Atmel's ATA5745 and ATA5746 UHF ASK/FSK receiver ICs are single-chip devices manufactured using Atmel's new RF BiCMOS process, which enables very small designs. The ATA5745 operates at 433 to 435 MHz, whereas the ATA5746 covers the 313 to 315 MHz frequency band for the standard automotive environment. With a size of 5 x 5 mm, they are well-suited for remote keyless entry (RKE) and tyre pressure monitoring system (TPMS) applications.
With the help of fully-integrated filters, these devices provide a good combination of large bandwidth and superior receiving selectivity. According to the company, this allows system designers to develop a broad range of TPMS and RKE solutions, ranging from highly sophisticated to very low cost, whereas industry-standard solutions cannot be used for such low-cost systems due to their smaller bandwidth. The receiver ICs need few external devices and no external filters, which adds to their cost-efficiency. Eight passive components, a crystal, and an RF antenna are typically all that is needed to create a receiver board application. The ICs also have a large oscillation margin, so designers can apply very low-cost crystals.
Due to their fast switching capability between TPMS and RKE signals, the ATA5745 and ATA5746 devices can also be used in unified RKE/TPMS automotive application environments with different system definitions. This eliminates the need for two separate RKE and TPMS ICs. The ICs' ability to change the modulation type between ASK and FSK, and between data rates without component changes, is important when receiving different RKE/TPMS modulation schemes and data rates. They can be operated in 1 to 20 Kbps Manchester FSK mode with four different baud rate ranges, selectable through the microcontroller without any hardware modification on board. The typical switching between modulation types ASK/FSK and different data rates is possible in less than 1 ms.
Offered in QFN24 packages, active current consumption is about 6,5 mA in receiving mode and is based on single-ended RF input for easy adaptation of ¼-wave or printed loop antennas.
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