Casio CTK-711EX Service Manual

— 19 —
DAC (LSI1: UPD6376GS)
UPD6376GS is a two-channel 16-bit Digital to Analog Convertor consisting of resistor string, output ampli-
fier and zero offset circuit.
The DAC receives 16-bit serial data output from the DSP. The data contains digital sound data of the
melody, chord, bass, and percussion for the right and left channels. The DAC converts the data into analog
waveforms by each channel and output them separately.
POWER AMPLIFIER (IC301: LA4620)
The power amplifier is a two-channel amplifier with standby switch.
6
16 2 10 11 13
12
Pre-drive
Amp.
Input
Amp.
Power
Amp.
+
–
Pre-drive
Amp.
Input
Amp.
Power
Amp.
+
–
9
7
3
5
+
–
Input
Amp.
Pre-drive
Amp.
Power
Amp.
+
–
Input
Amp.
Pre-drive
Amp.
Power
Amp.
4
19
20
21
22
23
1
18
17
15
14
8
RL Short
Protector
RL Short
Protector
Terminal
Protection
Circuit
Pop Noise
Prevention
Circuit
Ripple
Filter
IN11+
IN11–
IN12–
IN21+
IN21–
IN22–
NC DC MUTE ADJ
Boot11
OUT11
PoGND1
OUT12
Boot12
VCC1
Boot21
OUT21
PoGND2
OUT22
Boot22
VCC2
PriGND
Pin No. Terminal In/Out Function
1 SEL In Mode selection terminal. Connected to ground.
2 D.GND In Ground (0 V) source for internal digital circuit
3 NC Not used.
4 DVDD In +5 V source for internal digital circuit
5 A.GND In Ground (0 V) source for internal analog circuit
6 R.OUT Out Sound waveform output
7 A.VDD In +5 V source for internal analog circuit
8 A.VDD In +5 V source for internal analog circuit
9 R.REF In Reference voltage terminal. Connected to a capacitor.
10 L.REF In Reference voltage terminal. Connected to a capacitor.
11 L.OUT Out Left channel sound waveform output
12 A.GND In Ground (0 V) source for internal analog circuit
13 LRCK In Word clock (L/R separation signal) input.
14 LRSEL In Not used. Connected to ground.
15 SI In Sound data input
16 CLK In Bit clock input

Casio CTK-711EX Specifications

General

Brand	Casio
Model	CTK-711EX
Category	Electronic Keyboard
Language	English