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參數(shù)資料
| 型號： | ADC08231 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 串行ADC |
| 英文描述： | 8-Bit 2 ms Serial I/O A/D Converters with MUX, Reference, and Track/Hold |
| 中文描述： | 8位2毫秒串行I /辦公自動化/ D的多路復用器，參考轉換器，和采樣/保持 |
| 文件頁數(shù)： | 15/24頁 |
| 文件大?。?/td> | 419K |
| 代理商： | ADC08231 |
Functional Description
(Continued)
Since the input configuration is under software control, it
can be modified as required before each conversion. A
channel can be treated as a single-ended, ground refer-
enced input for one conversion; then it can be reconfigured
as part of a differential channel for another conversion.Fig-
ure 1 illustrates the input flexibility which can be achieved.
The analog input voltages for each channel can range from
50mV below ground to 50mV above V
CC
(typically 5V) with-
out degrading conversion accuracy.
2.0 THE DIGITAL INTERFACE
A most important characteristic of these converters is their
serial data link with the controlling processor. Using a serial
communication format offers two very significant system im-
provements; it allows many functions to be included in a
small package and it can eliminate the transmission of low
level analog signals by locating the converter right at the
analog sensor; transmitting highly noise immune digital data
back to the host processor.
To understand the operation of these converters it is best to
refer to the Timing Diagrams and Functional Block Diagram
and to follow a complete conversion sequence. For clarity a
separate timing diagram is shown for each device.
1. A conversion is initiated by pulling the CS (chip select)
line low. This line must be held low for the entire conver-
sion. The converter is now waiting for a start bit and its
MUX assignment word.
2. On each rising edge of the clock the status of the data in
(DI) line is clocked into the MUX address shift register.
The start bit is the first logic ‘‘1’’ that appears on this line
(all leading zeros are ignored). Following the start bit the
converter expects the next 2 to 4 bits to be the MUX
assignment word.
8 Single-Ended
8 Pseudo-Differential
4 Differential
Mixed Mode
TL/H/11015–17
FIGURE 1. Analog Input Multiplexer Options for the ADC08238
15
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| ADC08231BIN | 8-Bit 2 ms Serial I/O A/D Converters with MUX, Reference, and Track/Hold |
| ADC08231CIN | 8-Bit 2 ms Serial I/O A/D Converters with MUX, Reference, and Track/Hold |
| ADC08234BIN | 8-Bit 2 ms Serial I/O A/D Converters with MUX, Reference, and Track/Hold |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ADC08231BIJ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog-to-Digital Converter， 8-Bit |
| ADC08231BIN | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:8-Bit 2 ms Serial I/O A/D Converters with MUX, Reference, and Track/Hold |
| ADC08231BIWM | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:8-Bit 2 ms Serial I/O A/D Converters with MUX, Reference, and Track/Hold |
| ADC08231CIJ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog-to-Digital Converter， 8-Bit |
| ADC08231CIN | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:8-Bit 2 ms Serial I/O A/D Converters with MUX, Reference, and Track/Hold |
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