Product category:
Communications ICs (Wireless)
News Release from: Melexis | Subject: MLX71121
Edited by the Electronicstalk Editorial
Team on 16 November 2006
RF receiver qualifies for automotive
duties
The new MLX71121 RF receiver IC is tailored to low-power and low-cost fixed frequency applications.
The MLX71121 is the second member of a new highly integrated RF receiver family from Melexis This new automotive qualified IC with dual RF input has been specifically designed for low cost antenna diversity applications in the unlicensed industrial-scientific-medical (ISM) and short-range-devices (SRD) frequency bands
This article was originally published on Electronicstalk on 6 Nov 2007 at 8.00am (UK)
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The new MLX71121 RF receiver IC is tailored to low-power and low-cost fixed frequency applications.
It can address the European 863-870MHz SRD bands or the ISM bands at 902-928MHz in North America.
It is also capable of covering the lower frequency bands of 315 and 433MHz.
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Manufacturers of worldwide equipment for automotive remote keyless entry (RKE) and tyre pressure monitoring systems (TPMS) as well as consumer and industrial system makers benefit through the simplification of their production logistics and the indirect reduction in cost.
The only significant external component that needs to be changed to adapt the system for different application frequencies is a crystal.
One of the outstanding features of the MLX71121 is its dual RF input.
This allows the user to very easily set up an antenna diversity system previously found only in high-end wireless systems.
This can significantly improve the reliability of the RF communications link by selecting the RF input which provides the best signal quality, The small 32 lead QFN package with a footprint of 5 x 5mm and an internal IF filter and discriminator make the MLX71121 the optimum choice for systems requiring the smallest sise and lowest cost.
The MLX71121 operates over a wide supply voltage range from 2.1 to 5.5V with a typical current consumption of 7 to 9.6mA.
In standby mode the current draw is below 50nA.
The receiver input sensitivity is as low as -114dBm for ASK and -104dBm for FSK signals, respectively.
If needed receiver sensitivities can be improved further by placing the two low-noise amplifiers of the dual RF input in cascade.
The MLX71121 combines flexibility with high levels of circuit complexity.
It dramatically reduces system cost thanks to the internal IF filter and FM/FSK demodulator.
The receiver's AFC feature can tolerate large frequency errors of the input signal.
Dr Andreas Laute, Manager of Melexis' Business Unit Wireless Communication, stated: "With the introduction of the second device of our new highly integrated RF receiver family, we provide a tool for our customers to ease the development of state-of-the-art receiver systems".
"The MLX71121 with its antenna diversity feature will be a revolution in the low-cost RF receiver segment".
The extended operating temperature range of -40 to +125C makes the part ideally fit for automotive applications such as RKE, TPMS or car alarm systems.
Other typical applications for the MLX71121 include security systems, home automation, garage door openers, wireless door bells, baby monitors and wireless headsets.
In quantities of 100,000, cost per unit for the MLX71121 is Eur 1.16.
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