The AK2404 is a direct conversion transceiver IC that realizes high-performance narrowband wireless communication. The receiver section incorporates an LNA, quadrature demodulator, PGA, 24bit ΔΣ A/D Converter, and digital filter to provide a receiver with high sensitivity and high interference immunity without the use of ceramic or SAW filter. In particular, the blocking characteristics of Δ 10MHz are over 100dB (Standard: TIA603, EN 300 0861-1). The digital filter with variable bandwidth supports channel selection for multiple different wireless systems, enabling easy system design in wireless platforms. In addition, a ΔΣ fractional N PLL synthesizer is incorporated to configure high -performance PLLs with an external VCO. The transmitter has a built-in DAC and driver amplifier. The compact QFN Package of 8mm square contributes to the miniaturization of radio equipment.

• ◼ Features

• Operating Frequency: 45MHz to 960MH

• Power Supply: 2.7 to 3.45V (IOVDD: 1.7 to 1.9V also used 2.7 to 3.45V)

• Operational Temperature: -40 to +85°C

• LNA, Attenuator (ATT) and PDET for interference detection

• Automatic PGA gain control function for high dynamic range

• High Linearity Direct Conversion I/Q Demodulator

• 24-bit ΔΣ A/D Converter: up to 192kHz Output Sampling Rate (TCXO=24.576MHz)

• Band Changeable Digital Filter (The FIR filter coefficients can be set arbitrarily)

• RSSI Functions: Data read by SPI and Analog voltage output

• FM Detection Circuit and Noise Squelch Function

• Support Zero IF and Very Low IF architecture

• DC Offset Cancelation: Real-time DC Offset Canceller (RDOC) Function and HPF

• 23- bit ΔΣ Fractional -N PLL Synthesizer

• Modulation data input interface suitable for 2-point modulation for FM/FSK applications

• 12-bit D/A Converter: 96kHz Max. Sampling Rate, S/N 72dB

• Transmission Drive Amplifier: -10 to +2dBm Output

• Local Signal Dividing Circuit and Poly Phase Filter

• TCXO Frequency: 18.432MHz / 19.2MHz / 24.576MHz recommended

• Clock Rate Converter

• Package: 68-pin QFN (8×8mm, 0.4 mm pitch)

• ◼ Applications

• Narrow Band Radio Communications: 6.25kHz / 7.5kHz / 12.5kHz / 15kHz / 20kHz / 25kHz etc.

• Modulation Method: FM / 2FSK/ 4FSK / QPSK / /4 DQPSK / 16QAM

(The demodulation needs to be externally executed except the FM modulation.)

• Analog/Digital Dual Mode Transceiver

• Digital Radio System for Industrial Use

• Public Safety and Community/Emergence Radio System

• Convenience Transceiver

• Marine/Mobile Communication System

• Low power / Telemeter Transmitter

• Amateur Radio System

220900015-E-04 2023/04

• ◼ Features

• Operating Frequency: 45MHz to 960MH

• Power Supply: 2.7 to 3.45V (IOVDD: 1.7 to 1.9V also used 2.7 to 3.45V)

• Operational Temperature: -40 to +85°C

• LNA, Attenuator (ATT) and PDET for interference detection

• Automatic PGA gain control function for high dynamic range

• High Linearity Direct Conversion I/Q Demodulator

• 24-bit ΔΣ A/D Converter: up to 192kHz Output Sampling Rate (TCXO=24.576MHz)

• Band Changeable Digital Filter (The FIR filter coefficients can be set arbitrarily)

• RSSI Functions: Data read by SPI and Analog voltage output

• FM Detection Circuit and Noise Squelch Function

• Support Zero IF and Very Low IF architecture

• DC Offset Cancelation: Real-time DC Offset Canceller (RDOC) Function and HPF

• 23- bit ΔΣ Fractional -N PLL Synthesizer

• Modulation data input interface suitable for 2-point modulation for FM/FSK applications

• 12-bit D/A Converter: 96kHz Max. Sampling Rate, S/N 72dB

• Transmission Drive Amplifier: -10 to +2dBm Output

• Local Signal Dividing Circuit and Poly Phase Filter

• TCXO Frequency: 18.432MHz / 19.2MHz / 24.576MHz recommended

• Clock Rate Converter

• Package: 68-pin QFN (8×8mm, 0.4 mm pitch)

• ◼ Applications

• Narrow Band Radio Communications: 6.25kHz / 7.5kHz / 12.5kHz / 15kHz / 20kHz / 25kHz etc.

• Modulation Method: FM / 2FSK/ 4FSK / QPSK / /4 DQPSK / 16QAM

(The demodulation needs to be externally executed except the FM modulation.)

• Analog/Digital Dual Mode Transceiver

• Digital Radio System for Industrial Use

• Public Safety and Community/Emergence Radio System

• Convenience Transceiver

• Marine/Mobile Communication System

• Low power / Telemeter Transmitter

• Amateur Radio System

220900015-E-04 2023/04

AK2404 Pinout – 68-VFQFN Exposed Pad

Notes

• Pin 31 and 39 are marked NC (No Connect) in the diagram.
• Pins 41–42 and 47–48 appear to have duplicate names in the source diagram; verify actual function in detailed pin descriptions section of datasheet.
• The exposed pad (EP) on the back side should be connected to ground or thermal management as specified in the thermal design section.
• VSS (pins 17, 35, 55, 68) are ground connections; DVSS is digital ground, ADVSS is analog-digital ground, PLLVSS is PLL ground.