Direct Conversion Transceiver

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Two-way Radio ICs
The AK2401A is a direct conversion transceiver that provides high performance narrow-band radio communication. The receiver block of the AK2401A 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 AK2401A 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 AK2401A is housed in a small QFN package (7mm x 7mm), realizing to downsize wire-less applications.

Key Features

● No requirement for DSP programming for the DC offset in direct conversion system

The DC offset is normally removed by the DSP in direct conversion. The AK2410A does not need external DSP programming for the DC offset since the integrated RDOC automatically eliminates the DC offset in real time. This is more effective in severe radio environments, improving the signal quality, (Bit Error Rate).

● Support channel selection for multiple radio systems

The programmable FIR filter is integrated in addition to ten kinds of standard channel filters with passband ranging from 2kHz to 60kHz. This variable bandwidth digital filter enables multi-platform system designs.

● Improved characteristics compared to conventional products

Low Power Consumption: Reduced RX current consumption by 10% (typ. 52mA) *1
High Blocking Performance: 3dB higher blocking performance (typ. 96dB)*2

Main Specifications

Operating Frequencyfrom 29MHz to 1200MHz
LNAGain 15dB, NF 1.2dB, IIP3 +7dBm
Direct Conversion I/Q Demodulator
Gain 42dB, NF 16dB, IIP3 +19dBm
24-bit ΔΣ A/D ConverterUp to 150kHz Output Sampling Frequency
Band Changeable Digital FilterBandwidth 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 DAC200kHz Max. Sampling Frequency, S/N 72dB
Transmission Driver Amplifier−6 to +6 dBm Output
Local Signal Dividing CircuitDivide by 2, 4, 8
TCXO Frequency18.432MHz / 19.2MHz are recommended
Package52-pin QFN (7×7×0.85mm 0.4 mm pitch)
Sales StatusSampling

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Block Diagram

Block Diagram

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