AD5758 is an new released chip, and now, I use this chip on my board to generate +/-10V voltage.
The circuit as follow:
I got some issue with this chip, could you helps to take a look this.
for the Vsense+ pin,
in page 16 of datasheet, "if remove sensing is not being used, short this pin to VIout via a series 1K RES",
in page 16 of datasheet, "if remove sensing of load is not required, connect +Vsense directly to VIout and connect -Vsense directly to AGND".
So, I am confuse whether I should add 1K resistor between VIout and +Vsense pin, please helps to take a look.
My board now can generate 0-10V voltage successfully, but, it can't generate negative voltage.
the VSS is -15V, I have measured it, looks my register configration for ADC is correct also, I have checked it several time.
But, I wonder why I can't get negative voltage. whether I should connect -Vsense to VIout also rather than AGND.
Or, could you helps to analysis the other reason.
1. For +VSENSE, it can be directly connected to VIOUT. However, if the application is prone to EMC events we recommend the 1K resistor.
2. -VSENSE and +VSENSE are used to sense the voltage at the…
Hi, I made a mistake, the follow word is the correct description.
in page 36 of datasheet, "if remove sensing of load is not required, connect +Vsense directly to VIout and connect -Vsense directly to AGND".
2. -VSENSE and +VSENSE are used to sense the voltage at the laod and maintain the output voltage on top of the common mode voltage at the load. -VSENSE should be connected to ground if remote sensing is not required as to keep the common mode voltage at 0V. Likewise +VSENSE should be connected to VIOUT if remote sensing is not used.
Have you written the DAC range correctly? Bits 3:0 in register 0x06 should be 0011 for +/- 10V range??
Very sorry, I have got the reason for this.
you can see the CR49 and U50, 2 DIODES will clamp the negative voltage, it is the reason.
5758 is an good chip.
Very thanks for your help.