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參數(shù)資料
| 型號： | TLC4545IDRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | ADC |
| 英文描述： | 1-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO8 |
| 封裝： | GREEN, PLASTIC, MS-012AA, SOIC-8 |
| 文件頁數(shù)： | 8/26頁 |
| 文件大小： | 652K |
| 代理商： | TLC4545IDRG4 |
TLC4541, TLC4545
SLAS293 DECEMBER 2001
16
www.ti.com
PRINCIPLES OF OPERATION
1
MSB
9
8
2
2
MSB
MSB
MSB1
19
8
2
OR
th7
tsu7
th7
tsu6
tcyc(reset)
Normal Cycle Begins
Initialization Cycle (Reset)
SCLK
CS
FS
SDO
Figure 21. Critical Timing: Initialization Cycle (TLC4541 Only)
detailed description
The TLC4541/5 are successive approximation (SAR) ADCs utilizing a charge-redistribution DAC. Figure 22
shows a simplified version of the ADC. The sampling capacitor acquires the signal on AIN (or the AIN(+) pin for
TLC4545) during the sampling period. When the conversion process starts, the SAR control logic and charge
redistribution DAC are used to add and subtract fixed amounts of charge from the sampling capacitor to bring the
comparator into a balanced condition. When the comparator is balanced, the conversion is complete and the
ADC output code is generated.
AIN/
AIN(+)
+
GND/
AIN()
Charge
Redistribution
DAC
ADC Code
Control
Logic
Ci
Figure 22. Simplified SAR Circuit
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