SANYO LC75421M Datasheet

Ordering number : ENN6866A

90503TN (OT) / 20901RM (OT) No. 6866-1/24

Overview

The LC75421M is an electronic volume controller that
enables control of volume, balance, fader, bass/treble +
super bass, input switching, and input and output level
control functions using only a small number of external
components.

Functions

• Volume:

0 dB to –79 dB in 1-dB steps, and –∞ (81 positions)
Balance function with separate L/R control

• Fader: rear output or front output can be attenuated
across 16 positions (in 2-dB steps from 0 dB to ­20 dB, 5-dB steps from –20 dB to –25 dB, 10-dB
steps from –25 dB to –45 dB, and –60 dB, –∞)

• Bass/treble: A tone control circuit can be configured

using an external RC, with 15-position
control from 0 dB to ±11.9 dB in 1.7-dB
steps possible for both bass and treble

• Input gain: 0 dB to +18.75 dB (1.25-dB steps)

amplification is possible for the input signal.

• Output gain: Fader output can be selected among 0 dB,

+6.5 dB, and +8.5 dB.

• Input switching: Five input signals can be selected for

Left and for Right

• Super bass: Step control with 11 positions is possible,

with peaking characteristics (type T)

Features

• On-chip buffer amplifier cuts down number of external
components

• Low switching noise generated by on-chip switch due to
use of silicon gate CMOS process

• On-chip reference voltage circuit for analog ground

• Controls performed with serial input (CCB)

Package Dimensions

unit: mm

3263-MFP36SDJ (375 mil)

1

18

36 19

0.8

15.2

0.3

0.65

10.5

7.9

0.25

(0.8)

2.45max

0.1

(2.25)

SANYO: MFP36SDJ (375 mil)

[LC75421M]

LC75421M

SANYO Electric Co.,Ltd. Semiconductor Company

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN

Electronic Volume Controller for Cars

CMOS IC

Any and all SANYO products described or contained herein do not have specifications that can handle
applications that require extremely high levels of reliability, such as life-support systems, aircraft’s
control systems, or other applications whose failure can be reasonably expected to result in serious
physical and/or material damage. Consult with your SANYO representative nearest you before using
any SANYO products described or contained herein in such applications.

SANYO assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other
parameters) listed in products specifications of any and all SANYO products described or contained
herein.

• 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.

Pin Assignment

No. 6866-2/24

LC75421M

LC75421M

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15
16
17
18

36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19

DI

CE

VSS

LROUT

LFOUT

LFIN

LOUT

LSB
LBASS2
LBASS1

LTRE

LIN

LSELO

L5
L4
L3
L2
L1

CL
VDD
RROUT
RFOUT
RFIN
ROUT
RSB
RBASS2
RBASS1
RTRE
RIN
RSELO
R5
R4
R3
R2
R1
Vref

Top view

No. 6866-3/24

LC75421M

Equivalent Circuit Block Diagram

2.2 µF

2.2 µF

µCOM

2.2 µF

VDD

VSS

CE

DI

CL

2.2 µF

PA

PA

PA

PA

LROUT

4

3 2 1 36 35

RROUT

RFOUT

RFIN

ROUT

1 µF

1 µF

0.15 µF

0.15 µF

3.7 kΩ

RSB
RBASS2

34

33

32

31

30

0.082 µF

0.082 µF

7.68 kΩ

1500 pF

RBASS1

Control

circuit

RVref

LVref

Control

circuit

CCB

interface

Control

circuit

RTRE

RIN

RSELO

29

28

27

25

26

5

6

7

8

9

10

11

12

13

14

1 µF

L5

1 µFL41 µFL31 µFL21 µF

L1

22 µF

Vref

1 µFR11 µF

R2

1 µFR31 µF

R4

1 µF

R5

15 16 17 18 19 20 21 22 23 24

LFOUT

LFIN

LSB

LBASS2

LBASS1

LTRE

LIN

LSELO

0.15 µF

1500 pF

1 µF

0.15 µF

0.082 µF

0.082 µF

1 µF

LOUT

3.7 kΩ

7.68 kΩ

[TREBLE f0 10 kHz] [BASS f0 100 Hz] [S-BASS f0 68 Hz]

