LC75366 데이터 시트보기 (PDF) - SANYO -> Panasonic

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LC75366

Two-Channel Electronic Volume Control

SANYO -> Panasonic 

LC75366, 75366M

Loudness Function External Circuit Constant Calculation Example

First, refer to the LC75366 and LC75366M 10 dB step internal equivalent circuit shown on page 5. Figure 1 below

shows this circuit simplified with the external components used for the loudness function connected for this calculation.

The sample calculation below uses this diagram to acquire a 5 dB boost at f = 100 Hz.

(f = 100 Hz, 5 dB boost)

Let R and C in Figure 1 be:

R1 = R2 = 10 kΩ

R3 = 1 kΩ

C1 = Z1, C2 = Z2

Then:

R2 (R3 + Z2)

VOUT =

(at = 1 kHz)

R2 + R3 + Z2

R1 · Z1

R1 + Z1

+

R2 (R3 + Z2)

R2 + R3 + Z2

= –20 dB

R2 (R3 + 10 · Z2)

VOUT =

(at = 100 Hz)

R2 + R3 + 10 · Z2

R1 · 10 · Z1 R2 (R3 + 10 · Z2)

R1 + 10 · Z1 + R2 + R3 + 10 · Z2

= –15 dB

Solving the above equations gives:

Z1 ≠ 178.3 kΩ and Z2 = 176 Ω

No. 4929-10/11

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