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AD7400 데이터시트 PDF




Analog Devices에서 제조한 전자 부품 AD7400은 전자 산업 및 응용 분야에서
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부품번호 AD7400 기능
기능 Isolated Sigma-Delta Modulator
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AD7400 데이터시트, 핀배열, 회로
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 pdf, 반도체, 판매, 대치품
AD7400/AD7401
Preliminary Technical Data
AD7401—SPECIFICATIONS3
Table 2. (VDD1 = VDD2 = 4.5V to 5.5V, , VIN+ = -200mV to +200mV and VIN- = 0V; TA = TMIN to TMAX, fMCLK = 20MHz unless
otherwise noted.)
Parameter
STATIC PERFORMANCE
B Version1,5 Units
Test Conditions/Comments
When Tested with Sinc3 Filter4
Resolution
Integral Nonlinearity2
Differential Nonlinearity2
Offset Error2
Offset Drift vs. Temperature2
Offset Drift vs. VDD12
Absolute Reference Voltage Tolerance
Reference Voltage Matching
VREF Drift vs. Temperature2
VREF Drift vs. VDD12
ANALOG INPUT
Input Voltage Ranges6
DC Leakage Current
DYNAMIC SPECIFICATIONS
Signal to Noise + Distortion Ratio (SINAD) 4
Total Harmonic Distortion (THD)2
Peak Harmonic or Spurious Noise (SFDR)2
Effective number of bits
Isolation Transient Immunity
Signal Delay
LOGIC INPUTS
Input High Voltage, VINH
Input Low Voltage, VINL
Input Current, IIN
Input Capacitance, CIN3
LOGIC OUTPUTS
Output High Voltage, VOH
Output Low Voltage, VOL
POWER REQUIREMENTS
VDD1
VDD2
IDD17
IDD27
16
±4
±0.9
±0.5
5
2
0.05
±1
±TBD
60
0.2
±200
±1
70
76
-80
-70
12
15
20
10
12
2
0.8
±1
10
VDD2 – 0.1
0.4
+4.5/+5.5
+4.5/+5.5
+2.7/+3.3
21.2
3.92
Bits min
LSB max
LSB max
mV max
µV/ЊC max
µV/ЊC typ
mV/V typ
%min/max
%min/max
ppm/ЊC typ
% typ
Filter output trunctaed to 16 Bits
Guaranteed No Missed Codes to 15 bits
Bipolar Input Range
mV min/max
µA max
dBmin
dB typ
dB typ
dB typ
Bits
kV/µs min
kV/µs typ
µs typ
µs max
When Tested with Sinc3 Filter4
VIN+ = 35Hz, 400mVpk-pk sine wave
Delay through filter varies with actual value of on-
board clock. Decimation by 2.
V min
V max
µA max
pF max
V min
V max
IO = -20 µA
IO = 20 µA
Vmin/Vmax
Vmin/Vmax
Vmin/Vmax
mA max
mA max
VDD1 = 5V, Digital I/Ps = 0 V or VDD1
NOTES
3 Temperature ranges as follows: -40ЊC to +105ЊC
4 See Terminology section.
3 Sample tested @ 25ЊC to ensure compliance.
4 Filter as defined by Verilog Code.
5 All voltages are relative to their respective ground.
6 Beyond the full-scale input range the output is either all zeroes or all ones.
Specifications subject to change without notice.
Rev. PrH | Page 4 of 10

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AD7400 전자부품, 판매, 대치품
Preliminary Technical Data
AD7400/AD7401
DIN EN 60747-5-2 (VDE 0884 PART 2) INSULATION CHARACTERISTICS (PENDING)
Table 6.
Description
Installation classification per DIN VDE 0110
For Rated Mains Voltage ≤ 300 V rms
For Rated Mains Voltage ≤ 600 V rms
Climatic Classification
Pollution Degree (DIN VDE 0110, Table 1)
Maximum Working Insulation Voltage
Input to Output Test Voltage, Method b1
VIORM × 1.875 = VPR, 100% Production Test,
tm = 1 sec, Partial Discharge < 5 pC
Input to Output Test Voltage, Method a
After Environmental Tests Subgroup 1)
VIORM × 1.6 = VPR, tm = 60 sec, Partial Discharge < 5p C
After Input and/or Safety Test Subgroup 2/3)
VIORM × 1.2 = VPR, tm = 60 sec, Partial Discharge < 5p C
Highest Allowable Overvoltage
(Transient Overvoltage, tTR = 10 sec)
Safety-Limiting Values (Maximum value allowed in the event of a failure, also see Thermal
Derating Curve)
Case Temperature
Side 1 Current
Side 2 Current
Insulation Resistance at TS, VIO = 500 V
Symbol Characteristic
VIORM
VPR
I–IV
I–III
40/105/21
2
891
1670
VPR
1426
1069
VTR 6000
TS 150
IS1 TBD
IS2 TBD
RS >109
Unit
Vpeak
V peak
Vpeak
Vpeak
V peak
°C
mA
mA
This isolator is suitable for “basic electrical isolation” only within the safety limit data. Maintenance of the safety data shall be ensured by
means of protective circuits.
"*" marking on packages denotes DIN EN 60747-5-2 approval for 891 V peak working voltage.
Rev. PrH | Page 7 of 10

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