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Details, datasheet, quote on part number:OQ8844T
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Datasheet text preview:
INTEGRATED CIRCUITS
DATA SHEET
OQ8844 Digital Servo Driver (DSD-2)
Product specification File under Integrated Circuits, IC01 1995 Nov 27
Philips Semiconductors
Product specification
Digital Servo Driver (DSD-2)
FEATURES Servo functions · 1-bit class-D focus actuator driver (3.3 ) · 1-bit class-D radial actuator driver (3.7 ) · 1-bit class-D sledge motor driver (2.5 ). Other features · Supply voltage 5 V only · Small package (SOT163-1) · Higher efficiency, compared with conventional drivers, due to the class-D principle · Built-in digital notch filters for higher efficiency · Enable input for focus and radial driver · Enable input for sledge driver · Differential outputs for all drivers · Separate power supply pins for all drivers. QUICK REFERENCE DATA SYMBOL VDDD VDD(F) VDD(R) VDD(S) IDDDq IDD(F) IDD(R) IDD(S) fi(clk) Ptot Tamb digital supply voltage supply voltage focus actuator supply voltage radial actuator supply voltage sledge actuator quiescent supply current digital part supply current focus supply current radial supply current sledge input clock frequency total power dissipation operating ambient temperature PARAMETER MIN. 4.5 4.5 4.5 4.5 - - - - - - -40 - - - - - 126 20 150 4.2336 110 - TYP. GENERAL DESCRIPTION
OQ8844
The OQ8844 or Digital Servo Driver 2 (DSD2) consists of 1-bit class-D power drivers, which are specially designed for digital servo applications. Three such amplifiers are integrated in one chip, to drive the focus and radial actuators and the sledge motor of a compact disc optical system. The main benefits of using this principle are its higher efficiency grade compared to conventional analog power amplifiers, its higher integration level, its differential output and the fact that only a few external components are needed. When using these digital power drivers in a digital servo application, the statement `complete digital servo loop' becomes more realistic.
MAX. 5.5 5.5 5.5 5.5 10 250 250 560 5 - +85
UNIT V V V V µA mA mA mA MHz mW °C
ORDERING INFORMATION TYPE NUMBER OQ8844 PACKAGE NAME SO20 DESCRIPTION plastic small outline package; 20 leads; body width 7.5 mm VERSION SOT163-1
1995 Nov 27
2
Philips Semiconductors
Product specification
Digital Servo Driver (DSD-2)
BLOCK DIAGRAM
OQ8844
VDDD VDD(R) VDD(F) VDD(S) 6 4 13 14 1 ENDSTAGE H -BRIDGE 11 12 RA+ RA-
RAC
N DIGITAL OTCH FILTER
OQ8844
FOC 3 N DIGITAL OTCH FILTER ENDSTAGE H -BRIDGE 15 16 FO+ FO-
SLC CLI EN1 EN2
2 7 8 9 CONTROL
N DIGITAL OTCH FILTER
ENDSTAGE H -BRIDGE
19 20
SL+ SL-
5
10
17 VSS(F)
18
MBG785
VSSD VSS(R)
VSSS
Fig.1 Block diagram.
1995 Nov 27
3
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