NXP Semiconductors TDA1301T
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.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 QUICK REFERENCE DATA SYMBOL VDDD VDDA IDDD IDDA IDDD(q) Ii(cd) Ii(sd) Ptot Tamb Note 1. fsys = 4.2336 MHz; VRL = 0 V; VRH = 2.5 V (externally applied).