LA4590W View Datasheet(PDF) - SANYO -> Panasonic

Part Name

Description

View to exact match

LA4590W

1.5 V Stereo Headphone Preamplifier and Power Amplifier

SANYO -> Panasonic 

Function Descriptions

1. Low boost system

LA4590W

2. Low boost

The signals applied to each input are mixed and passed through a two stage low pass filter. Since the signal level is

reduced by the low pass filters it is amplified between the two low pass filter stages to correct the level. The signal

that has passed through the second low pass filter is reversed in phase with respect to the input signal and is input to

each power amplifier.

3. Channel 1 and 2 amplifiers

The positive phase input signals are input to the normal (+) inputs, and the reverse phase signal that was passed

through the low pass filter is input to the inverting (–) inputs.

4. Common amplifier

The signal that was passed through the low pass filter is phase inverted by an inverting amplifier and input to the

common amplifier's inverting (–) input. Note that this input signal is reverse phase from the signal input to the

channel 1 and channel 2 amplifier inverting (–) inputs. Since the amplifier's plus input is connected to Vref, it

functions as an inverting amplifier.

This circuit achieves a large dynamic range since the common amplifier and the channel 1 and channel 2 amplifiers

operate in reverse phases.

No. 4468-11/19

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