No. 6866-4/24

LC75421M

Parameter Symbol Conditions Ratings Unit

Maximum supply voltage V

DD

max V

DD

11 V

Maximum input voltage V

IN

max

CE, DI, CL –0.3 to 11

V

Input pins other than CE, DI, CL V

SS

– 0.3 to VDD+ 0.3
Allowable power dissipation Pdmax Ta ≤ 85°C, when mounted on board 550 mW
Operating temperature Topr –40 to +85 °C
Storage temperature Tstg –50 to +125 °C

Specifications

Absolute Maximum Ratings at Ta = 25°C, VSS= 0 V

Parameter Symbol Pin Name Conditions

Ratings

Unit

min typ max

Supply voltage V

DDVDD

7.5 10 V

Input high-level voltage V

IH

CL, DI, CE 4.0 10 V

Input low-level voltage V

IL

CL, DI, CE V

SS

1.0 V

CL, DI, CE, LIN, RIN,

Input amplitude voltage V

IN

L1 to L5, R1 to R5, V

SS

V

DD

Vp-p

LFIN, RFIN
Input pulse width tøW CL 1 µs
Setup time tsetup CL, DI, CE 1 µs
Hold time thold CL, DI, CE 1 µs
Operating frequency fopg CL 500 kHz

Allowable Operating Ranges at Ta = –40 to +85°C, VSS= 0 V

Parameter Symbol Pin Name Conditions

Ratings

Unit

min typ max
Maximum input gain Ginmax +18.75 dB
Step resolution Gstep +1.25 dB

Input resistance Rin

L1, L2, L3, L4, L5

50 kΩ

R1, R2, R3, R4, R5
Clipping level Vcl LSELO, RSELO THD = 1.0%, f = 1 kHz 2.90 Vrms
Output load resistance RL LSELO, RSELO 10 kΩ

Electrical Characteristics at Ta = 25°C, VDD= 8 V, VSS= 0 V

Parameter Symbol Pin Name Conditions

Ratings

Unit

min typ max

Input resistance Rin LIN, RIN 50 kΩ

Volume Block

Parameter Symbol Pin Name Conditions

Ratings

Unit

min typ max

STEP = 0 dB to –20 dB 2

Step resolution ATstep STEP = –20 dB to –25 dB 5 dB

STEP = –25 dB to –45 dB 10

Step error ATerr

STEP = 0 dB to –45 dB –2 0 +2

dB

STEP = –45 dB to –60 dB –3 0 +3

Output load resistance RL 10 kΩ
Output impedance R

O

LFOUT, LROUT RL = 10 kΩ, f = 1 kHz

46 Ω

RFOUT, RROUT V

IN

= 1 Vrms

Fader Volume Block

No. 6866-5/24

LC75421M

Parameter Symbol Pin Name Conditions

Ratings

Unit

min typ max
Control range Gbass MAX. Boost/Cut ±10 ±11.9 ±14 dB
Step resolution Estep 1 1.7 3 dB
Internal feedback resistance Rfeed 45.084 kΩ

Bass Band Control Block

Parameter Symbol Pin Name Conditions

Ratings

Unit

min typ max
Control range Gtre MAX. Boost/Cut ±10 ±11.9 ±14 dB
Step resolution Estep 1 1.7 3 dB
Internal feedback resistance Rfeed 56.084 kΩ

Treble Band Control Block

Parameter Symbol Pin Name Conditions

Ratings

Unit

min typ max
Control range Crange MAX. Boost +20 dB
Step resolution Estep +2.0 dB
Internal feedback resistance Rfeed 66.6 kΩ

Super Bass Block (Type T)

Parameter Symbol Conditions

Ratings

Unit

min typ max
Total harmonic distortion THD V

IN

= 1 Vrms, f = 1 kHz, flat overall 0.003 0.01 %

Crosstalk CT V

IN

= 1 Vrms, f = 1 kHz, flat overall, Rg = 1 kΩ 80.5 dB

Maximum attenuated output Vomin V

IN

= 1 Vrms, f = 1 kHz, main volume –∞ –80 dB

Output noise voltage

VN-1 Fflat overall, (IHF-A), RG = 1 kΩ 8 µV
VN-2 Flat overall, (DIN-AUDIO), RG = 1 kΩ 10 µV

Input high-level current I

IH

CL, DI, CE VIN= 8 V 10 µA

Input low-level current I

IL

CL, DI, CE VIN= 0 V –10 µA

General

Control Timing and Data Format

To control the LC75421M, input specified serial data to the CE, CL, and DI pins.
The data configuration consists of a total of 52 bits broken down into 8 address bits and 44 data bits.

