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| 型号： | LA7770 |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDIP20 |
| 封装： | DIP-20 |
| 文件页数： | 3/7页 |
| 文件大小： | 82K |
| 代理商： | LA7770 |
LA7770
No.2208–3/7
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.
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.
(2) Oscillator
A common-collector oscillator is employed as shown in Fig. 3, and enables the LC, crystal, or SAW-R operated
oscillations.
Fig. 1
Fig. 2
Fig. 3
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