Technical Information

Cost-effective. High-performance.
And under your control.

The TDA5051A transmits and receives digital signals on standard power lines or any two-wire AC or DC network. It’s a high-performance, intelligently automated solution that:

  • Transmits at a rate of 600 to 1200 baud
  • Operates from a +5V DC supply
  • Enables easy connections to standard microcontrollers, including NXP's LPC11xx series of low-power ARM-based microcontrollers

With the TDA5051A, you can help ensure the accuracy of the transmission carrier and the exact trimming of the digital filter, thus making performance independent of application disturbances such as component spread, temperature, and supply drift. Setup is simple:

  • Set the carrier frequency by an input reference clock, the on-chip oscillator, or the microcontroller.
  • Control the transmission and reception stages either by an external reference clock or by the on-chip reference oscillator connected to a crystal.

The TDA5051A includes a power output stage that provides a 120 dBuV (RMS) signal on a typical 30 ohm load. To reduce power consumption, the IC is disabled by a power-down (PD) input pin. In this mode, the on-chip oscillator remains active and the clock continues to be supplied at the CLK_OUT pin. For low-power operation in reception mode, this pin can be dynamically controlled by the microcontroller.

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Product Facts

  • The IC is designed for worldwide use and complies with industry-standard regulations. It is compliant with US Federal Communication Commission (FCC), Industry Canada, Japan MPT, and European CENELEC EN500065-1 regulations for signaling in the 125 to 140 kHz and 95 to 125 kHz frequency bands.
  • The DAC and the power stage are set in order to provide a maximum of 122 dBuV (RMS) at the output.
  • In reception mode, the input signal received by the modem is applied to a wide-range input amplifier with AGC (-6 to +30 dB).
  • NXP has developed a special ASK protocol to use directly with the Cortex-M0 microcontroller LPC1114 or similar processor. The modem can also be ported to a different processor.
  • The TDA5051A modem and the LPC1114 microcontroller are configured for a lighting-control application. NXP makes this configuration available in an evaluation/demonstration kit.