No. 6866-6/24

LC75421M

CE

B0 B1 B2 B3 A0 A1 A2 A3

1 µs

min

1 µs

min

1 µs

min

1 µs ≤ T

DEST

B
0

D0D1D2D3D4D5D6D7D8D9D10D11D12D13D14D15D16D17D18D19D20D21D22D

23

0
1

0
1

D24D25D26D27D28D29D30D31D32D33D34D35D36D37D38D39D40D41D42D

43

B1B2B3A0A1A2A

3

1 0 0 0 0 0 0 1

1 µs

min

1 µs

min

D0 D1 D2 D3 D4 D5

D38 D39 D40 D41 D42 D43

DI

DI

Super bass control

Treble control

Boost

Boost

Caution: Be sure to set D36 to D38 and D40 to D43

to “0” for the TEST bit of the IC.

CL

CL

CE

Address code

Fader step control

0 0 0 0
1 0 0 0
0 1 0 0
1 1 0 0
0 0 1 0
1 0 1 0
0 1 1 0
1 1 1 0
0 0 0 1
1 0 0 1
0 1 0 1
1 1 0 1
0 0 1 1
1 0 1 1
0 1 1 1
1 1 1 1

–∞ dB
–60 dB
–45 dB
–35 dB
–25 dB
–20 dB
–18 dB
–16 dB
–14 dB
–12 dB
–10 dB

–8 dB
–6 dB
–4 dB
–2 dB

0 dB

0 0 0 0
1 0 0 0
0 1 0 0
1 1 0 0
0 0 1 0
1 0 1 0
0 1 1 0
1 1 1 0
0 0 0 1
1 0 0 1
0 1 0 1
1 1 0 1
0 0 1 1
1 0 1 1
0 1 1 1
1 1 1 1

0 dB
+1.25 dB
+2.50 dB
+3.75 dB
+5.00 dB
+6.25 dB
+7.50 dB
+8.75 dB

+10.00 dB
+11.25 dB
+12.50 dB
+13.75 dB
+15.00 dB
+16.25 dB
+17.50 dB
+18.75 dB

0 0
0 1
1 0
1 1

0 0
1 0
0 1
1 1

0 dB

0 dB
+6.5 dB
+8.5 dB

1 1 1 0
0 1 1 0
1 0 1 0
0 0 1 0
1 1 0 0
0 1 0 0
1 0 0 0
0 0 0 0
1 0 0 1
0 1 0 1
1 1 0 1
0 0 1 1
1 0 1 1
0 1 1 1
1 1 1 1

STEP15
STEP14
STEP13
STEP12
STEP11
STEP10
STEP9
STEP8
STEP7
STEP6
STEP5
STEP4
STEP3
STEP2
STEP1
Cut

1 1 1 0
0 1 1 0
1 0 1 0
0 0 1 0
1 1 0 0
0 1 0 0
1 0 0 0
0 0 0 0
1 0 0 1
0 1 0 1
1 1 0 1
0 0 1 1
1 0 1 1
0 1 1 1
1 1 1 1

STEP15
STEP14
STEP13
STEP12
STEP11
STEP10
STEP9
STEP8
STEP7
STEP6
STEP5
STEP4
STEP3
STEP2
STEP1
Cut

0 0 0 0
1 0 0 0
0 1 0 0
1 1 0 0
0 0 1 0
1 0 1 0
0 1 1 0
1 1 1 0
0 0 0 1
1 0 0 1
0 1 0 1

STEP0(FLAT)
STEP1
STEP2
STEP3
STEP4
STEP5
STEP6
STEP7
STEP8
STEP9
STEP10

(BOOST max)

Bass control

Volume control

Fader
rear/front
control

Rear
Front

OFF

ON

TEST mode

Input switch control (1) Input switch control (2)

Input mute
switch control

Input gain control

Channel selection

Initial setting
Lch
Rch
L/R simultaneous

Output gain control

No. 6866-7/24

LC75421M

Volume Control

D16 D17 D18 D19 D20 D21 D22 D23 Operation

0 0 1 0 0 1 0 1 0dB
1 1 0 0 0 1 0 1 –1dB
0 1 0 0 0 1 0 1 –2dB
1 0 0 0 0 1 0 1 –3dB
0 0 1 1 1 0 0 1 –4dB
1 1 0 1 1 0 0 1 –5dB
0 1 0 1 1 0 0 1 –6dB
1 0 0 1 1 0 0 1 –7dB
0 0 1 0 1 0 0 1 –8dB
1 1 0 0 1 0 0 1 –9dB

