| Electronics > Projects, Designs, and Technical Stuff |
| Using TL084 or TL074? |
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| gbowne1:
Hi all! What would help me figure out which TL074 or TL084 to use? Looking at the data there is a lot to choose from to narrow it down. But I got a little lost in the datasheets. I've used other TL0** type IC's but this pair is a little confusing. They are opamp IC's of course.. so they have a +4v/-4v input rail and seem to be a 70 to 80db Common Mode Rejection Ration (CMRR). Voltage and Bias current @ 15v w/ different values. The application needs a 14pin package. They both come from STMicro or TI. Greg |
| allanw:
Dunno if you saw this, but TI's site says "TL081 - Similar parts, where TL08x is a general purpose family and TL07x is a low noise family" |
| gbowne1:
No. I didn't see that. Low noise would be nice. It's an RF Application. |
| tecman:
--- Quote from: gbowne1 on May 17, 2010, 03:21:06 am ---No. I didn't see that. Low noise would be nice. It's an RF Application. --- End quote --- RF should mostly not be related to the op-amp. The low noise refers to internally generated noise in the op-amp. The op-amp noise will be much lower in spectrum than RF. If you are working in mV signals, lo noise can be a benefit. Paul |
| Zad:
The gain-bandwidth product on the TL08x is only 4MHz anyway. That is to say at 4MHz, max gain is 1, 2MHz it is 2, 1MHz it is 4 etc. There are RF op-amps, but that isn't one. |
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