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LTC1594

更新时间： 2024-09-23 22:57:35
品牌 Logo 应用领域
凌特 - Linear 转换器
页数 文件大小 规格书
24页 433K
描述
4- and 8-Channel, Micropower Sampling 12-Bit Serial I/O A/D Converters

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中文翻译

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LTC1594 数据手册

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LTC1594/LTC1598  
4- and 8-Channel,  
Micropower Sampling  
12-Bit Serial I/O A/D Converters  
U
FEATURES  
DESCRIPTION  
TheLTC®1594/LTC1598aremicropower,12-bitsampling  
A/Dconvertersthatfeature4-and8-channelmultiplexers,  
respectively. They typically draw only 320µA of supply  
currentwhenconvertingandautomaticallypowerdownto  
a typical supply current of 1nA between conversions. The  
LTC1594 is available in a 16-pin SO package and the  
LTC1598 is packaged in a 24-pin SSOP. Both operate on  
a 5V supply. The 12-bit, switched-capacitor, successive  
approximation ADCs include a sample-and-hold.  
■
12-Bit Resolution  
Auto Shutdown to 1nA  
Low Supply Current: 320µA Typ  
Guaranteed ±3/4LSB Max DNL  
■
■
■
■
Single Supply 5V Operation  
(3V Versions Available: LTC1594L/LTC1598L)  
Multiplexer: 4-Channel MUX (LTC1594)  
■
8-Channel MUX (LTC1598)  
■
Separate MUX Output and ADC Input Pins  
■
MUX and ADC May Be Controlled Separately  
On-chip serial ports allow efficient data transfer to a wide  
rangeofmicroprocessorsandmicrocontrollersoverthree  
or four wires. This, coupled with micropower consump-  
tion, makes remote location possible and facilitates trans-  
mitting data through isolation barriers.  
■
Sampling Rate: 16.8ksps  
I/O Compatible with QSPI, SPI and MICROWIRETM, etc.  
Small Package: 16-Pin Narrow SO (LTC1594)  
24-Pin SSOP (LTC1598)  
■
■
U
APPLICATIONS  
The circuit can be used in ratiometric applications or with  
an external reference. The high impedance analog inputs  
and the ability to operate with reduced spans (to 1.5V full  
scale) allow direct connection to sensors and transducers  
in many applications, eliminating the need for gain stages.  
■
Pen Screen Digitizing  
■
Battery-Operated Systems  
■
Remote Data Acquisition  
■
Isolated Data Acquisition  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
MICROWIRE is a trademark of National Semiconductor Corporation.  
■
Battery Monitoring  
Temperature Measurement  
■
U
TYPICAL APPLICATION  
24µW, 4-Channel, 12-Bit ADC Samples at 200Hz and Runs Off a 5V Supply  
OPTIONAL  
ADC FILTER  
Supply Current vs Sample Rate  
5V  
1k  
1µF  
1000  
100  
10  
T
= 25°C  
A
V
V
= 5V  
CC  
REF  
CLK  
18  
MUXOUT  
17  
ADCIN  
16  
15, 19  
V
CC  
1µF  
= 5V  
= 320kHz  
V
REF  
f
20 CH0  
21 CH1  
22 CH2  
23 CH3  
24 CH4  
SERIAL DATA LINK  
MICROWIRE AND  
SPI COMPATABLE  
10  
6
CSADC  
CSMUX  
CLK  
ANALOG  
INPUTS  
0V TO 5V  
RANGE  
5, 14  
7
12-BIT  
SAMPLING  
ADC  
8-CHANNEL  
MUX  
+
MPU  
D
IN  
1
2
3
CH5  
CH6  
CH7  
11  
D
OUT  
–
12  
13  
NC  
NC  
8
COM  
1
GND  
4, 9  
0.1  
1
10  
100  
1594/98 TA01  
SAMPLE FREQUENCY (kHz)  
1594/98 TA02  
1
1234567...24

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