參數(shù)資料
型號: TLC2558CPW
廠商: Texas Instruments, Inc.
英文描述: BUTT SPLICE,NON-INS. RoHS Compliant: Yes
中文描述: 5五,12位400 ksps的,4 / 8通道,低功耗,串行模數(shù)位自動開機(jī)和下變頻器
文件頁數(shù): 34/37頁
文件大?。?/td> 566K
代理商: TLC2558CPW
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) = (f
S
/f
SMAX
)
×
i(ON) + (1–f
S
/f
SMAX
)
×
i(OFF)
CASE 1: If V
DD
= 3.3 V, auto power down, and an external reference is used:
fS
10 kHz
fSMAX
i(ON)
200 kHz
1 mA operating current and i(OFF)
1
A auto power-down current
so
i(AVERAGE)
0.05
1000
A
0.95
1
A
51
A
CASE 2: Now if software power down is used, another cycle is needed to shut it down.
fS
20 kHz
fSMAX
i(ON)
200 kHz
1 mA operating current and i(OFF)
1
A power-down current
so
i(AVERAGE)
0.1
1000
A
0.9
1
A
101
A
In reality this will be less since the second conversion never happened. It is only the additional cycle to shut down
the ADC.
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