Product category: Communications ICs (Wireless)
News Release from: Maxim Integrated Products | Subject: MAX7030/MAX7031/MAX7032
Edited by the Electronicstalk Editorial Team on 26 April 2005
Transceivers take VCO and PLL parts on
chip
A new family of crystal-referenced VHF/UHF transceivers delivers more than +10dBm output power and -114 or -110dBm sensitivity.
New from Maxim Integrated Products, the MAX7030/MAX7031/MAX7032 family of crystal-referenced VHF/UHF transceivers delivers more than +10dBm output power and -114dBm (MAX7030/MAX7032 in ASK mode)/-110dBm (MAX7031/MAX7030 in FSK mode) sensitivity Housed in a small, 5 x 5mm, 32-pin TQFN package, these transceivers are perfect for low-cost, high-volume applications where space is critical
This article was originally published on Electronicstalk on 27 Aug 2002 at 8.00am (UK)
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The MAX7030 transmits and receives OOK/ASK data at a factory-set frequency in the 300 to 450MHz band with a datarate up to 66kbit/s NRZ, typical output power of +10dBm into a 50ohm load, and typical receive sensitivity of -114dBm.
This device has separate transmit and receive pins.
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An internal RF switch can be used to connect these transmit and receive pins to a common antenna.
The MAX7030 integrates a fractional-N PLL in its transmitter, and a fixed-N PLL in its receiver.
This hybrid architecture eliminates the need for separate transmit and receive crystal reference oscillators, because the fractional-N PLL allows the transmit frequency to be set close to the receive frequency with high precision.
The MAX7030's on-chip, 16bit, fractional-N PLL allows frequency multiplication of the low-frequency crystal to frequency steps of f(crystal)/4096.
Retaining the fixed-N PLL for the receiver avoids the higher current-drain requirements of a fractional-N PLL, hence keeping the receiver current drain as low as possible.
The MAX7030 is ready to power up and use with a small number of discrete components.
With all VCO and PLL parts on chip, the only key discrete components needed are a crystal and a 10.7MHz IF filter.
The baseband data-filter bandwidth can be set with two external capacitors.
ASK data of up to 66kbit/s NRZ can be transmitted/received after 250us from the enable command.
Similar to the MAX7030, the new MAX7031 transmits/receives FSK data at a factory-set frequency in the 300 to 450MHz band with a factory-set frequency deviation.
The MAX7031 has the same datarate and typical output power as the MAX7030, but its typical receive sensitivity is -110dBm.
The MAX7032 not only transmits/receives FSK data, but also OOK/ASK data in the 300MHz to 450MHz band with the same typical output power of +10dBm into a 50ohm load.
It has a typical receive sensitivity of -114dBm (ASK)/-110dBm (FSK).
Due to the fractional-N architecture of the MAX7032 transmit PLL, the transmit FSK signal can be programmed for exact frequency deviations.
Therefore, the problems associated with oscillator-pulling FSK signal generation are completely eliminated.
The MAX7032 is programmed through a three-wire SPI bus.
ASK or FSK data of up to 66kbit/s NRZ can be transmitted/received after 250 microseconds from the enable command.
The MAX7030/MAX7031/MAX7032 draw less than 7mA in receive mode, and less than 13mA in CW transmit mode.
All three devices operate over the automotive temperature range (-40 to +125C).
Prices start at $2.30 (10,000-up, FOB USA).
Evaluation kits are available to speed designs.
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