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AD5760 Setup Issue

Question asked by nirmpol on Jul 6, 2018
Latest reply on Jul 8, 2018 by nirmpol

Hello!

 

We are trying to get an output from the AD5760 Evaluation board which is connected to a Raspberry Pi 3 through SPI communication. I have connected the SYNC, SDIN, SDO, and SCLK pins on the board to the Pi. The Vcc is connected to 5 V on the Pi and the DGND is connected to the Pi's ground. There is 10 V between the Vdd and AGND and -7.5 V between Vss and AGND which is connected to a Tektronics power supply.

 

I have also configured the Link options as follows to get 0-10V output range from the Vout_buff

LK1 = Position B (source from Connector J1)

LK2 = positive reference voltage source is +10V

LK3 = Position A (unity gain)

LK4 = removed

LK5 = Reset is logic high

LK6 = CLR is logic high

LK7 = LDAC is logic high

LK8 = negative reference voltage is AGND

LK11 = removed

 

So far, the Vout_buff only generates 0 V or fluctuates between 0.3-0.5 V. We are not sure if there is a hardware setup issue or a software issue. The code is attached below.

 

Thanks!

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