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Electronic Volume and Tone Control IC for
Electronic Volume and Tone Control IC for
Car Audio Systems
Car Audio Systems
LC75411E/W
LC75411E/W
Overview
The LC75411E/W is an electronic volume and tone control IC that implements a rich set of audio control
functions with a minimal number of external components. Functions include volume, balance, fader,
bass/treble, and loudness controls, as well as input selection/switching functions and an input gain control.
Functions
Volume control: A total of 161 positions from 0 dB to -79.5 dB in 0.5 dB steps and - dB. A balance function can be
implemented by controlling the left and right channel volume controls separately.
Fader control: The rear or front outputs can be attenuated by one of 16 levels
(A total of 16 settings with attenuations of 0 to -2 dB in 1 dB steps, -2 to -20 dB in 2 dB steps, -20 to -30 dB in
10 dB steps, and -45, -60, and - dB settings.)
Bass/treble controls: Each band can be controlled in 1 dB steps from 0 dB to 6 dB, and in 2 dB steps from 8 dB to 12 dB
Input gain control: The input signal can be amplified by 0 to +18.75 dB in 1.25 dB steps
Input switching: One of 4 input systems (left and right channels) can be selected
Loudness control: The -32 dB position of the 2 dB step volume control ladder resistor can be tapped and a loudness function
implemented with external capacitor and resistor components
Features
On-chip buffer amplifiers reduce the number of external components
Internal switches are implemented in a silicon gate CMOS process that minimizes the noise generated when switching.
This results in low noise even when switching in the no-signal state
Zero-cross switching circuits used for low noise even when input signals are present
Built-in VDD/2 reference voltage generation circuit
All functions are controlled using serial data (CCB)
Packages: LC75411E: QIP44M (10
10 mm)
LC75411W: SQFP48 (7
7 mm)
Block Diagram
4.7k
0.1 F
220pF
10 F
+
1 F
+
+
-
1 F
L4
LVref
+
+
-
L3
1 F
+
LVref
L2
1 F
+
1 F
L1
+
V DD
+
LVref
-
22 F
+
Vref
+
RVref
-
R1
+
R2
+
R3
RVref
+
R4
+
-
+
RVref
+ -
+
1 F
+
10 F
220pF
68k
4.7k
0.1 F
45 Car Audio
:CCB is SANYO's original bus format.
All bus addresses are managed by
SANYO for this format.
[BASS fo
100Hz]
[TREBLE]
10 F
0.1 F
0.1 F
2700pF
+
+
10 F
+ -
LFIN
+ -
10 F
LFOUT
+
+ -
+ -
-
+
LROUT
+
-
+
10 F
VSS
CL
ZERO-CROSS DET
Multiplexer
CL
DI
CCB
Micro
DI
INTERFACE
CONTROL
Controller
LOGIC CIRCUIT
CIRCUIT
CE
CE
V DD
TEST
Multiplexer
ZERO-CROSS DET
NO SIGNAL
TIMER
TIM
0.033 F
RROUT
+ -
+
10 F
RFOUT
+
+ -
+ -
+
-
10 F
+ -
RFIN
+ -
10 F
+
+
2700pF
10 F
0.1 F
0.1 F
[BASS fo
100Hz]
[TREBLE]
Overview
The LC75412E/W is an electronic volume and tone control IC that implements a rich set of audio control
functions with a minimal number of external components. Functions include volume, balance, fader,
bass/treble, and loudness controls, as well as input selection/switching functions and an input gain control.
Functions
Volume control: A total of 81 positions from 0 dB to -79 dB in 1 dB steps and - dB.
A balance function can be implemented by controlling the left and right channel volume controls separately.
Fader control: The rear or front outputs can be attenuated by one of 16 levels
(A total of 16 settings with attenuations of 0 to -2 dB in 1 dB steps, -2 to -20 dB in 2 dB steps, -20 to -30 dB in 10 dB steps,
and -45, -60, and - dB settings.)
Bass/treble controls: Each band can be controlled in 2 dB steps from 0 dB to 18 dB
Input gain control: The input signal can be amplified by 0 to +18.75 dB in 1.25 dB steps
Input switching: One of six input systems (left and right channels) can be selected (Five of the input systems are single-
ended inputs, one uses differential inputs.)
Loudness control: Taps are output starting at the -32 dB position of the ladder resistor and a loudness function
implemented with external capacitor and resistor components
Features
On-chip buffer amplifiers reduce the number of external components
Internal switches are implemented in a silicon gate CMOS process that minimizes the noise generated when switching.
This results in low noise even when switching in the no-signal state
Zero-cross switching circuits used for low noise even when input signals are present
Built-in VDD/2 reference voltage generation circuit
All functions are controlled using serial data (CCB)
Packages: LC75412E: QIP64E (14
Block Diagram
1 F
+
1 F
+
1 F
+
1 F
+
PA
1 F
+
PA
1 F
+
1 F
+
VDD
22 F
+
1 F
+
1 F
+
1 F
+
PA
1 F
+
PA
1 F
+
1 F
+
1 F
+
Electronic Volume and Tone Control IC for
Electronic Volume and Tone Control IC for
Car Audio Systems
Car Audio Systems
LC75412E/W
LC75412E/W
14 mm)
LC75412W: SQFP64 (10
10 mm)
0.33 F
[BASS fo 100Hz]
1000pF
1 F
+
48
47
46
45
44
43
42
41
40
39
38
37
L5P
49
L5M
50
L4
+ -
51
+
+
-
L3
LVref
+ -
52
L2
53
L1
54
L6
Multiplexer
ZERO-CROSS DET
55
+
-
LVref
56
CONTROL
LOGIC CIRCUIT
Vref
+
CIRCUIT
RVref
-
57
R6
ZERO-CROSS DET
58
Multiplexer
R1
59
R2
60
R3
+ -
61
RVref
R4
+
+
+
-
62
-
R5M
63
R5P
64
1
2
3
4
5
6
7
8
9
10
11
12
+
1 F
1000pF
10k
1k
0.33 F
[BASS fo 100Hz]
:CCB is SANYO's original bus format.
All bus addresses are managed by
SANYO for this format.
[TREBLE fo 10kHz]
+
10 F
36
35
34
33
LFIN
32
10 F
LFOUT
+ -
31
PA
+
LROUT
+ -
30
+ -
PA
+
10 F
LAVSS
29
TEST
28
DVSS
27
CL
CL
26
DI
Micro
CCB
25
DI
INTERFACE
Controller
CE
CE
24
MUTE
23
RAVSS
47k
22
NO SIGNAL
NC
21
TIMER
TIM
20
0.033 F
RROUT
+ -
+
19
PA
+
-
10 F
RFOUT
+
-
+
18
PA
10 F
RFIN
17
13
14
15
16
10 F
+
[TREBLE fo 10kHz]
46 Car Audio
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