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參數(shù)資料
| 型號(hào)： | AD-C0838CCN |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 串行ADC |
| 英文描述： | 8-Bit Serial I/O A/D Converters with Multiplexer Options |
| 中文描述： | 8位串行I /辦公自動(dòng)化/ D轉(zhuǎn)換器多路復(fù)用選項(xiàng) |
| 文件頁數(shù)： | 15/32頁 |
| 文件大?。?/td> | 678K |
| 代理商： | AD-C0838CCN |
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Functional Description
(Continued)
3. 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 lead-
ing zeros are ignored). Following the start bit the converter
expects the next 2 to 4 bits to be the MUX assignment word.
4. When the start bit has been shifted into the start location
of the MUX register, the input channel has been assigned
and a conversion is about to begin.An interval of
1
2
clock pe-
riod (where nothing happens) is automatically inserted to al-
low the selected MUX channel to settle. The SAR status line
goes high at this time to signal that a conversion is now in
progress and the DI line is disabled (it no longer accepts
data).
5. The data out (DO) line now comes out of TRI-STATE and
provides a leading zero for this one clock period of MUX set-
tling time.
6. When the conversion begins, the output of the SAR com-
parator, which indicates whether the analog input is greater
than (high) or less than (low) each successive voltage from
the internal resistor ladder, appears at the DO line on each
falling edge of the clock. This data is the result of the conver-
sion being shifted out (with the MSB coming first) and can be
read by the processor immediately.
7. After 8 clock periods the conversion is completed. The
SAR status line returns low to indicate this
1
2
clock cycle
later.
8. If the programmer prefers, the data can be provided in an
LSB first format [this makes use of the shift enable (SE) con-
trol line]. All 8 bits of the result are stored in an output shift
register. On devices which do not include the SE control line,
the data, LSB first, is automatically shifted out the DO line,
after the MSB first data stream. The DO line then goes low
and stays low until CS is returned high. On the ADC0838 the
SE line is brought out and if held high, the value of the LSB
remains valid on the DO line. When SE is forced low, the
data is then clocked out LSB first. TheADC0831 is an excep-
tion in that its data is only output in MSB first format.
9. All internal registers are cleared when the CS line is high.
If another conversion is desired, CS must make a high to low
transition followed by address information.
The DI and DO lines can be tied together and controlled
through a bidirectional processor I/O bit with one wire. This is
possible because the DI input is only “l(fā)ooked-at” during the
MUX addressing interval while the DO line is still in a high
impedance state.
8 Single-Ended
DS005583-53
8 Pseudo-Differential
DS005583-54
4 Differential
DS005583-55
Mixed Mode
DS005583-56
FIGURE 1. Analog Input Multiplexer Options for the ADC0838
www.national.com
15
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADC0831 | 8-Bit Serial I/O A/D Converters with Multiplexer Options(8位串行輸入/輸出帶多路選擇A/D轉(zhuǎn)換器) |
| AD101 | Circular Connector; No. of Contacts:6; Series:LJTPQ00R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:11; Circular Contact Gender:Pin; Circular Shell Style:Wall Mount Receptacle; Insert Arrangement:11-98 |
| AD109 | Circular Connector; No. of Contacts:26; Series:LJTPQ00R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:17; Circular Contact Gender:Pin; Circular Shell Style:Wall Mount Receptacle |
| AD110 | Circular Connector; MIL SPEC:MIL-DTL-38999 Series I; Body Material:Metal; Series:LJT; No. of Contacts:26; Connector Shell Size:17; Connecting Termination:Crimp; Circular Shell Style:Wall Mount Receptacle; Body Style:Straight RoHS Compliant: No |
| AD111 | SCRs 1.5 Amp, Planar |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADC0838CCN | 制造商:Texas Instruments 功能描述:IC 8BIT ADC SERIAL DIP20 838 |
| ADC0838CCN/A+ | 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 |
| ADC0838CCN/B+ | 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 |
| ADC0838CCN/NOPB | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADC0838CCN/SL160884 | 制造商:Texas Instruments 功能描述: |
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