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参数资料
| 型号： | LA70100M |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO30 |
| 封装： | 0.375 INCH, MFP-30 |
| 文件页数： | 14/16页 |
| 文件大小： | 279K |
| 代理商： | LA70100M |
LA70100M
No.7204-7/16
Functional Description
(1) REC mode
Video signals which have been input to Pin 16, pass through the 4.3MHz BPF with unnecessary component (ex. sync signal)
removed, and the component of chroma signal is extracted. And the characteristics during transmission are made flat through a
4.3MHz-BELL filter. The center frequency of this filter has automatically been adjusted to be 4.286MHz. After that, the
limiter amplifier limits the amplitude, and the chroma signal frequency is converted to 1/4 by a divide-by-four circuit. Though
the limiter amplifier amplifies the noise of non-signal parts of the converted signal during synchronization, the sync gate circuit
cleans the peripherals of the sync signal. Still more, since this signal has rectangle waveforms, it contains unnecessary
component of frequency. To remove it, the signal passes through a 1.1MHz BPF and then is input to 1.1MHz-A-BELL filter.
The center frequency of this filter is automatically adjusted to 1.0715MHz, and has opposite characteristics to BELL
characteristics. Afterwards, unnecessary components around the sync signal are muted, low-band chroma signal is output to
Pin 12 through a buffer.
(2) PB mode
The low chroma signal that has been input from Pin 14 enters AGC amplifier and is controlled so that the output level of 4
times multiplier be constant. Then it passes through the 1.1MHz BPF with unnecessary components removed before input to
1.1MHz-BELL filter. The center frequency of this filter has automatically been adjusted to be 1.0715MHz. Next, this signal
passes through the 4 times multiplier composed of a 2
× multiplier + 2.2 MHz BPF + 2× multiplier + 2.2MHz TRAP + 4.3MHz
BPF with unnecessary component of frequency generated in multiplier removed. The first 2
× multiplier has auto carrier leak
balancer allowing beat obstruction reduced. Next, this signal is limited pulse amplitude by limiting amplifier, then noises
around the sync signal owing to limited amplifier are cleaned by the sync gate circuit. This signal has a rectangle waveform
and contains unnecessary components of frequency. To remove it, the signal passes through a 4.3MHz BPF before input to
4.3MHz-BELL filter. The center frequency of this filter is automatically adjusted to 4.286MHz, allowing the BELL
characteristics to the state during transmission. Afterwards, unnecessary components around the sync signal are muted,
low-band chroma signal is output to Pin 18 through a buffer.
4.3MHz
BPF
4.3MHz
BELL
20
16
LIM
1/4
DIVIDER
SYNC
GATE
1.1MHz
BPF
REC
MUTE
19
1.107MHz
4.286MHz
LOW CHROMA
SIGNAL OUTPUT
VIDEO SIGNAL
INPUT
MONITOR
OUTPUT
Fig.1 Signal flow in REC mode
11
MONITOR
OUTPUT
1.1MHz
A-BELL
12
PB
BELL
11
MONITOR
OUTPUT
1.1MHz
BPF
LOW CHROMA
SIGNAL INPUT
1.107MHz
AGC
AMP
14
15
AGC
DET
2.2MHz
TRAP
LIM
19
VM
X2
2.2MHz
BPF
X2
4.286MHz
20
MONITOR
OUTPUT
SYNC
GATE
PB
MUTE 18
PB CHROMA
SIGNAL OUTPUT
Fig.2 Signal flow in PB mode
4.3MHz
BPF
4.3MHz
BPF
4.3MHz
A-BELL
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