參數(shù)資料
型號(hào)： SAA7325H
廠商： NXP SEMICONDUCTORS
元件分類： 消費(fèi)家電
英文描述： Digital servo processor and Compact Disc decoder with integrated DAC CD10
中文描述： SPECIALTY CONSUMER CIRCUIT, PQFP64
封裝： PLASTIC, SOT-393-1, QFP-64
文件頁(yè)數(shù)： 24/68頁(yè)
文件大?。?/td> 273K
代理商： SAA7325H
1999 Jun 17
24
Philips Semiconductors
Product specification
Digital servo processor and Compact Disc
decoder with integrated DAC (CD10)
SAA7325
Fig.18 Motor 4-line PWM mode application diagram.
MGA364 - 2
VSS
+
M
MOTO1
V4
MOTO2
V5
100 nF
10
7.13.1.4
CDV/CAV output mode
In the CDV motor mode, the FIFO position will be put in
pulse-width modulated form on the MOTO1 pin [carrier
frequency (300
×
d) Hz], where ‘d’ is the disc speed factor.
The PLL frequency signal will be put in pulse-density
modulated form (carrier frequency 4.23 MHz) on the
MOTO2 pin. The integrated motor servo is disabled in this
mode.
The PWM signal on MOTO1 corresponds to a total
memory space of 20 frames, therefore the nominal FIFO
position (half full) will result in a PWM output of 60%.
In the lock to-disc (CAV) mode the CDV motor mode is the
only mode that can be used to control the motor.
7.13.2
S
PINDLE MOTOR OPERATING MODES
The operation modes of the motor servo is controlled by
decoder register 1 (see Table 11).
In the SAA7325 decoder there is an anti-windup mode for
the motor servo, selected via decoder register 1. When the
anti-windup mode is activated the motor servo integrator
will hold if the motor output saturates.
7.13.2.1
Power limit
In start mode 1, start mode 2, stop mode 1 and stop
mode 2, a fixed positive or negative voltage is applied to
the motor. This voltage can be programmed as a
percentage of the maximum possible voltage, via
register 6, to limit current drain during start and stop.
The following power limits are possible:
100% (no power limit), 75%, 50%, or 37% of maximum.
7.13.3
L
OOP CHARACTERISTICS
The gain and crossover frequencies of the motor control
loop can be programmed via decoder registers 4 and 5.
The following parameter values are possible:
Gains: 3.2, 4.0, 6.4, 8.0, 12.8, 16, 25.6 and 32
Crossover frequency f
4
: 0.5 Hz, 0.7 Hz, 1.4 Hz
and 2.8 Hz
Crossover frequency f
3
: 0.85 Hz, 1.71 Hz and 3.42 Hz.
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