COMMUNICATION SOLUTIONS

High-Power 315/434/868 MHz ASK/FSK Transmitters

The TDK511xF series from Infineon is a family of high-power ASK/FSK transmitters which require very few external components. The devices are ideally suited to M2M communications applications such as remote control systems, alarm systems, Remote Keyless Entry (RKE), Tyre Pressure Monitoring (TPM) systems and general-purpose communications.



Available in three frequency-range versions – 311MHz to 317MHz, 433MHz to 435MHz and 868MHz to 870MHz – the devices contain a fully-integrated PLL synthesiser and a high-efficiency power amplifier to drive a loop antenna.

A special circuit design and a unique power amplifier design are used to save current consumption and therefore to increase battery life. Additional features such as power-down mode and divided clock output are implemented to further reduce power consumption.

The on-chip PLL synthesiser consists of a Voltage Controlled Oscillator (VCO), an asynchronous divider chain, a phase detector, a charge pump and a loop filter. The tuning circuit of the VCO, consisting of spiral inductors and varactor diodes, is also integrated on-chip.

The ICs can be used for both ASK and FSK modulation. They are characterised for use across the extended -40°C to +125°C temperature range, and supplied in a space-saving 10-pin TSSOP.

Product Specification Table

Type	TDK5110F	TDK5111F	TDK5116F
Frequency Range	433MHz – 435MHz	311MHz – 317MHz	868MHz – 870MHz
Data Rate	20kHz (ASK/FSK)	20kHz (ASK/FSK)	20kHz (ASK/FSK)
Supply Voltage	2.1V – 4V	2.1V – 4V	2.1V – 4V
Typical Supply Current, (PLL Enable mode/ Transit Mode Vs = 3V)	4/14.2mA	4/14mA	4/14.2mA
Power Down Current	4µA	4µA	4µA
Typical RF Transmit Power,	10.0dBm	10.0dBm	10.0dBm
Package	PG-TSSOP-10	PG-TSSOP-10	PG-TSSOP-10
Temperature Range	-40°C to +125°C	-40°C to +125°C	-40°C to +125°C

Features

• Highly integrated ASK/FSK transmitters
• Choice of frequencies
  • 311MHz to 317MHz
  • 433MHz to 435MHz
  • 868MHz to 870MHz
• High-efficiency power amplifier: typically 10dBm at 3V
• Fully integrated frequency synthesiser
• VCO without external components
• Power-down mode 4µA
• Divided clock output for microcontroller
• Integrated FSK switch
• Low supply current: typically 14mA at 3V
• Voltage supply range 2.1V to 4V
• Temperature range -40°C to +125°C
• 10-pin TSSOP

Applications

• Remote Keyless Entry (RKE) systems
• Tyre Pressure Monitoring (TPM) systems
• Remote control systems
• Alarm systems
• Communication systems

For further information, including the Infineon TDK511xF Product Brief, please click here