User Manual

4
ATAR862-3
4556B–4BMCU–02/03
UHF ASK/FSK Transmitter Block
Features
• Integrated PLL Loop Filter
• ESD Protection (4 kV HBM/200 V MM, Except Pin 2: 4 kV HBM/100 V MM) also at ANT1/ANT2
• Maximum Output Power (10 dBm) with Low Supply Current (9.5 mA Typically)
• Modulation Scheme ASK/FSK
– FSK Modulation is Achieved by Connecting an Additional Capacitor between the XTAL Load Capacitor and the Open-
drain Output of the Modulating Microcontroller
• Easy to Design-in Due to Excellent Isolation of the PLL from the PA and Power Supply
• Supply Voltage 2.0 V to 4.0 V in the Temperature Range of -40°C to +125°C
• Single-ended Antenna Output with High Efficient Power Amplifier
• External CLK Output for Clocking the Microcontroller
• 125°C Operation for Tire Pressure Systems
Description
The PLL transmitter block has been developed for the demands of RF low-cost transmission systems, at data rates up to
32 kbaud. The transmitting frequency range is 310 MHz to 330 MHz. It can be used in both FSK and ASK systems.