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參數(shù)資料
| 型號(hào)： | LC7185-8750 |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 30 MHz, PDIP30 |
| 封裝： | SDIP-30 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 152K |
| 代理商： | LC7185-8750 |
Continued from preceding page.
Pin Name
Pin No.
Type
Description
KI1 to KI4
10 to 13
.
Key inputs
Input from the key matrix
KO1 to KO3
14 to 16
.
Key scan output (75 Hz)
Output to the key matrix
Hold mode: Low (scanning stops)
Operation
(1) Channel Selection (up/down)
1.
Manual scanning (up/down)
Pressing the UP key increments by one channel and pressing the DN key decrements by channel.
When scanning reaches the end of the band, it automatically wraps around to the beginning.
2.
Auto scanning (up/down)
Holding the UP (or DN) key down for 500 ms or longer starts auto scanning. For both up and down scanning, each
channel takes 100 ms to scan.
3.
The unlock detected line (UL) is asserted (low) when the UP (or DN) key is pressed and deactivated 25 ms after the key
is released.
4.
The beep-tone control line (BEEP) is asserted (open) for 50 ms after each new channel is selected.
(2) Selecting an Emergency Channel (CH9/CH19)
1.
If the CH9 or CH19 switch is turned on, the LC7185 stores the value of the previous channel and asserts the beep-tone
control line for 50 ms.
2.
While the CH9 or CH19 switch is turned on, the LC7185 disables all keys except TX and PA (UP/DN, ME, and M1 to
M5 switches).
3.
Even if the CH9 or CH19 switch is turned off while transmitting using the CH9 or CH19 switch, keep the emergency
channel open until the LC7185 is in the receive mode.
4.
After the CH9 or CH19 switch is turned back off, the beep-tone control line is asserted for 50 ms and the LC7185
reopens the previous channel.
5.
Note the CH9 has a higher priority over CH19. As a result, if both switches are turned on, CH9 will be opened.
6.
The UL line is asserted for 25 ms after the CH9 or CH19 switch is turned off or on.
7.
Causes either ‘‘9’’ or ‘‘19’’ to blink on the display.
UP/DN Key
Channel
CH9/CH19
Switch
Channel
Lock: Open
LC7185-8750
No. 3356-6/12
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