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OPA857: ERROR: Node 1:I0:I5:I19:1:102 is floating and connected to current source G:1:I0:I5:I19:1:RA

January 15, 2025, 5:11 pm
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Other Parts Discussed in Thread: OPA858, OPA857

Tool/software:

I'm getting this error when simulating the OPA857 model in LTSPICE. I saw the very similar thread about the OPA858, and I tried adding 10 MOhm resistors between each node and ground, but that did not fix the issue.

* TIA Basic Test
.INCLUDE "C:/Users/piyus/Downloads/sbombp8/opa857.lib"

V_IN p 0 PULSE(3 1 0 10p 10p 1u 2u 100)
R p TIA_IN 100000
VCTRL CTRL 0 3.3
VS_TIA VS 0 3.3
X1 CTRL 0 TIA_IN TIA_OUT TIA_OUTN VS OPA857

R1 TIA_IN 0 10000000
R2 TIA_OUT 0 10000000
R3 TIA_OUTN 0 10000000
R4 CTRL 0 10000000
R5 VS 0 10000000

.PROBE I(V_IN)
.PROBE V(TIA_OUT)
.PROBE V(p)

.tran 0.0001ms 0.005ms

.END
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TLV9054: Monolithic or non-Monolithic

January 15, 2025, 5:20 pm
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Part Number: TLV9054

Tool/software:

Hi team,

Could you pls let me know if  below devices are monolithic or not.

TL084HIPWR
TLV9054IPWR

Thanks

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TPS562201:TPS562201DDCR REN (EN pin resistance to GND)

January 15, 2025, 5:45 pm
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Part Number: TPS562201

Tool/software:

Due to the data sheet update, the REN has changed.
Changes from Revision B (September 2020) to Revision C (April 2024)

It seems that REN (EN pin resistance to GND) will change from Max 900Ω to 2400kΩ,and in order to suppress the inrush current on the power input side, I am trying to take measures by adding a capacitor (10μF) to the EN terminal to groundand delaying the output current, but will this have any impact due to the change in the internal chip?

E.g. on output timing and immunity resistance.

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INA228-Q1: The input current of VBUS pin under current measurement mode

January 15, 2025, 7:08 pm
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Part Number: INA228-Q1

Tool/software:

If not in VBUS measurement mode, such as in current measurement mode or shutdown mode, what is the input impedance of VBUS?

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AMC1351-Q1: Design around the Differential to Single-ended Conversion OpAmp

January 15, 2025, 10:18 pm
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Part Number: AMC1351-Q1
Other Parts Discussed in Thread: TLV313-Q1

Tool/software:

I am designing a circuit to detect voltage with a detection range of 800V through isolation using the AMC1351-Q1.

I am considering the circuit constants using the "IsolatedAmplifierVoltageSensingExcelCalculatorRevC.xlsx". Could you please provide guidance on the design around the Differential to Single-ended Conversion OpAmp?

Assuming the use of TLV313-Q1 as per the reference circuit diagram 8-3 in the AMC1351-Q1 datasheet, should I input the values of OPA Input Offset and OPA Offset Drift from the TLV313-Q1 datasheet, which are 0.75mV and 2.00 µV/°C?

I would like to know the design method for the reference voltage.

The calculated Reference Input Offset Voltage from the calculation sheet is 13.25mV. Should I determine the reference voltage divider resistors R3 and R4 to achieve 13.25mV?

Additionally, if you have recommended components for the Ref power supply op-amp and the Differential to Single-ended Conversion OpAmp, please let me know. Is it okay to use TLV313-Q1 for both?

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INA332: INA332

January 15, 2025, 10:38 pm
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Part Number: INA332

Tool/software:

The gain of the INA332 is not getting set precisely!

the input difference and the Output with respect to it  is never as per the formula given. 

