Input | Output | Supply | Load Resistance (RL) | ||||
---|---|---|---|---|---|---|---|
ViMin | ViMax | ILMin | ILMax | Vcc | Vee | RLMin | RLMax |
0.49V | 4.9V | 1µA | 10µA | 5V | 0V | 0Ω | 390kΩ |
This circuit delivers a precise low-level current, IL, to a load, RL. The design operates on a single 5V supply and uses one precision low-drift op amp and one instrumentation amplifier. Simple modifications can change the range and accuracy of the voltage-to-current (V-I) converter.
DC Simulation Results
Vi | RL | IL | VoOPA | VoOPA Compliance | VoINA | VoINA Compliance |
---|---|---|---|---|---|---|
0.49V | 0Ω | 0.999627µA | 99.982723mV | 100mV to 4.9V | 490.013346mV | 75mV to 4.925V |
0.49V | 390kΩ | 0.999627µA | 489.837228mV | 100mV to 4.9V | 490.013233mV | 75mV to 4.925V |
4.9V | 0Ω | 9.996034µA | 999.623352mV | 100mV to 4.9V | 4.900016V | 75mV to 4.925V |
4.9V | 390kΩ | 9.996031µA | 4.898075V | 100mV to 4.9V | 4.900015V | 75mV to 4.925V |
Texas Instruments, SBOMAT8 TINA-TI™ circuit simulation, file download
Texas Instruments, Low-Level V-to-I Converter Reference Design, 0V to 5V Input and 0µA to 5µA Output, product page
Texas Instruments, Solving Op Amp Stability Issues, E2ETM amplifiers forum
OPA333 | |
---|---|
Vss | 1.8V to 5.5V |
VinCM | Rail-to-rail |
Vout | Rail-to-rail |
Vos | 2µV |
Iq | 17µA/Ch |
Ib | 70pA |
UGBW | 350kHz |
SR | 0.16V/µs |
#Channels | 1 and 2 |
OPA333 |
INA326 | |
---|---|
Vss | 2.7V to 5.5V |
VinCM | Rail-to-rail |
Vout | Rail-to-rail |
Vos | 20µV |
Iq | 2.4mA |
Ib | 0.2nA |
UGBW | 1kHz (set by 1kHz filter) |
SR | 0.012V/µs (set by 1kHz filter) |
#Channels | 1 |
INA326 |
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