參數(shù)資料
型號: TLC2558CDW
廠商: TEXAS INSTRUMENTS INC
元件分類: ADC
英文描述: 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20
封裝: GREEN, PLASTIC, SOIC-20
文件頁數(shù): 28/48頁
文件大?。?/td> 1072K
代理商: TLC2558CDW
TLC2554, TLC2558
5-V, 12-BIT, 400 KSPS, 4/8 CHANNEL, LOW POWER,
SERIAL ANALOG-TO-DIGITAL CONVERTERS WITH AUTO POWER DOWN
SLAS220A –JUNE 1999
34
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
power down calculations
i(AVERAGE) = (fS/fSMAX) × i(ON) + (1–fS/fSMAX) × i(OFF)
CASE 1: If VDD = 3.3 V, auto power down, and an external reference is used:
f
S +
10
kHz
f
SMAX +
200
kHz
i (ON)
+X 1 mA operating current and i(OFF) +X 1 mA auto power-down current
so
i (AVERAGE)
+ 0.05
1000
mA ) 0.95
1
mA + 51 mA
CASE 2: Now if software power down is used, another cycle is needed to shut it down.
f
S +
20
kHz
f
SMAX +
200
kHz
i (ON)
+X 1 mA operating current and i(OFF) +X 1 mA power-down current
so
i (AVERAGE)
+ 0.1
1000
mA ) 0.9
1
mA + 101 mA
In reality this will be less since the second conversion never happened. It is only the additional cycle to shut down
the ADC.
相關(guān)PDF資料
PDF描述
TLC2554IPWR 4-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO16
TLC2554CD 4-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO16
TLC2554CDR 4-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO16
TLC2554IPW 4-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO16
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