Asahi Kasei Microdevices/AKM AK2363

Overview

AK2363 from Asahi Kasei is a radio signaling LSI integrating an MSK modem (1200/2400 bit/s) and DTMF receiver on a single chip, operating from 2.6V to 3.7V across –40°C to +85°C, with built-in 3.6864MHz oscillator and support for external clock multiples (7.3728/11.0592/14.7456MHz), used in legacy wireless telemetry and paging systems.

For engineers reviewing the AK2363 datasheet, AK2363 pinout, AK2363 application, or AK2363 equivalent, this page delivers verified functional identity, confirmed 24-pin QFNJ package mapping, validated MSK/DTMF dual-mode operation, real-world BER performance (5.0E–06 @1200 bit/s, SNR=12dB), and precise register-controlled frame detection and AGC/PGA configuration.

Technical Context

The AK2363 implements a fully integrated analog-digital hybrid architecture: its MSK modem uses a DAC-based modulator, BPF-filtered demodulator, and digital PLL for clock recovery, while the DTMF receiver employs programmable gain amplification (0–12dB), AGC control, and 4-bit tone decoding logic. Both subsystems share a common 3.6864MHz master clock source or externally divided multiples.

Control is executed via a three-wire serial interface (CSN/SCLK/SDATA) supporting 14-cycle write and 14-cycle read operations with R/W bit, 4-bit address, and 8-bit data framing; register access enables independent configuration of MSK speed (MSKSL), transmit enable (MSKTX), frame pattern (16-bit), DTMF guard times (GTP/GTA), and PGA/AGC modes (AGCSW/PGA).

Key Specifications

Pinout & Package

AK2363 is housed in a 24-pin QFNJ package (4.0 mm × 4.0 mm × 0.75 mm, 0.5 mm pitch) with exposed thermal pad (EP) connected to VSS for thermal management in compact wireless modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar radio signaling LSI applications.

Compared with AK2362 and CMX639, the AK2363 uniquely combines MSK modem and DTMF receiver in one die with integrated oscillator - enabling self-contained, low-component-count solutions for bidirectional legacy radio systems without external timing or tone-decoding ICs.

Availability

AK2363 is available at Aetrix Electronics and suitable for wireless telemetry transmitters, paging system decoders, legacy radio control units, industrial alarm annunciators, and narrowband RF infrastructure requiring stable component supply and long-term obsolescence management.

Supply support for AK2363 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Asahi Kasei Microdevices Corporation is a Japanese semiconductor manufacturer specializing in mixed-signal LSI for communications, audio, and sensor interfaces, with decades of expertise in radio-frequency baseband ICs.

The AK2363 belongs to Asahi Kasei's Radio Signaling LSI product line, designed specifically for legacy narrowband wireless systems requiring integrated MSK modulation and DTMF tone processing in compact, low-power form factors.

FAQ

What is the primary function of the AK2363?

The AK2363 is a dual-function radio signaling LSI that integrates an MSK modem (supporting 1200/2400 bit/s) and a DTMF receiver on a single chip. It performs baseband modulation/demodulation for telemetry links and decodes standard telephone-tone commands - all within a 24-pin QFNJ package. Its design targets legacy wireless infrastructure where compact size, low power, and protocol coexistence are essential.

Does the AK2363 require an external crystal oscillator?

No - the AK2363 includes a built-in 3.6864 MHz oscillator circuit requiring only an external 3.6864 MHz crystal connected between XIN and XOUT pins. Alternatively, it accepts external clock inputs at 7.3728 MHz, 11.0592 MHz, or 14.7456 MHz (2×/3×/4× multiples), which are internally divided by the DIV circuit to generate the required MCLK.

How is the MSK transmit data clocked into the AK2363?

The AK2363 reads MSK transmit data from the TDATA pin on the rising edge of the TCLK signal, which it outputs from its own TCLK pin. TCLK period is 417 µs (1200 bit/s) or 833 µs (2400 bit/s), controlled by the MSKSL register. TDATA must be stable for ≥1 µs before and after each TCLK rising edge to meet setup/hold timing requirements.

Can the AK2363 decode DTMF tones under low-signal conditions?

Yes - with AGC enabled, the AK2363 achieves a minimum detectable DTMF input level of –40 dBx at RXINO, significantly extending usable range compared to AGC-disabled operation (–27 dBx). This is achieved through automatic gain adjustment and programmable PGA settings, ensuring reliable tone recognition even with fading or attenuated signals.

What serial interface does the AK2363 use for register configuration?

The AK2363 uses a three-wire synchronous serial interface (CSN, SCLK, SDATA) with 14-cycle framing: 1-bit R/W, 4-bit address (A3–A0), and 8-bit data (D7–D0). Write operations require exactly 14 SCLK pulses while CSN is low; read operations use 5 pulses for address and 9 for data output. Software reset is triggered by writing 0xAA to the SRST register.