Use USBDAQ to Complete the Calibration of PGA
Use USB_DAQ to Complete the Calibration of PGA 309 EVM Iven Xu Feb. 6 th, 2013 iven-xu@ti. com 1
Agenda • USB_DAQ and PGA 309 EVM overview • Calibration principle of PGA 309 EVM – Sub-bullet here • Three output mode of PGA 309 EVM – 4 -wire voltage output mode – 3 -wire voltage output mode – Current output mode • Multi-Calibration principle of PGA 309 2
a) 4 -wire voltage output mode 3
a) 4 -wire voltage output mode: • PGA 309 EVM Default Configuration 4
a) 4 -wire voltage output mode: • USB_DAQ Board Default Configuration 5
a) 4 -wire voltage output mode: Windows 7 Attention Default GUI Interface 6
a) 4 -wire voltage output mode: 7
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b) Current output mode: • USB DAQ Configuration 23
b) Current output mode: • PGA 309 EVM Configuration * When we want to use current output mode of XTR 117: * we should make sure the configuration of PGA 309 is in 4 -wire voltage output mode; * Because in 3 -wire voltage output mode of PGA 309, we should turn on/off the Vs of PGA 309. But in 3 -wire mode, the one-wire and Vout is connect in one junction, so we cannot use one-wire to control the Vs (turn on/off). * conclusion: is we should use 4 -wire voltage output for current output. 24
b) Current output mode: 25
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Thanks! 31
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