SANYO LC75371M Datasheet

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.

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.

Features

• Built-in buffer amplifiers allow applications to be
implemented with few external components.

•A VDD/2 reference voltage generation circuit is provided
on chip.

Package Dimensions

unit: mm

3204-MFP36S

CMOS LSI

53096HA (OT) No. 5348-1/17

SANYO: MFP36S

[LC75371M]

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

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

Car Stereo Electronic Tone

and Volume Control

LC75371M

Ordering number : EN5348

• 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.

No. 5348-2/17

LC75371M

Specifications

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

Allowable Operating Ranges at Ta = 25°C, VSS= 0 V

Parameter Symbol Conditions Ratings Unit

Maximum supply voltage V

DD

max V

DD

12 V

Maximum input voltage V

IN

max CL, DI, CE, LIN, RIN, LFIN, RFIN, L1 to L3, R1 to R3 VSS– 0.3 to VDD+ 0.3 V
Allowable power dissipation Pd max Ta ≤ 85°C 230 mW
Operating temperature Topr –40 to +85 °C
Storage temperature Tstg –50 to +125 °C

Parameter Symbol Conditions min typ max Unit

Supply voltage V

DD

V

DD

6.0 11.0 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 voltage amplitude V

IN

CL, DI, CE, LIN, RIN, LFIN, RFIN, L1 to L3, R1 to R3 V

SS

V

DD

Vp-p

Input pulse width t

øW

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

No. 5348-3/17

LC75371M

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

Parameter Symbol Conditions min typ max Unit
[Input Block]
Input resistance Rin L1 to L3, R1 to R3 30 50 70 kΩ
Minimum input gain Gin min –2 0 +2 dB
Maximum input gain Gin max +16.0 +18.0 +20.0 dB
Step resolution Gstep +6.0 dB
[Volume Control Block]

Input resistance

Rv10 LIN, RIN: 10-dB steps, loudness off 30 50 70 kΩ

Rv1 1-dB steps 6 10 14 kΩ

Step resolution ATstep 1 dB

Step error ATerr

step = 0 to –20 dB –1 0 +1 dB

step = –20 to –50 dB –3 0 +3 dB
[Fader Block]
Input resistance Rfed LFIN, RFIN 12 20 28 kΩ

step = 0 to –20 dB 2 dB
Step resolution ATstep step = –20 to –25 dB 5 dB

step = –25 to –45 dB 10 dB

Step error ATerr

step = 0 to –45 dB –2 0 +2 dB

step = –45 dB –3 0 +3 dB
Output load resistance R

L

LFOUT, LROUT, RFOUT, RROUT 20 kΩ
[Bass and Treble Control Block]
Bass control range Gbass Max. boost/cut ±9 ±10.5 ±12 dB
Treble control range Gtre Max. boost/cut ±8 ±10.5 ±13 dB
[Overall Characteristics]

Total harmonic distortion

THD1 V

IN

= 1 Vrms, f = 1 kHz, all settings flat overall 0.045 %

THD2 V

IN

= 1 Vrms, f = 20 kHz, all settings flat overall 0.045 %

Crosstalk CT

V

IN

= 1 Vrms, f = 1 kHz, all settings flat overall,

70 dB

Rg = 1 kΩ

V

IN

= 1 Vrms, f = 1 kHz, main volume control at –∞ –76 dB

Output at maximum attenuation V

O

min

V

IN

= 1 Vrms, f = 1 kHz, main volume control at –∞,

–80 dB

INMUTE

Output noise voltage

V

N

1 All settings flat overall (IHF-A), Rg = 1 kΩ 12 30 µV

V

N

2 All settings flat overall (DIN-AUDIO), Rg = 1 kΩ 16 40 µV

Current drain I

DD

VDD– VSS= 11 V 19 22.8 mA
Input high-level current I

IH

CL, DI, CE: VIN= 9 V 10 µA
Input low-level current I

IL

CL, DI, CE: VIN= 0 V –10 µA
Maximum input level V

CL

THD = 1%, RL= 20 kΩ, all tsettings flat overall,

2 Vrms

test point = fader output.

No. 5348-4/17

LC75371M

Equivalent Circuit Block Diagram and Sample Application Circuit

No. 5348-5/17

LC75371M

Test Circuits

1. Total harmonic distortion

2. Output noise voltage

No. 5348-6/17

LC75371M

3. Crosstalk

Pin Assignment