Pin No.
Pin Name
I/O
Description
-48-
IC DESCRIPTION - 1/12 (SSI33P3721)-1/2
RF SIGNAL INPUTS: Differential RF signal attenuator input pins.
CD PHOTO DETECTOR INTERFACE INPUTS: Inputs from the CD photo detector outputs.
PHOTO DETECTOR NTERFACE INPUTS: AC coupled inputs for the DPD from the main
beam Photo detector matrix outputs.
DIFFERENTIAL PHASE TRACKING LPF PIN: The external capacitance is connected between
CN.
DIFFERENTIAL PHASE TRACKING LPF PIN: The external capacitance is connected between
CP.
PHOTO DETECTOR INTERFACE INPUTS: Inputs from the main beam Photo detector matrix
outputs.
CD TRACKING ERROR INPUTS: Inverted(F) and non-inverted(E) inputs of the OP-Amp for
the CD tracking error.
CD TRACKING: E-F Opamp output for feed back.
CD CENTER ERROR INPUT: Inverted input of the OP-Amp for the CD center error.
CENTER ERROR OPAMP OUTPUT: CEIN Opamp output for feedback.
Ground pin for the servo block.
APC INPUT: DVD APC input pin from the monitor photo diode.
APC OUTPUT: DVD APC output pin to control the laser power.
APC INPUT: CD APC input pin from the monitor photo diode.
APC OUTPUT: CD APC output pin to control the laser power.
APC OUTPUT ON/OFF: APC output control pin. A low level activates LD output.(open high)
REFERENCE VOLTAGE OUTPUT: This pin provides the internal DC bias reference voltage
(+2.5 V fix). Output impedance is less than 50 ohm.
REFERENCE VOLTAGE INPUT : DC bias voltage input for servo output reference.
Power supply pin for the servo block
MIRROR DETECT OUTPUT: Mirror detect comparator output. Pseudo CMOS output.
MIRR SIGNAL PEAK HOLD PIN: The external capacitance is connected to VPB.
MIRR SIGNAL BOTTOM HOLD PIN: The external capacitance is connected to VPB.
LOW IMPEDANCE ENABLE: TTL compatible input pin that activates the FDCHG switches.
A low level activates the switches and the falling edge of the internal FDCHG triggers the fast
decay for the MIRR bottom hold circuit.(open high)
MIRR SIGNAL LPF PIN: The external capacitance is connected to VPB.
MIRR SIGNAL LPF PIN: The external capacitance is connected to VPB.
RF SIGNAL INPUT FOR MIRROR: AC coupled inputs for the mirror dection circuit from pull-
in signal output (PI).
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3
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5
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11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
32
33
34
35
DVDRFP
DVDRFN
PD1
PD2
A2
B2
C2
D2
CP
CN
D
C
B
A
F
E
CDTE
CEIN
CE1
VNB
DVDRD
DVDLD
CDPD
CDLD
___________
LDON
FDCHG
MLPF2
MLPF1
MIN
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