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LM4970 Datasheet(PDF) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part # LM4970
Description  Audio Synchronized Color LED Driver
PDF  15 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM4970 Datasheet(HTML) 5 Page - National Semiconductor (TI)

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External Components Description
Components
Functional Description
1.
C
i
This is the input coupling capacitor. It blocks the DC voltage and couples the input signal to the
amplifier’s input terminals. C
IN also creates a highpass filter with an internal 20k
Ω resistor at f
c =
1/(2
π.20000.C
i).
2.
C
S
This is the supply bypass capacitor. It filters the supply voltage applied to the V
DD pin and helps
reduce the noise at the V
DD pin.
3.
C
filt
This capacitor creates a low pass filter with an internal 4k
Ω resistor at f
c = 1/(2
π*4000*C
filt). This pole
set at f
c determines the high cutoff frequency for the low band PWM color LED driver output, LED1.
Typical Performance Characteristics (Note 11)
Audio Sync LED Frequency Response
(Left - lowband, Mid - midband, Right - highband)
(Cfilt = 0.047µF, HPF = 3.5kHz setting)
Audio Sync LED Frequency Response
(Left - lowband, Mid - midband, Right - highband)
(Cfilt = 0.068µF, HPF = 3.5kHz setting)
20121265
20121266
Audio Sync LED Frequency Response
(Left - lowband, Mid - midband, Right - highband)
(Cfilt = 0.1µF, HPF = 3.5kHz setting)
Audio Sync LED Frequency Response
(Left - lowband, Mid - midband, Right - highband)
(Cfilt = 0.22µF, HPF = 3.5kHz setting)
20121267
20121268
www.national.com
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