GENERAL DESCRIPTION

The Digital Servo Integrated Circuit Silent (DSICS) IC 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 are widely adjustable by means of a three-wire serial interface, which offers great flexibility for the application of different CD mechanisms

FEATURES

The DSICS realizes the following servo functions:

• 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.