Opa1642 vs opa1656. 2-nV/√ Hz noise density and distortion of –127 dB at 1 kHz. Every amp. OPA1622 SoundPlus High-Fidelity, Bipolar-Input, Audio Lead finish/ The OPA2156 is a new, high-performance op-amp from TI. It needs an adapter though. (or the 2156) The opamp has good phase margin and seems quite tolerant of sub-optimal layout. It has the most stable input capacitance vs. 9 mA of supply current to accommodate the power supply constraints of many types of audio products. Currently, I require opamps in the DIP package. I would tend to use the OPA1642 for buffering, filtering and EQ. Jul 4, 2009 · Marketing 101 by having one of the engineers on the diy threads because it creates interest (especially from spec crazy diy-ers who “need” the lastest and best specs and use “word of mouth” via the audiophile threads to push cost up by popular demand) They do outsource them to official distributors ie Mouser, Digi-Key but you have to buy them in bulk (we’re talking 100s to 1000s) and The OPA1652 (dual) and OPA1654 (quad) FET-input operational amplifiers achieve a low 4. Stage 2 remains as an OPA1611, so the FB factor just increases by 6dB. PRODUCTION DATA. JFET inputs let you work with a larger range of input resistors. in order to resurrect those signals the preamp applies a maximum gain of 1000 b/c the basic mid-band gain must be ~ x100. 8 mA per channel. With that being said, there will not be a huge noise performance difference between OPA1656 (~4nV/rthz) vs OPA1678 (~5nV/rthz) when the thermal noise is already 11. ah so much other untested opa's 1678 still on my list ina1620. But more importantly, it's CMOS. Jul 22, 2021 · I can't imagine the OPA1656 with an ESS unless some special whisperer secrets were applied. I’m going to solder the IC to a soic to dip adapter then plug it into the the amp. I put together a table below showing devices that have high input impedance and some key parameters for comparison. 3V inside of each supply. Of course there are a number of other factors to consider, like the ability to drive the input impedance of the following circuitry with low distortion Jun 8, 2023 · I read that many like OPA1656/1655 very much. OPA1642 sucks 1. Nov 20, 2020 · So, I generally would recommend replacing the LME49720s with OPA1642 or OPA1656- with a slight preference for the cheaper, lower current OPA1642. html#post6555025 that is saying that the OPA1656 is quite a bit noisier than the OPA1642 AT LOW The OPA1602 and OPA1604 bipolar-input operational amplifiers achieve very low 2. For example the OPA1678 has a much higher gain-bandwidth product than TL072 and different output impedance, which means that the criteria for it being stable (i. But I really like the FET's in that position. Tested a lot of OP, including LME49720, OPA1612, OPA1642, MUSES8920 and MUSES8820. 25 V to ±18 V (4. OPA1656 sounded worst, Muses 8920 sounded best. Dec 28, 2017 · There are some things to watch out for when swapping op amps. ••• The OPA1656 is the industry’s lowest voltage noise high voltage CMOS on the market. Thanks in Products Precision op amps (Vos<1mV) INA1620 — High-fidelity audio operational amplifier with integrated thin-film resistors and EMI filtering OPA130 — Single, 1-MHz, 20-pA bias current, 530-µA power, FET operational amplifier OPA131 — Single, 4-MHz, 50-pA bias current, 750-µA power, FET operational amplifier OPA140 — Single-channel, 11-MHz, low-noise 36-V JFET precision operational Mar 17, 2019 · Low output current would mean the transimpedance gain of the I/V circuit will be high, and the input current noise of the op amp will be a significant contributor. Sometimes the company decides to go from two letters to three in the part number and parts get stuck in the middle. Audio op amps-parametrics-20230616123008. We would like to show you a description here but the site won’t allow us. When we developed the OPA1656, this was also a major design target for us, and the designer and myself spent quite awhile in the lab with previous CMOS audio op amps (specifically OPA1652 and OPA1688) hunting for sources of input capacitance variation. It has to do with the load capacity limitation be under a certain load capacity of 50 ohms. Perhaps it's a further development. At least, OPA828 has proper JFETs at input. Mar 17, 2019 · I seem to recall that the OPA1642 is newer than the OPA1612. Normally, that's not newsworthy because higher performing parts are coming out all the time. However it draws quite substantial current when idle. I had no oscillations or instability with the OPA1656. 