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PDF LA1265 Datasheet ( Hoja de datos )

Número de pieza LA1265
Descripción FM/AM Tuner of Electronic Tuning Type
Fabricantes Sanyo Semicon Device 
Logotipo Sanyo Semicon Device Logotipo



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LA1265 Hoja de datos, Descripción, Manual
Ordering number : EN1820C
Monolithic Linear IC
LA1265
FM/AM Tuner of Electronic Tuning Type
Functions
FM : IF amplifier, quadrature detector, AF preamplifier,
signal meter, tuning indicator drive output (common
with stop signal, muting drive output).
AM : RF amplifier, MIX, OSC (with ALC), IF amplifier,
detector, AGC, signal meter, tuning indicator drive
output (common with stop signal).
Package Dimensions
unit : mm
3059-DIP22S
[LA1265]
Features
• Minimum number of external parts required.
• Excellent S/N.
• Local OSC with ALC.
• Local OSC buffer.
• Tuning indicator pin (common with narrow-band stop
signal and muting drive output).
• Variable stop sensitivity (variable separately for FM, AM)
• Low whistle.
• Signal meter pin.
Specifications
Maximum Ratings at Ta=25°C, See specified Test Circuit.
Parameter
Symbol
Conditions
Maximum supply voltage
Flow-in current
Flow-out current
VCC max
I8
I20
Pins 7, 8, 17
Pin 8
Pin 20
Allowable power dissipation
I22
Pd max
Pin 22
Ta60°C
Operating temperature
Topr
Storage temperature
Tstg
Operating Conditions at Ta=25°C
Parameter
Symbol
Recommended operating voltage VCC
Operating voltage range
VCC op
Conditions
SANYO : DIP22S
Ratings
16
20
1
2
650
–20 to +70
–40 to +125
Unit
V
mA
mA
mA
mW
°C
°C
Ratings
8.5
6 to 14
Unit
V
V
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
N2897HA (KT)/40194HK/O077KI/D095KI/2255KI, TS No.1820-1/15

1 page

LA1265 pdf
LA1265
6. If the coupling coefficient of the local OSC coil is small and an antiresonance point of approximately 100MHz is
present or the stray capacitance across pins 22 and 21 is large, a parasitic oscillation of approximately 100MHz may
occur in the buffer output (pin 22). In this case, connect a capacitance of approximately 30pF across pin 22 and GND.
7. AM OSC coil
Generally speaking, the following should be noted. Avoid winding with loose coupling between primary side and
secondary side (especially SW1, SW2). To put it concretely, the pot core type is better than the screw core type which
is loose in coupling. This prevents the local OSC frequency from turning third resonance frequency related to the
coupling coefficient.
8. Resistance across pin 8 and VDD.
If pin 8 is used for the stop signal (SD) only, without using LED, it is recommended to fix
resistance RL across pin 8 and GND to be 51kto 100k.
9. To prevent whistle from worsening, make the pattern of AM output pin 12 as short as
possible.
Input/Output Admittance
FM
IF
AM
Parameter Frequency
γi1 10.7MHz
ri
ci
– Parameter Frequency
RF γi19 1MHz
MIX γo17 500kHz
IF γi15 500kHz
Test Circuit : FM, AM-MW
ri
ci
ro
co
ri
co
Admittance
330
20
Unit
pF
Admittance
AGC-off (V16=1.4V) AGC-on (V16=2.5V)
15 16
44
––
33
22
10 8
Unit
k
pF
k
pF
k
pF
Unit (resistance : , capacitance : F)
T1 4147-1457-177 (Sumida)
T2 HW-40174 (Mitsumi)
T3a HW-40130, T3b HW-40131 (Mitsumi)
No.1820-5/15

5 Page

LA1265 arduino
Coil Specifications
MW antenna
Bar antenna (for PVC22KTL)
• TN-10896 (Mitsumi)
Loop antenna (for SVC321)
• LA300 (Korin Giken)
Loop antenna matching coil
• KT-412
MW OSC
• 4147-1457-177 (Sumida)
For PVC22KTL
LA1265
Tight solenoid direct winding
17T 0.5φ space winding
4T tight solenoid winding
• KO-387 (Korin Giken)
For SVC321
AM-IFT
Matching coil for SFU450B (1-element type)
(Mitsumi)
Internal 180pF
Matching coil for SFZ450B (2-element type)
(Mitsumi)
Internal 180pF
FM single tuning detection coil
(Mitsumi)
Internal 82pF±10%
Damping resistance
(Sumida)
Internal 180pF
(Sumida)
Internal 180pF
(Sumida)
Internal 82pF±10%
Damping resistance
No.1820-11/15

11 Page


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