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부품번호 | LA7975 기능 |
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기능 | PAL SIF Converter Circuit for TV and VCR Multi-system | ||
제조업체 | Sanyo | ||
로고 | |||
전체 6 페이지수
Ordering number: EN3994B
Monolithic Linear IC
LA7975
PAL SIF Converter Circuit
for TV and VCR Multi-system
Overview
The LA7975 is an IC that converts PAL SIF signals (5.5 MHz,
6 MHz, and 6.5 MHz) to 6 MHz. For the sake of high sound
quality, this IC uses a unique mixer technique to supress
interference from NICAM signals.
Package Dimensions
unit : mm
3042C-SIP5
[LA7975]
Functions
. Mixer, amplifier, oscillator, oscillator mute
Features
. Resistant to interference by NICAM signals
. Small SIP-5 package
. Wide range of usage voltage (5 V to 12 V)
SANYO : SIP5
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Maximum supply voltage
Maximum feed current
Allowable power dissipation
Operating temperature
Storage temperature
Symbol
VCC max
I5 max
I4 max
Pd max
Topr
Tstg
Operating Conditions at Ta = 25°C
Parameter
Recommended supply voltage
Operating voltage range
Symbol
VCC
VCC op
Conditions
Ta % 70°C
Conditions
Ratings
13.2
3
1
200
–20 to +70
–40 to +150
Unit
V
mA
mA
mW
°C
°C
Ratings
9
5 to 12
Unit
V
V
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
73096HA(II)/8282TS No.3994-1/6
LA7975
. Pin 1 is the SIF input pin.
The filter in Figure 2 can be connected to the input section
to improve the buzz characteristic.
Figure 3 shows the characteristics for the filter in Figure 2.
If C1 is too small, the buzz characteristic improves for
normal input, but the filter cuts into the sound carrier and the
buzz characteristic deteriorates for the P/S (picture/sound
carrier) ratio.
Use C1 6 20 pF to 47 pF.
Figure 1
Unit (resistance: Ω, capacitance: F)
Filter characteristic
From video
output section
Figure 2
Unit (resistance: Ω, capacitance: F)
Frequency – Hz
Figure 3
. Pin 4 is the ceramic oscillator pin.
To make the oscillation waveform approach a sine wave,the
oscillation level is controlled internally.
Oscillation levels of 15 to 80 mVp-p at Pin 4 give the
waveform shown in Figure 5.
To stop oscillation, attach an external resistor as in Figure 6
and switch S1 on.
Here are the conditions for handling multiple systems.
Figure 4
Unit (resistance: Ω)
Figure 5
(Pin 4 oscillation waveform)
Input frequency
5.5 MHz
6.0 MHz
6.5 MHz
4.5 MHz
Oscillator
500 kHz
Oscillation stop
500 kHz
1.5 MHz
Pin 5 output
6 MHz
6 MHz
(pass through)
6 MHz
6 MHz
Figure 7
Figure 8 shows a proposed multi-system
Figure 6
Unit (resistance: Ω)
(Multi-system implementation)
Figure 8
Unit (resistance: Ω)
No.3994-4/6
4페이지 | |||
구 성 | 총 6 페이지수 | ||
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부품번호 | 상세설명 및 기능 | 제조사 |
LA7975 | PAL SIF Converter Circuit for TV and VCR Multi-system | Sanyo |
LA7976 | PAL SIF Converter Circuit for TV and VCR Multi-system | Sanyo |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |