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參數(shù)資料
| 型號(hào)： | MP3274 |
| 廠商： | Exar Corporation |
| 英文描述： | Fault Protected 32 Channel, 12-Bit Data Acquisition Subsystem |
| 中文描述： | 故障保護(hù)32頻道，12位數(shù)據(jù)采集子系統(tǒng) |
| 文件頁(yè)數(shù)： | 1/16頁(yè) |
| 文件大?。?/td> | 170K |
| 代理商： | MP3274 |
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MP3274
1
Rev. 4.00
Fault Protected 32 Channel, 12-Bit
Data Acquisition Subsystem
FEATURES
Complete 32-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
Parallel or Serial Data Output Modes
65 ns Bus Access Time
Remote Analog Ground Sensing
Overvoltage Protected Input (
Supply Voltages)
50 V over the
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 (3 mW per Channel Typical)
16 Channel Version: MP3276 & MP3275
GENERAL DESCRIPTION
The MP3274 is a complete 32-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 32-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
50 V over the supply voltages. Therefore, an overvoltage
to
condition can exist on unselected channels without disrupting
the measured channel or operation of the MP3274! The internal
4 V reference has sufficient output current to provide other sys-
tem reference needs. Precision thin film scaling and offset resis-
tors are laser trimmed to provide for less than 2 LSB INL for +10
V inputs on all channels.
In addition, the MP3274 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
32
5
32 Ch.
MUX
AB0-4
(5 pins)
AIN0-31
(32 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
REF IN
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MP3274AG | Fault Protected 32 Channel, 12-Bit Data Acquisition Subsystem |
| MP3274AP | Fault Protected 32 Channel, 12-Bit Data Acquisition Subsystem |
| MP3274SG | Fault Protected 32 Channel, 12-Bit Data Acquisition Subsystem |
| MP3275 | Fault Protected 16 Channel, 12-Bit Data Acquisition Subsystem |
| MP3275AE | Fault Protected 16 Channel, 12-Bit Data Acquisition Subsystem |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MP3274AG | 制造商:EXAR 制造商全稱:EXAR 功能描述:Fault Protected 32 Channel, 12-Bit Data Acquisition Subsystem |
| MP3274AP | 制造商:EXAR 制造商全稱:EXAR 功能描述:Fault Protected 32 Channel, 12-Bit Data Acquisition Subsystem |
| MP3274SG | 制造商:EXAR 制造商全稱:EXAR 功能描述:Fault Protected 32 Channel, 12-Bit Data Acquisition Subsystem |
| MP3275 | 制造商:EXAR 制造商全稱:EXAR 功能描述:Fault Protected 16 Channel, 12-Bit Data Acquisition Subsystem |
| MP3275AE | 制造商:EXAR 制造商全稱:EXAR 功能描述:Fault Protected 16 Channel, 12-Bit Data Acquisition Subsystem |
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