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CXA2550M/N
Tracking Error Amplifier
Each signal current from the photodiodes E and F is I-V converted and input to Pins 7 and 8 via a resistor
which determines the gain. The signal is amplified by the gain amplifier, operated by the tracking error
amplifier and then the (F-E) signal is output to Pin 11.
The balance adjustment is performed by varying the combined resistance value of the feedback resistors,
which are T type-configured at the E I-V amplifier, by using the external resistance value of EI pin.
F I-V amplifier feedback resistance value = R
F1
+ R
F2
+ = 403k
Ω
E I-V amplifier feedback resistance value = (R
E1
// R
1
) + R
E2
+
Leave EI pin open when the balance adjustment is not executed in this IC.
The gain for F I-V and E I-V amplifiers becomes the same when EI pin is left open.
11
I-V
F
R
F1
260k
30k
I-V
E
7
8
12p
R
F3
26k
R
F2
13k
96k
96k
R
E1
260k
12p
R
E2
13k
R
E3
26k
9
TE
30k
EI
22k
4.7k
270k
R
1
R
2
220k
220k
R
F1
×
R
F2
R
F3
(R
E1
// R
1
)
×
R
E2
(R
E3
// R
2
)
Summary of Contents for PV420S
Page 1: ...SERVICE MANUAL PV420S WWW BBK RU ...
Page 72: ... 69 CXD3068Q Block Diagram ...
Page 73: ... 70 CXD3068Q Pin Configuration ...
Page 122: ... 119 CXD3068Q Timing Chart 1 3 ...
Page 123: ... 120 CXD3068Q Timing Chart 1 4 ...
Page 124: ... 121 CXD3068Q Timing Chart 1 5 ...
Page 129: ... 126 CXD3068Q Timing Chart 2 1 ...
Page 130: ... 127 CXD3068Q Block Diagram 2 2 ...
Page 131: ... 128 CXD3068Q Timing Chart 2 3 ...
Page 134: ... 131 CXD3068Q Timing Chart 2 6 ...
Page 138: ... 135 CXD3068Q VCO C Mode Fig 3 3 Access Flow Chart Using VCO Control ...
Page 140: ... 137 CXD3068Q Block Diagram 4 1 ...
Page 143: ... 140 CXD3068Q Timing Chart 4 4 ...
Page 147: ... 144 CXD3068Q Fig 4 6 a Auto Focus Flow Chart Fig 4 6 b Auto Focus Timing Chart ...
Page 148: ... 145 CXD3068Q Fig 4 7 a 1 Track Jump Flow Chart Fig 4 7 b 1 Track Jump Timing Chart ...
Page 149: ... 146 CXD3068Q Fig 4 8 a 10 Track Jump Flow Chart Fig 4 8 b 10 Track Jump Timing Chart ...
Page 150: ... 147 CXD3068Q Fig 4 9 a 2N Track Jump Flow Chart Fig 4 9 b 2N Track Jump Timing Chart ...
Page 151: ... 148 CXD3068Q Fig 4 10 a Fine Search Flow Chart Fig 4 10 b Fine Search Timing Chart ...
Page 152: ... 149 CXD3068Q Fig 4 11 a M Track Move Flow Chart Fig 4 11 b M Track Move Timing Chart ...
Page 157: ... 154 CXD3068Q Fig 4 15 CD TEXT Data Timing Chart ...
Page 162: ... 159 CXD3068Q Fig 5 3a Fig 5 3b ...
Page 196: ... 193 CXD3068Q Description of Data Readout ...
Page 200: ... 197 CXD3068Q ...
Page 201: ... 198 CXD3068Q ...
Page 202: ... 199 CXD3068Q ...
Page 207: ... 204 CXD3068Q Package Outline Unit mm ...
Page 208: ...This data sheet has been made from recycled paper to help protect the environment 205 ...