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LTC1290DCJ PDF预览

LTC1290DCJ

更新时间： 2024-11-14 02:55:39
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
28页 384K
描述
Single Chip 12-Bit Data Acquisition System

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中文翻译

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LTC1290DCJ 数据手册

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LTC1290  
Sing le Chip 12-Bit Da ta  
Ac q uisitio n Syste m  
U
DESCRIPTIO  
EATURE  
S
F
The LTC®1290 is a data acquisition component which  
contains a serial I/O successive approximation A/D con-  
verter. It uses LTCMOSTM switched capacitor technology  
toperformeither12-bitunipolaror11-bitplus signbipolar  
A/D conversions. The 8-channel input multiplexer can be  
configuredforeithersingle-endedordifferentialinputs (or  
combinations thereof). An on-chip sample-and-hold is  
included for all single-ended input channels. When the  
LTC1290 is idle it can be powered down with a serial word  
in applications where low power consumption is desired.  
■
Software Programmable Features  
– Unipolar/Bipolar Conversion  
– Four Differential/Eight Single-Ended Inputs  
– MSB- or LSB-First Data Sequence  
– Variable Data Word Length  
– Power Shutdown  
Built-In Sample-and-Hold  
Single Supply 5V or ±5V Operation  
Direct Four-Wire Interface to Most MPU Serial Ports  
and All MPU Parallel Ports  
■
■
■
■
50kHz Maximum Throughput Rate  
The serial I/O is designed to be compatible with industry  
standardfullduplexserialinterfaces. Itallows eitherMSB-  
or LSB-first data and automatically provides 2's comple-  
ment output coding in the bipolar mode. The output data  
word can be programmed for a length of 8, 12 or 16 bits.  
This allows easy interface to shift registers and a variety of  
processors.  
U
KEY SPECIFICATIO S  
■
■
■
Resolution: 12 Bits  
Fast Conversion Time: 13µs Max Over Temp  
Low Supply Current: 6.0mA  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
LTCMOS is a trademark of Linear Technology Corporation.  
U
O
TYPICAL APPLICATI  
12-Bit 8-Channel Sampling Data Acquisition System  
SINGLE-ENDED INPUT  
0V TO 5V OR ±5V  
±15V OVERVOLTAGE RANGE*  
1k  
5V  
CH0  
CH1  
CH2  
CH3  
CH4  
CH5  
CH6  
CH7  
COM  
V
CC  
+
•
•
•
22µF  
TANTALUM  
1N5817  
ACLK  
SCLK  
TO AND FROM  
MICROPROCESSOR  
D
IN  
1N4148  
DIFFERENTIAL INPUT (+)  
D
OUT  
LTC1290  
±5V COMMON MODE RANGE (–)  
CS  
+
LT®1027  
8V TO 40V  
1µF  
•
•
•
REF  
+
–
4.7µF  
REF  
TANTALUM  
–
–5V  
1N5817  
V
DGND  
AGND  
0.1µF  
1290 • TA01  
* FOR OVERVOLTAGE PROTECTION ON ONLY ONE CHANNEL LIMIT THE INPUT CURRENT TO 15mA. FOR OVERVOLTAGE PROTECTION  
ON MORE THAN ONE CHANNEL LIMIT THE INPUT CURRENT TO 7mA PER CHANNEL AND 28mA FOR ALL CHANNELS. (SEE SECTION ON  
OVERVOLTAGE PROTECTION IN THE APPLICATIONS INFORMATION SECTION.) CONVERSION RESULTS ARE NOT VALID WHEN THE SELECTED  
–
OR ANY OTHER CHANNEL IS OVERVOLTAGED (V < V OR V > V ).  
IN  
IN  
CC  
1
1234567...28

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