Andy's Technical Information Page
LC7185 PLL Frequency Synthesizer
This 27 MHz band, PLL frequency synthesizer LSI chip is designed specifically for CB transceivers.
The specifications are suited for use in U.S.A.(FCC).
The LC7185-8750 incorporates PLL circuitry and a controller for CB applications on a single CMOS chip.
The controller handles the PLL circuitry, frequency data ROM, channel preset/recall RAM, and LED display driver. It also supports channel scan, channel preset/recall, and emergency channel call.
| Pin | Name | Description |
| 1 | SA | Display Segment a |
| 2 | SB | Display Segment b |
| 3 | SC | Display Segment c |
| 4 | SD | Display Segment d |
| 5 | SE | Display Segment e |
| 6 | SF | Display Segment f |
| 7 | SG | Display Segment g |
| 8 | D1 | |
| 9 | D2 | |
| 10 | KI1 | Keyboard In 1 |
| 11 | KI2 | Keyboard In 2 |
| 12 | KI3 | Keyboard In 3 |
| 13 | KI4 | Keyboard In 4 |
| 14 | KO1 | Keyboard Out 1 |
| 15 | KO2 | Keyboard Out 2 |
| 16 | KO3 | Keyboard Out 3 |
| 17 | BEEP | |
| 18 | UL | |
| 19 | XOUT | X-tal Out |
| 20 | XIN | X-tal In |
| 21 | Vss2 | |
| 22 | TEST | |
| 23 | PIN | |
| 24 | GND | Ground |
| 25 | INIT | |
| 26 | HOLD | |
| 27 | PD | |
| 28 | Vss1 | |
| 29 | NC | No Connection |
| 30 | TX | |