Max,
What do you use to measure OPA376/OPA377 output voltage? Have you placed a scope at the output to see whether it is stable. With a capacitive load greater than 1uF, OPA376/OPA377 like most op amps is likely oscillating; very few op amps can drive…
Thank you.
Yes, I am using the OPA735. I think the period should be more like 0.62us? However, the auto-zero seems to be a likely source. It would also explain why the spikes don't appear when the buffer output is 0V, since discharging from 0V to 0V…
Sasa,
REF5020 has the lowest noise and lowest drift but nevertheless requires op amp driver for filtering and speed in order to obtain ADS8320's optimal performance. The best op amp for the driver in such application is OPA350 or OPA353 capable of direct…
Pablo,
Since all the input and output range specifications are referenced with respect to supply voltage, your conclusions about the input common-mode voltage range of OPA1642 and OPA227 are correct. However, when it comes to OPA227, you overlooked…
Other Parts Discussed in Thread: DAC7311 , OPA353 Using the DAC7311 EVM and an external reference on J2 pin 20 I noticed that the voltage going to the DAC7311 was much lower than the input reference voltage.
The cause of the discrepancy was the R2 which…
Other Parts Discussed in Thread: INA125 , TL082 , TLC251 , OPA353 , LM335 , LMC660
Hi,
I need an opamp to amplify the signal from a piezoelectric transducer (piezoelectric disc - 35mm), and I noticed in your document “AN-31 Op Amp Circuit Collection…
Other Parts Discussed in Thread: OPA353 , OPA350 Op amps like the OPA350 and OPA353 series are single-supply op amps (description says they are optimized for single-supply operation). Does this mean that they can be operated using +V and ground as the…
MSP430-Beginner,
OPA350 or OPA353 are capable of driving directly capacitive loads in 10uF range. Other than that, placing a 10-100ohm resistor in series with the output improves the capacitive load drive of most op amps but may cause DC error when…
MSP430 Beginner,
You came across the right op amp. OPA350/OPA353 are a unity-gain stable and the only ones I know that can drive directly 10uF loads. As far as the maximum output current goes, even though they are specified as +/-40mA, they can typically…
The attached presentation is where much of the methods for choosing the right R-C and Op Amp to drive a CDAC SAR converter were derived from. Look it over to help understand where the rules of thumb for op amp BW came from.
Let us know after studying…
