參數(shù)資料
型號(hào)： TLC1542QN
廠商： TEXAS INSTRUMENTS INC
元件分類： ADC
英文描述： 11-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDIP20
封裝： PLASTIC, DIP-20
文件頁(yè)數(shù)： 33/36頁(yè)
文件大小： 748K
代理商： TLC1542QN
TLC1542C, TLC1542I, TLC1542M, TLC1542Q, TLC1543C, TLC1543I, TLC1543Q
10BIT ANALOGTODIGITAL CONVERTERS WITH
SERIAL CONTROL AND 11 ANALOG INPUTS
SLAS052F MARCH 1992 REVISED JANUARY 2004
6
WWW.TI.COM
analog inputs and test modes (continued)
Table 2. Analog-Channel-Select Address
ANALOG INPUT
SELECTED
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
INTERNAL
SELF-TEST
VOLTAGE
VALUE SHIFTED INTO
ADDRESS INPUT
OUTPUT RESULT (HEX)
SELF-TEST
VOLTAGE
SELECTED
BINARY
HEX
OUTPUT RESULT (HEX)
Vref+ Vref
2
1011
B
200
Vref
1100
C
000
Vref+
1101
D
3FF
Vref+ is the voltage applied to the REF+ input, 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 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.
相關(guān)PDF資料
PDF描述
TLC1542QDW 11-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20
TLC1542QDBR 11-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20
TLC1543QN 11-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDIP20
TLC1543QDBLE 11-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20
TLC1542QDBLE 11-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20
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