CXA3107N Ver la hoja de datos (PDF) - Sony Semiconductor
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CXA3107N Datasheet PDF : 18 Pages
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CXA3107N
Application Note
1) Power Supply
The CXA3107N, with built-in regulator, is designed to permit stable operation at wide range of supply
voltage from 1.1 to 4.0 V. Decouple the wiring to VCC (Pin 20) as close to the pin as possible.
2) IF Limiter Amplifier
The gain of this IF limiter amplifier is approximately 100 dB. Take notice of the following points in making
connection to the IF limiter amplifier input pin (Pin 1).
a) Wiring to the IF limiter amplifier input (Pin 1) should be as short as possible.
b) As the IF limiter amplifier output appears at QUAD (Pin 5), wiring to the ceramic discriminator connected
to QUAD should be as short as possible to reduce the interface with the mixer output and IF limiter
amplifier input.
1
2
3
4
5
6
As short as possible
Fig. 1
3) Quick Charge
In order to hasten the rising time from when power is turned on, the CXA3107N features a quick charge
circuit. Therefore, the quick charge circuit eliminates the need to insert a capacitor between the detector
output and the LPF as is the case with conventional ICs. But a capacitor should be connected to Pin 4 to
determine the average signal level during steady-state reception. The capacitance value connected to Pin
4 should be chosen such that the voltage does not vary much due to discharge during battery saving.
Connect a signal for controlling the quick charge circuit to Pin 15. Setting this pin high enables the quick
charge mode, and setting this pin low enables the steady-state reception mode. Quick charge is used
when the power supply is turned on. The battery saving must be set high at the time.
Connect Pin 15 to GND when quick charge is not being used.
Power supply
(Pin 20)
Timing
Quick charge
(Pin 15)
Battery save
(Pin 14)
H
L
H
L
active battery
saving
Fig. 2
—10—
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