Amplifiers forum - Recent Threads

OPA892: What is unity gain stable OPamp?

Abhi — Tue, 21 Jul 2026 15:08:05 GMT

Part Number: OPA892

I am planning to use OPA2892 as a buffer and an integrator. When I simulated this, I found that the circuit is not working. Again the circuit is working with OPA891. I found that this opamp is unity gain stable. I dont know what that means. For my application should i use these type of opamps? Could you suggest some model which has a low offset, high bandwidth, high slew rate of this type?

INA333-Q1: Temp sensing using

Nishant Gupta — Mon, 20 Jul 2026 14:38:59 GMT

Part Number: INA333-Q1

In this schematic My V+ is 5V which is coming from LDO but 5V reference i am using for Vref pin to give resistor divider as attached. that external 5V is generated by reference IC of 5V .Please suggest as LDO is having 5V at output i should generate 5V resistor divider 5V from refernce IC for that offset voltage to always go above ADC ground noise. So i should give from 5V or 5V LDO will also works fine or there will be any drift in measurement issue i will get using LDO vs Reference IC in this case.Please suggest as this Chain is for temperature measurement .

RE: INA333-Q1: Temp sensing using

Nishant Gupta — Tue, 21 Jul 2026 15:05:23 GMT

I asked difference between Reference bandgap reference IC of 5V to use for Reference pin as shown in schematic 5V generated by bandgap reference IC which to be put by OPAM buffer then to the references pin . Other option in my mind is 5V supply voltage I am giving using LDO so should I use same Ldo 5V for resistor divider ckt for reference Pin or not . And please tell as I am operating my INA33-Q1 at 5V using LDO I need to add TVS diode ?? If yes which type where bidirectional tvs diode breakdown voltage of ??

LM6171: LM6171BIMX/NOPB - Possible Failure

Darrell Mayfield — Wed, 15 Jul 2026 22:05:49 GMT

Part Number: LM6171

Summary from customer:

Error 7 is an error upon self-test. The device's stimulation output is verified before treatment. If it falls outside of a designated range, it returns Error 7. The schematic I attached has the stimulation generation circuit on page 4 and the parameter sensing circuit on page 5.

EWME3525-0035, EWME3525-0002, EWME3525-0016

0035 and 0002 came from the field. The analysis returned the following results:

0035

- Upon visual inspection, capacitor C36 was visibly bulging.

- Both current and voltage were below the threshold on self-test

- Upon installing the PCBA in a test unit and turning it on, U17 rapidly heated up.

- Replacing C36 and U17 fixed the PCBA and made it functional again.

0002

- Upon visual inspection, capacitor C36 was visibly bulging.

- Both current and voltage were below the threshold on self-test

- Replacing C36 and U17 fixed the PCBA and made it functional again.

RE: LM6171: LM6171BIMX/NOPB - Possible Failure

Jacob Nogaj — Tue, 21 Jul 2026 15:04:09 GMT

No worries, sorry for all of the IT issues on our side

Here is my email; j-nogaj@ti.com. Please feel free to reach out to me directly.

Thanks!

Best,

Jacob

RE: LM6171: LM6171BIMX/NOPB - Possible Failure

Darrell Mayfield — Tue, 21 Jul 2026 14:59:55 GMT

The platform is not allowing me to accept your friend request.

RE: INA333-Q1: Temp sensing using

Robert Clifton56 — Tue, 21 Jul 2026 14:57:18 GMT

Hi Nishant,

Just to clarify, the reference circuit should look like this:

As for the LDO, you do need to be careful. The ESD protection structure consists of ESD diodes on the input going to the supply rails. During any ESD spikes, you will need to have a path to ground from both supply pins. LDOs can rarely handle reverse current conditions, and we recommend including a TVS diode to ground, at the output of the LDO, to give an alternative ground path.

Best Regards,

Robert Clifton

RE: OPA211-HT: Forum ignored my message of "my issue not resolved"

nader niakan — Tue, 21 Jul 2026 14:55:49 GMT

Good Morning Chris,

Sure. Let me try that. Thanks.

OPA211-HT: Forum ignored my message of "my issue not resolved"

nader niakan — Thu, 09 Jul 2026 15:18:54 GMT

Part Number: OPA211-HT

Hi,

During testing Vos and IB for my newly purchased op amps (OPA211-HT & OPA2333-hT), I observed that my measurments were way above the datasheet parameter values. I discussed that at the Forum and I tried to make my circuits per their recommendation. But, still did not reach the datasheet values. After going a few times bach & forth, I think Forum gave up on me and left my issue unresolved. I notified them twice about my issue left off unresolved, but they chose to ignore my messages !!

