LA8608 데이터 시트보기 (PDF) - SANYO -> Panasonic

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LA8608

1.8 V Low-Voltage Narrowband FM-IF System

SANYO -> Panasonic 

IC Usage Notes

1. About the local oscillator

LA8608V

Fig. 1

Fig. 1 shows the equivalent circuit for the local oscillator.

In this circuit, when C1 = 22 pF, the change in the negative resistance versus C2 is shown in Fig. 2, the change in the operational

load capacitance is shown in Fig. 3, and the frequency deviation is shown in Fig. 4. In the application circuit,

C2 = 120 pF, and in this case the negative resistance according to Fig. 2 is –58 Ω. In order to increase the negative resistance, it is

necessary to decrease the value of C2. To increase the oscillation level, it is possible to add external resistor R1 and raise the local

oscillator current. However, the oscillation level on pin 1 must be set to 110 dB or less. If set to a greater level, distortion will

occur in the oscillation waveform.

Fig. 2

Fig. 3

Fig. 4

(Note)

Fig 2 to 4: C1 = 22 pF

Figs. 3, 4: Reference to operating load

capacitance 16 pF

No.4077 - 8/14

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