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| 型號(hào)： | TLV1543M |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 3.3-V 10-BIT ANALOG-TO-DIGITAL CONVERTERS WITH SERIAL CONTROL AND 11 ANALOG INPUTS |
| 中文描述： | 3.3 V的10位模擬數(shù)字轉(zhuǎn)換器與串行控制和11個(gè)模擬輸入 |
| 文件頁(yè)數(shù)： | 6/18頁(yè) |
| 文件大?。?/td> | 295K |
| 代理商： | TLV1543M |
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TLV1543C, TLV1543M
3.3-V 10-BIT ANALOG-TO-DIGITAL CONVERTERS
WITH SERIAL CONTROL AND 11 ANALOG INPUTS
SLAS072C – DECEMBER 1992 – REVISED MARCH 1995
6
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Table 2. Analog-Channel-Select Address
ANALOG INPUT
SELECTED
VALUE SHIFTED INTO
ADDRESS INPUT
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
INTERNAL SELF-TEST
VOLTAGE SELECTED
VALUE SHIFTED INTO
ADDRESS INPUT
OUTPUT RESULT (HEX)
BINARY
HEX
Vref
– Vref–
2
Vref–
Vref+
1011
B
200
1100
C
000
1101
D
3FF
Vref+ s the voltage applied to the REF+ nput, and Vref– is the voltage applied to the REF–
input.
The output results shown are the ideal values and vary with the reference stability and with
internal offsets.
converter and analog input
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 S
C
switch and all S
T
switches simultaneously.
This action charges all the capacitors to the input voltage.
In the next phase of the conversion process, all S
T
and S
C
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
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 the V
CC
voltage), a bit 0 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 bit 1 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.
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| TLV1543MFK | 3.3-V 10-BIT ANALOG-TO-DIGITAL CONVERTERS WITH SERIAL CONTROL AND 11 ANALOG INPUTS |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TLV1543MFK | 制造商:TI 制造商全稱:Texas Instruments 功能描述:3.3V 10 BIT ANALOG TO DIGITAL CONVERTERS WITH SERIAL CONTROL AND 11 ANALOG INPUTS |
| TLV1543MFKB | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| TLV1543MJ | 制造商:TI 制造商全稱:Texas Instruments 功能描述:3.3V 10 BIT ANALOG TO DIGITAL CONVERTERS WITH SERIAL CONTROL AND 11 ANALOG INPUTS |
| TLV1543MJB | 制造商:TI 制造商全稱:Texas Instruments 功能描述:3.3V 10 BIT ANALOG TO DIGITAL CONVERTERS WITH SERIAL CONTROL AND 11 ANALOG INPUTS |
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