Analog Devices AD9125 Evaluation Board AD9125-M5375-EBZ AD9125-M5375-EBZ 数据表

 

Rev. A | Page 2 of 5 

 

Solder jumpers JP4, 5, 6, and 17 determine whether the DAC outputs go to the SMA connectors or to the modulator inputs. When direct 
DAC outputs are to be monitored, JP4, 5, 6, and 17 should be configured as what Figure 1 shows.  When the modulator output is to be 
measured, they should be configured as what Figure 2 shows. 

 

Figure 1 - DAC Output Configuration

 

Figure 2 - Modulator Output Configuration

 

The solder jumper on the left side of C139 determines whether the ref/sync clock of the AD9125 is from the AD9516 or an external 
source through the SMA jack J14 (AD9125_REF_CLKIN). When the AD9516 is used for the clock source, the jumper should be 
configured so that the center pad is connected to the top pad. When an external source is used, the center pad should be connected to the 
bottom pad.  

 

Other solder jumpers should be left in the default configuration. 

 

GETTING STARTED  

 

 

This setup configures the AD9125 to generate a sine wave by using the DPG2 as a data source. This allows the user to measure the single-
tone AC performance at the DAC output. Install the software as described in the Software section, and connect all the required cables as 
described in the Hardware Setup section. Turn on the power supply. 

For this setup, the clock source is set to generate a 500MHz tone at 3dBm. Using 2x interpolation and word mode, the data clock should 
be 250MHz. Jumpers JP4, 5, 6, and 17 should be set to their DAC output position. Open the AD9125 customer SPI software and go to the 
2

nd

 tab (data clock). Set the interpolation rate to 2X. Hit ‘run’ button. This will set the part to 2x interpolation mode and configure the 

clock going into the DPG2 to half of the DAC rate. 

In DPG2 Downloader software, the ‘DCO frequency’ shown should be 250MHz. (Due to the resolution of the DPG frequency counter, 
the measured frequency could be a little off). In the ‘evaluation board’ drop down menu, the selection should be shown as ‘AD9125’. This 
selection is automatically done when you plug the USB cable into the evaluation board.  

Select ‘Single Tone’ in the ‘Add Generated Waveform’ drop down menu in the DPG2 Downloader. Set the sample rate to 250MHz and the 
desired frequency to 31MHz. Check the box of ‘Generate Complex Data (I&Q)’. Pick the generated waveforms in the ‘I Data Vector’ and 

‘Q Data Vector’. Click Download (

) and Play (

). This results in a single-tone at the DAC output centered at 31MHz. The current on 

the 5V supply should be approximately 700mA with JP11 open (modulator supply off).