SANTA CLARA, Calif. National Semiconductor Corp. has launched a highly integrated transceiver for the 2.4-GHz ISM band. The LMX3162-one of the first single-chip RF transceivers for that frequency-is geared toward high-volume, low-power applications like HomeRF networks, Bluetooth office systems and in-office wireless LANs using frequency-hopping spread-spectrum connection techniques.
National believes that next to 900-MHz analog cordless telephony, interest and products in the 2.4-GHz space will grow the fastest, representing 15 percent of the cordless-phone sets shipped in 2002.
The LX3162 is a BiCMOS part that integrates a radio front end, 1.3-GHz phase-locked loop, 2.4-GHz frequency doubler, low-noise amplifier, high-frequency buffer and 2.4-GHz low-noise mixer. Also on-chip are intermediate-frequency and high-gain-limiting amplifiers, a frequency discriminator, received-signal-strength indicator (RSSI) and analog dc compensation loop. A GaAs transmitter, LNA and external ceramic filter would be needed to complete the transceiver.
The LMX3162 has an RF sensitivity of -93 dBm. RSSI sensitivity is -100 dBm. The part provides two regulated voltage outputs (including a negative voltage rail) for discrete transistor transmitters and receivers (usually GaAs). Even with an 85-dB gain, system noise is around 6.5 dB.
National's 2.4-GHz transceiver chip, in fact, builds on the company's experience in DECT. The LMX3162 can be coupled with an SC14402 for DECT handsets, or with an SC14422 integrated baseband processor to provide echo cancellation for DECT basestations. DECT protocols are used for voice on HomeRF networks.
The device was shown at the recent Penton Wireless Symposium/Portable by Design conference.
The LMX3162 comes in a 48-pin plastic quad flat pack and is priced at $5.60 each in 1,000-piece lots. Reference designs for DECT and other protocols are available.
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EETInfo No. 631