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| 型號： | LA7577N |
| 元件分類： | 接收器 |
| 英文描述： | FM, AUDIO SINGLE CHIP RECEIVER, PDIP24 |
| 封裝： | DIP-24 |
| 文件頁數(shù)： | 2/16頁 |
| 文件大小： | 354K |
| 代理商： | LA7577N |
LA7577N
No. 4037—10/16
RF AGC Variable Resistor (Pin 4)
The operating point of the RF AGC can be adjusted using
a variable resistor connected to pin 4 as shown in Figure
11. When pin 4 is pulled to 0.5V or lower, both the FM
and video outputs are muted.
VIF Input (Pins 5 and 6)
The VIF amplier inputs on pins 5 and 6 should be capac-
itively coupled to block DC. The input signal is the aver-
age of the signals on these inputs. The input resistance is
approximately 1.5k
Ω and the input capacitance is approxi-
mately 3pF.
1st SIF Input (Pin 8)
The 1st SIF amplier input on pin 8, shown in Figure 13,
should be capacitively coupled to block DC. If a SAW l-
ter is used, an inductor should also be connected as shown
in Figure 14. This matches the SAW lter output capaci-
tance to the LA7577N input capacitance and increases the
sensitivity. The inductor typically would be 0.62
μH (for
Japan), 1.0
μH (for the USA) or 1.3μH (for PAL countries).
Figure 11. RF AGC adjustment
Figure 12. VIF stage
RF AGC Output (Pin 10)
The RF AGC output on pin 10 is an emitter follower with a
200
Ω series protection resistor as shown in Figure 15. The
value of the bleeder resistor connected between pin 10 and
the tuner, shown in Figure 16, should be chosen based on
the tuner maximum gain.
Figure 13. 1st SIF stage
Figure 14. SAW lter matching
Figure 15. RF AGC output
Figure 16. Bleeder resistor connection
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