BA335 查看數據表（PDF） - ROHM Semiconductor

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BA335

Audio level sensor

ROHM Semiconductor 

Audio ICs

BA335

FAttached components

C1 : Input coupling capacitor. 1 to 2.2µF recommended.

C2 : AC bypass capacitor. 0.1 to 0.47µF recommended.

R1, C3 : Resistor and capacitor for setting time delay.

R2, C4 : Resistor and capacitor for ripple filter.

FInput characteristics

As shown in Fig. 4, VP6 and VP8 invert when the input

reaches approximately *45dBm. VP8 is designed to be

able to directly drive the NPN small signal transistor at

this time. When on, VP6 is capable of accepting a maxi-

mum of 600mA of current (this will vary as shown in the

duty cycle table). A continuous ON should last for no

more than 3 seconds.

Time delay using the hysteresis comparator is as follows.

When an input signal of *45dBm or more goes to noth-

ing ceases, the electrical potential of Pin 2 begins to fall

due to the CR circuit connected to Pin 2. The time until

the hysteresis comparator inverts is the time delay. When

deciding the values of the capacitor and resistor, select

a resistor value from 100 to 500kΩ.

831

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