LA4581 データシートの表示（PDF） - SANYO -> Panasonic

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LA4581

Preamplifier + Power Amplifier for 3V Headphone Stereos

SANYO -> Panasonic 

LA4581MB

Ambient temperature, Ta − °C

Sample Application Circuit

Preamplifier input is applied to pins 2,23/

pins 3,22 when SW ON/OFF, respectively.

POWER MUTE ON when

connected to GND.

Note) Pre closed loop gain VG = 40 dB/1 kHz NAB

PRE MUTE ON when

connected to VCC

1.8 to 3.6 V

Unit (resistance: Ω, capacitance: F)

Pin and external part functions (when the voltage is VCC = 3.0 V)

Pin No.

1

2

3

4

5

6

7

Pin Function

PRE GND

PRE IN1R 1.8 V

v Turns ON when pin 17 is grounded.

v A bias resistor (2.2 kΩ) must be connected between pin 2 and pin 24 (Vref) when no head is in use.

PRE IN1F 1.8 V

v Turns ON when pin 17 is floating.

v A bias resistor (2.2 kΩ) must be connected between pin 3 and pin 24 (Vref) when no head is in use.

PRE NF1 1.8 V

PRE OUT1 1.8 V

v Like pin 6, 10 kΩ load drivable.

SW OUT1 1.8V

v Provides PRE AMP1 output when pin 8 is floating (PRE MUTE OFF)(equivalent to pin 5).

v Disconnects from PRE AMP1 and sets RIN ^ 500 kΩ when pin 8 is at VCC (PRE MUTE ON).

POWER IN1 1.8V

v Input resistance RIN 7 30 kΩ

Continued on next page.

No.3535-3/8

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