Mixed assortment of different op-amps to do some practice - Page 1
Forum section: electronics / beginners

author: analogo
author_rank: Regular Contributor
timestamp: June 23, 2017, 08:29:04 pm
content: I am studying op-amps at the moment and I read everywhere that there are many different kinds of op-amps that one can buy. I would like to play with these different classes to understand how they work and their gotchas. I have only one op-amp at the moment (LM358) and I would like to order some other.What categories of op-amps should I care about? What are good (almost "jelly bean") representatives of each class and of the limitations of that class?The only particular categories that I know of (but I have no examples of) arerail-to-rail op-ampsbipolar op-ampsCMOS op-ampsWhat else is out there?

author: MosherIV
author_rank: Super Contributor
timestamp: June 23, 2017, 09:52:34 pm
content: Bi-polar - some op-amp are marketed as Single rail but in reality if you bias them mid way, any opamp can run from single rail.Get some JFET op-amps, they have very high input impedance but are more suseptable to static.

author: Neomys Sapiens
author_rank: Super Contributor
timestamp: June 23, 2017, 11:30:18 pm
content: Some recommendations:of course, one should have some of the 'classics', even if only as a bad example.And some of them are passable and quite forgiving.LM301, LM741, LM324, TL071/2/4 (or 08x)intermediary GenerationNS LPC660IN OPA, Low-Power quad CMOS, r2r-out, <1mW, 2fAb ~3mVos, 0.11V/µs 0.35MHz CMRR>63db >1TOhmLTC LT1013/1014 OPA, Dual/Quad precision low noise, os<300µV/1nA, Ib<30nA, Avol2.5V/µV typ, 500kHz 0.4V/µs, CMRR114db typ.LTC LT1077 Micropower/precision OPA, 250kHz 0.12V/µs, single supply; Ib<11nA, os<60µV/350pA, 60µA max.NE5532/5534, low noise OPAs. the audio people seem to love themAD822 Dual precision, r2r, Low-Power, FET-Input OP,AD845 Precision, 16MHz CBFET OPA,TLC2272/4 OPA, LinCMOS Dual/Quad r2r, low noise, typ Ib1pA os300µVAnd now some nice ones:LTC LT1468/1469 bipolar 90MHz, 22V/ms 16-Bit Accurate Operational Amplifierdespite its performance, it behaves rock-solid! Solved many problems for me.LT1800/1801 OPA, Low Power R2R In/Out Precision 80MHzAD8512 OPA, dual JFET Precision, Wideband, very low Noise, low Bias CurrentAD8522 Dual Zero-Drift, Single-Supply, r2r Input/Output OPAADA4077 OPA, High Precision, Low Offset and Drift, 4MHz 7nV/Sqrt(Hz) (NextGen OPxx77)LMP2021MA OPA, Zero-Drift, Low Noise EMI hardened, r2r outTLE2021 OPA, Excalibur Precision, High-Speed, Low-Power, ext. Adj. (and other TLE202x)TLE214x OPA, single/dual/quad Excalibur BiFET Low-Noise High-Speed Precision;ADA4857 OPA, ultra-low Distortion, low Noise, high Speed, power-down InputLMH6612 OPA, Dual, Single Supply 345 MHz Rail-to-Rail Output

author: schmitt trigger
author_rank: Super Contributor
timestamp: June 24, 2017, 12:13:19 am
content: Neomys Sapiens compiled a very comprehensive selection.I would only add the LM3900 and the LM13700 transconductance amps.Also, for comparator use, get yourself some real devices: The LM339 and the LM311.

author: Neomys Sapiens
author_rank: Super Contributor
timestamp: June 24, 2017, 12:32:29 am
content: Ok, I intentionally left those out, as well as CFAs, Power-OPAs, Combo-components like LM10, Differential OPAs, Hybrids akin to the LH0022 etc

author: schmitt trigger
author_rank: Super Contributor
timestamp: June 24, 2017, 12:37:44 am
content: you may be right...transconductance amps are a little advanced.But the comparator selection I would definitively consider.

author: Neomys Sapiens
author_rank: Super Contributor
timestamp: June 24, 2017, 01:06:54 am
content: Power-OPAs (affordable, of course, there's APEX)TI OPA552 High-Voltage, High-Current Operational Amplifier; OT/OC protectedTI OPA549S High-Voltage, High-Current Operational Amplifier; OT/OC protected,TI OPA569 Power Op Amp, Output Signal Swings Within 200mV of Rails at 2A Output Current; 1.2MHz 1.2V/µsLT LT1970 500mA Power Op Amp with Adjustable Precision Current LimitNS LM675T Power OPA, 3A max, 5.5MHzGBW, 8V/µs 1mVOS, Gain 90dB, OT/OC prot.Siemens TCA1365 Power-OPA, 4A 42V max, SC/Th-prot.,ok, I'll leave the other categories to someone else...

author: Audioguru
author_rank: Super Contributor
timestamp: June 24, 2017, 03:59:12 am
content: The LM358 dual and LM324 quad opamps use low power so some common things in normal opamps have been left out. The are noisy (hiss), have crossover distortion (look in Google) and cannot produce high level outputs above 2kHz. Audio opamps do not have these awful problems.

