(DSM) Data Signal Modulator Module

The Data Signal Modulator (DSM) is a peripheral that allows the user to mix a data stream, also known as a modulator signal, with a carrier signal to produce a modulated output.

Both the carrier and the modulator signals are supplied to the DSM module either internally, from the output of a peripheral, or externally through an input pin.

The modulated output signal is generated by performing a logical “AND” operation of both the carrier and modulator signals and then provided to the MDOUT pin.

The carrier signal is comprised of two distinct and separate signals. A Carrier High (CARH) signal and a Carrier Low (CARL) signal. During the time in which the modulator (MOD) signal is in a logic high state, the DSM mixes the CARH signal with the modulator signal. When the modulator signal is in a logic low state, the DSM mixes the CARL signal with the modulator signal.

Using this method, the DSM can generate the following types of key modulation schemes:

Additionally, the following features are provided within the DSM module:

The figure below shows a simplified block diagram of the data signal modulator peripheral.

Figure 1. Simplified Block Diagram of the Data Signal Modulator