Low IF 1,5 Mbps transceiver chip

22 May 2002 Telecoms, Datacoms, Wireless, IoT

The ML2722 can be used as a single chip Direct Sequence Spread Spectrum (DSSS) transceiver or general purpose Frequency Shift Keying (FSK) radio transceiver. This Micro Linear device is designed to work in the 902 to 928 MHz ISM band. The device integrates all the frequency generation, receive and transmit functions for data rates up to 1,5 Mbps or for DSSS at 1,5 Mbps. A complete radio only requires the addition of a RX/TX switch.

The ML2722 contains a proprietary low IF receiver with all filters integrated. An image reject mixer brings the 915 MHz RF signal down to a low IF frequency of 1,024 MHz. All IF filtering, IF gain, and demodulation is then performed at 1 MHz. This architecture provides all the benefits of direct conversion to baseband, and reduces the need for RF filtering. The ML2722 can operate with either a low-cost LC or SAW RF filter.

A single 1,83 GHz synthesizer is used for both the receiver LO and the transmitter. The ML2722 transmitter modulates the VCO with filtered data, and a drive amplifier provides typically 0 dBm at 915 MHz. The VCO and PLL incorporate the resonator, the active devices, and the tuning circuitry for a completely integrated function. An internal receive data filter and data slicer are integrated.

The ML2722 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 (Receiver Signal Strength Indication).

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