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PDF LA7975 Data sheet ( Hoja de datos )
| Número de pieza | LA7975 | |
| Descripción | PAL SIF Converter Circuit for TV and VCR Multi-system | |
| Fabricantes | Sanyo | |
| Logotipo |  |
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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
1 page  
LA7975
. Pin 5 is the output pin. The output from Pin 5 is input to the
SIF via a 6 MHz bandpass filter (BPF).
When 5.5 MHz is input to Pin 1, the spectrum shown in
Figure 10 is obtained at Pin 5. Even if there is a 5.85 MHz
NICAM signal, the D/U (desirable/undesirable) ratio at Pin 5
increases and the buzz characteristic does not deteriorate.
When 6 MHz is input at Pin 1 and there is a 6.552 MHz
NICAM signal, then 6.552 MHz is mixed with 500 kHz to
make 6.052 MHz. This becomes an interference signal and is
within the band for 6 MHz. Therefore,for 6 MHz input, Pin 4
is grounded with 10 kΩ to stop the oscillation and pass
through the input signal 6 MHz as is.
Figure 9
Output level
Unit (resistance: Ω)
Ceramic BPF
chracteristic
D/U ratio
Output level
Figure 10 (5.5 MHz input)
Interference obtained with LA7975 mixer
6.552 MHz – 500 kHz = 6.052 MHz
D/U
ratio
Figure 11 (6 MHz input)
Reference Characteristic Diagram
Input/output characteristic
VO – VCC
* S1 on for 6 MHz
measurement
Unit (resistance: Ω, capacitance: F)
Input level – dB/µV
* Input level 80 dB/µV S1 on
for 6 MHz measurement
Supply voltage, VCC – V
No.3994-5/6
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet LA7975.PDF ] | |
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