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PDF LA1260 Datasheet ( Hoja de datos )

Número de pieza LA1260
Descripción FM/AM Tuner System for Radio-Casette Recorders/ Music Centers
Fabricantes Sanyo Semicon Device 
Logotipo Sanyo Semicon Device Logotipo
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LA1260 datasheet

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LA1260 pdf
LA1260
Figure 7
MW OSC characteristic
Relation between turn
ration n and OSC level
AM oscillation coil
Unit (capacitance : F)
Receiving frequency, fr – Hz
Generally speaking, the following should be noted. Winding with loose
coupling between 1 and 2 and between 1 and 3 must be avoided. (Particularly
SW1, SW2).
To put in concretely, the pot core type is better than the screw core type which
is loose in coupling. This prevents the local oscillation frequency from turning
third resonance frequency related to the coupling coefficient.
LED unlighted time and distortion in AM (MW)
By increasing the value of the electrolytic capacitor for AGC at pin 11 (Figure 8), the distortion in the AM mode can
be improved, but the LED unlighted time is made longer. 10µF is recommended for obtaining the optimum LED
unlighted time and distortion. The LED unlighted time is 200ms at this value (Approximately 400ms at 22µF).
FM-AM selection and dc level at pin 12
(1) Pin 12-used method=recommended circuit
The FM mode is entered with pin 12 open. When pin 12 and pin 6
are at the same potential in terms of DC, the AM circuit is turned on
by the internal switch. It should be noted that the dynamic range is
narrowed whether the potential at pin 12 is lower or high than that
at pin 6.
(2) Pin 13-used method
The AM mode is entered with pin 13 open. When pin 13 is
grounded, the FM circuit is turned on and the AM circuit is turned
off by the internal switch. In this case, pin 12 and pin 6 (VCC) are
at the same potential.
Figure 8
Input 100dBm
VCC=4.5V
AM mod. char. and electrolytic
capacitor at pin 11.
100Hz, capacitor across pin 11 and Gnd : 10µF
Unit (capacitance : F)
Modulation degree – %
No.1506-5/14

5 Page

LA1260 arduino
LA1260
8.5MHz spurious response
Output –39dBm
(referenced to ANT
input 24.5dBµ, 8.5MHz)
8.5MHz to 9.4MHz spurious response
Output –30dBm
(referenced to ANT
input 24.5dBµ, 8.5MHz)
Frequency, f – MHz
Receiving frequency, fr – MHz
SW input/output char.
30% detection
output
ANT input voltage – dB/m
LED lighted
Detection
output
AM mod. output
Noise voltage
Distortion
ANT input voltage – dBµ
No.1506-11/14

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