author: David Hess
author_rank: Super Contributor
timestamp: June 24, 2017, 07:56:30 pm
content: I am just going to list inexpensive parts suitable for learning.LM358 (dual) and LM324 (quad) - General purpose operational amplifiers, Single supply inputs and outputLM393 (dual) and LM339 (quad) - General purpose 1 microsecond comparators, Single supply inputs, Comparator version of the LM358 and LM324 aboveLM301A (single) - Input range includes positive supply (1), Supports clamping through compensation pin (2), Use instead of 741 typesOP07 (single) - General purpose bipolar precisionTL051 (single) and TL052 (dual) - JFET input, Low input bias current, High bandwidth, High slew rate, Input range includes positive supply (1), Faster higher precision replacement for TL071 and TL081 types, Use instead of TL071 and TL081 types(1) Operational amplifiers which support input voltages to the positive supply are useful for high side current sensing.(2) Support for clamping is very rare and useful for constant voltage constant current power supplies. The LM301A is also more suitable for use as a comparator than most other operational amplifiers when no compensation is used.

author: Neganur
author_rank: Unknown
timestamp: June 25, 2017, 11:32:07 am
content: Digilent has a nice assortment with Analog Devices opamps, in amps etc.:http://store.digilentinc.com/analog-parts-kit-by-analog-devices-companion-parts-kit-for-the-analog-discovery/It costs 75$ and I remember looking up prices at Digi-Key and found their offer to be reasonable (cheaper than buying individually). It contains many of the already mentioned :Part # Description Package Datasheet NotesAD8226 Instrumentation Amp Cmod IC1 LinkSSM2220 PNP Matched Transistors Cmod IC2 LinkSSM2212 NPN Matched Transistors Cmod IC3 LinkADTL082 JFET Op Amp Cmod IC4 LinkAD8541 General Purpose Op Amp Cmod IC5 LinkADP3300-5 Low Dropout Linear Regulator Cmod IC8 LinkAD592 Precision IC Temperature Transducer TO-92 LinkAD584 Programmable Precision Voltage Reference PDIP8 LinkAD654 Voltage to Frequency Converter (Timer) PDIP8 LinkAD8561 Comparator PDIP8 LinkOP27 Low Noise, Precision Op Amp PDIP8 LinkOP37 Low Noise, Precision, High Speed Op Amp PDIP8 LinkOP482 Low Noise, Precision, High Speed Op Amp PDIP14 LinkOP484 Precision Rail-to-Rail Input & Output Op Amp PDIP14 LinkAD8210 Current Shunt Monitor Cmod IC6 LinkAD22151 Magnetic Field Sensor Cmod IC7 LinkADXL327 Accelerometer Cmod IC9 Link 3.3V only!ADMP504 Ultralow Noise Microphone Cmod IC10 Link 3.3V only!AD2210 Temperature Sensor TO-226AA Link Marking: AD22100605-00004 Piezo Vibration Sensor LinkQSC114 Infrared Transistor T-1 LinkTMP01Another set is from Texas Instruments:https://www.digikey.com/product-detail/en/texas-instruments/AMPQUICKKIT-EVM/296-42199-ND/5332478(30$)OPA170, OPA171, OPA172, OPA313, OPA314, OPA316 1 - Single Channels per IC General Purpose Amplifier Evaluation BoardOr a bigger set wit PCB: (pricy at 200$)https://www.digikey.com/product-detail/en/texas-instruments/TI-PLABS-AMP-EVM/296-42225-ND/5332504TI-PLABS-AMP-EVM board (1x)OPA211 IC mounted on DIP adapter (2x)OPA188 IC mounted on DIP adapter (2x)OPA171 IC mounted on DIP adapter (1x)OPA277 IC mounted on DIP adapter (1x)OPA140 IC mounted on DIP adapter (1x)Edit: clarified that I meant cheaper than buying the parts individually.

author: Kleinstein
author_rank: Super Contributor
timestamp: June 25, 2017, 12:35:24 pm
content: Just for experiment on the breadboard, there is not much use for super fast OPs, like more than 20 MHz GBW. Usually one can do much with the more cheaper / jelly bean OPs. Learning electronics is also about learning the limits of the parts. Thus using no so good parts can help.The LM358 is still nice for the simple stuff and the breadboard and they are dirt cheap.Common Rail to Rail types are TS912 and MCP6002. They are CMOS and thus also good for high impedance things.Classic JFET Ops are TL07x (or more noisy TL08x) series and similar LF412 / LF351.The OP07 is a classic precision OP. The OP27 (similar to LT1007) is the faster, lower noise version.The NE5532/NE5534 are classics for audio.

author: mpaavola
author_rank: Newbie
timestamp: June 12, 2024, 08:44:32 pm
content: I can't believe you guys left out the LF347n, quad op amp!!!

author: David Hess
author_rank: Super Contributor
timestamp: June 12, 2024, 09:12:05 pm
content: Quote from: mpaavola on June 12, 2024, 08:44:32 pmThe TL071/TL072/TL074, or better the TL051/TL052/TL054, are just more familiar and common than the LF351/LF353/LF347.