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1998 Feb 16 21
Philips Semiconductors Product specification
CMOS digital decoding IC with RAM for
Compact Disc
SAA7345
PWM MODE,2-LINE
In the PWM mode the motor acceleration signal is put in pulse-width modulation form on the MOTO1 output and the
motor braking signal is pulse-width modulated on the MOTO2 output.
Figure 17 shows the timing and Fig.18 a typical application diagram.
MGA363 - 1
MOTO2
V
DD
V
SS
MOTO1
M
22 kΩ
10 nF
+
–
22 kΩ
10 nF
+
–
V
SS
V
SS
MOTO1
M
22 kΩ
10 nF
+
–
22 kΩ
22 kΩ
V
SS
V
DD
V
SS
22 kΩ
22 kΩ
Fig.16 Motor pulse density application diagrams.
Fig.17 Motor 2-line PWM mode timing.
rep
t = 45 µs
t 240 ns
dead
Accelerate Brake
MOTO1
MOTO2
MGA366
MGA365 - 2
V
SS
+
M
MOTO1 MOTO2
10 Ω
100 nF
Fig.18 Motor 2-line PWM mode application diagram.