First line: AK2341* AK2341 Encoder/Decoder CTCSS (Continuous Tone Controlled Squelch System) Encoder/Decoder programmed with frequencies. Built-in tone signal elimination filter conform (Digitally Coded Squelch) system. Built-in power down function Built-in (3.6864 MHz) oscillator circuit with crystal oscillatoAbstract: .. Low voltage operation L8~5.5 Y □ Compact plastic package is used 24 pin VSOP The AK2341 is an IC which supports CTCSS Continuous Tone Controlled Squelch System , compatible with EIA RS220A RS220A .. Tags: AK2341AK2341*datasheet abstract..