BA3812L Просмотр технического описания (PDF) - ROHM Semiconductor

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производитель

BA3812L

5-channel graphic equalizer

ROHM Semiconductor 

Audio ICs

FSolid-state inductor

A solid state inductor uses an active element and has the

equivalent function of an inductor. The circuit shown in

Fig. 4 is used in the BA3812L. This circuit employs two

capacitors, a potentiometer, and a bias capacitor as ex-

ternal components, everything else is on the chip.

The resonance frequency (fo) and the Q of the circuit are

fixed by the values of the external capacitors.

The circuit Q is obtained from the following formula:

Q = CR1

CO RO

BA3812L

The resonance frequency is obtained from the following

formula:

1

fo (Hz) =

(R: Ω, C: F)

2π R0R1CC0

Q is the factor that determines the bandwidth of the fre-

quency. If the amount of boost and cut are the same for

the same resonance frequency, the larger the value of Q,

the narrower the resonant frequency band.

FElectrical characteristic curves

449

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