saa7803 NXP Semiconductors, saa7803 Datasheet - Page 44

• Manufacturer Part Number: saa7803
• Description: Saa7803 One Chip Cd Audio Device
• Manufacturer: NXP Semiconductors

Philips Semiconductors
9397 750 13695
Objective data sheet
Fig 27. Motor servo
PLL frequencey
FIFO filling
6.6.8.1 Frequency set point
0
6.6.8 Motor
A block diagram of the motor interface is given in
The motor interface consists of a PI filter and a PDM/PWM modulator. When put in a
closed loop, the motor controller can control both speed, frequency and position error
(FIFOFILL). It can be operated as a P, I or PI controller, by switching on and off the
appropriate switches ( SW1 and SW2 ).
The frequency and position error integrator gain, K
programmable. Frequency and filling set points are also programmable.
The frequency input source can be selected between PLL frequency and 0 Hz. The
position input source is always FIFO filling.
When operated in a stable operation point in closed loop, the motor controller will regulate
the frequency input source and the FIFO filling to their respective set points, this is
implemented by speeding up or slowing down the motor by changing the DC content in
the PDM/PWM output motor signals.
All motor parameters can be configured by programming the motor registers.
When operating the motor in CLV mode, based on EFM, for a certain overspeed, the
motor frequency set point to be programmed is given by
clock frequency and N the overspeed factor.
motor frequency set point 7:0
frequency
•
setpoint
setpoint
filling
The subcode syncs S0 and S1 are presented as all zeros on the interface (even
P-channel), such that the last subcode byte of a subcode-frame, and the first byte of
the next frame are separated by 28 zero-bits. This can be used to identify the start of
the subcode-frames within the stream.
SW1
SW2
K
K
F
l
Rev. 01 — 19 April 2005
K
K
F
I
_Mult
_Mult
=
256
M
motor
preset/readback
1
–
INT
----------------------------------------- -
N
G
E
2.667
Figure
delay
I
4.3218 10
24 T
and K
analog output stage gain
overflow
27.
detect
f
F
G
sys
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
, and gain G are
One chip CD audio device
6
MODULATOR
where f
PDM/PWM
overflow
detect
SAA7803
sys
is the system
001aab771
65,
66
MOTO1,
MOTO2
44 of 74