OQ8868

Features:

· Focus servo loop
· Radial servo loop
· Built-in access procedure
· Sledge motor servo loop
· Three line (TDA1301T-like; same on hardware level, coefficients differ) or I²C-bus serial interface with system controller. Other features are:
· Single supply voltage (5 V)
· Flexible system oscillator
· Usable for single/double Foucault and astigmatic focus
· Wide range of adjustable servo characteristics possible
· Automatic focus start-up procedure and in-lock indication
· Fast focus restart procedure
· Sophisticated track loss detection mechanism
· Extended radial error signal
· Automatic initialization and jump procedure for radial servo
· Automatic radial error gain and offset control
· Sophisticated defect detector
· Shock detector
· Fast serial communication
· Low noise servo loops
· Automatic gain control for the complete focus and radial loop
· Fast track counting signal input
· Steered sledge jump
· Radial actuator damping. Features that improve on its predecessor, the TDA1301T:
· Low noise in the focus loop
· Faster serial communication
· Improved jump performance. Added features are:
· High level watchdogs
· Decoder (LO9585, LO9588 or HD60) communication support
· Application debugging support
· Pulsed sledge mode
· Auto gain control on radial and focus loop
· I2C-bus serial communication
· Externally available defect detector signals.


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	6.5	V
VDDA	analog supply voltage	0	6.5	V
VSS	ground supply voltage difference between VSSA and VSSD	-5	+5	mV
Pdiss	power dissipation	-	200	mW
Tstg	storage temperature	55	150
Tamb	operating ambient temperature	-40	+85
Vesd	electrostatic handling	-2000	+2000	V

Description

The Digital Servo Integrated Circuit Silent (DSICS) IC OQ8868 provides all servo functions except the spindle motor control in two-stage Compact Disc (CD) systems. It offers a high degree of integration, combined with the low additional cost of external components. The servo characteristics of OQ8868 are widely adjustable by means of a three-wire serial interface, which offers great flexibility for the application of different CD mechanisms.

The servo chip OQ8868 accepts diode currents and drives various power stages. Proper functioning of the focus and radial AGCs requires a digital power stage (SZA1010). It can drive normal, CDM12-like, mechanisms.

It is the improved version of its predecessor, the DSIC2 (TDA1301).