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UHF ASK/FSK receiver ICs suit RKE, TPMS apps

Posted: 17 Sep 2007 ?? ?Print Version ?Bookmark and Share

Keywords:UHF ASK/FSK receiver IC? RKE application? automotive RF device?

Atmel Corp. has extended its broad portfolio of automotive RF devices with the release of ATA5723, ATA5724, and ATA5728 UHF ASK/FSK receiver ICs, claimed to offer the best compromise between high integration, outstanding performance, and worldwide frequency coverage.

The devices are manufactured using Atmel's RF BiCMOS process and are suitable for remote keyless entry (RKE) and tire pressure monitoring system (TPMS) applications.

The three new ICs are pin compatible, which means they can be used, without board design changes, for all standard automotive frequency ranges313- to 317MHz (ATA5723), 432- to 436MHz (ATA5724), and 868- to 870MHz (ATA5728).

The ATA5723, ATA5724, and ATA5728 support the typically used Manchester and Bi-phase coding signals. They also provide a logarithmic RSSI output, which enables customers to achieve good resolution at low field strengths. The ICs' receiving selectivity is accomplished by an integrated image rejection mixer with 30dB rejection, -113dBm sensitivity, and improved selectivity due to the integrated IF filter, low-phase-noise VCO, PLL, and loop filter.

The new receiver ICs need few external devices and no external filtersadding to their cost-efficiency. Ten passive components, a crystal, and an RF antenna are all that is typically needed to create a receiver board application. Additionally, due to the ICs' large oscillation margin, designers can choose very low-cost crystals.

The ATA5723, ATA5724, and ATA5728 are based on Atmel's well-known ATA5743, which has set a worldwide standard with its unique polling mode functionality. As a result, the devices' polling features allows the microcontroller to remain in standby mode, enabling very low current consumption for complete applications. The active current consumption is specified at about 8mA in receiving mode. The single-ended RF input allows easy adaptation of lambda/4 or printed loop antennas and leads to relaxed tolerance requirements for RF matching components.

Samples of the ATA5723/ATA5724/ATA5728 are now available in SSO20 packages. Pricing starts at $2.95 for 10,000-piece quantities. Customers of the three new receivers ICs can use the software currently available for the ATA5743. Evaluation boards, ATA5723-DK, ATA5724-DK and ATA5728-DK, to support the system designer are also available for $131.

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