product focus integrated subsystems
2.4 GHz spread spectrum transceiver
AeroComm announces the release of a line of LX 2.4 GHz frequency-hopping spread spectrum (FHSS) transceivers. LX transceivers are agency-approved, ready-to-use modules designed for rapid integration into larger volume OEM products. Five versions of transceivers and two repeater models are available. Manufacturers can choose short-range, low-power versions for battery-powered or piconet applications, and higher-power radios coupled with repeaters for miles of range. With RF data rates up to 244 Kb/s, and 3 mW for local uses (within 50 feet), it reaches 150mW for miles of longer range applications. LX transceivers are available with integral strip dipole antennas for applications not permitting external antennas. Radios with antenna connectors are also available for use with a variety of agency external antennas.
Hittite Microwave introduces a multifunction RFIC component, the HMC310MS8G. The device incorporates a power amplifier and low-noise amplifier with a transmit/receive switch. The device is designed for applications in the 2.4 GHz ISM band including HomeRF, Bluetooth, and low-power wireless local area network (WLAN) radios. It offers 14 dB of gain and +6 dBm P1dB in the transmit mode. Its 14 dB of gain is rated with an overall noise figure of 2.7 dB when in receive mode. This low-current, transceiver requires no external circuitry to operate the amplifier power down features and is available in the industry standard MSOP8G package.
Five-watt attenuators for DC to 18 GHz
RF Micro Devices announces the RF2485 quadrature modulator for terrestrial trunked radio (TETRA) systems. Designed for TETRA use in the 200 to 600 MHz band, the RF2485 features a broadband noise floor of -149 dBm/Hz typical at 5 MHz offset along with ACPR of -48 dBc typical at 25 kHz. The device operates from a single 5VDC power supply and contains all of the required components to implement the modulation function. Included are differential amplifiers for the baseband inputs, a 90 degree hybrid phase splitter, limiting LO amplifiers, two balanced mixers, a combining amplifier and an output RF amplifier which will drive a 50Ω load.
Typical applications for the RF2485 include digital and spread spectrum systems; GMSK, QPSK, DQPSK and QAM modulation; private mobile radio and TETRA systems; AM, SSB, DSB modulation and image-reject up-converters.
RF Micro Devices
Ultra low current downconverter
M/A-COM announces a low-cost, highly linear IC downconverter for use in cellular band, CDMA handsets and other battery-operated RF systems. This device integrates a switched LNA, mixer, and several buffer amplifiers in a miniature 4 mm WLF package. The IC features an on-board LNA and bypass switch for gain control, a mixer with LO buffer and RF input amplifier, and single-ended and differential mixer output buffers. Based on enhancement-depletion gallium arsenide (ElD) MESFET technology, the IC draws lower current than typical SiGe ICs, which typically draw 25 mA or more. The small size, low cost, linearity, and low current draw make this IC a candidate for lightweight, battery-operated, handsets and portable systems. The MD59-0043 operates with an RF output frequency between 800 and 900 MHz. The device has a low noise figure, 2.3 dB, very low current draw, 20 mA (16 mA in low gain mode), a conversion gain of 28 dB, and an input IP3 of -10 dBm, typically. The device requires an LO signal of -6 dBm.
EMI/RFI flexible conduit
The RF9600 is now available on the new MURS frequencies. These five VHF channels are available for use by almost anyone and no license is required. The Mt.JRS radio modem is capable of 9600 baud, has error correction, robust reliability, and comes pre-programmed with all five frequencies. Each station may have its own ID code to ensure that it responds to commands. Units will work well with many commercial weather stations, as well as the less-expensive home variety. Neulink radio modems are available on VHF, UHF, and 2.4 GHz frequencies.
Three-volt TX/RX RS-232 serial devices
Intersil introduces a new family of VDC RS-232 transmitters-receivers that operate as the serial interface port for such portable battery-operated appliances as cellular phones, digital cameras, personal digital assistants and palmtops. The JCL32xx RS-232 devices are five-driver, three-receiver transceivers that support data rates of 250 kbps, and are fully compatible with 3.3 VDC-only systems, mixed 3.3 VDC and 5.OVDC systems, and 5.O VDC-only systems. The new devices offer 15 kV electrostatic discharge (ESD) circuit protection to protect the exposed RS-232 pins from ESD damage. The 3V family of products requires 0.3 mA of supply current during normal operation. The devices feature manual, automatic and enhanced automatic power-down features that reduce standby supply current. These features can shut down the on-chip power supply and simultaneously disable the transmitter outputs that also result in a reduction of standby current. Automatic power-down function activates when an RS-232 cable is disconnected or when the peripheral driving the device powers down. The device powers up immediately after detecting a valid RS-232 level on any receiver input, such as when the cable is reconnected.
PMC-based DSP I/O card
A high-performance, integrated PMC-based 110 card has been announced by Ixthos. The PMC ENET-1 card includes integrated I/O and DSP hardware and software solutions for wireless digital radio/programmable software receivers, semiconductor fabrication and test equipment, sonar/imaging, telecommunications and networking, as well as high-speed serial interconnect fabric and networking. The card provides Ethernet and serial ports on a single PMC card for use in 3.3 VDC or 5.O VDC PCI signaling environments. A flexible stacking option allows for another PMC module to be “piggybacked” onto the ENET-1 during development.
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