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DAC Section
At the transmitting path, there are also 4 high-speed 14-bit DA converters. The DAC clock frequency is 128 MS/s, so Nyquist frequency is 64MHz. However, we will probably want to stay below it to make filtering easier. A useful output frequency range is from DC to about 44MHz. The DACs can supply 1V peak to a 50 ohm differential load, or 10mW (10dBm). There is also PGA used after the DAC, providing up to 20dB gain. This PGA is software programmable. The DAC signals (IOUTP_A/IOUTN_A and IOUTP_B/IOUTN_B) are current-output, each varying between 0 and 20 mA. They can be converted into differential voltages with a resistor.
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