Amplifiers forum - Recent Threads

LMH6518DESIGN-CALC: ibis model

Raneel Pammar — Sat, 06 Jun 2026 12:28:52 GMT

Hi
my name is Raneel.
we are using IC : LMH0397RTVR in our design.
please provide the ibis model to do signal integrity .
regards.
Raneel.

INA219: INA219 Back powering the application circuit/ MCU while powered down

Aloysious Benoy — Fri, 05 Jun 2026 19:23:04 GMT

Part Number: INA219

We have a product with the INA219 being solely used for bus voltage monitoring. The IN+ and IN- terminals are shorted together on the board since we don't want to use a shunt resistor or current measurements.
The input terminals (IN+ and IN-) of the INA219 are connected directly to the power source (a battery pack, 4S LiPo, ~15V at the time of the test). The INA219 is powered through an on board regulator supplying 3.3V

The issue is when the power switch is turned off (i.e V3V3 = 0, V_sys = 15V)), the INA219 seems to be back powering the main board (probably through ESD structures?). The issue does not show up on all the boards. So far 5/30 boards have shown this back powering issue. How can we mitigate this on the faulty boards (we have ~100 boards that we want to utilise).
Another observation is that the leakage does not occur when power is applied initially. The leakage only seems to start when power (V3V3) is applied to the INA219 and then removed (power switch on then power switch off).

OPA2387: OPAMP section for design review

AP — Fri, 05 Jun 2026 14:33:50 GMT

Part Number: OPA2387

Hello TI team,

I have designed buffer circuit with OPA2387DSGR. Inputs arte pressure sensor (0-5V output) and thermistor. Buffer output is connected to ADC ADS114S08IPBSR (please refer follwoing link for more information) https://e2e.ti.com/support/data-converters-group/data-converters/f/data-converters-forum/1651315/ads114s08-schematic-review-of-ads114s08ipbsr-and-opa2387dsgr?tisearch=e2e-sitesearch&keymatch=%20user%3A617902#

I have attached the schematic images and pressure sensor data. Please review the design and let me know the changes if any required.

LM2903-Q1: PCN History LM2903QDGKRQ1

Kevin Knox — Fri, 05 Jun 2026 13:59:02 GMT

Part Number: LM2903-Q1

We are currently having trouble testing these parts in our assembly with a lower voltage than we have previously had on older parts. Parts from 2022 seem to have a higher voltage than the 2026 parts that we have recieved. We would like a PCN history and any updates during this 2022 to 2026 timeframe.

TINA-TI_ENGLISH: .LIB files for INA600

Camille Faivre — Fri, 05 Jun 2026 13:39:03 GMT

Part Number: TINA-TI
Other Parts Discussed in Thread: INA600, DIFFAMP-EVM

Hello,

I would like to use the INA600 in a simulation and would like to know if you have the .LIB files and other modelisation files of either the TINA or Pspice software ?

Thank you very much,

Best regards,

Camille FAIVRE

LM4861: LM4861 we are using this audio amplifer ,wanted know which is the batch code on top of Ic how to know

Blessy Kunjumon — Fri, 05 Jun 2026 11:49:51 GMT

Part Number: LM4861

LM4861 we are using this audio amplifer ,wanted know which is the batch code on top of Ic how to know

INA826EVM: EVM CAD data and PCB size

AlexW — Fri, 05 Jun 2026 11:32:25 GMT

Part Number: INA826EVM

Hello

what is the PCB size of INA826EVM?

Where can I download the EVM CAD (Altium) data?

Thanks and regards

Alex

INA241A: INA241A2 input to output voltage delay

Emilien COULAUD — Fri, 05 Jun 2026 09:28:25 GMT

Part Number: INA241A

Hello,

Questions:

For an output pure sinus voltage of [0; 2,5]V of frequency in range [1;100] Hz, what is the delay of INA241x2 ?
What is the reason of difference in delay results between transient simulation et AC simulation, of INA241x2 PSPICE model (SBOMC92.ZIP) (refer to context) ?

Context:

I am currently designing the analog front end to measure current in a inductive load, driven by a PWM voltage signal.

My customer requirements specify a delay between :

Current in shunt
ADC input voltage

According to customer specification, globaly this current will be close to a pure sinus. With a frequency varying in range [1 ; 100]Hz.

As i plan to use the INA241x2, i looked into datasheet to find device specification of delay between shunt voltage to output voltage, for such sinus waveform.

