Sanyo LA4581MB Specifications

Ordering number: EN3535A

Monolithic Linear IC

LA4581MB

Preamplifier + Power Amplifier

for 3V Headphone Stereos

Overview

The LA4581MB is an auto reverse-supported preamplifier +
power amplifier IC that is intended for use in 3V headphone
stereos.

Features

.

Preamplifier muting and preamplifier output on/off can be
implemented with one pin. This IC can easily be used to
construct a set with a radio.

.

The power amplifier needs no input/output coupling
capacitor.

.

A high-frequency cut capacitor is connected to the
preamplifier input pin and the power amplifier input pin.
(Anti-buzz provision)

.

Because V
grounding impedance is about 10 Ω. This eliminates the
need for a large capacitor.

.

8 Ω speaker drivable.

AMP (r0=10Ω) is built in, the virtual

ref

Specifications

Maximum Ratings atTa=25°C

Package Dimensions

unit : mm

3112-MFP24S

[LA4581MB]

SANYO : MFP24S

Parameter Symbol Conditions Ratings Unit
Maximum supply voltage V
Allowable power dissipation Pd max 530 mW
Operating temperature Topr –20 to +75
Storage temperature Tstg –40 to +125

max 4.5 V

CC

Operating Conditions atTa=25°C

Parameter Symbol Conditions Ratings Unit
Recommended supply voltage V
Operating supply voltage range V

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.

CC

op 1.8 to 3.6 V

CC

3.0 V

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

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

22896HA(II) No.3535-1/10

C

°

C

°

LA4581MB

Operating Characteristics atTa=25°C, VCC=3.0V,f=1kHz, 0.775 V = 0 dBm,

=10kΩ(preamplifier), RL=16Ω(power amplifier)

R

L

Parameter Symbol

Output

min typ max Unit

[Pre + Power]

Quiescent current I

CCO

Voltage gain (Closed) VG

Rg = 2.2 kΩ (preamplifer) VIN= 0 V 17 27 mA
VO= –5 dBm 65 68 71 dB

T

[Preamplifier]

Voltage gain (Open) VGo V
Voltage gain (Closed) VG1 V
Maximum output voltage V

max THD=1%,VCC= 1.8 V 0.1 0.2 V

O

Total harmonic distortion THD1 V
Equivalent input noise voltage V

1 Rg = 2.2 kΩ, B.P.F = 20 to 20 kHz 1.3 2.0 µV

N

= –5 dBm 70 80 dB

O

= –5 dBm 40 dB

O

= 0.2 V, VG = 40 dB/NAB 0.05 0.5 %

O

Crosstalk CT1 Rg = 2.2 kΩ, TUNE 1 kHz 60 80 dB
Ripple rejection ratio R

1

r

Rg = 2.2 kΩ,V
f = 100 Hz

= 1.8 V, Vr = –20 dBm,

CC

40 50 dB

[Power Amplifer]

Output voltage P
Voltage gain (Closed) VG2 V
Total harmonic distortion THD2 P
Interchannel crosstalk CT
Output noise voltage V

NO

Ripple rejection ratio R
Input resistance R
DC offset voltage V

ODC

THD = 10% 23 32 mW

O

T

= –5 dBm 25 28 31 dB

O

= 1 mW 0.4 1.0 %

O

VO= –5 dBm, Rv=0Ω 30 40 dB
Rg = 0, B.P.F = 20 to 20 kHz 24 40 µV

2 Rg=0,Vr= –20 dB, f = 100 Hz, VCC= 1.8 V 45 60 dB

r
IN

22 30 38 kΩ

off Between 13-14 and 15 –90 +90 mV

Note) Power amplifier voltage gain VG2 increases by about 1 dB for min/max respectively than specified above when RL=32Ω.

No.3535-2/10

Block Diagram

Test Circuit

LA4581MB

1.8 to 3.0 V

Unit (resistance: Ω, capacitance: F)

No.3535-3/10