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參數(shù)資料
| 型號： | MP3276AP |
| 廠商： | EXAR CORP |
| 元件分類： | ADC |
| 英文描述： | Fault Protected 16 Channel, 12-Bit Data Acquisition Subsystem |
| 中文描述： | 16-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL/PARALLEL ACCESS, PQCC68 |
| 封裝： | PLASTIC, LCC-68 |
| 文件頁數(shù)： | 1/16頁 |
| 文件大?。?/td> | 170K |
| 代理商： | MP3276AP |
MP3276
1
Rev. 4.00
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 15
μ
S
Microprocessor Bus Interface
2’s Complement Data Output
Parallel or Serial Data Output Modes
65 ns Bus Access Time
Remote Analog Ground Sensing
Overvoltage Protected Input (
ply 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: 110 mW typ. (7 mW per Channel typ.)
32 Channel Version: MP3274
50 V over the Sup-
GENERAL DESCRIPTION
The MP3276 is a complete 16-channel, 12-bit Data Acquisi-
tion Subsystem with 3-state output buffers for direct interfacing
to 16-bit microprocessor buses. 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 comparator, a
precision reference and the control logic to achieve an accurate
repeated conversion in less than 15
μ
s, and a mux/instrumenta-
tion amp settling period of less than 10
μ
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 MP3276! 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 MP3276 will output either full scale (0111 ....)
for overrange and – full scale (1000....) for underrange condi-
tions. This greatly simplifies microprocessor software develop-
ment.
SIMPLIFIED BLOCK DIAGRAM
–
+
Comp
SAR
4 V
REF
16
4
16 Ch.
MUX
AB0-3
(4 pins)
AIN0-15
(16 pins)
REF OUT
Control
Logic
GND REF.
DGND
V
EE
VDAC
Latch/
Shift Register
3-state
Drivers
12
DB0-DB11
REF IN /2
12
V
DD
V
CC
CLK
WR RD
CS
PXS
ADEN
STL
STS
AGND
V
REF
AGND
2
AGND
3
AGND
GND
REF IN
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