NTE1254中文资料Integrated Circuit Phase–Lock Loop (PLL) Frequency Synthesizer for CB数据手册NTE规格书

描述 Description

Features:
• Programmable Divider – Divided by 3 to 255
• 10–Bit Divider
• Phase Detector
• Reference Oscillation Circuit
• On–Chip Filter Amplifier
• Code Converter
• Only two or three crystals required for CB radio AM frequency selection
• Unlocked signals are detected at instant stop “IS” terminal
• Two type program mode can be selected to change input mode level
   M: Low level Binary code input enables, divided by 3 to 255 .
   M: High level BCD code enables that the data at P . 1 to P6 port is offset 90 by code converter
• Internal active filter amplifier has a long holding time due to very high input impedance characteristics of the CMOS–this is to obtain very good spurious response.
• Output signal of the “I” can be used to stop the spurious radiation when the channel selector makes misprogramming such as rotary switch’s lose contact.
• High speed and low power consumption due to CMOS
• Single power supply and fully TTL compatible: VDD = 5 ± 0.5 Volts
• Operating Temperature: TA = –30° to 65°C
• Pull down resistors installed in program and mode switch inputs