Technics SL-P222A - Page 13

m TERMINAL FUNCTIONS OF IC’s
e 1C6501 (TDA8808T): Photo diode signal processor
SL-P222A
Pin | [ vo 1/0
in ; A
E Mark Division Function Mark Division Function |
Gain control input of HF amplifier. FE O Current output of normalized,
1 GCHF | Current output from HF amplitude | switched focus error signal
detector Current output of switched focus
2 Vp I Positive supply voltage FElag oO error signal, intended for lag
oF : network
3 HFout fe) HF amplifier and equalizer voltage on
output LO oO Laser amplifier current output
iy 4 DET a ta I HF detector voltage input LM t Laser monitor diode input
5 Sc ! Starting up capacitor input Gain control input for AC and
On/oft control (start input: GCLF l LF amplifiers. Current output
a ‘ hi
6 Si/RD W/O ready signal output (starting up from Some jude detector
procedure successful) Re2 re) Summation of amplified |
; : currents from D3 and D4
7 Beq | Equalizer reference current input +
r - Summation of amplified
8 Bgc \ DC and LF gain control reference 21 Ret oO currents from D1 and D2
current input |
<7 er Current inputs to DC and
Focus normalizing circuit 22,23) D1, D2 ! : Se
9 |FOC START | starting current | = LF photo diode amplifier
Current input to DC and |
L 10 PLLH ie) PLL on hold output 24,25; D3, D4 | LFiphore disde-amplitie:
a | us O Track loss output 26 HFin i Current input to HF amplifier
12 DODSs | oe out detector suppression |
IORE 27 GND | Ground connection of device
Negative supply connection for
13 Vext I FE and FElag output stage; also Decouplina |
i pling input
substrate connection 28 DEC I (internal bypass}
Low pass filter for lret, used in
14 LPF oO track toss (TL) detector and
LF gain control
e 1C6503 (TDA8809T): Radial error signal processor
Pin 1/0 :
[Re | Mark Division Function
1 Vp I Positive supply voltage
2 Cosc1 \ Frequency setting capacitors for
3 Cose2 oscillator
[ 4 [ Rwob | Wobble generator input
—
5 Rose l Biassing resistor for oscillator
L frequency and internal amplitude
6 DIV4 I Divide-by-4 input
7 REdig oO Digital output of sign (Re2 — Re1)
8 B3
9 B2 Input control bits for off-, catch-
10 B1 | plat- status and DAC output current
| 11 BO
t 12 Vext(+) I | Positive external voltage input
Negative external voltage input
is Vertl--] (also substrate connection)
[44
GND
l
GND
terminal
p-—__}
Current output of amplified
1
L ° RADout . (Re2 — Re1) input currents
16 REin | | Radial error input
ae 7 REla fe) Voltage output of integrated
L L 9 (Re2 — Re1) input currents
Pin vo |
No. Mark Division Function
18 La | Connection of integrator capacitor
9 for (Re1 — Re2) input currents _ |
19 Lead 0 Lead output
20 Vref l Internal reference voltage output ‘|
21 AGC f Gain control input for rad ial
error signal
Biassing resistor for current output
a nee 0 for track jumping (3% bits)
23 offset in ! Offset control input for radial
offset
24 offset off O Offset control output for radial
offset
Low-pass filter for Re1 anc Re2,
25 CEE. used for radial offset control
High-pass filter for Ret and Re2,
26. | CAPE | used for radial offset control
Input for amplified curren ts from
af Rea photo-diodes D1 and D2
Input for amplified curren ts from
a aes photo diodes D3 and D4
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