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UnipolarVoltageOutputDAC-to-BipolarVoltage.php    7773 Bytes    18-02-2024 16:00:17


Unipolar voltage output DAC to bipolar voltage


Online components calculator







Reference [V]

 

Output Range [±V]

 

DAC : 0 V ... Ref. Volt.

   

R1 [kΩ]

 

R2 [kΩ]

 

R3 [kΩ]

 





✈ Some Design Notes




• Choose a DAC with low gain error, low offset error, low drift, and low INL.
• Choose an OPAMP with low offset voltage and low offset voltage drift.
• Use precision 0.1% or better tolerance resistors with low temperature drift.
• RTFM (in this case RTFAN) from Texas Instruments. SLAA869.




✈ Practical Example




Reference Voltage = 3.3 V, Output Voltage = approx. ± 6 V
With some twiggling, we figured out the following Resistor combination :
Output Voltage = ± 6.6 V, R1 = 18 kΩ, R2 = 36 kΩ, R3 = 36 kΩ.


The PCB used here ...
... works like a charm :-)


The Gain calculated is 13.2 Vpp / 3.3 Vpp = 4. We measured 4.011. All resistors 1%. Used Operational Amplifier was an OPA141. Supply was ±15 V.




✈ Downloads








✈ Share your thoughts



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t1 = 6585 d

t2 = 191 ms

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