I wonder if a higher authority can call me at 805-304-9109 and discuss the matter with me ? We are working on an important high temperature sensor project and that is why I have selected these two op amps, among many other high temperature op amps in the market. Thank You

OPA2333-HT: Vos of OPA2333-HT Does Not Meet Datasheet params

nader niakan — Tue, 14 Jul 2026 15:30:37 GMT

Part Number: OPA2333-HT

Sent to E2E Forum.docx

Print open the attachment to view my issue. Thanks

RE: OPA2333-HT: Vos of OPA2333-HT Does Not Meet Datasheet params

nader niakan — Tue, 21 Jul 2026 14:48:24 GMT

I just sent you a Friend Request

RE: OPA2333-HT: Vos of OPA2333-HT Does Not Meet Datasheet params

nader niakan — Tue, 21 Jul 2026 14:42:26 GMT

Ron,

Thanks. Let me try to send you a friend request.

RE: LM6171: LM6171BIMX/NOPB - Possible Failure

Jacob Nogaj — Tue, 21 Jul 2026 14:29:14 GMT

Hey Darrell,

In your user profile, you should see a notification that I sent a friend request.

Once you accept me as a friend on E2E, we can direct message each other.

Please let me know if you are able to see this friend request.

Worst-case, we could always email as well.

Thanks,

Jacob

RE: LM6171: LM6171BIMX/NOPB - Possible Failure

Darrell Mayfield — Tue, 21 Jul 2026 14:24:15 GMT

How do you direct message?

RE: LM6171: LM6171BIMX/NOPB - Possible Failure

Jacob Nogaj — Tue, 21 Jul 2026 13:53:37 GMT

Hey Darrell,

I worked to hide the schematic so well that I unfortunately failed to save a local copy on my computer that I can go back and reference.

I added you as a friend on E2E. Would you mind re-sharing the file with me through direct messages? I can annotate the schematic to show what I mean about the polarized capacitor.

Thanks,

Jacob

RE: LM6171: LM6171BIMX/NOPB - Possible Failure

Darrell Mayfield — Tue, 21 Jul 2026 13:40:07 GMT

From my customer:

We're not following the part where he says the negative lead of the cap is grounded.

We use AC in this part of the circuit (100kHz) not DC.

I don't believe there is any DC current being inputted into C36.

UC1524A: Online shop availability UC1524AJ / UC1524AJ883B

Ulli Krueger — Thu, 16 Jul 2026 16:25:17 GMT

Part Number: UC1524A

Hi TI-Team,

we are an OEM and several of our boards use UC1524AJ / UC1524AJ883B.
We normally buy our boards through EMS Provider but require now parts for repairs.
I assume as this component is not approved for new designs only legacy designs are able to order parts through your online shop.
I do not see stock but our EMS supplier does see more than 2000pcs. available.
Please add this account on the list for legacy designs aproved to buy the part through your online shop.

Thank you.

Best
Ulli Krueger

RE: UC1524A: Online shop availability UC1524AJ / UC1524AJ883B

Ronnie Koh — Tue, 21 Jul 2026 13:02:53 GMT

Hi Ulli,

I believe you can still order through TI.com. Have you tried logging into your TI account?

www.ti.com/.../UC1524AJ883B

OPA810: Product selection for a miniature low-noise front end for a ~1 MHz, 0.3 µV signal

Y Z — Tue, 21 Jul 2026 12:56:19 GMT

Part Number: OPA810

I selected OPA810 as the closest relevant part for routing purposes. We are currently seeking product selection guidance and have not finalized the amplifier architecture.

We are developing a miniature analog front end for detecting a narrowband signal at approximately 1 MHz, with an expected amplitude of around 0.3 µV at the electrode. The first-stage amplifier should be placed as close to the electrode as possible to minimize cable induced noise. We would appreciate recommendations on suitable TI low-noise amplifiers, instrumentation amplifiers, or integrated AFEs, as well as guidance on achievable input referred noise, gain architecture and package size.

UCC28051: High priority: Clarification required

sharmila Devi — Thu, 16 Jul 2026 05:59:07 GMT

Part Number: UCC28051

Hi Team,

Please provide the clarification for the part UCC28051D

What is the country of origin?
Please let me know what is the process node & Technology ?(for ex: CMOS, 80 nano meter (nm))

Awaiting for your response.

please do the needful at the earliest.

Thanks & Regards

Sharmila

RE: UCC28051: High priority: Clarification required

Hemanth Sreeperumbudur — Tue, 21 Jul 2026 12:40:53 GMT

Hi Sharmila,

Sorry for the delay.
We do not have the information requested readily available. Please allow us a day or two to get back with correct answers.

Regards
Hemanth

TLV170: zero created by the gain setting resistors and input capacitance of the device is greater than the bandwidth of the circuit.

sruthi siripuram — Tue, 21 Jul 2026 10:25:10 GMT

Part Number: TLV170

In Analog engineer op amp cookbook document of TI , for circuits inverting and non inverting and buffer and Summer circuits it is mentioned "zero created by the gain setting resistors and input
capacitance of the device is greater than the bandwidth of the circuit." and I am not getting how he defined this statement and condition. I need derivation of transfer function and justification for the condition and why zero should be out of bandwidth of operation.. Generally adding zeroes cause better stability as per control system know .. please resolve my issue..

