LA1061 查看數據表（PDF） - SANYO -> Panasonic
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LA1061 Datasheet PDF : 8 Pages
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LA1061M
Functional Description
General Operation
The LA1061M has two inputs for weak and strong
signal detection, and one for multi-path distortion
detection. It has two outputs for Main and Sub-antenna
selection, one of which is selected according to the state
of the inputs. Both outputs can directly drive an antenna
switching pin diode.
Signal Strength Detection
Each signal strength detection input has a built-in
comparator. The weak signal comparator (pin 13) is
driven by the S-meter DC voltage and has a threshold of
approximately 2V. The antenna switching logic selects
the Main antenna when the voltage on this pin is lower
than the threshold, regardless of the state of the other
inputs.
The strong signal detector (pin 14) is driven by the F.E.
AGC voltage and has a threshold of approximately 1V.
The antenna switching logic selects the Sub-antenna if
the voltage on this pin is lower than the threshold, the
weak signal comparator is off, and the multi-path
distortion detector is not already on.
Multi-path Distortion Detection
The IF output signal is high-pass filtered and the
resulting noise signal input through a coupling capacitor
to pin 1, the LA1061M amplifies this signal and applies
AGC to it. The AGC amplifier is designed to detect
multi-path distortion without amplifying noise due to a
weak IF signal. The number of noise pulses within the
period set by the time constant on pin 4 is counted. If it
exceeds a certain limit, and the strong signal detector is
not already on, the antenna switching logic selects the
Main antenna.
Switching Frequency Detection
The LA1061M counts the number of antenna changes
within the time interval set by the time constant on pin
12. The internal D/A converter outputs a current on pin
11, which is converted to a voltage by the resistor
connected to this pin. If this voltage exceeds a certain
value, that is, the switching frequency is too high, the
Main antenna is selected for the period set by the time
constant on pin 10. The Main antenna is selected for this
time regardless of the state of the other inputs.
Pin Description
Pin No. Function
Unit (resistance : Ω, capacitance : F)
External circuits
Isolate noise components present in the IF output signal
with a high-pass filter, and input via a decoupling
capacitor.
Notes
The input impedance of the
LA 1061M varies with input
level. The minimum value is
10kΩ.
1 Noise input
Continued on next page.
No.3044-4/8
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