LA7770 データシートの表示（PDF） - SANYO -> Panasonic

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LA7770

FSK Receiver for CATV Use

SANYO -> Panasonic 

LA7770

LA7770 Dynamic Behavior and Cautions on Designing

(1) Mixer

A double differential type mixer is employd with its input circuit configured as shown in Fig. 1, where the input

signal is mixed with the oscillator output by its double differential circuit.

The mixed signal will be output from its open collector pin 5.

Fig. 1

Caution

a. Since an internal bias is applied to the input pin (pin 20), be

sure to provide a DC blocking capacitor as shown in Fig. 2.

b. Connect the decoupling capacitor across pins 4 and 1 with the

shortest possible wiring.

Fig. 2

(2) Oscillator

A common-collector oscillator is employed as shown in Fig. 3, and enables the LC, crystal, or SAW-R operated

oscillations.

Fig. 3

No.2208–3/7

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