0 1 0 0 1 0 0 1 –10dB
1 0 0 0 1 0 0 1 –11dB
0 0 1 1 0 0 0 1 –12dB
1 1 0 1 0 0 0 1 –13dB
0 1 0 1 0 0 0 1 –14dB
1 0 0 1 0 0 0 1 –15dB
0 0 1 0 0 0 0 1 –16dB
1 1 0 0 0 0 0 1 –17dB
0 1 0 0 0 0 0 1 –18dB
1 0 0 0 0 0 0 1 –19dB
0 0 1 1 1 1 1 0 –20dB
1 1 0 1 1 1 1 0 –21dB
0 1 0 1 1 1 1 0 –22dB
1 0 0 1 1 1 1 0 –23dB
0 0 1 0 1 1 1 0 –24dB
1 1 0 0 1 1 1 0 –25dB
0 1 0 0 1 1 1 0 –26dB
1 0 0 0 1 1 1 0 –27dB
0 0 1 1 0 1 1 0 –28dB
1 1 0 1 0 1 1 0 –29dB
0 1 0 1 0 1 1 0 –30dB
1 0 0 1 0 1 1 0 –31dB
0 0 1 0 0 1 1 0 –32dB
1 1 0 0 0 1 1 0 –33dB
0 1 0 0 0 1 1 0 –34dB
1 0 0 0 0 1 1 0 –35dB
0 0 1 1 1 0 1 0 –36dB
1 1 0 1 1 0 1 0 –37dB
0 1 0 1 1 0 1 0 –38dB
1 0 0 1 1 0 1 0 –39dB
0 0 1 0 1 0 1 0 –40dB
1 1 0 0 1 0 1 0 –41dB
0 1 0 0 1 0 1 0 –42dB
1 0 0 0 1 0 1 0 –43dB
0 0 1 1 0 0 1 0 –44dB
1 1 0 1 0 0 1 0 –45dB
0 1 0 1 0 0 1 0 –46dB
1 0 0 1 0 0 1 0 –47dB
0 0 1 0 0 0 1 0 –48dB
1 1 0 0 0 0 1 0 –49dB
0 1 0 0 0 0 1 0 –50dB

Continued on next page.

No. 6866-8/24

LC75421M

Continued from preceding page.

D16 D17 D18 D19 D20 D21 D22 D23 Operation

1 0 0 0 0 0 1 0 –51dB
0 0 1 1 1 1 0 0 –52dB
1 1 0 1 1 1 0 0 –53dB
0 1 0 1 1 1 0 0 –54dB
1 0 0 1 1 1 0 0 –55dB
0 0 1 0 1 1 0 0 –56dB

1 1 0 0 1 1 0 0 –57dB
0 1 0 0 1 1 0 0 –58dB
1 0 0 0 1 1 0 0 –59dB
0 0 1 1 0 1 0 0 –60dB
1 1 0 1 0 1 0 0 –61dB
0 1 0 1 0 1 0 0 –62dB
1 0 0 1 0 1 0 0 –63dB
0 0 1 0 0 1 0 0 –64dB
1 1 0 0 0 1 0 0 –65dB
0 1 0 0 0 1 0 0 –66dB
1 0 0 0 0 1 0 0 –67dB
0 0 1 1 1 0 0 0 –68dB
1 1 0 1 1 0 0 0 –69dB
0 1 0 1 1 0 0 0 –70dB
1 0 0 1 1 0 0 0 –71dB
0 0 1 0 1 0 0 0 –72dB
1 1 0 0 1 0 0 0 –73dB
0 1 0 0 1 0 0 0 –74dB
1 0 0 0 1 0 0 0 –75dB
0 0 1 1 0 0 0 0 –76dB
1 1 0 1 0 0 0 0 –77dB
0 1 0 1 0 0 0 0 –78dB
1 0 0 1 0 0 0 0 –79dB
0 0 0 0 0 0 0 0 –∞dB

Input Switch Control (L1, L2, L3, L4, L5, R1, R2, R3, R4, R5)

D28 D29 D32 Operation

0 0 1 L1 (R1) ON
1 0 1 L2 (R2) ON
0 1 1 L3 (R3) ON
1 1 1 L4 (R4) ON
0 0 0 L5 (R5) ON