ATA5749_10 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 +12.5dBm from 300MHz to 450MHz
• Current Consumption is Scaled by Output Power Programming
• Fast Crystal Oscillator Start-up Time of Typically 200µs
• 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 –40°C to +125°C
• Supply Voltage Range of 1.9V to 3.6V
• TSSOP10 Package
Fractional-N
PLL Transmitter
IC
Atmel ATA5749
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 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.
9128E–RKE–09/10