1-nV/√Hz noise, low THD+N (0. The OPA1642, however, is also LESS expensive ($2. Jun 14, 2023 · OPA1656. プライバシーポリシー 当サイトでは、以下のとおり個人情報保護方針を定め、個人情報保護の仕組みを構築し、個人情報保護の重要性の認識と取組みを徹底することにより、個人情報の保護を推進致します。 Products Precision op amps (Vos<1mV) INA1620 — High-fidelity audio operational amplifier with integrated thin-film resistors and EMI filtering OPA130 — Single, 1-MHz, 20-pA bias current, 530-µA power, FET operational amplifier OPA131 — Single, 4-MHz, 50-pA bias current, 750-µA power, FET operational amplifier OPA140 — Single-channel, 11-MHz, low-noise 36-V JFET precision operational Mar 17, 2019 · I replaced it with an OPA1642 and am sorry to say that there is a big difference sound-wise. (I believe). I did check OPA1656 in voltage regulators and didn’t like elevated LF noise (compared to JFET opamps). ti. Easiest is to replace LF351N and LF353N for the OPA134 and OPA2134 just like the shop in Idaho did. May 9, 2023 · Hello together, i want to put one of the mentioned OP Amps in my amp. r/audiophile is a subreddit for the pursuit of quality audio reproduction of all forms, budgets, and sizes of speakers. 00005% at 1 kHz. Mar 17, 2019 · We tried OPA1612, OPA1656, NE5532, and Muses 8920 opamps in Rohm BD34301EKV Evaluation Board (which came with 5532's installed). When I do serious listening test between them, just an A - B testing, not back and forth, I found the OPA1642 creates more noise at upper frequency because of those high frequency details. 3nV/rtHz) and distortion (-124dB), wide bandwidth (22MHz) audio op amp. 00005%), a low input bias current of 2 pA, and low quiescent current of 1. The OPA1641, OPA1642, and OPA1644 rail-to-rail output swing allows increased headroom, making these devices ideal for use in any audio circuit. Dec 6, 2018 · Just replace the original op-amp with one with a similar specification, if it's not possible to find an exact replacement. For OPA1642, the output current (limit) appears to increase with increasing temperature. OPA1656 The OPA1655 and OPA1656 (OPA165x) are Burr-Brown™ op amps designed specifically for audio and industrial applications, where maintaining signal fidelity is crucial. The OPA1641 (single), OPA1642 (dual), and OPA1644 (quad) series are JFET-input, ultralow distortion, low-noise operational amplifiers fully specified for audio applications. tiの最新オペアンプopa1656のサンプルを入手したので、動かしてみました。 このオペアンプは名前からわかるように旧BB系のオペアンプです。 OPA1642の後継のような位置づけのものですね。 • audio·phile: a person with love for, affinity towards or obsession with high-quality playback of sound and music. com and all are unity gain stable. The schematic, spectrum and results are given below. Are there any other Part Number: OPA1642 Other Parts Discussed in Thread: OPA1652. Since I am not interested in the V6 Vivid Dual that it comes with. 9‑nV/√ Hz voltage noise density and 6‑fA/√ Hz current noise density, allowing for very-low noise performance in a wide variety The OPA1641 (single), OPA1642 (dual), and OPA1644 (quad) series are JFET-input, ultralow distortion, low-noise operational amplifiers fully specified for audio applications. May 23, 2018 · Opa1642 sounds a bit smoother and silky at top end but a little bit fat in the mids. Mar 17, 2019 · OPA1656 rolling I tried in all cases to bypass the rails with a 0. Feb 11, 2021 · Below is a comparison between OPA1656 and OPA1642. 000015% at 1 kHz. Opa2156 sounds a little more "detailed" and a little "grainy" in comparison. I haven’t tried it for audio as outright replacing JFETs with CMOS looked like blasphemy to me. Nov 30, 2021 · Stability should be considered especially with the wider bandwidth of the OPA1656. 9‑nV/√ Hz voltage noise density and 6‑fA/√ Hz current noise density, allowing for very-low noise performance in a wide variety Mar 17, 2019 · The OPA1641 would be slightly better. Regarding the tone stack, if there is enough gain in the front-end, the input-referred noise may not be impacted by the resistances. Hi team, The following two sets of Output Voltage vs. The output swing for Aol should be considered as it is different between the two devices. See the LM4562 vs LME49720 for Jun 19, 2021 · The OPA1642 has more open at the high frequency, it is more detail but it noticeable sharp and edgy sound. The OPA1602 and OPA1604 series of op amps offer rail-to-rail output swing to within 600mV with 2kΩ load, which increases headroom and maximizes dynamic range. png. This is how I got a set of these including OPA1642 and OPA827. The OPA1656 immediately raised my attention, plus there was/is a long thread about it on diyaudio. 