So i decided to use manufacturer PSPICE model (SBOMC92.ZIP), with following results:

AC analysis: constant delay of 0,25µs (approx.) on [1;100]Hz
Transient:
- 1 Hz: 1,6ms
- 10 Hz: 160 µs
- 100 Hz: 16 µs

I am suprised about 2 facts:

AC analysis and Transient analysis seems not consistent
Transient simulation delays results

Remark: output voltage swing stay in [0; 2,5]V implying a signal maximum slope < amplifier slew rate indicated in datasheet

Thank you for your attention,

OPA192: Howland current source loop stability simulation of OPA192

li cunxu — Fri, 05 Jun 2026 07:15:35 GMT

Part Number: OPA192

Hi TI expert

The attachment shows the function of Howland current source amplification. How to simulate loop stability in this form? Thank you!

opa192 howland+mos.TSC

LM4811: Output noise issue

Govindaraj Tonape — Fri, 05 Jun 2026 06:07:45 GMT

Part Number: LM4811

We are using the LM4811MM audio amplifier IC in our design. We are facing an issue where noticeable background noise is present in the audio output, and the actual audio is not clear enough to hear properly.

Could you please suggest possible reasons or solutions for reducing this background noise?
Are there any recommended PCB layout guidelines, filtering components, grounding methods, or gain settings that we should check?

here is the circuit design:

INA128: Notation in the datasheet SBOS051G

Hiroaki Yuyama TED — Fri, 05 Jun 2026 02:49:04 GMT

Part Number: INA128

Dear, Instrumentation Amplifiers suport Team.

We have notified the customer of PCN#20260501000.1.
On page 5 of the INA128 datasheet Rev.G, aren't the SHE and FRE values for Long-term stability reversed?
And On page 8 of Rev.G, aren't the Slew rate and Settling time values for SHE and FRE reversed?
www.ti.com/.../ina128

Thanks & Best regards,

Hiroaki Yuyama

THS3217EVM: THS3217 Gain simulation vs real circuit

Justin Loo — Thu, 04 Jun 2026 21:46:29 GMT

Part Number: THS3217EVM
Other Parts Discussed in Thread: THS3217,

I am trying to cross verify the OPS stage for my THS3217 EVM.

I am using TINA TI for my simulations and a network analyzer for my THS3217EVM.

Below are my simulation results

Here are my results from my network analyzer

*the two sma connectors on the left(Vin+ and Vin-) are not connected to anything.

My simulation results in 8dB gain, while I get 6dB gain on the actual circuit. Is this reasonable?

OPA4322-Q1: Amp used in motor detection

Frank Cai — Thu, 04 Jun 2026 15:56:44 GMT

Part Number: OPA4322-Q1
Other Parts Discussed in Thread: OPA2322-Q1, , TINA-TI

Hi Team,

Customer is evaluating OPA2322-Q1 in their motor position detection and they are wondering:

Does OPA4322-Q1 use in motor position detection in other customer?
They use the following simulation and they found the result is good, however, when they went through this design in the real board, U1(Voltage follower) is not achieve to 1.65V, it is about 0.3V lower than expected, could you please help to check whether there are something wrong with the simulation? Thanks.

BRs,

Frank

LM741QML: Identify parts number JM38510/10101BGX

Tark Inukai — Thu, 04 Jun 2026 14:56:15 GMT

Part Number: LM741QML

Is this parts number a valid part number for TI? JM38510/10101BGX

TAS2557EVM: Adjusting TAS2557 voltage limiter via PurePath Console 3

Ali Q — Thu, 04 Jun 2026 14:41:05 GMT

Part Number: TAS2557EVM
Other Parts Discussed in Thread: TAS2557

I'm trying to either disable, or set the voltage limiter on the TAS2557EVM to 9V.

I go into the Device Control page, adjust the settings as needed, the notice on top says that "Changes made will be applied to device in Audio processing page" (can I just have an "Apply" button please?).

I return to TAS2557 home, open the "Tuning and Audio Processing" page, and based on the previous message, this should mean the changes are now applied.

The voltage limiter still kicks in and cuts off all output at the exact same measured speaker output level as it did when the voltage limiter was set to the default 7V5.

In addition, doing this sometimes completely kills audio until I run the System Checks again (it often hangs, forcing me to close and reopen the application or reboot my PC).

Based on the datasheet, there doesn't seem to be a way to disable the voltage limiter by writing to a register via direct i2c either.

