DAC7811EVM: IAM NOT ABLE GET accurete voltage corresponding to mosi VOLTAGE AT TP2

Naresh naresh

Part Number: DAC7811EVM

Hiiii...

this is my clk and cs and mosi that iam getting from fpga board i conected this three with DAC7811 WITH J2_B ASS MOSI WITH J2_B11 AND CLK WITH J2B_3 AND CS WITH J2B_7 AND J3 BLOCK as +5v for j3_10 and DGNS AS J3_5 . and vcc and vss with j3_1 andj3_2

if i pass any value as mosi to the DAC7811EVM iam getting the VOUT as 1.60v for -Vref and 1.77v for +Vref the VOut values is never changed accordingly with SPI input data what could i make change to get VOut as accurate voltage

over 4 years ago

0 Uttam Sahu over 4 years ago

TI__Genius 14220 points

Hi Naresh,

Thank you for your query. I see that you have sent a reserved command and later a NOP command. Please check the correct command from Table 2 of the datasheet. Figure 27 provides the packet format.

Hope that answers your question.

Regards,

Uttam Sahu

Applications Engineer, Precision DACs

0 Naresh naresh over 4 years ago in reply to Uttam Sahu

Intellectual 535 points

hello..

i can't understand reserve command and NOP command .what i make actually in my design VHDL code i make 16-bit data i sent 1 and i am getting 1 in MOSI that MOSI i connected to spi pin in DAC7811EVM if i send any 16-bit data the output VOUT is not changing constantly i am getting 1.6v for solve this what should i do

0 Uttam Sahu over 4 years ago in reply to Naresh naresh

TI__Genius 14220 points

Closing this thread. It's a duplicate one.

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DAC7811EVM: IAM NOT ABLE GET accurete voltage corresponding to mosi VOLTAGE AT TP2