BOOSTXL-AFE031-DF1: Support request: BOOSTXL-AFE031 FSK reference design - multi-byte packet design + fsk_corr_detector timing

Ayushee verma — Fri, 17 Jul 2026 12:02:47 GMT

Part Number: BOOSTXL-AFE031-DF1

Hello,

I am working with the TI reference designs boostxl_afe031_f28379d_dacmode (TX) and boostxl_afe031_f28379d_rx (RX), built on the [insert exact TI safety-oriented C2000 part number, e.g. TMS320F28379D], for a communication link within our system.

The reference examples send a single byte at a time. I would like to extend this to send multiple bytes per transmission and would appreciate guidance on two things:

1. Packet design guidance
What criteria should we follow to structure a multi-byte packet on top of this reference design (e.g. framing/synchronization approach, recommended maximum payload length, any built-in assumptions in the correlator about frame length or timing that we should design around)? We would like to keep the packet structure as simple as possible.

2. Chip pattern length (11 symbols/bit)
The reference design encodes each bit as an 11-chip/symbol pattern. Is this 11-symbol length a fixed requirement of the correlator design, or can it be reduced (e.g. to shorten overall frame duration for longer multi-byte payloads)? If it can be changed, are there minimum-length or pattern-design constraints (e.g. autocorrelation properties) we should follow?

3. fsk_corr_detector timing
As part of this work, we need to characterize the internal timing behavior of the FSK correlator component (fsk_corr_detector.c / fsk_corr_detector.h) - specifically the chip-decision latency and signal settle-time requirements after the final symbol of a transmission - since this directly affects how we frame a multi-byte packet reliably. Could you help with either of the following:
a. Access to the source for fsk_corr_detector.c (currently only available to us as a precompiled library), or
b. Technical documentation describing its internal timing/latency behavior, if source cannot be released.

4. General recommendation
More broadly, we would welcome any recommendations on the right approach to reliably extend this reference design from single-byte to multi-byte transmission - for example, whether TI has an existing multi-byte/packetized example built on this same correlator, or general best-practice guidance (framing, resynchronization within longer frames, error detection) for this hardware/library combination.

Reference designs in use: boostxl_afe031_f28379d_dacmode, boostxl_afe031_f28379d_rx
Part number in use: BOOSTXL-AFE031-DF1
C2000Ware version: 20.5.1.12__1.11.1

Thank you for your help.

Ayushee devi verma

RT Vision Technologies Pvt. lmt.

RE: BOOSTXL-AFE031-DF1: Support request: BOOSTXL-AFE031 FSK reference design - multi-byte packet design + fsk_corr_detector timing

Ayushee verma — Tue, 21 Jul 2026 10:18:21 GMT

Subject: RE: BOOSTXL-AFE031-DF1 Support Request — Multi-byte Packet Design (follow-up)

Hi Jacob,

Following up on your Part 3 questions about word length consistency and transfer pattern:

Word length (bits per symbol): fixed across all messages.
Message/packet length varies by message type. In our case, we expect a combination of:
- Periodic (cyclical) communication, where packets are transmitted at fixed intervals — this is the ~60-byte payload mentioned earlier
- Event-driven communication, where packets are triggered asynchronously based on system conditions, and are expected to be shorter — we're still finalizing the exact size and will confirm
Data transfer pattern: two-way — one direction is event-driven, the other is periodic at a fixed interval.

Please let us know if this mixed communication pattern would influence your recommendations for synchronization, framing, or preamble design.

Thanks,
Ayushee

PGA855: Need for PGA855 in 1000V sensing circuit using RES60A315QDWVRQ1 and ADS9217

Conor — Tue, 21 Jul 2026 10:05:27 GMT

Part Number: PGA855

Hi,

We are considering the following signal chain for a voltage sensing application in an AC power supply system:

1000V input → RES60A315QDWVRQ1 → ADS9217

The target sampling rate is around 250kSPS. Since ADS9217 has an integrated fully differential ADC input driver, we would like to know whether an external front-end amplifier such as PGA855 is required.

With RES60A315QDWVRQ1, the divided voltage is approximately 3.17V at 1000V input, which seems to be close to the ADS9217 input range.

Could you please advise on the following?

1. Can ADS9217 directly accept the output of RES60A315QDWVRQ1?

2. Is PGA855 required in this condition, or can it be omitted?

3. Are there any concerns regarding input impedance, settling, common-mode voltage, or RC filter design?

4. Are there any limitations when using ADS9217 at around 250kSPS?

5. If an external amplifier is recommended, should we use PGA855, THS4551, THP210, or another device?

Best regards,

Conor