Any advice?

INA851: INA851 Input Common-Mode Range issue for 6.7 Vrms Signal with ±5 V Supply

Manikandan Velayudham — Thu, 04 Jun 2026 13:10:54 GMT

Part Number: INA851
Other Parts Discussed in Thread: ADS131E08

Hi Experts,

We are evaluating the INA851 for a signal conditioning application and need your technical guidance regarding the input common-mode voltage range and device suitability.

Our application details are as follows:

Input signal: 6.7 Vrms, 400 Hz
Required input impedance: (>1Mohms), higher is acceptable
Available amplifier supply: plus 5 V and minus 5 V bipolar supply
Required gain: less than 1, preferably around 0.2 to 0.3
ADC interface: ADS131E08 with plus 2.5 V and minus 2.5 V analog supply and 2.5 V internal reference
Output requirement: ADC-compatible differential signal

Initially, we considered using INA851 because it supports gain below 1 and provides a fully differential output. However, after reviewing the input common-mode voltage limitation, we are concerned that the INA851 may not support our input signal directly when powered from plus 5 V and minus 5 V supplies.

For a 6.7 Vrms input signal, the peak voltage is approximately 9.48 V peak. Even if the signal is applied differentially, each input pin may still see a large voltage swing with respect to ground or common-mode. Based on our understanding, this may exceed the valid input common-mode or input linear operating range of the INA851 on plus 5 V and minus 5 V rails.

Could you please confirm the following points?

Can INA851 directly handle a 6.7 Vrms input signal when powered from plus 5 V and minus 5 V supplies, if the required output gain is set to around 0.2 to 0.3?
How should we correctly calculate the allowed input common-mode range for INA851 for this condition?
Is passive attenuation required before INA851 to keep the input pins within the valid common-mode and input voltage range?
If INA851 is not suitable for direct connection, can you recommend any TI device that can meet the following requirements?

High input impedance
plus 5 V and minus 5 V supply operation
Input signal up to 6.7 Vrms at 400 Hz (If upto 18Vrms extremly good)
Gain below 1, around 0.2 to 0.3
Differential output suitable for ADS131E08 ADC input

If no amplifier can directly support this input condition on plus 5 V and minus 5 V supplies, could you suggest the recommended TI front-end architecture for this application?

Our present understanding is that a high-impedance passive divider may be required before the amplifier to bring the input signal within the allowed input common-mode range, followed by INA851 or another ADC driver stage. We would like to confirm this with TI before proceeding with the design.

Please let us know if you need our schematic or additional input signal details for further review.

Thanks and regards,
Manikandan V

TLC3702: TLC3702IDR Product Inquiry

yingjiao LI — Thu, 04 Jun 2026 12:26:49 GMT

Part Number: TLC3702

Hello

We conducted X-RAY tests on different batches of this product and found that the internal bonding lines and the framework were not consistent. Could you please help us determine if this is normal? We also noticed differences within the wafer. What does the marking "TLC3702B" on the wafer represent?
Could you please help confirm whether the above differences are normal and explain why there are differences among different batches?
Thank you!

THS4503: Settling Time Simulation failure

Xabier Zuñiga — Thu, 04 Jun 2026 10:52:20 GMT

Part Number: THS4503

Good afternoon,

I am developing a mixed signal PCB which implements the ADC LTC2291.

I have selected the THS4503 as the driver of the ADC, and after trying to simulate the settling time using TINA TI i have stumbled upon a problem i can not seem to solve.

I sized the differential RC filter to comply with the acquisition time (tacq = 25ns since my fs = 20 MHz) setting the maximum allowable error to 1/2 LSB = 244 uV as my VFS = 2V.

The THS4503 is configured with gain = 1v/v and utilizes feedback compensation capacitors.

To simulate the settling time i have followed the TI-Precision Labs series on FDAs.

My simulation consists on feeding +2v DC voltage to the non-inverting input of the THS4503 with VCC = +5V, VEE = 0V and VOCM = +1.5V. At the end of the chain i convert from Diff to Single ended using a VCVS and subtract 2V (which is the expected result) from the single ended simulated value.

According to the simulation results the error voltage is 9mV which is by far much greater than my allowable 244 uV (around 41 times more). Hence, im wondering if the procedure im following to simulate the settling time is correct. Moreover, im not so sure about the GBW of this device. I read that according to TI the UGBW of the FDA should be around 4 times the pole frequency of the RC filter which im not totally complying as the fp in this case is around 132 MHz, and the gain product bandwidth of the THS4503 is described as 370 MHz.

