CXA2555Q
Tracking Error Amplifier
The signal current from the photodiode F is I-V converted and input to Pin 6 via the input resistor. The signal
current from the photodiode E is I-V converted and input to Pin 5 after its gain is adjusted by the volume.
These signals undergo operational amplification at the tracking error amplifier, VCA and tracking drive
amplifier and they are output to Pin 13.
14p
Vc
2p
62k
320k
100k
E
I-V
73.4k
5
VCA
13 TE
44k
F
Vc
6
8
I-V
112k
TE1
12
TE C
Vc
47k
The low frequency component of the TE output voltage is as follows:
112k
44k
320k
VTE =
×
× (F – E)
73.4k
= 11.1 × (F – E)
(TEC voltage = 1/2 VC)
Center Error Amplifier
The input signal is operational amplified by the center error amplifier and center drive amplifier after passing
via the input resistor and then it is output to Pin 11.
20k
10k
CE IN
20k
Vin
9
CE
11
100k
23k
CE1
10k
10
Vc
The low frequency component of the CE output voltage is as follows:
100k
10k
20k
20k
VCE =
×
× Vin
= 10 × Vin
– 16 –
SONY [ SONY CORPORATION ]
