2,4 GHZ low IF 1,5 Mbps transceiver
14 August 2002
Telecoms, Datacoms, Wireless, IoT
The ML2725 from Micro Linear can be used as a single chip direct sequence spread spectrum (DSSS) telephone transceiver or general purpose frequency shift keying (FSK) radio transceiver. It is designed to work in frequency ranges of 2,4 GHz. The device integrates the frequency generation, receive and transmit functions for data rates up to 1,5 Mbps.
The ML2725 contains a proprietary dual conversion low IF receiver with all channel selectivity. The first mixer converts the 2,4 GHz RF input signal to a high IF of 800 MHz. An image reject mixer brings the 800 MHz IF signal down to a low IF frequency of 1,024 MHz, so all IF filtering, IF gain, and demodulation is performed at 1,024 MHz. This provides all the benefits of direct conversion to baseband and minimises the need for RF filtering. Also, the ML2725 can operate with either a low cost LC filter or a SAW filter.
A single 1,6 GHz synthesizer is used for both the receiver LO and the transmitter signal generation. The VCO and PLL are completely integrated, including the VCO resonator and tuning circuits. On transmit, the ML2725 is intended to be used with an external frequency tripler. The transmit output frequency is nominally 800 MHz, with a typical output power of 0 dBm. Transmit data is used to frequency modulate the VCO with the synthesizer open loop. The transmit data filter and modulation compensation circuits are also integrated.
The ML2725 contains its own DC regulation which allows the IC to operate over a wide power supply voltage range. It also has a simple baseband interface for transmit power management, PLL control and detection, and RSSI.
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