supply and accept a differential input signal of ±200 mV.
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 data rates up to 20MHz. The
original information can be reconstructed with an appropriate
digital filter. The serial I/O may use a 5V or 3V supply (VDD2).
The serial interface is digitally isolated. High-speed CMOS,
FUNCTIONAL BLOCK DIAGRAM
VDD1
VDD2
VIN+
VIN-
T/H
Σ-ADC
BUF
REF
CONTROL LOGIC
UPDATE
ENCODE
UPDATE
ENCODE
WATCHDOG
DECODE
WATCHDOG
DECODE
MDAT
MCLKOUT*
*MCLKIN pin on AD7401
GND1
GND2
Rev. PrH
Information furnished by Analog Devices is believed to be accurate and reliable.
However, no 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. Trademarks and
registered trademarks are the property of their respective companies.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved.






AD7400 Datasheet, Funktion
AD7400/AD7401
Preliminary Technical Data
ABSOLUTE MAXIMUM RATINGS1,3
Table 4. AD7400/AD7401 Absolute Maximum Ratings (TA = +25°C unless otherwise noted)
VDD1 to GND1
VDD2 to GND2
Analog Input Voltage to GND1
Digital Input Voltage to GND2
Output Voltage to GND2
Input Current to Any Pin Except Supplies2
Operating Temperature Range
Storage Temperature Range
Junction Temperature
SOIC Package
θJA Thermal Impedance
θJC Thermal Impedance
Resistance (Input-Output), RI-O
-0.3 V to +6.5V
-0.3 V to +6.5 V
-0.3 V to VDD1 +0.3V
-0.3 V to VDD2 +0.5 V
-0.3 V to VDD2 +0.3V
±10mA
-40°C to +105°C
-65°C to +150°C
+150°C
89.2 °C/W
55.6 °C/W
1012
Capacitance (Input-Output), CI-O
1pF
Lead Temperature, Soldering
Vapor Phase (60 sec)
+215°C
Infared (15 sec)
+220°C
ESD TBD
NOTES
1Stresses above those listed under Absolute Maximum Ratings may cause
permanent damage to the device. This is a stress rating only and functional
operation of the device at these or any other conditions above those
indicated in the operational section of this specification is not implied.
Exposure to absolute maximum rating conditions for extended periods may
affect device reliability.
2Transient currents of up to 100mA will not cause SCR latch up.
3 All voltages are relative to their respective ground.
REGULATORY INFORMATION
(PENDING)
Table 5. Insulation and Safety Related Specifications
Parameter
Input-Output Withstand Momentary
Withstand Voltage1
Minimum External Air Gap
(Clearance)
Minimum External Tracking
(Creepage)
Minimum Internal Gap (Internal
Clearance)
Tracking Resistance (Comparative
Tracking Index)
Isolation Group
Symbol Value
VISO 3750 min.
L(I01) 8.4 min
L(I02) 8.1 min
0.025 min
CTI >175
IIIa
Units
V
mm
mm
mm
V
Conditions
Note 1
Measured from input terminals to output terminals, shortest
distance through air.
Measured from input terminals to output terminals, shortest
distance path along body.
Insulation distance through insulation.
DIN IEC112/VDE 0303 Part 1
MaterialGroup(DIN VDE 0110,1/89,Table 1)
UL1
Recognized under 1577
component recognition program1
CSA
Approved under CSA Component
Acceptance Notice #5A
VDE2
Certified according to DIN EN 60747-5-2
(VDE 0884 Part 2):2003-012
Double insulation, 3750 V rms
isolation voltage
Reinforced insulation per
CSA 60950-1-03 and IEC 60950-1,
630 V rms maximum working voltage
Basic insulation, 891 V peak
Complies with DIN EN 60747-5-2 (VDE 0884 Part 2):2003-01,
DIN EN 60950 (VDE 0805):2001-12; EN 60950:2000
Reinforced insulation, 891 V peak
NOTES
1 In accordance with UL1577, each AD7400/AD7401 is proof tested by applying an insulation test voltage ≥ 4500 V rms for 1 second (current leakage detection limit =
5 µA).
2 In accordance with DIN EN 60747-5-2, each AD7400/AD7401 is proof tested by applying an insulation test voltage ≥ 1670 V peak for 1 second (partial discharge
detection limit = 5 pC).
Rev. PrH | Page 6 of 10

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