1F X7R on the backside with the shortest possible lead length. Old op-amps such as the LF412 and TL072 are more than good enough for 99% of audio applications. LME49720 vs OPA1612 vs Muses02. Mar 21, 2023 · The trade off would be noise vs stability. IMHO the outcome was mostly decided by how the opamps responded to the RF coming out of the dac chip. Opa1612 is generally slightly light weighted but very balanced otherwise. I also refurbish large format recording consoles. The OPA1656 has higher Iq but also higher gain bandwidth and very low THD+N. 4 nV/rthz. Dec 9, 2019 · Technically speaking, it's really hard to beat opamps like AD797, AD8599, OPA1612, OPA1656, so it might be safer to use one of these over the "exotic" ones, unless swapping opamps is really fun for you and you have enough money to spend on this hobby. 5 V to 36 V) on 3. OPA1642. 1-nV/√ Hz noise density with an ultralow distortion of 0. Other Parts Discussed in Thread: OPA1612, OPA1642, RC4136 I use these amplifiers for pro audio. Depending on the actual application circuit, there are alternatives with better noise performance. Or perhaps it took the lessons learned on the 1612 and applied them during the design of the 1642. For the MM design the overall gain is dropped by 20dB, 14dB in stage 1, 6dB in stage 2. Which of the two mentioned OP Amps (OPA1612 or OPA1656) is the better one, in a scientific point of view. 08 @ Mouser). xlsx The OPA1641 (single), OPA1642 (dual), and OPA1644 (quad) series are JFET-input, ultralow distortion, low-noise operational amplifiers fully specified for audio applications. common mode voltage that I've measured on any op amp. Two schematics in parallel and eight in parallel for both 1656 and 1642 were measured. The old 49720HA sounds more direct and dynamic than the newer SMD opamp. OPA1641-Q1, OPA1642-Q1 SBOS791A–JUNE 2017–REVISED NOVEMBER 2017 www. Best Regards, Chris Featherstone May 13, 2015 · NE5532 is dual channel opamp, so you can try few of these: opa2134, LM4562, opa1642, opa1656 without burning too much money on rolling opmaps. I am planning to replace the NE5532 in my Burson Funk with the OPA1656. The op amp offers a temperature range of -40°C to +125°C and is available in an 8-pin SOIC package. The OPA1655 and OPA1656 (OPA165x) are Burr-Brown™ op amps designed specifically for audio and industrial applications, where maintaining signal fidelity is crucial. 5-nV/√ Hz noise density with an ultra-low distortion of 0. Feb 11, 2021 · I agree about the OPA1612 for gain. This op amps offer rail-to-rail output swing to within 200 mV of the power supplies with a 2-kΩ load, which increases headroom and maximizes dynamic ran The OPA1611 (single) and OPA1612 (dual) bipolar-input operational amplifiers achieve very low 1. OPA1642 is its replacement despite the lower type number. 00003% at 1kHz. consists of 2 x 10 op-amps in parallel and the two 10s are balance connected. com (DIFF) Differential input voltage ±VS V IO Output short-circuit(3) Continuous May 15, 2022 · Buggle2 Riaa board. e. This is just a theory. OPA1656と同様に10kHzの歪みが少ないことが特徴です。 OPA1656と比較して消費電流が少ないですが最大出力電流も少ないです。 初段のノイズが増えていること，消費電力が減っていることから初段の電流を絞ったと思われます。 OPA2134 is good but it consumes more power than normal (8 to 10 mA per IC) and it is not rail to rail output. Got these when they first released them b4 the acquisition of LME from National. Two identical gain 11 amplifiers were tested. Mar 17, 2019 · The OPA1641 would be slightly better. I pick opamps specifically based on their sound from an subjective point of view, ther datasheets. Sep 27, 2019 · The OPA1656 operates over an ultra-wide supply range of ±2. NE5532 is a very good amplifier especially for the price ($0. It offers exceptional performance in almost any audio application. I have tried muse02, muse 8920 didnt feel they were worth the hype or price. com with a TI insider involved. Is the OPA1656 the correct opamp to use? I heard it was the best so that’s why I picked it. Aol opa1655 , opa1656 SBOS901C – MARCH 2019 – REVISED SEPTEMBER 2022 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, OPA1656 1/2 OPA1656 Input Output Pad Product Folder Order Now Technical Documents Tools & Software Support & Community An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. To check if they will match the previous ones that were made with balanced 10x paralleled op-amps. Except opa1656 rest of opamps are available on rsdelivers. The FET-input architecture achieves a low 2. I used 10 or 12 in my preamp rolling project - never a problem with TI’s OPA1662 is a Dual SoundPlus™ low noise (3. . My favorites at the moment opa1642 and this one opa1656. Sep 14, 2021 · Yes, the low pipe organ pedal notes down 'round 20Hz are rolled-off at 20dB/decade below that of