ATA5749_09 Datasheet, PDF (1/26 Pages) ATMEL Corporation – Fractional-N PLL Transmitter IC

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 µs
• 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
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
Fractional-N
PLL Transmitter
IC
ATA5749
Preliminary
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,
and 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.
9128D–RKE–01/09