LA1135M 데이터 시트보기 (PDF) - SANYO -> Panasonic

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LA1135M

AM Tuner System for Car Radios and Home Stereos

SANYO -> Panasonic 

LA1135, 1135M

Proper cares in using IC

1. Bias condition: RF VCC % IF VCC

2. Avoid coupling between the antenna tuning circuit and the local oscillation.

3. Connect detection capacitor C15 across pins 13 (output) and 14 (VCC) so that no leakage of the IF signal to the GND line

occurs. (If connected to GND, the tweet and the usable sensitivity may get worse.) Radiation from C15 may cause harmonics

in the IF signal to return to the RF stage, thereby leading to more tweet interference. So, connect C15 as close to pins 13, 14

as possible. Consider the direction of the capacitor and separate it from the ANT circuit.

4. For R9, use a semifixed resistor with VSM considered.

5. When designing the coils, consider the following conditions.

Shown below is the input level at each pin at which the detection output at fm = 400 Hz 30% mod becomes –25 dB.

ANT MIX IF Det

16.0 28.0 45.0 61.0 (dBµ)

How to apply input to each stage

ANT stage

ANT input

MIX stage

IF stage

Det stage

Unit (resistance: Ω, capacitance: F)

6. ANT damping

To make the ANT damping constant within the receiving band, change the application circuit as shown below.

Old circuit

New circuit

Double tuning

Double tuning

Measures

Replace R1 with CD.

CD (2000 pF to 3000 pF or thereabouts)

Relocate L2.

Damping (600 kHz to 1400 kHz) Old circuit –15 dB

New circuit –4 dB

No. 1272-6/18

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