GENERAL DESCRIPTION
The TDA1301T is a fully digital servo processor which has been designed to provide all servo functions, except the spindle motor control, in two-stage three-spot compact disc systems. The device offers a high degree of
integration, combined with the low additional cost of external components. The servo characteristics have a
wide range of adjustment via a three-line serial interface. This offers an enormous flexibility with respect to
applications for different CD mechanisms. The circuit is optimized for low-power low-voltage applications.

FEATURES
The DSIC2 realizes the following servo functions:
• Diode signal preprocessing
• Focus servo loop
• Radial servo loop
• Sledge motor servo loop
• Three-line serial interface via the microcontroller The other features include:
• Full digital signal processing
• Low power consumption, down to 30 mW
• Low voltage supply 3 to 5.5 V
• Integrated analog-to-digital converters and digital servo loop filters
• Double speed possible
• Easy application
– Single supply voltage
– Small number of external components; only 6 decoupling capacitors
– Flexible system oscillator circuitry
– Usable for single/double Foucault and astigmatic focus
– Full automatic radial error signal initialization offset control and level initialization for track position indicator
– No external adjustments required; no component ageing
– Wide range of adjustable servo characteristics
– Simple 3-line serial command interface
– 28-pin SO package
– Great flexibility towards different CD mechanisms
– Full and transparent application information
• High robustness/shock insensitivity
– Sophisticated track-loss (TL) detection mechanism
– Fast focus restart procedure
– Extended radial error signal
– Adjustable radial shock detector
– Defect drop-out detector
• Fully automatic jump procedure for radial servo
• Automatic focus start-up procedure and built-in FOK (Focus OK)
• Fast radial jump or access procedure
• Self-operational servo-control without continuous communication via the microcontroller
• Direct communication to photodiode optics; no external preprocessing.