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OQ8844 Datasheet

Digital Servo Driver DSD-2

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INTEGRATED CIRCUITS
DATA SHEET
OQ8844
Digital Servo Driver (DSD-2)
Product specification
File under Integrated Circuits, IC01
1995 Nov 27


NXP Semiconductors Electronic Components Datasheet

OQ8844 Datasheet

Digital Servo Driver DSD-2

No Preview Available !

Philips Semiconductors
Digital Servo Driver (DSD-2)
Product specification
OQ8844
FEATURES
Servo functions
1-bit class-D focus actuator driver (3.3 )
1-bit class-D radial actuator driver (3.7 )
1-bit class-D sledge motor driver (2.5 ).
Other features
Supply voltage 5 V only
Small package (SOT163-1)
Higher efficiency, compared with conventional drivers,
due to the class-D principle
Built-in digital notch filters for higher efficiency
Enable input for focus and radial driver
Enable input for sledge driver
Differential outputs for all drivers
Separate power supply pins for all drivers.
GENERAL DESCRIPTION
The OQ8844 or Digital Servo Driver 2 (DSD2) consists of
1-bit class-D power drivers, which are specially designed
for digital servo applications. Three such amplifiers are
integrated in one chip, to drive the focus and radial
actuators and the sledge motor of a compact disc optical
system.
The main benefits of using this principle are its higher
efficiency grade compared to conventional analog power
amplifiers, its higher integration level, its differential output
and the fact that only a few external components are
needed. When using these digital power drivers in a digital
servo application, the statement ‘complete digital servo
loop’ becomes more realistic.
QUICK REFERENCE DATA
SYMBOL
PARAMETER
VDDD
VDD(F)
VDD(R)
VDD(S)
IDDDq
IDD(F)
IDD(R)
IDD(S)
fi(clk)
Ptot
Tamb
digital supply voltage
supply voltage focus actuator
supply voltage radial actuator
supply voltage sledge actuator
quiescent supply current digital part
supply current focus
supply current radial
supply current sledge
input clock frequency
total power dissipation
operating ambient temperature
MIN.
4.5
4.5
4.5
4.5
40
TYP.
126
20
150
4.2336
110
MAX.
5.5
5.5
5.5
5.5
10
250
250
560
5
+85
UNIT
V
V
V
V
µA
mA
mA
mA
MHz
mW
°C
ORDERING INFORMATION
TYPE
NUMBER
OQ8844
PACKAGE
NAME
DESCRIPTION
SO20 plastic small outline package; 20 leads; body width 7.5 mm
VERSION
SOT163-1
1995 Nov 27
2


Part Number OQ8844
Description Digital Servo Driver DSD-2
Maker NXP
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OQ8844 Datasheet PDF






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