Part Number: OPA137 The product description states that this is an FET technology, but there are 2 kinds of FETs possible, MOSFET and JFET.
Please kindly advise which one it is. I like the device, but I may have to apply special protections in my whacky…
Part Number: OPA137 Other Parts Discussed in Thread: OPA2137 , SN74LVC2T45 As a PCB designer, I was burned by TI's use of the WRONG name for the 0.65mm-pitch IC package. It cost me a Design Revision and some gratuitous adrenaline.
TI's own website…
Hi Lakshmanan,
I notice that you're providing power to the INA217 and OPA137 directly from the USB connector. While both the INA217 and OPA137 have good PSRR specifications, there will be some noise from the USB supply that bleeds through into the output…
I changed the OPA140 to OPA137. the circuit works and the output waveforms look good with the 50 Hz sine input. It looks like the op amps are stable.
But practically the OPA 4140 will be very hot due to the overcurrent. Once I removed the OPA4140 from…
Phillip,
I agree - that is why our latest OPA172 does include the diagram of the ESD/EOS input protection.
For the lower power, please see OPA137 with 1MHz bandwidth and typical IQ of 220uA. But remember that lower power means a higher input noise.
Hi,
I have built a circuit using INA217 with NR3158 knowles microphone without the XLR connector, but its not working with INA217, i couldn't understand why ?
I am not using any phantom power as per the circuit in fig. 4 of the data sheet and also…
Hi,
I selected INA217 for the microphone signal amplification as it offers low noise.
I need to know if there is any document explaining its operation when input pin 2 and 3 contains an audio signal from knowles NR 3158 microphone +ve and -ve terminals…
I built the circuit with the OPA2137, the dual version of the OPA137, and it worked. The accuracy of the secondary current was off a little. So I put a pot in place of the 50 ohm resister, and tuned it to 52.2 ohms. At 52.2 ohms, the current tracks the…
I've used the suggested OPA171 and the OPA137, which is functionally equivalent, according to the OPA171 page. I'm using a +/- 12V source. My Vin is between 0.5V and 2.8V. I get 1.11V to 8.95V out.
