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AS1540-BQFT 参数 Datasheet PDF下载

AS1540-BQFT图片预览
型号: AS1540-BQFT
PDF下载: 下载PDF文件 查看货源
内容描述: 8/4通道,12位I2C模拟数字转换器 [8/4-Channel, 12-Bit I2C Analog-to-Digital Converter]
分类和应用: 转换器
文件页数/大小: 20 页 / 749 K
品牌: AMSCO [ AMS(艾迈斯) ]
 浏览型号AS1540-BQFT的Datasheet PDF文件第6页浏览型号AS1540-BQFT的Datasheet PDF文件第7页浏览型号AS1540-BQFT的Datasheet PDF文件第8页浏览型号AS1540-BQFT的Datasheet PDF文件第9页浏览型号AS1540-BQFT的Datasheet PDF文件第11页浏览型号AS1540-BQFT的Datasheet PDF文件第12页浏览型号AS1540-BQFT的Datasheet PDF文件第13页浏览型号AS1540-BQFT的Datasheet PDF文件第14页  
AS1538/AS1540  
Data Sheet - Detailed Description  
8 Detailed Description  
The AS1538/AS1540 successive approximation register (SAR) A/D converter architecture is based on capacitive  
redistribution which inherently includes a sample-and- hold function.  
The AS1538/AS1540 core is controlled by an internally generated free-running clock. When the device is not perform-  
ing conversions or being addressed, the A/D converter-core and internal clock are powered off.  
Figure 22. Simplified I/O Diagram  
+2.7 to  
+5.25V  
+
0.1 to  
10µF  
CH0  
CH1  
CH2  
CH3  
CH4  
CH5  
CH6  
CH7  
VDD  
+
0.1 to  
10µF  
2kΩ  
SDA  
SCL  
AS1538/  
AS1540  
Microcontroller  
A0  
A1  
COM  
GND  
REFIN/OUT  
1µF  
Analog Input  
When the converter enters the hold mode, the voltage on the selected CHx pin is captured on the internal capacitor  
array. The input current on the analog inputs depends on the conversion rate of the device. During the sample period,  
the source must charge the internal sampling capacitor (typically 15pF). After the capacitor has been fully charged,  
there is no further input current. The amount of charge transfer from the analog source to the converter is a function of  
conversion rate.  
Figure 23. Reference circuit  
VIN  
+2.7 to  
+5.25V  
+
-
10Ω  
CH0:CH7  
REFIN/OUT  
VDD  
+
0.1 to  
10µF  
1nF  
2kΩ  
AS1538  
SDA  
1µF  
www.austriamicrosystems.com  
Revision 1.03  
10 - 20  
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