MSC1157 查看數據表（PDF） - Oki Electric Industry

零件编号

产品描述 (功能)

比赛名单

MSC1157

Speaker Drive Amplifier

Oki Electric Industry 

¡ Semiconductor

MSC1157

GAIN ADJUSTMENT

1. Gain Adjustment Using Input Resistance (This approach allows gain adjustment with

fewer external components)

Standby

Select

Input

Standby

Input

Audio

Input

SEL

VCC

SP

C1

R1

STBY

AIN

VR

GND

SP

+

C2

–

Speaker

• Cutoff frequency fc on the low frequency side is determined from the equation:

fc =..

1

(Hz)

2 ¥ p ¥ C1 ¥ (R1 + 20k)

• Voltage gain AV1 is determined from the equation:

AV1 =..

100k

R1 + 20k

(V/V)

2. Gain Adjustment Using Feedback Resistance (This approach has the advantage over

the above approach (less noise approach), but the number of components is increased)

Standby

Select

Input

Standby

Input

Audio

Input

C1 R1

SEL

VCC

SP

STBY

AIN

VR

GND

SP

+

C2

–

Speaker

R2

• Cutoff frequency fc on the low frequency side is determined from the equation:

fc =..

1

2 ¥ p ¥ C1 ¥ Zin

(Hz)

Zin =.. R1 + R2 ¥ 20k (W)

R2 + 120k

• Voltage gain AV1 is determined from the equation:

AV1 =..

1+

5

R1

+

20k

6 ¥ R1

R2

(V/V)

6/13

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