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Part: OQ8868HP
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INTEGRATED CIRCUITS
DATA SHEET
OQ8868 Digital Servo Integrated Circuit Silent (DSICS)
Product specification Supersedes data of 1996 Apr 11 File under Integrated Circuits, IC01 1997 Feb 12
Philips Semiconductors
Product specification
Digital Servo Integrated Circuit Silent (DSICS)
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. ORDERING INFORMATION TYPE NUMBER OQ8868 PACKAGE NAME QFP44 DESCRIPTION plastic quad flat package; 44 leads (lead length 1.3 mm); body 10 × 10 × 1.75 mm 2 Added features are: · High level watchdogs
OQ8868
· 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. 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. The servo chip 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).
VERSION SOT307-2
1997 Feb 12
Philips Semiconductors
Product specification
Digital Servo Integrated Circuit Silent (DSICS)
QUICK REFERENCE DATA SYMBOL VDDD VDDA IDDD IDD(q) IDDA II PARAMETER digital supply voltage analog supply voltage digital supply current digital quiescent supply current analog supply current input current for pins D1 to D4 for pins S1 and S2 Ptot Tamb Notes 1. Maximum input range varies from 3.8 to 12 µA and varies with the reference current through XTLR. 2. Maximum input range varies from 1.9 to 6 µA and varies with the reference current through XTLR. total power dissipation operating ambient temperature note 1 note 2 - - - -40 - - 115 - 12 6 - +85 CONDITIONS MIN. 4.5 4.5 - - - - - 17 - 5 TYP.
OQ8868
MAX. 5.5 5.5 - 10 - V V
UNIT
mA µA mA µA µA mW °C
1997 Feb 12
3
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