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Maxim Integrated MAXREFDES Series, Manual, Page: 12 / 13

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Maxim Integrated MAXREFDES Series Manual Download Page 12

16. Place a J26 shunt and repeat the performance of the V

REF

/2 reading. 

17. Apply a 10kHz sine wave from an external source, e.g. Audio Precision 2700, to CON3 

(AIN0+). Synchronize the external source with the MAXREFDES74# ADC by connecting 
CON9 (SYNC_CLK_OUT) to the REF IN input for coherent sampling. In the ADC 
Configuration tab, check the Sync-Out CLK (10MHz) selection box to enable the 10MHz 
clock output from the ZedBoard and click the Set button. Then go to the FFT tab, select 
Sampling Rate, Number of Samples, put desired signal frequency in the Input Signal 
(Hz) pulldown menu and then click the Calculate button. The GUI will calculate the 
coherent input signal frequency based on the coherent sampling equation. The user will 
then enter the adjusted signal frequency, shown in the Adjusted (Hz) box, into the 
external function generator. Then click the Capture button in the FFT tab. 

 

Figure 8. Coherent sampling of a 10kHz sine wave.

 

 

Figure 9. Coherent sampling of a 1kHz sine wave.

 

 

Summary of Contents for MAXREFDES Series

Page 1: ...h accuracy low power data converters The MAXREFDES74 design works as a building block for a high speed low power high accuracy data acquisition and control system for industrial process control and automation and high speed protection systems for power distribution and automation By changing the ADC and DAC to pin compatible 16 bit devices such as the MAX11166 and the MAX5316 a 16 bit data acquisi...

Page 2: ...S74 reference design performs high speed 18 bit precision data acquisition based on Maxim s leading edge high accuracy low power data converters The MAXREFDES74 design works as a building block for a high speed low power high accuracy data acquisition and control system for industrial process control and automation and high speed protection systems for power distribution and automation By changing...

Page 3: ...own in Figure 1 Figure 1 MAXREFDES74 block diagram The analog front end consists of two user selectable MAX9632 op amps followed by the MAX11156 The op amps can be configured as inverting or noninverting amplifiers by jumper selectors Both op amps work as anti aliasing lowpass filters LPF and can be daisy chained to create a second order LPF The output of the MAX5318 DAC can also be configured as ...

Page 4: ...C output in Table 2 and a VREF connection in Table 3 Table 1 ADC Input Configuration CONFIG ADC INPUT CONFIGURATION INPUT CONNECTORS SHUNT POSITIONS 1 Noninverting single ended second order LPF default CON3 AIN0 or TP2 and TP8 AIN0 and AGND J28 1 2 J29 1 2 and 3 4 J32 5 6 and 3 4 J10 1 2 and 9 10 2 Noninverting differential second order LPF CON3 TP2 AIN0 CON2 TP1 AIN0 J28 Open J29 1 2 J32 5 6 and ...

Page 5: ...first order LPF CON4 AIN1 or TP10 and TP15 AIN1 and AGND J29 3 4 J32 1 2 and 7 8 J10 1 2 and 9 10 8 DAC noninverting single ended Use the on board MAX5318 as input source J10 3 4 and 9 10 J9 1 2 J5 1 2 J18 1 2 9 DAC inverting single ended Use the on board MAX5318 as input source J10 5 6 and 9 10 J9 1 2 J5 1 2 J18 1 2 DAC differential Use the on board MAX5318 as input source J10 3 4 Jump wire J10 5...

Page 6: ... and AGND 12 Differential 3 x VREF to 3 x VREF J9 1 2 J5 1 2 J18 1 2 CON11 TP46 DAC_OUT CON10 TP18 DAC_OUT 13 Single ended 1 5 x VREF to 1 5 x VREF default J9 3 4 J5 1 2 J18 1 2 CON11 DAC_OUT or TP46 and TP41 DAC_OUT and AGND Note Alternate connections are shown in parentheses Table 3 VREF Connection CONFIG VREF SHUNT POSITIONS FOR ADC SHUNT POSITIONS FOR DAC 14 Internal J13 open default 15 Extern...

Page 7: ...e driver and transformer create an additional negative rail for 20V and 20V The power is then rectified and regulated down to a 15V and 15V supplies for the op amps as well as into 5V VDDand 3 3V VDDIO for VREF ADC and DAC See the MAXREFDES74 schematic for details Specific voltages may be connected to the board for each rail see Table 4 for corresponding shunt positions ...

Page 8: ...Board The MAXREFDES74 board is connected to the ZedBoard through a low pin count FMC CON1 connector The ZedBoard should be connected to a PC through an Ethernet port which allows the GUI to perform different operations with full control over mezzanine card functions Quick Start Guide Required Equipment MAXREFDES74 18 bit precision data acquisition board with 15V 1A AC DC wall adapter or 15V DC pow...

Page 9: ...the card slot J12 of ZedBoard located underneath the PCB 5 Verify the ZedBoard boot mode MIO2 6 jumpers are set to SD card mode as described in the Hardware User Guide for ZedBoard MIO6 GND MIO5 3V3 MIO4 3V3 MIO3 GND MIO2 GND 6 Turn on the power switch SW8 of the ZedBoard to the ON position The green power good LED LD13 should light and the current revision of the MAXREFDES74 firmware is displayed...

Page 10: ...0V AGND input Make sure that all inputs are grounded by shunts on J28 and J29 see the ADC Input Configuration table Table 1 and the MAXREFDES74 schematic 15 Go to the Scope Histogram and FFT tabs to verify functionality and performance of the 0V reading Set the Sampling rate and select the Number of Samples the Display Units and the Average from the corresponding pulldown menu and perform a read o...

Page 11: ...Figure 5 Scope tab Figure 6 Histogram tab Figure 7 FFT tab ...

Page 12: ...z clock output from the ZedBoard and click the Set button Then go to the FFT tab select Sampling Rate Number of Samples put desired signal frequency in the Input Signal Hz pulldown menu and then click the Calculate button The GUI will calculate the coherent input signal frequency based on the coherent sampling equation The user will then enter the adjusted signal frequency shown in the Adjusted Hz...

Page 13: ...es Hardware Files Schematic Bill of Materials BOM PCB Layout PCB Gerber Software Files Software GUI Firmware Files ZedBoard Firmware Part Number MAXREFDES74 Status Active Carrier Type Box https www maximintegrated com en design reference design center system board 5944 html tb_tab0 6 20 19 ...

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