CXA3117AN Ver la hoja de datos (PDF) - Sony Semiconductor
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CXA3117AN Datasheet PDF : 30 Pages
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CXA3117AN
6) Quick Charge
In order to hasten the rising time from when power is turned on, the CXA3117AN 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 7 to
determine the average signal level during steady-state reception. The capacitance value connected to Pin
7 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 18. 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 18 to GND when quick charge is not being used.
Power supply to the IC
(Pin 4)
Quick charge
5ms
1ms
(Pin 18)
Battery saving control
(Pin 17)
A
A
T2
T1
T3
T4
1ms
A
Fig. 3
Example when the Pin 7 REF capacitance value is 1µF
T1 in Fig. 3: 2-level data setting time after quick charge
When the input frequency offset is within ±4.8kHz: 0ms
T2 in Fig. 3: 4-level data setting time after quick charge
When the input frequency offset is within ±1.6kHz or less: 0ms
When the input frequency offset is within ±3kHz or less: 500ms or less
T3 in Fig. 3: 4-level data is obtained
T4 in Fig. 3: 2-level data is obtained
– 10 –
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