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參數(shù)資料
| 型號(hào)： | AN8808SB |
| 廠商： | PANASONIC CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | Three-Beam Method Head Amplifier IC for CD supporting the hologram pick-up |
| 中文描述： | 1 CHANNEL, AUDIO AMPLIFIER, PDSO36 |
| 封裝： | 0.450 INCH, PLASTIC, SSOP-36 |
| 文件頁(yè)數(shù)： | 8/10頁(yè) |
| 文件大?。?/td> | 86K |
| 代理商： | AN8808SB |
ICs for CD/CD-ROM Player
AN8808SB
AGC
Table 2
Figure 4 : AGC
RFDET
The RFDET detects amplitude of RF signal inputted to Pin8. Threshold value is approx. 100mV (f= 500kHz), and RF Present
= L, RF Absent = H are outputted.
Pins31 and 32 are used to make the resistance converting the current to voltage variable. When these pins are directly
connected to V
REF
and 20k
of resistance is connected between TE and TE–, and between TE and TEOUT respectively,
equivalent resistance to TEOUT is 629k
.
In order to absorb the attenuation of RF signal by disk, pick-up dispersion, finger print and other factors, AGC circuit for RF is
incorporated.
The input impedance of Pin8 is approx. 27.9k
. ByPin10 (ARF), the gain-controlled RF-signal is outputted. Input allowable
level is approx. 1V
P–P
~ 500mV
P–P
~ 250mV
P–P
, and output is 1V
P–P
. Pin9 is a connecting pin with capacity for
constructing the
AGC loop filter, and it is recommended that the external capacitor of 1
μ
F around should be connected to it for V
CC
.
The VCBA is for tracking balance adjustment in the same way of for focus. Table 2 shows the tracking balance ratio under the
same conditions as shown in Table 1.
V
C
1.5V
2.5V
3.5V
E/F
0.14
1.0
7.0
F/E
7.0
1.0
0.14
9
10
8
ARF
AGC
RF
1
μ
F
V
CC
BDO Detection
BDO is detected by the low speed detection circuit and high speed detection circuit. The high speed detection circuit is
incorporated. On the other hand, the capacitor of the low speed detection circuit must be connected to Pin13. The capacity value
is 2200pF and it is recommended that it should be connected for V
CC
. When this capacity value of Pin13 is increased, BDO is
detected with large RF missing rate. When it is decreased, BDO can be detected with small RF missing rate.
BDO present = H
BDO absent = L
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