saa7825 NXP Semiconductors, saa7825 Datasheet - Page 24

• Manufacturer Part Number: saa7825
• Description: Cd Audio Decoder, Digital Servo And Filterless Dac With Integrated Pre-amp And Laser Control
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Table 11 Pin applications
7.15
7.15.1
The spindle motor speed is controlled by a fully integrated
digital servo. Address information from the internal 8
frame FIFO and disc speed information are used to
calculate the motor control output signals. Several output
modes, selected by decoder register 6, are supported:
2003 Aug 13
Pulse density, 2-line (true complement output),
(1
PWM output, 2-line, (22.05
frequency
PWM output, 4-line, (22.05
frequency
CDV motor mode.
CD audio decoder, digital servo and filterless
DAC with integrated pre-amp and laser control
NAME
PIN
V1
V2
V3
V4
V5
n) MHz sample frequency
Spindle motor control
M
OTOR OUTPUT MODES
NUMBER
PIN
71
72
73
74
75
MOTO2
MOTO1
output
output
output
TYPE
input
input
n) kHz modulation
n) kHz modulation
t
rep
= 45 s
Accelerate
REGISTER
ADDRESS
Fig.15 2-line PWM mode timing.
1100
1100
1101
1101
REGISTER
24
DATA
XXX1
XXX0
00XX
01XX
XX01
XX10
XX11
01XX
10XX
11XX
0000
7.15.1.1
In the pulse density mode the motor output pin (MOTO1)
is the pulse density modulated motor output signal.
A 50% duty factor corresponds with the motor not
actuated, higher duty factors mean acceleration, lower
duty factors means braking. In this mode, the MOTO2
signal is the inverse of the MOTO1 signal. Both signals
change state only on the edges of a (1
clock signal.
7.15.1.2
In the PWM mode the motor acceleration signal is put in
pulse-width modulation form on the MOTO1 output. The
motor braking signal is pulse-width modulated on the
MOTO2 output. The timing is illustrated in Fig 15. A typical
application diagram is illustrated in Fig 16.
t
dead
external off-track signal input
internal off-track signal used input may be read
via decoder status bit; selected via register 2
input may be read via decoder status bit;
selected via register 2
output = 0
output = 1
4-line motor drive (using V4 and V5)
Q-to-W subcode output
output = 0
output = 1
de-emphasis output (active HIGH)
output = 0
output = 1
240 ns
Pulse density output mode
PWM output mode (2-line)
Brake
FUNCTION
MGA366
Objective specification
SAA7825
n) MHz internal