LA4581 datasheet(4/8 Pages) SANYO

No de pièce	LA4581

Description	Preamplifier Power Amplifier for 3V Headphone Stereos

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Fabricant	SANYO [Sanyo Semicon Device]

Site Internet	https://www.sanyo-av.com/us/

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Pin No.

Pin Function

8

PRE MUTE

v When VCC is applied, PRE MUTE ON.

v MUTE ON conditions: V8IN ^ VCC – 0.2 V, inflow current I7 7 60 µA (when VCC =3V)

9

Ripple Filter REF 2.7 V(C7 = 2.2 µF to 33 µF)

v Ripple Filter, Vref reference

v The Vref ripple rejection ratio worsens when C7 is made smaller.

v Rr is 55 dB for 22 µF; 35 dB for 2.2 µF.

10

Ripple Filter OUT 2.7 V

v Ripple rejection ratio: Rr is 38 dB when C7 = 22 µF; 30 dB when C7 = 2.2 µF.

v Outflow current I7 max=1mA

11

VCC 3.0 V

12

POWER GND

13

COMMON 1.2 V

14

POWER OUT1 1.2 V

v CH1 output.

15

POWER OUT2 1.2 V

v CH2 output

16

POWER MUTE 0.7 V (C10 = 1.0 µF to 4.7 µF)

v When connected to GND: POWER MUTE ON.

v MUTE ON conditions: V16 % 0.3 V, outflow current I16 7 2.5 µA.

v C10 can be used to control MUTE TIME.

v When C10 = 2.2 µF, VCC =3.0 V 0.7 sec.

17

FWD/REV SW (C11

% 0.47 µF)

v When connected to GND, PRE IN1R (pin 2) and IN2R (pin 23) turn on.

v When floating, PRE IN1F (pin 3) and IN2F (pin 22) turn on.

v C11 and R7 are intended for smoothing at the time of switching.

v REV condition: V17 % 0.2 V.

18

POWER IN2 1.8 V

v Input resistance RIN 7 30 kΩ

19

SW OUT2 1.8 V

v Provides PRE AMP2 when pin 8 is floating (PRE MUTE OFF) (equivalent to pin 20).

v Disconnects from PRE AMP2 and RIN ^ 500 kΩ when pin 8 is VCC (PRE MUTE ON).

20

PRE OUT2 1.8 V

v Like pin 19, 10 k

Ω load drivable.

21

PRE NF2 1.8V

22

PRE IN2F 1.8 V

v Turns on when pin 17 is floating.

v A bias resistor (2.2 k

Ω) must be connected between pin 22 and pin 24 (Vref) when no head is in use.

23

PRE IN2R 1.8 V

v Turns on when pin 17 is connected to GND.

v A bias resistor (2.2 k

Ω) must be connected between pin 23 and pin 24(Vref) when no head is in use.

24

Vref 1.8 V

v The reference voltage is set to 3/5

× VCC. Because Vref AMP (rO 7 10 Ω) is built in, C17 can be made smaller (1 µF).

v Inflow/outflow current I24 = ± 500 µA available.

Sample Application:

Radio set application.

As shown above, Radio on and

Pre Mute can be implemented with one-circuit

switch.

LA4581MB

No.3535-4/8

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