Ordering number : EN5348
CMOS LSI
LC75371M
Car Stereo Electronic Tone
and Volume Control
Overview
The LC75371M is an electronic tone/volume control LSI
that can implement, with minimal external components,
volume, balance, fader, bass and treble, loudness, input
switching, and input level controls.
Package Dimensions
unit: mm
3204-MFP36S
[LC75371M]
Functions
• Volume control: From 0 to –79 dB in 1-dB steps plus
–∞ for a total of 81 settings. Since the left and right
levels can be set independently, this function can also be
used to implement a balance function.
• Fader: Attenuates either the rear or front channels to
one of 16 levels. (Provides 16 settings, namely, from 0
to –20 dB in 2-dB steps, from –20 to –25 dB in one
5-dB step, from –25 to –45 dB in 10-dB steps, –60 dB,
and –∞.)
• Bass and treble controls: Forms an NF-type tone control
circuit (LUX type) using external capacitors. Provides
15 settings each for the bass and treble controls.
• Loudness control: A loudness function can be
implemented by attaching external RC circuits at the
taps provided from the volume control resistor ladder
starting at the –20-dB position.
• The input signal can be selected from one of three inputs
for each of the left and right channels. The input signal
can be amplified by between 0 and +18 dB in 6-dB steps.
• Serial data input: Supports CCB* format communication
with the system controller.
SANYO: MFP36S
Features
• Built-in buffer amplifiers allow applications to be
implemented with few external components.
• A V
DD
/2 reference voltage generation circuit is provided
on chip.
• CCB is a trademark of SANYO ELECTRIC CO., LTD.
• CCB is SANYO’s original bus format and all the bus
addresses are controlled by SANYO.
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
53096HA (OT) No. 5348-1/17
LC75371M
Specifications
Absolute Maximum Ratings
at Ta = 25°C, V
SS
= 0 V
Parameter
Maximum supply voltage
Maximum input voltage
Allowable power dissipation
Operating temperature
Storage temperature
Symbol
V
DD
max
V
IN
max
Pd max
Topr
Tstg
V
DD
CL, DI, CE, LIN, RIN, LFIN, RFIN, L1 to L3, R1 to R3
Ta
≤
85°C
Conditions
Ratings
12
V
SS
– 0.3 to V
DD
+ 0.3
230
–40 to +85
–50 to +125
Unit
V
V
mW
°C
°C
Allowable Operating Ranges
at Ta = 25°C, V
SS
= 0 V
Parameter
Supply voltage
Input high-level voltage
Input low-level voltage
Input voltage amplitude
Input pulse width
Setup time
Hold time
Operating frequency
Symbol
V
DD
V
IH
V
IL
V
IN
t
øW
tsetup
thold
fopg
V
DD
CL, DI, CE
CL, DI, CE
CL, DI, CE, LIN, RIN, LFIN, RFIN, L1 to L3, R1 to R3
CL
CL, DI, CE
CL, DI, CE
CL
Conditions
min
6.0
4.0
V
SS
V
SS
1
1
1
500
typ
max
11.0
V
DD
1.0
V
DD
Unit
V
V
V
Vp-p
µs
µs
µs
kHz
No. 5348-2/17
LC75371M
Electrical Characteristics
at Ta = 25°C, V
DD
= 9 V, V
SS
= 0 V
Parameter
[Input Block]
Input resistance
Minimum input gain
Maximum input gain
Step resolution
[Volume Control Block]
Input resistance
Step resolution
Step error
[Fader Block]
Input resistance
Rfed
LFIN, RFIN
step = 0 to –20 dB
Step resolution
ATstep
step = –20 to –25 dB
step = –25 to –45 dB
Step error
Output load resistance
[Bass and Treble Control Block]
Bass control range
Treble control range
[Overall Characteristics]
Total harmonic distortion
THD1
THD2
CT
V
IN
= 1 Vrms, f = 1 kHz, all settings flat overall
V
IN
= 1 Vrms, f = 20 kHz, all settings flat overall
V
IN
= 1 Vrms, f = 1 kHz, all settings flat overall,
Rg = 1 kΩ
V
IN
= 1 Vrms, f = 1 kHz, main volume control at –∞
Output at maximum attenuation
V
O
min
V
N
1
V
N
2
I
DD
I
IH
I
IL
V
CL
V
IN
= 1 Vrms, f = 1 kHz, main volume control at –∞,
INMUTE
All settings flat overall (IHF-A), Rg = 1 kΩ
All settings flat overall (DIN-AUDIO), Rg = 1 kΩ
V
DD
– V
SS
= 11 V
CL, DI, CE: V
IN
= 9 V
CL, DI, CE: V
IN
= 0 V
THD = 1%, R
L
= 20 kΩ, all tsettings flat overall,
test point = fader output.
–10
2
0.045
0.045
70
–76
–80
12
16
19
30
40
22.8
10
%
%
dB
dB
dB
µV
µV
mA
µA
µA
Vrms
Gbass
Gtre
Max. boost/cut
Max. boost/cut
±9
±8
±10.5
±10.5
±12
±13
dB
dB
ATerr
R
L
step = 0 to –45 dB
step = –45 dB
LFOUT, LROUT, RFOUT, RROUT
–2
–3
20
12
20
2
5
10
0
0
+2
+3
28
kΩ
dB
dB
dB
dB
dB
kΩ
Rv10
Rv1
ATstep
ATerr
step = 0 to –20 dB
step = –20 to –50 dB
–1
–3
LIN, RIN: 10-dB steps, loudness off
1-dB steps
30
6
50
10
1
0
0
+1
+3
70
14
kΩ
kΩ
dB
dB
dB
Rin
Gin min
Gin max
Gstep
L1 to L3, R1 to R3
30
–2
+16.0
50
0
+18.0
+6.0
70
+2
+20.0
kΩ
dB
dB
dB
Symbol
Conditions
min
typ
max
Unit
Crosstalk
Output noise voltage
Current drain
Input high-level current
Input low-level current
Maximum input level
No. 5348-3/17
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