ATA5749-EK2 Microchip

ATA5749/ATA5749C Fractional-N PLL Transmitter IC DATASHEET Features Fully integrated fractional-N PLL ASK and closed loop FSK modulation Output power up to +12.5dBm from 300MHz to 450MHz Current consumption is scaled by output power programming Fast crystal oscillator start-up time of typically 200s Low current consumption of typically 7.3mA at 5.5dBm Only one 13.0000MHz crystal for 314.1MHz to 329.5MHz and 424.5MHz to 439.9MHz operation Single ended RF power amplifier output Many software programmable options using SPI Output power from 0.5dBm to +12.5dBm RF frequency from 300MHz to 450MHz with different crystals FSK deviation with 396Hz resolution CLK output frequency 3.25MHz or 1.625MHz Data rate up to 40kbit/s (Manchester) 4KV HBM ESD protection including XTO Operating temperature range of 40C to +125C Supply voltage range of 1.9V to 3.6V TSSOP10 package Benefits Robust crystal oscillator with fast start up and high reliability Lower inventory costs and reduced part number proliferation Longer battery lifetime Supports multi-channel operation Wide tolerance crystal possible with PLL software compensation 9128J-RKE-07/151. Description The Atmel ATA5749 is a fractional-N-PLL transmitter IC for 300MHz to 450MHz operation and is especially targeted for tire pressure sensor gauges, remote keyless entry, and passive entry and other automotive applications. It operates at data rates up to 40kbit/s Manchester for ASK and FSK with a typical 5.5dBm output power at 7.3mA. Transmitter parameters such as output power, output frequency, FSK deviation, and current consumption can be programmed using the SPI interface. This fully integrated PLL transmitter IC simplifies RF board design and results in very low material costs. Figure 1-1. Block Diagram Atmel ATA5749 1 10 CLK XTO RDY EN Power CLK DRV up/down 1 XTO Signal 4 or 8 Fractional-N-PLL CLK ON DIV CNTRL FSK mod 2 9 SDIN TXDIN GND FREQ 0:14 FSEP 0:7 Frac. Div. Digital Control and 433 N315 Registers 3 ASK mod 8 SCK PFD VS PWR 0:3 CP 4 7 ANT2 XTO1 LP XTO (FOX) 5 PA 6 ANT1 XTO2 VCO 2 ATA5749/ATA5749C DATASHEET 9128JRKE07/15