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PDF LA75520K Data sheet ( Hoja de datos )
| Número de pieza | LA75520K | |
| Descripción | IF Signal Processing (VIFSIF) IC | |
| Fabricantes | Sanyo Semicon Device | |
| Logotipo |  |
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www.DataSheet.co.kr
Ordering number : ENA0648
LA75520K
Monolithic Linear IC
IF Signal Processing (VIF+SIF) IC
that Supports the PAL Video
Standard for TV Sets and VCRs
Overview
The LA75520K is a fully adjustment-free VIF + SIF signal processing IC for TV sets and VTRs that supports the PAL
video standard. It supports 38.0MHz, 38.9MHz, and 39.5MHz as the IF frequencies, as well as PAL sound multi-system
(M/N, B/G, I and D/K), and contains an on-chip sound carrier trap. The IC employs a 4MHz frequency (which can be
switched to 4.43MHz) as the reference frequency of the adjustment free circuit, and controls the VCO, AFT, and sound
filter using an external input signal.
Features
• Internal VCO adjustment free circuit eliminating the need for an external VCO coil.
• Internal sound carrier trap enables easy configuration of PAL sound multi-system at low cost.
• Considerably reduces the number of required peripheral parts.
• Use of digital AFT eliminates a problem of AFT tolerance.
• Package: DIP24S (300mil)
Functions
• VIF amplifier
• Adjustment-free VCO and PLL detector circuit
• Digital AFT circuit
• RF AGC
• Buzz canceller
• EQAMP
• Internal sound carrier trap
• First SIF detector circuit
• PLL-FM detector circuit
Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to
"standard application", intended for the use as general electronics equipment (home appliances, AV equipment,
communication device, office equipment, industrial equipment etc.). The products mentioned herein shall not be
intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace
instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety
equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case
of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee
thereof. If you should intend to use our products for applications outside the standard applications of our
customer who is considering such use and/or outside the scope of our intended standard applications, please
consult with us prior to the intended use. If there is no consultation or inquiry before the intended use, our
customer shall be solely responsible for the use.
Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate
the performance, characteristics, and functions of the described products in the independent state, and are not
guarantees of the performance, characteristics, and functions of the described products as mounted in the
customer's products or equipment. To verify symptoms and states that cannot be evaluated in an independent
device, the customer should always evaluate and test devices mounted in the customer's products or
equipment.
80807 MS PC 20070110-S00002 No.A0648-1/12
Datasheet pdf - http://www.DataSheet4U.net/
1 page  
www.DataSheet.co.kr
LA75520K
System changeover
a. SIF system SW
The SIF system can be changed over by setting A (pin 7) and B (pin 9) to GND and OPEN respectively.
A
GND
GND
OPEN
OPEN
B
GND
OPEN
GND
OPEN
BG
O
FM DET
I DK MN
De-emphasis
LEVEL
O 6dB
75μs
O 0dB 50μs
O 0dB 50μs
0dB 50μs
Note : Circles mean that the system indicated with a circle is selected
b. IF system SW
The IF frequency becomes 38.9MHz when pin 10 is open.
The IF frequency becomes 38.0MHz when pin 10 is set to GND.
The IF frequency becomes 39.5MHz when pin 10 is set to VCC.
c. Split/inter carrier SW
Inter-carrier is selected by setting the 1st SIF input (pin 13) to GND.
d. Reference frequency changeover SW
The reference frequency becomes 4.43MHz when pin 11 is OPEN.
The reference frequency becomes 4.0MHz when 270kΩ is connected between pin 11 and GND.
e. AFT mute level, trap point shift SW
By changing the pin 15 voltage, the potential and TRAP point at which AFT is muted can be set to either just or shift
(about +220kHz).
Pin 15 potential
VCC to 4V
4V to 2.5V
2.5V to 1V
1V to GND
* VCC=5V
AFT mute potential
MIDDLE (VCC/2)
MIDDLE (VCC/2)
HI (VCC)
HI (VCC)
TRAP point shift
Just
Shift
Just
Shift
f. FM detector function not used
To stop FM detection VCO without using the SIF circuit, short-circuit pin 1 – GND with resistance of 1kΩ or less.
No.A0648-5/12
Datasheet pdf - http://www.DataSheet4U.net/
5 Page 
www.DataSheet.co.kr
Continued from preceding page.
Pin No.
Pin name
16 IF AGC
LA75520K
Function
IF AGC filter connection pin.
The signal peak-detected by the built-in AGC
detector is converted to the AGC voltage at pin 16.
Additionally, a second AGC filter (a lag-lead filter)
used to create the dual time constants is provided
internally in the IC.
Use a 0.022μF capacitor as the external capacitor
(C1), and adjust the value according to the sag,
AGC speed, and other characteristics.
17 VIF IN2
18 VIF IN1
VIF amplifier input pin
The input circuit is a balanced circuit, and the input
impedance is as follows:
R ≈ 1.0kΩ
19 GND
20 RF AGC VR
RF AGC volume connection pin
This pin sets the tuner RF AGC operating point.
Also, the FM output and the video output can both
be muted at the same time by connecting this pin to
ground.
Equivalent Circuit
5kΩ
1kΩ
1kΩ
16
C1
17
18
21 SIF CARRIER OUT First SIF output pin
This is an emitter-follower output with a 200Ω
resistor attached in series.
22 AUDIO BIAS
FILTER
Connection pin for a filter used to hold the FM
detector output DC voltage fixed. Normally, a 1μF
electrolytic capacitor should be used. The
capacitance (CI) should be increased if the low
band (around 50Hz) frequency characteristics need
to be improved.
300Ω
20
21
200Ω
300Ω 40kΩ
40kΩ
22
+
C1
Continued on next page.
No.A0648-11/12
Datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LA75520K.PDF ] | |
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