ATAB5757 Microchip

ATA5756/ATA5757 UHF ASK/FSK Transmitter DATASHEET Features PLL transmitter IC with single-ended output High output power (6dBm) at 8.1mA (315MHz) and 8.5mA (433MHz) typical values Divide by 24 (Atmel ATA5756) and 32 (Atmel ATA5757) blocks for 13MHz crystal frequencies and for Low XTO start-up times Modulation scheme ASK/FSK with internal FSK switch Up to 20kBaud manchester coding, up to 40kBaud NRZ coding Power-down idle and power-up modes to adjust corresponding current consumption through ASK/FSK/enable input pins ENABLE input for parallel usage of controlling pins in a 3-wire bus system CLK output switches ON if the crystal current amplitude has reached 35% to 80% of its final value Crystal oscillator time until CLK output is activated, typically 0.6ms Supply voltage 2.0V to 3.6V in operation temperature range of 40C to +125C ESD protection at all pins (4kV HBM) Small package TSSOP10 Benefits Low parasitic FSK switch integrated Very short and reproducible time to transmit typically < 0.85ms 13.125MHz/13.56MHz crystals give opportunity for small package sizes 4702M-RKE-09/151. Description The Atmel ATA5756/ATA5757 is a PLL transmitter IC which has been developed for the demands of RF low-cost transmission systems at data rates up to 20kBaud Manchester coding and 40kBaud NRZ coding. The transmitting frequency range is 313MHz to 317MHz (Atmel ATA5756) and 432MHz to 448MHz (Atmel ATA5757), respectively. It can be used in both FSK and ASK systems. Due to its shorten crystal oscillator settling time it is well suited for Tire Pressure Monitoring (TPM) and for Passive Entry Go applications. Figure 1-1. System Block Diagram UHF ASK/FSK UHF ASK/FSK TPM and Remote control Remote control receiver transmitter 1 Li cell U3741B/ ATA5756/ U3745B/ 1 to 3 Micro- ATA5757 T5743/ Demod Control controller T5744 Encoder PLL ATARx9x Keys Antenna Antenna XTO VCO PLL XTO Power LNA VCO amp. 2 ATA5756/ATA5757 DATASHEET 4702MRKE09/15