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OPA192: Pspice - Temperature Analysis error

January 16, 2025, 1:11 am
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Part Number: OPA192

Tool/software:

Hi,

the Temperature Analysis for the shared circuit is resulting in 50% deviation for change in temperature.

for Resistors, TC1 = 0.02, and TC2 = 0.0045

kindly share, what could be the issue and how to resolve.

attached circuit and result files.

e2e.ti.com/.../Circuit-and-Result_5F00_Files.zip

Pspice for TI version

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OPA855: I have a dc bias problem when use opa855 as C-TIA

January 16, 2025, 2:47 am
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Part Number: OPA855
Other Parts Discussed in Thread: OPA277

Tool/software:

I'm currently testing a C-TIA circuit using the OPA855.

I'm experiencing a DC bias issue in my test setup. The non-inverting input of the OPA855 has a bias of 3.8V, while the inverting input has a bias of 3.2V.

I believe this 0.6V difference in input bias is causing the OPA855 to saturate. However, the OPA855's output has a DC bias level of 3.4V.

Can anyone explain why this situation is occurring and provide guidance on how to achieve the desired 3.8V output DC bias level?

I'm using an OPA277 to generate a 3.8V DC bias voltage in my circuit.

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OPA659: Regarding the Input and ESD Protection of the OPA659

January 16, 2025, 2:56 am
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Part Number: OPA659

Tool/software:

The absolute maximum rating for the input voltage of the OPA659 is ±Vs.

According to "8.2.1 Input and ESD Protection" on the datasheet, there is a protection diode at the input to prevent voltages above Vs + Vf from being applied.

Even if there is a protection diode, a voltage that is Vf greater than the rated voltage will be applied to the input. Is this ok? If it is applied for an extremely short period of time, like ESD, is it ok?

Please let me know the value of Vf and how long it is okay to exceed the rated value without any problems.

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TLV369: Negative Voltage measurement using ADC

January 16, 2025, 3:31 am
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Part Number: TLV369

Tool/software:

Hi everyone,

I'm trying to measure a -15V output from a DC-DC converter using the inbuilt ADC of an MCU, which operates on a 0-3.3V range. To scale down the voltage, I plan to use a TLV369 op-amp powered by 0V and 3.3V (no negative rail available, and I prefer not to add one).

How can I design the circuit to measure the -15V effectively with these constraints?

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AMC3330-Q1: AMC3330QDWERQ1 & AMC3301QDWERQ1 weight information request

January 16, 2025, 4:08 am
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Part Number: AMC3330-Q1

Tool/software:

Hello,

Is it possible to get the weight/mass (mg) information for following 2 components:

AMC3330QDWERQ1

AMC3301QDWERQ1

Thanks & regards,

Pawel

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AMC23C12-Q1: AMC23C12QDWVRQ1 & AMC23C14DWVR weight information request

January 16, 2025, 4:11 am
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Part Number: AMC23C12-Q1

Tool/software:

Hello,

Is it possible to get the weight/mass (mg) information for following 2 components:

AMC23C12QDWVRQ1

AMC23C14DWVR


Thanks & regards,

Pawel

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OPA627: OPA627B

January 16, 2025, 5:10 am
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Part Number: OPA627

Tool/software:

Hi,

What would be the noise specs of 4 OPA627 in parallel, and what would be CMRR, PSRR, input current noise degradation that will arouse because of this? How much would be the change in differential and common mode resistance and increase in input capacitance?

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LM2917-N: LM2917-N

January 16, 2025, 5:47 am
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Part Number: LM2917-N

Tool/software:

Hi,

I want to design a tachometer using LEDs with dedicated hardware but not MCU(I already tested with MCU and it worked fine)
Following is that data coming from engine source

  • Frequency = 30 to 400Hz
  • Hz = RPM/20
  • Voltage = 12V square pulses

I found this circuit on internet that do exactly the same according to that website but I need some confirmation that will it work especially about passive components(or if there is any EVM or reference design available to follow)

Thanks

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TLV1831: TLV183x PSpice Model model pinning

January 16, 2025, 9:27 am
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Part Number: TLV1831
Other Parts Discussed in Thread: TINA-TI

Tool/software:

Hello everybody,

I just dowloaded the TLV183x PSpice Model

Comparing to the datasheet, there are some "extra" pins.

What are VCCI VCCO VEE function ?

