compensated versions of the popular CA series. Gate protected P-Channel MOSFET (PMOS) transistors are used in the input circuit to. CA Printer Friendly Version. 15MHz, BiMOS Operational Amplifier with MOSFET Input/CMOS Output. Datasheet &. Related Docs. Description. Key. CA 15MHz, Bimos Operational Amplifier With MOSFET Input/cmos Output. 15MHz, BiMOS Details, datasheet, quote on part number: CA

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Discussion in ‘ General Electronics Chat ‘ started by cravenhavenJan 9, CA opamp problems Reply to Thread.

CA3130 opamp problems

Jan 9, 1. Nov 17, datasheey 2. As such I am powering it with a single sided 5V supply and want the input and output to swing from 0 to 5V at least close to this. The problem I am observing is that when the input signal gets up to approx 3.

From 0 to 3. I tried a 47pf capacitor between pins 8 and 1 as suggested in the datasheet but it made no difference. I datashedt noticed that noise on pin8 begins at the same time as the output goes adtasheet. The oscillation has an approx 1V swing and is centered at about the expected output voltage, ie the output still appears to follow the input to some degree. Jan datawheet, 2. Jul 9, 2, Do you have decoupling capacitors at the power supply pins?

Does it also happen when you put datasheft load at the output? Jan 9, 3. I tried a cap across the input power pins just in case, but it made no difference. The power supply already has decoupling caps on its output and I cant see any noise at all on the power rails. The output is connected directly to the ADC input pin on the microcontroller a picaxe 28x2should I have a resistive load as well?.


Jan 9, 4. Jan 9, 5. I tried a 10k resistor between output and ground and it seems to have eliminated the noise but I still cant get above 3.

I then tried a 5M resistor but the noise came back. Jan 9, 6. Dec 26, 2, The CAA requires external frequency compensation.

See Pages 8and 9 of this data sheet, including Figure 8. Jan 9, 7. Jan 9, 8.

CA Datasheet(PDF) – Intersil Corporation

I tried a k and a 5M and both still had noise. I then tried a 1nf I think its 1nf, its a disc style cap with on it and no output load resistor. There is no noise but still no higher output. I had already looked at the datasheet but having dztasheet bit of trouble fully understanding it, particularly the offset and frequency compensation. My signal requirements are very slow moving DC so all I need is to cut off any high freq response. As I understand the datasheet, the chip datashert provide rail output into a high resistance load.

I figured that the microcomputer input should qualify as high resistance. Jan 9, 9.


Jun 6, 3, 5, Isn’t that like the first ever CMOS op amp ever made? Or am I thinking of something else??? Jan 9, Dec 23, Dec 20, 10, 1, I tried the ohm resistor and. Neither made any difference. Is there a better opamp to use instead of the ?. I’ve looked on all sorts of forums and most of the suggestions dont seem to be readily available.

Jan 10, Oct 26, Feb 12, In the end I tried the circuit shown in the datasheet for non-inverting amp with offset adjustment and frequency compensation and still didnt end up with a stable configuration, or rail output.

Thanks everyone for the help, I learnt a few things about opamps along the way though. Apr 14, 7, Note the input common mode range. The part is not guaranteed to work if the inputs are above 2. It is important to read and understand the specs of any part before you try to use it. Feb 13, If I have it configured as a voltage follower, does that mean that the common mode voltage exceeds 2. The zero output side was not a problem, its the high side and the output noise that was the biggest problem.


As I said in the first post, I got sold a pup when I had intended to purchase the CA but the shop had none, only CA’s were available. I quickly looked at the specs in the shop and they seemed to be similar which is why I ended up with them.

When an op amp is dataheet with negative feedback voltage follower is one exampledataheet two inputs will be at the same voltage. This voltage is called the common mode voltage, because it is common to both inputs. Opamp Posted by tommydyhr in forum: Vatasheet Posted by MDK in forum: You May Also Like: Bluetooth Headphones Let’s crack open some Bluetooth headphones and see the direction the mobile industry is going. How Does a Fuse Work? Understanding the Details of Fuse Operation and Implementation This article provides an overview of some subtle yet important aspects of fuse functionality and design.

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