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| SM5301BS Datasheet, PDF (11/15 Pages) Nippon Precision Circuits Inc – 3-channel Video Buffer with Built-in Wideband Filters with Filter Through Function | |||
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SM5301BS
Adjusting the Cutoff Frequency
Constant-voltage control 1
Cutoff frequency control using a reference voltage VR generated by voltage divider formed by R1 and R2.
VR
R1
VFC
R2
RFC
Constant-voltage control 2
Cutoff frequency control by adjusting the resistance connected to RFC.
VFC
VR
RFC
PWM control
Cutoff frequency control by smoothing the PWM signal, using R1 and C1, input to VFC.
PWM
R1
VFC
C1
RFC
When VFC = 0.2V VDD = 3.3V, 6% duty drive
VDD = 5.0V, 4% duty drive
When VFC = 1.6V VDD = 3.3V, 48% duty drive
VDD = 5.0V, 32% duty drive
Note: The resistor connected to RFC can affect the cutoff frequency response, so a high-precision component
should be used. It is recommended to set the RC ï¬lter cutoff frequency to < 1/100fc of the PWM wave-
form frequency.
SEIKO NPC CORPORATION â11
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