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MP3275 Datasheet

  • MP3275

  • Fault Protected 16 Channel, 12-Bit Data Acquisition Subsyste...

  • 16頁

  • EXAR   EXAR

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MP3275
Fault Protected 16 Channel, 12-Bit
Data Acquisition Subsystem
FEATURES
鈥?/div>
Fault Protected 16-Channel 12-Bit A/D
Converter with Sample & Hold, Reference,
Clock and 3-State Outputs
鈥?/div>
Fast Conversion, less than 15碌S
鈥?/div>
2鈥檚 Complement and Serial Data Output
鈥?/div>
Remote Analog Ground Sensing
鈥?/div>
Overvoltage Protected Input (50 V over the
Supply Voltages)
鈥?/div>
Precision Reference for Long Term Stability and
Low Gain T.C.
鈥?/div>
Guaranteed Linearity Over Temperature
鈥?/div>
Guaranteed Performance at +12/鈥? V,
鹵12
&
鹵15
V
鈥?/div>
Low Power (7 mW per Channel Typical)
鈥?/div>
Parallel Version: MP3276
鈥?/div>
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 a 16-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 15碌s, and a mux/instrumenta-
tion amp settling period of less than 10碌s.
A unique input design provides input overvoltage protection
to
50
V over the supply voltages. The circuit design can allow
for an overvoltage condition on unselected channels without dis-
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 鈥?full scale (1000....) for underrange condi-
tions. This greatly simplifies microprocessor software develop-
ment.
SIMPLIFIED BLOCK DIAGRAM
GND REF.
V
DD
V
CC
AGND
AB0-3
(4 pins)
A
IN0
-15
(16 pins)
AGND
2
4
16
16
Ch.
MUX
鈥?/div>
+
REF IN /2
V
REF
VDAC
Comp
REF OUT
4V
REF
CLK
12
SAR
12
AGND
3
Control
Logic
Latch/
Shift Register
3-State
Driver
SDC
DGND V
EE
WR
RD
STS
CS
ADEN
STL
DGND
SDO
Rev. 4.00
1

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