Hi,

I'm getting a bit confused trying to figure out what components I need to connect the DAC714P in Bipolar mode ±10V This is the datasheet: http://www.ti.com/lit/ds/symlink/dac714.pdf On page 11 the wiring diagram is given for ±10V bipolar mode. On the right hand side are the following components given:

Could someone tell me if these should be the suggested D/As CMOS specified on the same page (11). And if this is true, these have 12-bit resolution wouldn't this be a problem while i'm using 16-bit. The DAC714P is 16-bit!

What I think is that these two components are one of the D/As CMOS, for example the DAC7800 : http://www.ti.com/lit/ds/symlink/dac7802.pdf and page 10 shows where to connect Vref A and Vref B and that a lot of other components are to be connected. There should also be a feedback loop towards Rfb A/B should that connection be in front of the C1 on the figure below?


Hope someone can help me with this, I'm making a prototype.

Best regards,

Dukel

 

Ok, I'm making it to hard for myself. I don't need a Gain and Offset Adjustment.
The datasheet has a Manual Offset and Gain Adjust circuit but this is for ±5V output range. I do need the ±10V.
Can anyone help me with changing the circuit to ±10V


Thank you

 

hi 192,
Welcome to AAC.
Have been looking thru the datasheets you have posted, I would say for +/-10V 16Bit Bi-polar operation you will need Gain and Offset adjustment.
I must say the d/s is not all that clear.

E

 

Hi Ericgibbs,

Is there no way to adjust the ±5V circuit to get ±10V, maybe by changing the +10V referece to +20V

Dukel

 

hi.
Looking at Fig#1 , block diagram, shows the internal Vref at +10V is internally connected to the DA switches.
I would say that trying to force the Vref to +20v will cause problems.

To build the required circuit as shown in image A002 would be my option, use the OPA types specified.
E
EDIT:
The clip you posted are trim pots to set the 0 thru 10V Vref's

 

hi.
Looking at Fig#1 , block diagram, shows the internal Vref at +10V is internally connected to the DA switches.
I would say that trying to force the Vref to +20v will cause problems.

To build the required circuit as shown in image A002 would be my option, use the OPA types specified.
E
EDIT:
The clip you posted are trim pots to set the 0 thru 10V Vref's

Thank you for your response I will indeed take te Op amps specified if I make this circuit, About the trim pots

those are the suggested D/As CMOS right? If I for example take the DAC7800, do I just wire a feedback from VoutA to Rfb A. In front of the capacitor?
could you also take a quick look at this datasheet http://www.ti.com/lit/ds/symlink/dac7731.pdf wouldn't this be a lot easier, there is almost no need for extra electronics, only thing is that it is not a DIP package so harder to solder on my own for a prototype.

Dukel

 

hi,
DAC7731 looks much easier to configure, its also SPI.
You can get adaptor PCB's for SMD.
E

EDIT:
https://www.google.com/search?q=24+pin+ssop+adapter&ie=utf-8&oe=utf-8&client=firefox-b

 

hi,
DAC7731 looks much easier to configure, its also SPI.
You can get adaptor PCB's for SMD.
E

EDIT:
https://www.google.com/search?q=24+pin+ssop+adapter&ie=utf-8&oe=utf-8&client=firefox-b

I think this would be the better solution as well, thank you Eric for your support!