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AD7400AYRWZREEL7

更新时间： 2024-01-21 08:06:15
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亚德诺 - ADI /
页数 文件大小 规格书
19页 321K
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Isolated Sigma-Delta Modulator

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AD7400AYRWZREEL7 数据手册

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Isolated Sigma-Delta Modulator  
Preliminary Technical Data  
AD7400A  
FEATURES  
GENERAꢀ DESCRIPTION  
10 MHz clock rate  
Second-order modulator  
16 bits no missing codes  
2 ꢀSB INꢀ typical at 16 bits  
3.5 µV/°C maximum offset drift  
On-board digital isolator  
On-board reference  
ꢀow power operation: 18 mA maximum at 5.25 V  
−40°C to +125°C operating range  
16-lead SOIC, 8-lead gull-wing surface mount DIP packages  
AD7401A, external clock version  
Safety and regulatory approvals  
Uꢀ recognition  
The AD7400A1 is a second-order, Σ-Δ modulator that converts  
an analog input signal into a high speed, 1-bit data stream with  
on-chip digital isolation based on Analog Devices, Inc.  
iCoupler® technology. The AD7400A operates from a 5 V power  
supply and accepts a differential input signal of ±±00 mV  
(±ꢀ±0 mV full scale). 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 a data rate of  
10 MHz. The original information can be reconstructed with an  
appropriate digital filter. The serial I/O can use a 5 V or a ꢀ V  
supply (VDD±).  
The serial interface is digitally isolated. High speed CMOS,  
combined with monolithic air core transformer technology,  
means the on-chip isolation provides outstanding performance  
characteristics superior to alternatives such as optocoupler  
devices. The part contains an on-chip reference. The AD7400A  
is offered in a 16-lead SOIC and 8-lead gull-wing surface mount  
DIP and has an operating temperature range of −40°C to  
+1±5°C.  
3750 V rms for 1 minute per Uꢀ 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 = 891 V peak  
APPꢀICATIONS  
AC motor controls  
Data acquisition systems  
A/D + opto-isolator replacements  
FUNCTIONAꢀ BꢀOCK DIAGRAM  
V
V
DD2  
DD1  
AD7400A  
V
V
+
IN  
T/H  
Σ-∆ ADC  
–
IN  
UPDATE  
WATCHDOG  
ENCODE  
DECODE  
BUF  
MDAT  
REF  
CONTROL LOGIC  
UPDATE  
WATCHDOG  
ENCODE  
MCLKOUT  
DECODE  
GND  
GND  
1
2
Figure 1.  
1 Protected by U.S. Patents 5,952,849; 6,873,065; and 7,075,329. Other patents pending.  
Rev. PrA  
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 registeredtrademarks arethe property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700  
Fax: 781.461.3113  
www.analog.com  
©2008 Analog Devices, Inc. All rights reserved.  
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