SANYO LA4168M Datasheet

Overview

The LA4168M is a record/playback system IC for
microcassette and compact cassette recorders. The
LA4168M is an extremely high-functionality IC that
includes a motor control governor circuit, a voice sensor
circuit that detects sounds and turns motor on or off, a
power switch control circuit that receives an electrical
signal from a photosensor and turns all of the IC function
blocks on or off, and a circuit that increases the speed of
the motor during playback.

Functions

• Microphone and playback preamplifiers

• Record amplifier

• Power amplifier (BTL, 4 Ω)

• Automatic stop circuit (power switch)

• Governor circuit

• Motor speed and high-speed switching circuit

• Microphone power supply

• LED drive circuit

• Voice sensor circuit

Features

• Includes a voice switch that can turn the governor on or
off.

• Includes a power switch circuit that can turn all the IC
function blocks on or off from a photosensor signal.
During record, the IC can automatically turn the
governor on or off according to the microphone input
level, and furthermore, the governor on/off level can be
continuously adjusted from an external control knob.
(The control used for volume adjustment during
playback.)

• Continuously variable microphone monitor level.

• Includes a drive pin for an LED that lights only when
the governor is on in record mode.

Monolithic Linear IC

Ordering number : EN5660

73097HA(OT) No. 5660-1/6

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

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

Record/Playback System for Microcassette and

Compact Cassette Recorders

LA4168M

Parameter Symbol Conditions Ratings Unit

Maximum supply voltage V

CC

max 4.5 V
Allowable power dissipation Pd max 800 mW
Operating temperature Topr –10 to +50 °C
Storage temperature Tstg –55 to +150 °C

Specifications

Maximum Ratings at Ta = 25°C

Parameter Symbol Conditions Ratings Unit

Recommended supply voltage V

CC

3.0 V

Operating voltage range V

CC

op 1.8 to 3.6 V

Load resistance

(power block) R

L

pwr 4 Ω

(preamplifier block) R

L

pre 10 kΩ

Operating Conditions at Ta = 25°C

SANYO: MFP30SD

[LA4168M]

Package Dimensions

unit: mm

3073A-MFP30SD

No. 5660-2/6

LA4168M

Parameter Symbol Conditions

Ratings

Unit

min typ max

[PRE + POWER + GVN]

Standby current I

STB

With pin 9 connected to V

CC

25 170 250 µA

through a 100-kΩ resistor

[PRE + POWER]

Quiescent current

I

CC-R

REC MODE, Vi = 0 V 6 12 18 mA

I

CC-P

PLAY MODE, Vi = 0 V, VOL MIN 12 18 25 mA

Voltage gain VG

TP

PLAY MODE, VO= –5 dBm 71.5 74 76.5 dB

[EQ AMP]

Voltage gain (open loop) VG

OPCNF

= 100 µF 80 85 dB

Voltage gain (closed loop) VG

P

50 52 54 dB

Maximum output voltage V

OP

max THD = 1 % 0.5 0.75 V

Total harmonic distortion THD

PVO

= 0.3 V 0.2 0.6 %

Equivalent input noise voltage V

NIP

Rg = 2.2 kΩ, DIN audio 1.0 2.0 µV

Ripple rejection ratio R

rp

Rg = 2.2 kΩ, fR= 1 kHz filter 45 60 dB

[MIC AMP] VOL MIN, ALC OFF

Voltage gain (closed loop) VG

M

1 ALC OFF 43 45 47 dB

Maximum output voltage V

OmaxM

THD = 1 %, RL= 10 kΩ 0.5 0.75 V

Total harmonic distortion THD

MVO

= 0.3 V 0.6 1.0 %

Equivalent input noise voltage V

NIM

Rg = 3 kΩ, DIN audio 2.0 4.0 µV

Ripple rejection ratio SVRR Rg = 3 kΩ, f

R

= 1 kHz filter 40 53 dB

Input resistance R

IM

24 32 40 kΩ

[MIC + REC] VOL MIN

Voltage gain (closed loop) VG

RT

ALC OFF 63.5 65.5 67.5 dB

Maximum output voltage V

OmaxR

THD = 5 % 0.6 1.0 V

Output noise voltage V

NORT

MIC Input, Rg = 3 kΩ, DIN audio 3.5 8.0 mV

Ripple rejection ratio R

rRT

Rg = 3 kΩ, fR= 1 kHz , 1 kHz filter 20 32 dB

[POWER AMP]

Voltage gain (closed loop) VG

BTL

BTL ON, VO= –10 dBm 21.5 24 26.5 dB

Voltage gain (closed loop) VG

SIN

Single, VO= –10 dBm 20.5 23 25.5 dB

Output power

P

OBTL

THD = 10 %, BTL ON 200 350 mW

P

OSIN

THD = 10 %, Single 50 120 mW

Total harmonic distortion THD

BTL

BTL ON, VO= 0.25 V 0.1 0.8 2 %

Output noise voltage V

NOBTL

BTL ON, Rg = 0 kΩ 20 50 µV

Ripple rejection ratio R

rBTL

BTL ON, Rg = 0 kΩ, fR= 1 kHz , 1 kHz filter 50 70 dB

Output DC offset V

DCOFF

BTL ON, Rg = 0 kΩ 0 10 50 mV

Input resistance R

INBTL

21 30 39 kΩ

[ALC]

The input level width from the point the ALC

ALC width ALC

W

circuit operates to the point the harmonic 40 67 dB
distortion reaches 5%

ALC harmonic distortion ALC

THD

Vim = –40 dBm 1.0 2.0 %

ALC output ALC V

O

Vim = –40 dBm 0.33 0.43 0.53 V

ALC start input ALC V

IN

Vim = –40 dBm –79 –74 –69 dBm

[Voice Sensor (VOX)]

Operation start input voltage V

OP min

VOLUME (10 kΩ) max –90 –85 –80 dBm

Input hysteresis V

O HL

3 6 9 dB

[Auto-Stop]

Operation voltage V

I ATS

The pin 9 voltage at the point the auto-stop

0.65 0.7 V

circuit operates

[LED]

LED drive current I

LED

The input current when shorted

8 15 22 mA

through a 300-Ω resistor

[GVN]

Reference voltage Vref Im = 100 mA 1.1 1.25 1.4 V
Current division ratio K Im = 50 – 100 mA 45 50 55
Residual voltage Vsat V

REF

= CONT, Im = 200mA 0.1 0.2 0.5 V

The CONT pin voltage in speed up mode Vcont 0.35 0.41 0.47 V
Reference voltage/voltage characteristics

∆Vref

/∆V

CCVCC

= 1.8 to 4.5 V, Im = 100 mA 0 0.2 0.6 %/V

Vref

Current division ratio/voltage characteristics

∆K

/∆V

CCVCC

= 2.0 to 4.5 V, Im = 50 – 100 mA 0 0.3 0.7 %/V

K

Reference voltage/current characteristics

∆Vref

/∆Im

Im = 50 – 200 mA 0 0.002 0.03 %/mA

Vref

Current division ratio/current characteristics

∆K

/∆Im

Im = 50 – 100 mA to 150 – 200 mA –0.07 0.03 +0.07 %/mA

Vref

Operating Characteristics at Ta = 25°C, VCC= 3.0 V, RL= 4 Ω (power amplifier), RL= 10 kΩ (preamplifier),
f = 1 kHz, 0 dBm = 0.775 V