ATA5749_Preliminary| Datasheet

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Features

Fully Integrated Fractional-N PLL ASK and Closed Loop FSK Modulation Output Power Up to +12.5 dBm from 300 MHz to 450 MHz Current Consumption is Scaled by Output Power Programming Fast Crystal Oscillator Start-up Time of Typically 200 us Low Current Consumption of Typically 7.3 mA at 5.5 dBm Only One 13.0000 MHz Crystal for 314.1 MHz to 329.5 MHz and 424.5 MHz to 439.9 MHz Operation Single Ended RF Power Amplifier Output Many Software Programmable Options Using SPI: Output Power from 0.5 dBm to +12.5 dBm RF Frequency from 300 MHz to 450 MHz with Different Crystals FSK Deviation with 396 Hz Resolution CLK Output Frequency 3.25 MHz or 1.625 MHz Data Rate Up to 40 kbit/s (Manchester) 4 KV HBM ESD Protection Including XTO Operating Temperature Range of 40 C to +125 C Supply Voltage Range of 1.9V to 3.6V TSSOP10 Package

Fractional-N PLL Transmitter IC ATA5749 Preliminary

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

1. Description
The ATA5749 is a fractional-N-PLL transmitter IC for 300 MHz to 450 MHz operation and is especially targeted for Tire Pressure Sensor Gauges, Remote Keyless Entry, Passive Entry and other automotive applications. It operates at data rates up to 40 kbit/s Manchester for ASK and FSK with a typical 5.5 dBm output power at 7.3 mA. 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.

9128B RKE 08/08