News Release

- New Product Information -

2017/04/21
AKM releases a Direct Conversion Transceiver IC; the AK2401 integrates a newly developed DC offset cancellation function for narrow band radio communication

Product Name
AK2401
(Products: Two-Way Radio ICs)
Title
Direct Conversion Transceiver IC for Narrow Band Radio Communication
Applications
Narrow Band Radio Communication: 6.25kHz / 7.5kHz / 12.5kHz / 15kHz / 20kHz / 25kHz / 50kHz / 100kHz / 150kHz / etc.
AK2401
AK2401

Description

Recently, commercial and public safety radios are becoming more multifunctional as it is shifting from analog to digital radio.  In order to integrate various sensors into a digital radio, the market demand for minimizing PCB size is increasing.  On the other hand, commercial and public safety radios require high selectivity, high linearity and high tolerance to spurious signals, still consisting of many discrete parts.
Asahi Kasei Microdevices Corporation, (AKM), has developed a transceiver IC, the AK2401, that integrates multiple components and provides high performance narrow-band radio communication.  The AK2401 adopts direct conversion architecture which is advantageous for integration rather than the double superheterodyne architecture which was previously mainstream.  This helps to miniaturize radio equipment.  Moreover, a newly developed, "RDOC", (Real-time DC Offset Canceller), function achieves no characteristic deterioration due to DC offsets, (static or dynamic), which was a challenge for direct conversion architecture.
The receiver block of the AK2401 integrates an LNA, I/Q demodulator, PGA, and a 24-bit delta-sigma ADC.  This achieves both high performance sensitivity and high tolerance to adjacent channel interference, intermodulation, and blocking.  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 12-bit DAC and a driver amplifier.

● Newly Developed RDOC, (Real-time DC Offset Cancellation), Function

A major challenge in applying the direct conversion architecture to high-performance narrowband radio communication was in DC offset cancellation.  Generally, when applying the high pass filter used for the direct conversion architecture to the narrowband radio, degradation of signal quality due to the loss of the signal component cannot be ignored.  Therefore, AKM developed a proprietary technology that removes the DC offset in real time in response to changes in the surrounding radio wave environment, which is completely separate from the high pass filter.  RDOC is performed internally and automatically with no requirement for external DSP programming.  This will be more effective in an environment with low signal level, and contribute to the improvement of signal quality, (Bit Error Rate).

● Programmable Digital Channel Filter (75-TAP FIR Filter)

In addition to ten kinds of standard channel filters for Pass Band ranging from 2kHz to 60kHz, an FIR filter that can program arbitrary coefficients is available.  A digital filter that’s able to change the bandwidth supports channel selection for multiple radio systems, enabling simple system designing for a radio platform.

Specifications

AK2401
AK2401
Direct Conversion Transceiver IC for Narrow Band Radio Communication
Operating Frequency[MHz]30 to 1200
LNA
Gain: 15dB,  NF: 1.2dB,  IIP3: +7dBm
Direct Conversion I/Q Demodulator
Gain: 42dB,  NF: 16dB,  IIP3: +19dBm
24-bit ΔΣ A/D Converter
Output Sampling Frequency:150kHz Max. (TCXO: 19.2MHz)
Variable Bandwidth Digital Filter
Bandwidth can be set arbitrarily
Function
Automatic Gain Control (AGC) function for LNA and PGA
Real-time DC Offset Canceller (RDOC)
RSSI: Data read by SPI communication
12-bit D/A Converter

Sampling Frequency: 200kHz Max,  S/N: 72dB
Transmission Driver Amplifier Output[dBm]-6 to +6
Local Signal Dividing Circuit
Divide by 2 or more is recommended
TCXO Frequency
18.432 / 19.2 MHz are recommended
Power Supply[V]VDD1: 2.7 to 3.3
CPVDD: 2.7 to 5.5
DACVDD: 2.7 to 5.5
Operation Temperature[°C]-40 to 85
Package
52-pin QFN  (7 x 7 x 0.85mm, 0.4mm pitch)
[Notes]
* AKM is a trademark of Asahi Kasei Microdevices Corporation in Japan, Europe and the United States.

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