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PDF LA7565E Data sheet ( Hoja de datos )
| Número de pieza | LA7565E | |
| Descripción | IF Signal-Processing IC | |
| Fabricantes | Sanyo Semicon Device | |
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Ordering number :ENN6100A
Monolithic Linear IC
LA7565E, 7565KM
IF Signal-Processing IC for PAL/NTSC Multi-System
Audio TV and VCR Products
Overview
The LA7565E and LA7565KM are PAL/NTSC multi-
system audio VIF/SIF signal-processing ICs that adopt a
minimal-adjustment technique. The VIF circuit adopts a
minimal-adjustment technique in which AFT adjustment is
made unnecessary by VCO adjustment to simply end
product adjustment. The FM detector circuit uses PLL
detections to support multi-system audio detection. Since
the LA7565BM include an SIF converter on chip, it is easy
to implement multi-system audio. In addition, it also
includes a buzz canceller that suppresses Nyquist buzz to
achieve improved audio quality. The LA7565G and
LA7565KM feature improvements over the LA7565B and
LA7565BM in the FM low-range frequency characteristics,
vertical synchronization buzz, and AFT drift.
Functions
[VIF Block]
• PLL detector
• AFT
• RF AGC
• Buzz canceller
• Equalizer amplifier
• SIF converter
• VIF amplifier
• IF AGC
[First SIF Block]
• First SIF detector
• First SIF amplifier
[SIF Block]
• PLL type FM detector
• Limiter amplifier
Features
• Allows the use of a switch circuit to switch between
spilt and intercarrier operation.
• Improved buzz and buzz beat characteristics provided by
a PLL detector plus buzz canceller system.
• The IF AGC second filter is built in.
• PAL/NTSC multi-system audio can be implemented
easily.
• Adjustment-free circuit design that does not require AFT
and SIF coils.
Any and all SANYO products described or contained herein do not have specifications that can handle
applications that require extremely high levels of reliability, such as life-support systems, aircraft’s
control systems, or other applications whose failure can be reasonably expected to result in serious
physical and/or material damage. Consult with your SANYO representative nearest you before using
any SANYO products described or contained herein in such applications.
SANYO assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other
parameters) listed in products specifications of any and all SANYO products described or contained
herein.
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
40703AS (OT) No. 6100-1/18
1 page  
LA7565E, 7565KM
Internal Equivalent Circuit and External Circuit Diagram
AUDIO
OUT PUT 5.6 kΩ
+
24 23
1 kΩ
RFAGC
VR
22 21 20
620 Ω
30 pF
V
SAW(P)
19 18
RF AGC
OUT PUT
IF
IN PUT
SAW
(S)
17 16 15 14 13
1 kΩ
2 kΩ
1 kΩ
1 kΩ V
V
400 Ω
400 Ω
1V
1 kΩ 1 kΩ
1 kΩ 2 kΩ
1 2 3 4 5 6 7 8 9 10 11 12
68 Ω +
BPF
6MHz
330 Ω
+
330 Ω
VCO
COIL
VIDEO
OUT
AFT
OUTPUT
VCC
GND
T00049
No. 6100-5/18
5 Page 
LA7565E, 7565KM
Continued from preceding page.
Pin No.
5 VCC
Pin
Pin function
VCC and ground should be decoupled with as small a
separation as possible.
Equivalent circuit
6
7 EQ amp
8
Connections for the equalizer circuit. This circuit corrects the
frequency characteristics of the video signal.
Pin 8 is the equalizer amplifier input. A 1.5-Vp-p video signal
is input and amplified to 2.0 Vp-p by the equalizer amplifier.
The equalizer amplifier is designed as a voltage-follower
amplifier with a gain of about 2.3 dB. When frequency
characteristic correction is used, a capacitor, an inductor,
and a resistor must be connected in series between pin 7
and ground.
• Using the equalizer amplifier
If vi is the input signal and vo is the output signal, then:
R1/Z + 1 (vi + vin) = Vo × G
Where,
G: Gain of the voltage follower amplifier
vin: Imaginary short
G: About 2.3 dB
Assuming vin ≈ 0:
Then,
AV = voG/vi = R1/Z + 1.
R1 is an IC internal resistor with a value of 1 kΩ. Simply
select a Z according to the desired characteristics. However,
since the equalizer amplifier is maximum at the Z resonance
point, care is required to prevent distortion from occurring at
that frequency.
2 kΩ
1 kΩ
7
C
L =Z
R
EQ INPUT
8
200 Ω
6
EQ OUTPUT
A12056
AGC
A12057
9 APC filter
PLL detector APC filter connection.
The APC time constant is switched internally. When the PLL
is locked, the VCO is controlled over the path marked A in
the figure and the loop gain is lowered. When the PLL is
unlocked and in weak field reception conditions, the VCO is
controlled over the path marked B in the figure and the loop
gain is increased.
We recommend values of:
R = between 150 and 390 Ω, and
C = 0.47 µF
for this APC filter.
FROM
APC DET
A
1 kΩ 1 kΩ 1 kΩ
B
9
A12058
Continued on next page.
No. 6100-11/18
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet LA7565E.PDF ] | |
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