SM6453AB データシートの表示（PDF） - Nippon Precision Circuits

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SM6453AB

3-wire Serial Data Volume Control for Headphone Amplifier IC

Nippon Precision Circuits  

SM6453AB

Bass boost function (BSTO, BSTN, BSTC)

The bass boost characteristic (BB1, BB2) is selected using bit D10. The left-channel and right-channel bass

components are mixed and amplified, and then added to the headphone driver amplifier. A capacitor (0.1µF std)

connected between BSTC and VREF1 forms a lowpass filter through which the signal from the EVR block

passes, boosting the bass component, which is then added to the original signal.

Bass boost examples

IC internal components are RIN = 23kΩ, R1 = 20kΩ, R2 = 10kΩ, R3 = 15kΩ (BB1) or 60kΩ (BB2). The bass

boost characteristic also depends on the external resistor and capacitor components connected between BSTO

and BSTN, as indicated below.

I Example 1

C1 = 0.1µF, C2 = 2200pF, CIN = 1µF, COUT = 220µF, ROUT = 16Ω (Measurement circuit)

15

10

5

0

-5

-10

-15

10

BB2

BB1

BB OFF

100

1000

Frequency [Hz]

I Example 2

C1 = 0.1µF, C2 = 0.01µF, CIN = 1µF, COUT = 220µF, ROUT = 16Ω

10000

15

10

5

0

-5

-10

-15

10

BB2

BB1

BB OFF

100

1000

Frequency [Hz]

10000

NIPPON PRECISION CIRCUITS INC.—13

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