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MP3275 PDF预览

MP3275

更新时间: 2024-11-20 21:53:59
品牌 Logo 应用领域
艾科嘉 - EXAR /
页数 文件大小 规格书
16页 141K
描述
Fault Protected 16 Channel, 12-Bit Data Acquisition Subsystem

MP3275 数据手册

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MP3275  
Fault Protected 16 Channel, 12-Bit  
Data Acquisition Subsystem  
FEATURES  
Fault Protected 16-Channel 12-Bit A/D  
Converter with Sample & Hold, Reference,  
Clock and 3-State Outputs  
Fast Conversion, less than 15µS  
2’s Complement and Serial Data Output  
Remote Analog Ground Sensing  
Overvoltage Protected Input (50 V over the  
Supply Voltages)  
Precision Reference for Long Term Stability and  
Low Gain T.C.  
Guaranteed Linearity Over Temperature  
Guaranteed Performance at +12/–5 V, ±12 & ±15 V  
Low Power (7 mW per Channel Typical)  
Parallel Version: MP3276  
32 Channel Version: MP3274  
GENERAL DESCRIPTION  
The MP3275 is a complete 16-channel, 12-bit Data Acquisi-  
tion Subsystem with serial data port. Implemented using an ad-  
vanced BiCMOS process, the converter combines a16-channel  
passive overvoltage-protected multiplexer instrumentation  
amp, a sample & hold, a SAR, a 12-bit decoded D/A, a compa-  
rator, a precision reference and the control logic to achieve an  
accurate conversion in less than 15µs, and a mux/instrumenta-  
tion amp settling period of less than 10µs.  
foranovervoltageconditiononunselectedchannelswithoutdis-  
rupting the measured channel or operation of the MP3275! The  
internal 4 V reference has sufficient output current to provide  
other system reference needs. Precision thin film scaling and  
offset resistors are laser trimmed to provide for less than 2 LSB  
INL for +10 V inputs on all channels.  
In addition, the MP3275 will output either full scale (0111 ....)  
for overrange and – full scale (1000....) for underrange condi-  
tions. This greatly simplifies microprocessor software develop-  
ment.  
A unique input design provides input overvoltage protection  
to 50 V over the supply voltages. The circuit design can allow  
SIMPLIFIED BLOCK DIAGRAM  
V
DD  
V
CC  
GND REF.  
AGND  
Comp  
AB0-3  
(4 pins)  
+
4
16  
A
-15  
IN0  
Ch.  
MUX  
(16 pins)  
REF IN /2  
16  
AGND  
2
V
REF  
VDAC  
4 V  
REF  
REF OUT  
12  
CLK  
SAR  
12  
AGND  
3
Control  
Logic  
Latch/  
Shift Register  
SDC  
3-State  
Driver  
SDO  
DGND  
V
EE  
WR  
CS  
STS  
STL  
DGND  
RD ADEN  
Rev. 4.00  
1

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