Product category:
Communications ICs (Wireless)
News Release from: Melexis | Subject: TH720x5
Edited by the Electronicstalk Editorial
Team on 17 November 2003
PLL-based transmitters shrink into MLPs
A new range of low-power radio transmitter chips covering frequencies from 300 to 930MHz are the first devices of their type to be produced in the very tiny micro leadframe package.
A new range of low-power radio transmitter chips covering frequencies from 300 to 930MHz are the first devices of their type to be produced in the very tiny MLP package The TH720x5 family from Melexis enable designers to perfectly match their system requirements by each application's frequency range, modulation scheme and output power requirement
This article was originally published on Electronicstalk on 17 Oct 2003 at 8.00am (UK)
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The transmitters come in a space-saving 10 lead micro leadframe package (MLP) with a footprint of only 3 x 3mm.
Compared with other solutions on the market, Melexis' ICs do not require external components to set up the PLL loop filter or the VCO.
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The TH720x5 ICs accept inputs from 1.9 to 5.5V.
Power consumption ranges from 3.5 to 14mA depending on the frequency and power setting.
In standby mode the current consumption is less than 50nA.
The programmable RF transmit power range between -12 and 10dBm allows the designer to adapt the device to different RF power requirements.
These single-channel transmitter devices vary in frequency range to allow optimised performance over their bandwidth: TH72005 for 290 to 350MHz, TH72015 for 380 to 450MHz and TH72035 for 850 to 930MHz.
All three devices can be tuned in FSK, ASK or FM.
The TH720x5 transmitter ICs combine flexibility with high levels of circuit complexity.
Compared with a SAW-based solution, the TH720x5 PLL-based transmitters offer substantially more frequency stability.
At the same time they can be easily reconfigured for another output frequency just by changing the crystal frequency.
SAW transmitters, on the other hand, are limited because they are only available for fixed operating frequencies.
Dr Andreas Laute, Manager of Melexis' Business Unit Wireless Communication, explains: "The primary goal in the development of all new transmitter, receiver, and transceiver products is to simplify design for the RF system engineers.
We not only want to provide them with superior performance and design flexibility, but we want to do so across all popular non-licensed RF spectrums and other low-power broadcast formats".
Typical applications for the TH720x5 transmitter IC family include security systems, home automation, garage door openers, wireless doorbells and baby monitors.
The extended operating temperature range of -40 to +125C makes the parts ideally fit for automotive applications such as remote keyless entry (RKE), tyre pressure monitoring systems (TPMS), car alarm systems etc.
The new TH720x5 transmitter IC line completes the existing TH720xx family of transmitters which is housed in the widely used SOIC8 package.
The parts can be used in virtually any FSK, ASK or FM system where the designer wants to eliminate wired hardware to form a completely wireless communications link.
Melexis also offers corresponding receiver chips to complete the system.
In quantities of 100,000, cost per unit for the TH72005, TH72015 or TH72035 is Eur 0.56.
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