I attach the schematic and simulation pictures for clarification.

Thanks beforehand

TAS5756M: add App (for TAS5756M) in PurePath Console

Johannes Wernicke — Thu, 04 Jun 2026 10:30:58 GMT

Part Number: TAS5756M

Hi,

After requesting PurePath Console I received and installed it. I understand it is an environment in which I can install apps for various devices. I am not sure how to get the app for the TAS5756M in my case.

Do I need to request the access to the apps seperately? Within the console I cannot add EVM apps myself (contact TI team for Access to apps). I would be glad if someone could point me in the right direction.

Also: Can I program it offline (with no connection to the chip or eval board) and load the resulting configuration file onto the TAS5756M afterwards, or do I need to establish a connection in order to program it?

Thank you in advance, Johannes W.

TAS6684Q1EVM: I'm missing the PurePath application for the TAS6684-Q1EVM

Enrique Hernandez — Thu, 04 Jun 2026 08:33:43 GMT

Part Number: TAS6684Q1EVM

Hello TI Team,

After starting PurePath, I was able to install the evaluation app for the TAS6584. However, when comparing the TAS6684 set up guide, it seems that a real time measurement window should be available to the user.

Right now I only access to the options on the attached file. I have signed-in into the PurePath console to see additional EVM apps but I can't seem to get the one for the TAS6684. What am I missing right now?

I appreciate your assistance on this issue!

Best regards,

Enrique Hernandez

OPA171: TI | MY01 Masimo - MS18981 // MPN# OPA171AIDBVR // MSL Issue

ZhiXin Chooi — Thu, 04 Jun 2026 03:40:22 GMT

Part Number: OPA171

Hi TI team,

3ku of MS18981, MPN# OPA171AIDBVR received from TI under PO# 1852219970.
However, physical received with Moisture Sensitivite Level 1 but datasheet shows MSL 2.

Seek help to check and confirm the actual MSL for this item.

Physical:-

Datasheet:-

THS4509: THS4509 : Can I get a s-para file for simulation in cadence environment?

Beomyu Park — Thu, 04 Jun 2026 00:31:26 GMT

Part Number: THS4509

Hi all

I'm using THS4509 amplifier to measure my DUT.

And i want to simulate my measurment setup in cadence environment.

To do simulation, I need s-para file of THS4509.

Can i get a S-para file?

thank you for your supports.

LMP8603-Q1: Minimum Gain Setting

Jessica Riley — Wed, 03 Jun 2026 23:12:33 GMT

Part Number: LMP8603-Q1

Hello,

I would like to use the LMP8603-Q1 current sense amplifier in a system which has a variable current range (0~25mA, -1.5A~1.5A). I would like to use the ability to reduce the gain by switching in the resistor from A1/A2 to ground. For the lower current range 0~25mA, it will keep the resistor disconnected so the gain is 100. For the higher current range -1.5A~1.5A, it will connect a 2.7kOhm resistor which should drop the gain to ~2.6 if my calculations are correct.

Is there any issue using the current sense amplifier in this way?

INA220-Q1: Query Part Specific Information via I2C/software

Kyler Carson — Wed, 03 Jun 2026 18:45:22 GMT

Part Number: INA220-Q1
Other Parts Discussed in Thread: INA220

Hello,

I am evaluating this part for use in a new board design and need to be able to verify the authenticity/identity of the device via its I²C interface.

Are there any registers that expose a part number, manufacturer ID, lot number, or other unique identifier that can be read over I²C? I reviewed the datasheet but did not see any device-identification registers documented.

Thank you,
Kyler Carson

TAS5825M: Time alignment of TAS5825m amplifier output signals

marcelo vercelli — Wed, 03 Jun 2026 17:25:21 GMT

Part Number: TAS5825M

Hi there,

We have an amplifier design using four TAS5825m chips and fed by a TDM8 signal.

The board is up and stable and we have no audio performance issues.

The application requires "bit correct" alignement of the output signals and we noticed that we have differences on certain channels relative to time.

Is there any way to adjust the time delay on a channel?

We have searched inside Pure Path but didn't find a delay tool.

Our application incorporates a cross talk cancellation function and time arrival is critical.

Many thanks,

Marcelo Vercelli