AK2401

Direct Conversion Transceiver

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Description

Two-way Radio ICs
The AK2401 is a direct conversion transceiver that provides high performance narrow-band radio communication. The receiver block of the AK2401 integrates a LNA, I/Q demodulator, PGA and 24-bit delta-sigma ADC, and realizes both performances of high sensitivity and high tolerance to adjacent channel interference, intermodulation and blocking. Digital filter that is able to support channel selection for multiple radio systems, enabling simple system designing for a radio platform. The AK2401 also integrates a delta-sigma Fractional-N synthesizer that composes a high performance PLL with an external VCO. The transmission block has a DAC and a driver amplifier. The AK2401 is housed in a small QFN package (7mm x 7mm), realizing to downsize wire-less applications.

Key Features

•    Operating Frequency: 30MHz ~ 1200MHz
•    Power Supply: 2.7 ~ 3.3V (CPVDD, DACVDD: 2.7 ~ 5.5V)
•    Operational Temperature: -40 ~ +85ºC
•    LNA: Gain 15dB, NF 1.2dB, IIP3 +7dBm
•    High Linearity Direct Conversion I/Q Demodulator
•    24-bit ΔΣ A/D Converter: up to 150kHz Output Sampling Frequency (TCXO=19.2MHz)
•    Band Changeable Digital Filter (Bandwidth can be set arbitrarily)
•    Automatic Gain Control (AGC) function for LNA and PGA
•    Real-time DC Offset Canceller (RDOC) Function
•    RSSI Function: Data read by SPI communication
•    18-bit ΔΣ Fractional-N PLL Synthesizer
•    Digital Frequency Modulation (FM/FSK) by Frequency Offset Function
•    Fast Lock Function reduces Lock-up Time
•    12-bit DAC: 200kHz Max. Sampling Frequency, S/N 72dB
•    Transmission Driver Amplifier: −6 ~ +6 dBm Output
•    Local Signal Dividing Circuit (divide by 2 or more is recommended)
•    TCXO Frequency: 18.432MHz / 19.2MHz are recommended
•    Frequency: 52-pin QFN (7×7×0.85mm 0.4 mm pitch)

Applications
• Narrow Band Radio Communication: 6.25kHz/7.5kHz/12.5kHz/15kHz/20kHz/25kHz/
                                                        50kHz/100kHz/150kHz/etc.
• Modulation Method: FM/ 2FSK/ 4FSK/ QPSK/ pi/4 DQPSK / 16QAM/ 64QAM
  (Modulation / demodulation needs to be done externally. Modem function is not installed.)
• Analog/Digital Dual Mode Transceiver
• Digital Radio System for Industrial Use
• Public safety and Community/Emergency Radio System
• Convenience Transceiver
• Marine/Mobile Communication System
• Low power / Telemeter Transmitter
• Amateur Radio System

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Block Diagram

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