LV1115 Datasheet, PDF (11/15 Pages) Sanyo Semicon Device – Surround Processor ICs for Electronic Volume Control

LV1115/1115M
Treble / Bass Band Block Equivalent Circuit Diagram
From L-Input Block
+
-
SW2
SW1
0dB
±2dB
±4dB
±6dB
±8dB
±10dB
±12dB
±14dB
±16dB
±18dB
SW3
SW4
R1=10.633kΩ
R2=8.446kΩ
R3=6.709kΩ
R4=5.329kΩ
R5=4.233kΩ
R6=3.363kΩ
R7=2.671kΩ
R8=2.122kΩ
R9=1.665kΩ
R10=6.510kΩ
+
-
SW2
SW1
Total=51.7kΩ
0dB
±2dB
±4dB
±6dB
±8dB
±10dB
±12dB
±14dB
±16dB
±18dB
±20dB
R12=100Ω
SW3
To L-OUT Block
SW4
R1=15.220kΩ
R2=12.089kΩ
R3=9.603kΩ
R4=7.628kΩ
R5=6.059kΩ
R6=4.813kΩ
R7=3.823kΩ
R8=3.037kΩ
R9=2.412kΩ
R10=1.916kΩ
R11=100Ω
Total=66.7kΩ
L-TC1
L-BC2
L-BC1
During boost, SW1 and SW3 are ON, during cut, SW2 and SW4 are ON, when 0dB, 0dBSW and SW2 and SW3 are ON.
Tone Circuit Constant Calculation Examples
Treble Band Circuit: The shelving characteristics can be obtained for the treble band.
The equivalent circuit and calculation formula during boost are indicated below.
• Calculation example 1: Specification
Set frequency: f = 24000Hz
Gain during maximum boost: G_+18dB = 17.5dB
Let us use R1 = 6.51kΩ and R2 = 45.19kΩ
The above constants are inserted in the following formula
G = 20 × Log₁₀ 1+
R2
R1²+(1/ ω C)²
+
-
R2
R1
C
1
C=
2πf
R2
2
-R1²
10^G/20-1
1
=
2π24000
45190
2
- 6510²
≈2700 (pF)
7.50 - 1
No.8263-11/15