LV1115 查看數據表（PDF） - SANYO -> Panasonic

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LV1115

Bi-CMOS IC Surround Processor ICs for Electronic Volume Control

SANYO -> Panasonic 

LV1115/1115M

Bass Band Circuit: The equivalent circuit and the formula for calculating the external RC with a mean frequency of

100Hz are shown below.

• Calculation example 1: specification

Mean frequency: f0 = 100Hz

Gain during maximum boost: G+20dB = 20dB

Let us use R1 = 0kΩ and R2 = 66.7kΩ, and C1 = C2 = C.

+

-

R1

R2

We obtain R2 from G = 20dB

C1

C2

R2

G = 20 × Log10 1+

2R3

R3

R2

R3 = 2 (10G+20dB/20 - 1) =

66700

2 (10 - 1)

≈3.6kΩ

We obtain C from mean frequency f0 = 100Hz

1

f0 =

2π (R3R2C1C2)

1

C = 2πf0 R3R2 =

1

2π × 100 66700 × 3600

≈0.1μF

We obtain Q

R3R2

Q = 2R3

1

×

≈2.15

R3R2

Note item when using

(1) When turning on the power, the setting inside is unsettled. Before setting control data, it does a mute.

(2) To prevent the digital noise of the high frequency influence a terminal (SCL, SDA).

It can be protected by a signal line in the ground pattern or by the shielding cable.

(3) To prevent the noise in changing a mode, please set the mute ON.

Sample Application Circuit

No.8263-12/15

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