FILTER BLOCK

Since the sound signals from the DAC are stepped waveforms, the filter block is added to smooth the waveforms.

To power amplifier

Filter Block

From DAC

POWER AMPLIFIER (IC102: LA4598)

The power amplifier is a two-channel amplifier with standby switch.

The following table shows the pin function of IC102.

Pin No.

Terminal

In/Out

Function

1

Power GND

 

In

Ground (0V) source

 

 

 

 

 

 

2

Ch1 B.S.

 

 

 

Terminal for a bootstrap capacitor

 

 

 

 

 

 

 

 

 

3

Ch1 OUT

 

Out

Channel 1 output

 

 

 

 

 

 

4

VCC

 

In

+9V source

 

 

 

 

 

 

5

Ch1 N.F.

 

In

Negative feedback input

 

 

 

 

 

 

6

Ch1 IN

 

In

Channel 1 input

 

 

 

 

 

 

7

D.C.

 

 

 

Terminal for a decoupling capacitor

 

 

 

 

 

 

 

 

 

8

Pre GND

 

In

Ground (0V) source

 

 

 

 

 

 

9

Stand by

 

In

Power control signal input. 0 V: Off, +9 V: On

 

 

 

 

 

 

10

Ch2 IN

 

In

Channel 2 input

 

 

 

 

 

 

11

Ch2 N.F.

 

In

Negative feedback input

 

 

 

 

 

 

12

Ch2 OUT

 

Out

Channel 2 output

 

 

 

 

 

 

13

Ch2 B.S.

 

 

 

Terminal for a bootstrap capacitor

 

 

 

 

 

 

 

 

 

14

NC

 

 

 

Not used

 

 

 

 

 

 

 

 

 

POWER SUPPLY CIRCUIT

The power supply circuit generates six voltages as shown in the following table. VDD voltage is always generated. The others are controlled by APO signal from the CPU.

Name

Voltage

For operation of

 

 

 

VDD

+5 V

CPU, Reset IC, Sound source ROM, LED Latches

 

 

 

DVDD

+5 V

Power jack, Photocoupler

 

 

 

AVDD

+5V

DAC, Filter

 

 

 

LVDD

+5 V

LED Drivers

 

 

 

VCC

+9 V

Power amplifier, Pilot lamp

 

 

 

VC

+9 V

Power amplifier

 

 

 

— 7 —

Page 7
Image 7
Casio CTK-530 manual Filter Block, Power Amplifier IC102 LA4598, Power Supply Circuit, Name Voltage For operation

CTK-530 specifications

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