Sanyo LC7538JM Specifications

Overview

The LC7538JM is a fully equipped electronic volume IC
which permits significant reductions in externally
connected components while providing ample volume,
balance, loudness, fader, bass and treble control functions.

Features

• Volume : 81 positions ranging from 0 dB to -79

dB (in 1 dB increments) plus -∞.
Separate left and right control provides
excellent balance function.

• Loudness : Loudness operation provided by
externally attached CR to activate tap
at the -20 dB position of the volume
ladder resistor.

• Fader : Fader function traversing 16 positions
with rear or front attenuated output
only (these 16 positions consist of 2
dB step intervals ranging from 0 dB to

-20 dB, 5 dB step intervals ranging
from -20 dB to -45 dB, plus the end
settings of -60 dB and -∞).

•

Bass and Treble

: Using externally attached C

(capacitor), the LC7538JM provides
bass-treble mutual 15-position control
and formats a NF-form tone control
circuit (LUX form).

Ordering number : EN4799B

93098 HA (OT) / 83194 TH (OT) B8-0913 No. 4799-1/14

Specifications

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

• On-chip op amplifier for caching applications reduces
external components.

• Reduced switching noise with silicon gate CMOS
processor.

• All controls performed using serial data input (CCB).

Package Dimensions

unit : mm

3204-MFP36S

Parameter Symbol Conditions Ratings Unit

Maximum supply voltage V

DD

max V

DD

11 V

V

IN

max1 CL, DI, CE VSS– 0.3 to V

DD

+ 0.3 V

Maximum input voltage

V

IN

max2

LTIN, RTIN, L5dBIN, R5dBIN, L1dBIN, R1dBIN,

VSS– 0.3 to VDD+ 0.3 V

LFIN, RFIN
Allowable power dissipation Pd max Ta ≤ 85°C 210 mW
Operating temperature Topr –40 to +85 °C
Storage temperature Tstg –50 to +125 °C

LC7538JM

Electronic Volume Control System

for Car Audio

CMOS IC

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

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

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.

SANYO: MFP36S

[LC7538JM]

LC7538JM

No. 4799-2/14

Allowable Operation Conditions at Ta = 25°C, VSS= 0 V

Note: 1. A capacitor rated at 2000 pF or less should be installed between all power supply pins and VSS.

Electrical Characteristics at Ta = 25°C, VDD= 9 V, VSS= 0 V

Parameter Symbol Conditions

Ratings

Unit

min typ max

Supply voltage V

DD

*1 7.0 10.0 V

Input high level voltage V

IH

CL, DI, CE 4.0 V

DD

V

Input low level voltage V

IL

CL, DI, CE V

SS

1.0 V

Input amplitude voltage V

IN

LTIN, RTIN, L5dBIN, R5dBIN, L1dBIN,

V

SS

V

DD

Vp-p

R1dBIN, LFIN, RFIN

Input pulse width t

øW

CL 1 µs

Setup time t

SETUP

CL, DI, CE 1 µs

Hold time t

HOLD

CL, DI, CE 1 µs

Operating Frequency fopg CL 500 kHz

Parameter Symbol Conditions

Ratings

Unit

min typ max

Total harmonic distortion

THD (1) V

IN

= 1 Vrms, f = 1 kHz, total overall flat 0.04 %

THD (2) V

IN

= 1 Vrms, f = 20 kHz, total overall flat 0.06 %

Crosstalk CT

V

IN

= 1 Vrms, f = 1 kHz,

60 87 dB

total overall flat, Rg = 1 kΩ
V

IN

= 1 Vrms, f = 1 kHz,

Maximum Output Reduction Vo min main volume –∞, fader volume –∞, 82 dB

C = 1000 µF between Vref and V

SS

for L/R

R

VOL

(1) 5 dB step 15 25 35 kΩ

R

VOL

(2) 1 dB step 12 20 28 kΩ

All Resistance Value R

FADER

12 20 28 kΩ

R

BASS

48 80 112 kΩ

R

TREBLE

30 50 70 kΩ

Input high level current I

IH

VI = 8 V (CL, CE, DI pins) 10 µA

Input low level current I

IL

VI = 0 V (CL, CE, DI pins) –10 µA

Output noise voltage V

N

All overall flat (IHF-A), Rg = 1 kΩ 7.5 15 µV

Current dissipation I

DD

VDD-VSS= 10 V 15 21 mA
CT1 1.8 3.0 4.2 kΩ
Between CT2 and Vref 0.6 1.0 1.4 kΩ

Analog switch on resistance R

ON

Fader S1 to S4 1.8 3.0 4.2 kΩ
–∞ 0.6 1.0 1.4 kΩ
All other cases 6.0 10.0 14.0 kΩ

LC7538JM

No. 4799-3/14

Equivalent Circuit Block Diagram

Test Circuit

a) Total Harmonic Distortion

LC7538JM

No. 4799-4/14

b) Output Noise Voltage

c) Crosstalk

Pin Assignment

LC7538JM

No. 4799-5/14

Pin Descriptions

Pin name Pin No. Description Remarks
LROUT 1
LFOUT 2
RROUT 36
RFOUT 35

LFIN 3

RFIN 34

LVref 4

RVref 33

L1dBOUT 5

R1dBOUT 32

L1dBIN 6

R1dBIN 31

L5dBOUT 7

R5dBOUT 30

LCT1 9
LCT2 8
RCT1 28
RCT2 29

L5dBIN 10

R5dBIN 27

LTOUT 11

RTOUT 26

•

These pins function as output pins for the fader. Output reduction for rear and
front is performed separately for each. Attenuation capacity is unified for
both left and right. Step positioning is designed using an open circuit so that
reception is performed using high impedance

.

• When utilizing the fader function, these pins function as input pins.

• Low impedance driven.

• These pins are common pins for fader volume, tone and main volume.
The pattern impedance connected here should be lowered as much as
possible.

• LVref and RVref are not connected to V

SS

.

• Connections for LVref and RVref to V

SS

should be established externally to
match all specifications. Notably, attention should be paid to capacity since
capacitors are subject to residual resistance during volume output reduction
when installed between LVref (RVref) and V

SS

as is the case with single

power sources.

• Normally, high voltage applied from VDD.

• These pins are output pins for the 1 dB step attenuator located in the section
main volume.

• These pins are input pins for the 1 dB step attenuator located in the section
main volume.

• Low impedance driven.

• These pins are output pins for the 5 dB step attenuator located in the section
main volume.

• These pins are for loudness control. Connect a high-band compensation
capacitor between CT1 to 5dB IN and a low-band compensation capacitor
between CT2 to Vref.

• These pins are input pins for the 5 dB step attenuator located in the section
main volume.

• Low impedance driven.

• These pins are output pins for tone control.

Continued on next page.