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UnipolarVoltageOutputDAC-to-BipolarVoltage.php 7819 Bytes 06-03-2025 12:51:49
Unipolar voltage output DAC to bipolar voltage
Online components calculator
✈ 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.
• 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.
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 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
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t1 = 7319 d
t2 = 222 ms |
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