OQ8844

Features:

Servo functions
· 1-bit class-D focus actuator driver (3.3 W)
· 1-bit class-D radial actuator driver (3.7 W)
· 1-bit class-D sledge motor driver (2.5 W).
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.

Application

·These products are not designed for use in life support appliances, devices, or systems where malfunction of these
products can reasonably be expected to result in personal injury. Philips customers using or selling these products for
use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such improper use or sale.


Pinout




Specifications

SYMBOL	PARAMETER	MIN.	MAX.	UNIT
VDDD	digital supply voltage	-0.5	+6.5	V
VDDA	analog supply voltage	-0.5	+6.5	V
VSSD - VSSA	ground supply voltage difference	-5	+5	mV
Ptot	total power dissipation	-	730	mW
Tstg	storage temperature	-55	+150
Tamb	operating ambient temperature	-40	+85

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 OQ8844 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 OQ8844, 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.