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.