Evaluation Board For COMM Link Direct Digital Synthesizer

The 14-bit ISL5314 provides a complete Direct Digital Synthesizer (DDS) system in a single 48 Ld LQFP package. A 48-bit Programmable Carrier NCO (numerically controlled oscillator) and a high speed 14-bit DAC (digital-to-analog converter) are integrated into a stand alone DDS. The DDS accepts 48-bit center and offset frequency control information via a parallel processor interface. A 40-bit frequency tuning word can also be loaded via an asynchronous serial interface. Modulation control is provided by 3 external pins. The PH0 and PH1 pins select phase offsets of 0°, 90°, 180° and 270°, while the ENOFR pin enables or zeros the offset frequency word to the phase accumulator. The parallel processor interface has an 8-bit write-only data input C(7:0), a 4-bit address A(3:0) bus, a Write Strobe (WR), and a Write Enable (WE). The processor can update all registers simultaneously by loading a set of master registers, then transfer all master registers to the slave registers by asserting the UPDATE pin.

• 125MSPS output sample rate with 5V digital supply
• 100MSPS output sample rate with 3.3V digital supply
• 14-bit digital-to-analog (DAC) with internal reference
• Parallel control interface for fast tuning (50MSPS control register write rate) and serial control interface
• 48-bit programmable frequency control
• Offset frequency register and enable pin for fast FSK
• Small 48 Ld LQFP packaging
• Pb-Free (RoHS compliant)