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| 型号： | TLC1543CNE4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | ADC |
| 英文描述： | 11-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDIP20 |
| 封装： | ROHS COMPLIANT, PLASTIC, MS-001AD, DIP-20 |
| 文件页数： | 29/32页 |
| 文件大小： | 770K |
| 代理商： | TLC1543CNE4 |
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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
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相关代理商/技术参数 |
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|---|---|
| TLC1543-EP | 制造商:TI 制造商全称:Texas Instruments 功能描述:10-BIT ANALOG-TO-DIGITAL CONVERTERS WITH SERIAL CONTROL AND 11ANALOG INPUTS |
| TLC1543I | 制造商:TI 制造商全称:Texas Instruments 功能描述:10-BIT ANALOG-TO-DIGITAL CONVERTERS WITH SERIAL CONTROL AND 11 ANALOG INPUTS |
| TLC1543IDB | 功能描述:模数转换器 - ADC 10Bit 38kSPS SerOut On-Chip Sys Clk 11Ch RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| TLC1543IDBG4 | 功能描述:模数转换器 - ADC 10Bit 38kSPS SerOut On-Chip Sys Clk 11Ch RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| TLC1543IDBLE | 制造商:TI 制造商全称:Texas Instruments 功能描述:10-BIT ANALOG-TO-DIGITAL CONVERTERS WITH SERIAL CONTROL AND 11 ANALOG INPUTS |
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