參數(shù)資料
型號： TLC1543QFN
廠商： TEXAS INSTRUMENTS INC
元件分類： ADC
英文描述： 11-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PQCC20
封裝： PLASTIC, LCC-20
文件頁數(shù)： 29/32頁
文件大?。?/td> 770K
代理商： TLC1543QFN
www.ti.com
Vref+ Vref
2
CONVERTER AND ANALOG INPUT
SLAS052G – MARCH 1992 – REVISED JANUARY 2006
Table 2. ANALOG-CHANNEL-SELECT ADDRESS
VALUE SHIFTED INTO ADDRESS
INPUT
ANALOG INPUT SELECTED
BINARY
HEX
A0
0000
0
A1
0001
1
A2
0010
2
A3
0011
3
A4
0100
4
A5
0101
5
A6
0110
6
A7
0111
7
A8
1000
8
A9
1001
9
A10
1010
A
Table 3. TEST-MODE-SELECT ADDRESS
VALUE SHIFTED INTO
INTERNAL SELF-TEST
ADDRESS INPUT
OUTPUT RESULT (HEX)(2)
VOLTAGE SELECTED(1)
BINARY
HEX
1011
B
200
Vref-
1100
C
000
Vref+
1101
D
3FF
(1)
Vref+ is the voltage applied to the REF+ input, and Vref- is the voltage applied to the REF- input.
(2)
The output results shown are the ideal values and vary with the reference stability and with internal
offsets.
The CMOS threshold detector in the successive-approximation conversion system determines each bit by
examining the charge on a series of binary-weighted capacitors (see Figure 1). In the first phase of the
conversion process, the analog input is sampled by closing the SC switch and all ST switches simultaneously.
This action charges all the capacitors to the input voltage.
In the next phase of the conversion process, all ST and SC switches are opened and the threshold detector
begins identifying bits by identifying the charge (voltage) on each capacitor relative to the reference (REF-)
voltage. In the switching sequence, ten capacitors are examined separately until all ten bits are identified and
then the charge-convert sequence is repeated. In the first step of the conversion phase, the threshold detector
looks at the first capacitor (weight = 512). Node 512 of this capacitor is switched to the REF+ voltage, and the
equivalent nodes of all the other capacitors on the ladder are switched to REF-. If the voltage at the summing
node is greater than the trip point of the threshold detector (approximately one-half VCC), a 0 bit is placed in the
output register and the 512-weight capacitor is switched to REF-. If the voltage at the summing node is less than
the trip point of the threshold detector, a 1 bit is placed in the register and the 512-weight capacitor remains
connected to REF+ through the remainder of the successive-approximation process. The process is repeated for
the 256-weight capacitor, the 128-weight capacitor, and so forth down the line until all bits are counted.
With each step of the successive-approximation process, the initial charge is redistributed among the capacitors.
The conversion process relies on charge redistribution to count and weigh the bits from MSB to LSB.
6
相關(guān)PDF資料
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TLC1543IDB 11-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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TLC1549CD 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Single In Serial 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32
TLC1549CDG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10-Bit 38 kSPS Serial Out 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32
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