Thanks a lot in advance for your valuable help.

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OPA659: What voltage is allowed at the exposed thermal pad?

January 16, 2025, 9:55 am
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Part Number: OPA659

Tool/software:

Hello,

I have designed a device using the OPA659IDRB in the 8 PIN VSON package. I supply the OPAMP with +VS=6V and -VS=-6V. The thermal PAD is connected to ground. The amplifier OPA659 works well and the device is now in series production.

Now I read the datasheet again and found at the end of the datasheet, that the expose thermal pad should be connected to the most negative voltage of the OPAMP and this is -VS. But this is not in the specification part of the datasheet, so I assume, that this is a recommendation and there is no specification.

Next I took a multimeter Fluke 187 and measured the resistances between the expose thermal pad and the supply pins +VS and -VS. I measured the resistances with both polarities and the measured resistances were all above 100MOhm. So I assume, that the exposed thermal pad is isolated from the rest of the amplifier.

Is there any specification concerning the maximum voltage at the exposed thermal pad relative to the supplies +VS and -VS?

Do you see any quality problems of the OPA659IDRB, if I supply +VS=6V, -VS=-6V and the thermal pad is at ground and not at -VS?

Thanks,
Friedrich Kaufmann

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IVC102: Long-term support

January 16, 2025, 11:40 am
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Part Number: IVC102
Other Parts Discussed in Thread: ACF2101,

Tool/software:

What is the long-term outlook for the IVC102?  I'm designing a product with 96 integrator inputs, and I would like to be able to support it for 2030 and beyond.  I posted the same question about the ACF2101 and was told to "consider alternatives".  The IVC102 is one alternative that I am aware of.  Are there others?

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TLV9061: What is the difference between datasheet version SBOS839L and SBOS839M?

January 16, 2025, 3:30 pm
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Part Number: TLV9061

Tool/software:

One of my customers uses TLV9061IDBVR and TLV9061SIDBVR for their current products.

Recently, they received PCN about TLV9061 datasheet.
The PCN says that TLV9061 datasheet was updated from SBOS839L to SBOS839M.
And SBOS839M says "Changed TLV9061S DBV(SOT-23) pinout drawing to match the Pin Functions table".
We looked for the difference between these datasheets and found the difference on TLV9061SDBV shutdown pin name.
In SBOS839M, the pin (No.5 pin of TLV9061S DBV) name is "SHDN". But the pin name is "/SHDN" in SBOS839L.

Is the difference between both datasheets this pin name?
If it is yes, "SHDN" pin is not described in the pin function table of TLV9061.
Could you please tell me the difference between both datasheets?

Your reply would be much appreciated.

Best regards,
Kazuya.

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INA237: Vshunt error

January 16, 2025, 5:53 pm
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Part Number: INA237

Tool/software:

 in our design，IN237 use for two optional bus V/I/P monitor，see as below figure

48VBUS is floating ，monitor 12VBUS current ，but there is a big monitor error（monitor 2.5A,actual 3.8A） due to 48VBUS Rshunt circuit （2mohm/10R /10R ），remove those part can cancel this error

I want to root cause this issue so i need more detail for INA237's differential current sense architecture ，could you help ？or could you help to explain

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Why THP210 is sensitive to the noise on Vs-

January 16, 2025, 9:44 pm
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Part Number: THP210
Other Parts Discussed in Thread: TINA-TI

Tool/software:

Hi Team,

 

Please advise me on my question bellow.

 

Before I show you my questions, please let me explain the background of this question.

I am using THP210 with 5V single pole power and noticed that the

THP210 is sensitive to the noise on VS-, another word the GND.

So, I tried to duplicate this situation using TINA-TI and probably

observed the symptom.

 

Referring the simulation results, LMH210 output shows the unexpected noise

when the noise pulse on Vs- was coincide the low period of the source signal.

 

Question 1.  Do you think this is the expected result?

Question 2.  If so, can you let me know why LMH210 show this behavior?

Question 3.  Are there may workaround to fix this problem?

 

e2e.ti.com/.../THP210_5F00_in_5F00_tmp02.TSC

Mita

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