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RF ICs for car access systems tout sensitivity, efficiency

Posted: 26 Oct 2010 ?? ?Print Version ?Bookmark and Share

Keywords:RF? transceiver? automotive? access?

Atmel Corp. introduced its ATA5830 and ATA5780 monolithic RF transceiver and RF receiver devices touting sensitivity and efficient power consumption. These multiband devices are made for the ISM frequency bands in the ranges of 310- to 318MHz, 418- to 477MHz, and 836- to 928MHz. The devices were designed to suit automotive remote keyless entry (RKE), remote start, passive entry go (PEG), and tire pressure monitoring systems (TPMS).

These monolithic devices merge an RF receiver or transceiver block with an Atmel AVR microcontroller core. In turn, this allows devices to poll multiple application channels to support, for example, the RKE/PEG, Remote Start and TPMS system with a single IC; thus, eliminating the requirement for multiple ICs.

Furthermore, the ATA5830 and ATA5780 are pin-compatible devices to ensuring optimal reuse of development effort for 1-way and 2-way systems. Based on this pin-compatibility offering, the printed circuit board design may be the same for both the unidirectional and bidirectional car access system, which is a unique selling point in regards to variants, stock of replacement parts and cost savings.

According to Atmel, these �highly sensitive? devices (typical -109dBm, 10kBps Manchester data rate, FSK modulation with +/-10kHz frequency deviation, IF bandwidth 165kHz) offer a high image rejection and excellent blocking performance (typical 64dBc at 1MHz, IF bandwidth of 165kHz) for the multiple customer applications. The transceiver's maximum power-down current of 600nA insures that customers will realize maximum battery life, while keeping battery size to a minimum.

The Atmel ATA5830 and ATA5780 are available in a compact 5x5 mm QFN32 package. They are priced at $2.70 (ATA5830) and $1.50 (ATA5780) in 50,000-unit quantities. Samples of both ICs are currently available.

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