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Número de pieza | LA1267 | |
Descripción | FM/AM Tuner of Electronic Tuning Type | |
Fabricantes | Sanyo Semicon Device | |
Logotipo | ||
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No Preview Available ! Ordering number : EN2012A
Monolithic Linear IC
LA1267
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), IF signal output.
Package Dimensions
unit : mm
3067-DIP24S
[LA1267]
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.
• Espesially suited for AM stereo, IF count electronic
tuning because of AM IF signal output.
SANYO : DIP24S
Specifications
Maximum Ratings at Ta=25°C, See specified Test Circuit.
Parameter
Symbol
Conditions
Maximum supply voltage
Flow-in current
Flow-out current
Allowable power dissipation
VCC max
I8
I22
I24
Pd max
Pins 7, 8, 19
Pin 8
Pin 22
Pin 24
Ta≤60°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
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)/40594HK/D105KI, TS No.2012-1/14
1 page LA1267
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 24 and 23 is large, a parasitic oscillation of approximately 100MHz may
occur in the buffer output (pin 24). In this case, connect a capacitance of approximately 30pF across pin 24 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 51kΩ to 100kΩ.
9. To prevent whistle from worsening, make the pattern of AM output pin 14 as short as possible.
Input/Output Admittance
FM
–
IF
Parameter Frequency
γi1 10.7MHz
–
ri
ci
AM
– Parameter Frequency –
RF
γi21
1MHz
ri
ci
MIX γo19 500kHz ro
co
IF γi17 500kHz ri
co
Admittance
330
20
Unit
Ω
pF
Admittance
AGC-off (V16=1.4V) AGC-on (V16=2.5V)
15 16
44
––
33
22
10 8
Unit
kΩ
pF
kΩ
pF
kΩ
pF
Test Circuit : FM, AM-MW
T1 : 4147-1457-177 (Sumida)
T2 : HW-40174 (Mitsumi)
T3 : HW-40130, 40131 (Mitsumi)
Unit (resistance : Ω, capacitance : F)
No.2012-5/14
5 Page 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
LA1267
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.2012-11/14
11 Page |
Páginas | Total 14 Páginas | |
PDF Descargar | [ Datasheet LA1267.PDF ] |
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