the mid-band 1KHz level during the cutter/mastering process. Stage 1 changes the opamp to a OPA1641. I don't care about listening tests or something else, just want to use the technical better one in my amp. Mar 17, 2019 · From the data sheet, in comparison to the OPA1642, I see that the OPA1656 has slightly less voltage noise but also slightly more current noise; slightly faster and less THD, but worse CMRR. 5nV/√ Hz noise density with an ultralow distortion of 0. A forum member who used to work in development at National (and then got laid off after TI took over) tipped me off many years ago to try the metal can. There's no shortage of candidates here, and the new OPA1656 is a great option, but you could also check out: OPA1642, OPA1678, OPA827, and the newer OPA828, or also OPA2810. not going into high frequency oscillation) are different and just swapping ICs may cause problems -- you might need to add some compensation for the OPA1678, depending on Mar 17, 2019 · Here there are a number of options: BJT-inputs without bias current cancellation (OPA1622), Super-Beta BJTs (OPA2210), Low voltage noise JFET and CMOS (OPA1642, OPA827, OPA828, OPA1656/2156). And of course measurements will confirm that the part worked. The package types and pricing are also shown in the attached excel table. For the case of The OPA169x operational amplifiers achieve a new level of performance for low-power amplifiers with a low 4. Mar 17, 2019 · Noise OPA827 vs OPA1656. Below, I have highlighted the components that could be adjusted if this the issue. Mar 17, 2019 · Rolling opa1642, opa1612, muses8920, 2xopa627bp, lme49720na, opa2134. I had a vision in mind with the Modi 3+ and the OPA1656 happened to work and achieve this vision. Find parameters, ordering and quality information 1 10 100 1000 1 10 100 1k 10k 100k 1M 10M 9ROWDJH1RLVH6SHFWUDO'HQVLW\ Q9 ¥+] Frequency (Hz) C006 Product Folder Sample & Buy Technical Documents Tools & Software Dec 11, 2019 · Normally you'd regularily search in the manufacturers new product listings first for any new interesting products. Mar 17, 2019 · I measured again the noise of OPA1656 vs OPA1642. diyAudio Community diyAudio Mar 14, 2010 · Tubey, better late than never - I just replaced all NE5532 amps in Benchmark DAC1 with OPA1612 and play it so far for few hours. ounding-op-amps-lowest-thd-8. opa1655 , opa1656 SBOS901C – MARCH 2019 – REVISED SEPTEMBER 2022 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, We would like to show you a description here but the site won’t allow us. Output Current characteristic curves seem to behave in opposite manners. Any futher recommendations? my favs 1642/1656, 1612, lme49720na 2xopa627bp, ••• OPA2134 is probably a good choice in general. It's a killer OpAmp, and better suited to non-inverting buffer duties than the OPA1612/2211 The OPA1641 (single), OPA1642 (dual), and OPA1644 (quad) series are JFET-input, ultralow distortion, low-noise operational amplifiers fully specified for audio applications. To date, bipolar opamps have ruled when Mar 22, 2022 · I’ve known about the OPA 1612 when they were 1st released. If you have an account with TI, the OPA 1612 can still be ordered as samples. The specs on the opamp are really good, almost as good as the OPA1612 (and better in some ways that will be covered below). . The low voltage noise combined with the low current noise make this device great for low and high impedance applications such as a high gain microphone pre-amplifier. 5). 8ma quiescent current per channel - half as much as OPA2134,OPA1656 is the best boise performer now, but there many different purposes with different requirements. The OPA1652 and OPA1654 op amps offer rail-to-rail output swing to within 800 mV with a 2-kΩ load, which increases headroom and maximizes dynamic range. If a FET-input amplifier is required for low bias current (such as for a phono preamp), you might consider the OPA1642 or OPA1678. Dec 10, 2021 · This is my first time doing anything DIY with audio. But this time it's a bit more interesting. Hmmmm. Features include 5. Jul 4, 2009 · You are not “wrong“ in describing the Opa1656, it is recommended to be used in portable devices I/V stage because it has a input fet like the opa1612 and the opa1642. As long as your not using them for military purposes. For example, Aol for the OPA1656 with a 600 ohm load will have a linear output swing that is 1. In the meantime we will wait for the customers feedback on the component values in order to check the stability of each op amp below using the OPA1656. doenk yyhmy qhqc jtrkaf yzri zwoqvk leemzzr zrnest nfdfi mkn