AK2345

Overview

The AK2345 is a Continuous Tone Controlled Squelch System (CTCSS) encoder/decoder integrated with voice signal processing circuits, manufactured by Asahi Kasei Microdevices. It supports programmable frequencies up to 50 channels and features a built-in high-speed tone decoder with a typical response time of 150ms at 67Hz. The device includes integrated limiter and splatter filter functions for audio conditioning. An internal oscillator circuit operates with external crystals at 3.6864 MHz or 4.194304 MHz. It functions within a low voltage range of 1.8 V to 5.5 V and is housed in a 24-pin VSOP package.

Feature Summary

• Integrated CTCSS encoder and decoder functionality supporting up to 50 programmable frequencies
• Built-in voice signal processing circuits including limiter and splatter filter
• Internal oscillator circuit compatible with 3.6864 MHz or 4.194304 MHz crystal inputs

Applications

• Two-way radio communication systems
• Professional audio equipment requiring sub-audio signaling
• Industrial control systems utilizing CTCSS protocols

Procurement Notes

Verify the specific ordering suffix to confirm the operating temperature range and package variant, as these details define the exact part configuration. Confirm RoHS compliance status through official manufacturer documentation prior to procurement. Ensure the selected variant matches the required thermal and electrical specifications for the target application environment.

Selection Notes

Select this component for applications requiring integrated CTCSS encoding and decoding without external microcontrollers. Verify that the system design accommodates the required crystal frequency for the internal oscillator. Ensure the power supply voltage remains within the 1.8 V to 5.5 V operational range. Consider the 24-pin VSOP package dimensions for PCB layout constraints.

Part Context

The AK2345 belongs to the Asahi Kasei Microsystems family of specialized audio and sub-audio processors designed for communication devices. It complements other AKM products like the AK2346 series, which focus on broader two-way radio audio processing. This component specifically addresses the need for compact, low-voltage CTCSS solutions in portable and base station radios.

Replacement Considerations

Publicly confirmed direct substitute part numbers are not available in the provided documentation. Evaluate alternatives such as the AK2346A or AK2346B for similar two-way radio audio processing requirements, noting potential differences in feature sets and pin configurations.