AK2345 Datasheet | Asahi Kasei Microdevices

Features 1. CTCSS (Continuous Tone Controlled Squelch System) Encoder/Decoder. 2. Programmable for up to 50 CTCSS frequencies. 3. Integrated CTCSS signal elimination filter. 4. Built-in Adder TX CTCSS/CDCSS and voice signal. 5. Built-in high speed CTCSS Decoder. 6. Conform to CDCSS. (Continuous Digital Controlled Squelch System) 7. Integrated voice signal circuits such as a limiter, splatter filter, etc. 8. Built-in (3.6864 MHz or 4.194304 MHz) oscillator circuit with crystal oscillator. 9. Control register controlled via serial interface. 10. CMOS Process low voltage operation. (1.8V…5.5V) 11. pact plastic package is used. (24 pin VSOP) (Page 25) Description The AK2345 is an IC which supports CTCSS (Continuous Tone Controlled Squelch System), patible with the TIA/EIA-603 standard. A single CTCSS may be selected from among 50 different frequencies within a range of from 67 to 254.1 Hz. By sending that CTCSS simultaneously with the voice signal during transmission, and by setting the audio circuit so that it operates only when a CTCSS of that frequency is detected, it is possible to have multiple munications on the same radio frequency. TX has a built-in Adder CTCSS and voice signal, and RX has a built-in high-speed CTCSS Decoder respectively. Voice signal filters, a limiter, op-amp, and other circuits are integrated, making it possible to configure a radio base band unit, especially FRS from a single chip. - Pin assignment TXIN1 TXIN2 TXINO MOD MODIN SPOUT RXOUT VDD XIN XOUT STB SDATA/DCS 1 2 3 4 5 6 7 8 9 10 11 12 24 RXTONE 23 RXIN 22 RXINO 21 AGNDIN 20 AGND 19 LIMLV 18 LIMBS 17 DREF 16 TXTONE 15 VSS 14 DETOUT 13 SCLK C0041-E-03 -1- 2006/09 ASAHI KASEI Contents [AK2345] Section Feature ………...………………………………………… Description …………….………………………………… Block Diagram……….………………………………….. Circuit Configuration………….………………………… Pin/Function…………………………………………….. Absolute Maximum Ratings……...……………………. Remended Operating Conditions……..…………. Digital Characteristics…...………………………………...