Amplifiers forum - Recent Threads

OPA656: Peak Detector (2MHz) does not function

Vishal Joshi29 — Tue, 05 Oct 2021 22:12:21 GMT

Part Number: OPA656

Hi,

I am trying to build Peak Detector for 1V 2MHz signal using OPA656. I want to use +-5V supply instead of +-2.5V. Same circuit works with OPA356 but not with OPA656.

Why does OPA656 behave differently than OPA356?

Thank you.

Regards,

Vishal

RE: OPA656: Peak Detector (2MHz) does not function

Michael Steffes — Thu, 07 Oct 2021 13:29:37 GMT

Well when I bring that file in the negative supplies are not connected and should be -5V on the polarity shown

RE: OPA656: Peak Detector (2MHz) does not function

Vishal Joshi29 — Thu, 07 Oct 2021 13:19:22 GMT

Hi Michael,

Tina Version: Version 9.3.200.277 SF-TI

File atached.

e2e.ti.com/.../peak-detector-circuit.TSC

Thank you.

Regards,

Vishal

INA219: INA219 power dissipation

Mark Chen52 — Thu, 07 Oct 2021 13:14:03 GMT

Part Number: INA219

Hi Team,

Customer would like to know the power consumption about the INA219BIDR, can I calculate it with below under 25 degree of room temperture?

Rja=111.3,

Tj= 150

150=25+111.3*Pd.

maximum Pd = 1.12W.

so the this device maximum power loss is 1.12W, is that correct? or you have any comments?

Regards,

Mark

OPA657: OPA657 Noise calculation as TIA

Tengfei Zhang — Sat, 02 Oct 2021 15:00:17 GMT

Part Number: OPA657

Hi team,

I want to use OPA657 as a TIA circuit. I need to calculate the noise for OPA657 TIA circuit.

Q1: In the datasheet, I cannot understand" Equation 9" as below:

What is the F value in Equation 9 ? F=f =sqrt(GBP / 2 R C) Hz

Q2: How to calculate CD in Equation 9?

RE: OPA657: OPA657 Noise calculation as TIA

Tengfei Zhang — Thu, 07 Oct 2021 13:05:33 GMT

Hi Sima,

I have get the TIA noise calculation. In my application, I have estimated my TIA OPA320 circuit output noise= 480uV. It is a lagre value.

I want to use RC low pass filter to reduce the noise.

1. I want to confirm the Noise Bandwidth when I use RC low pass filter on OPA320 output pin. The new Noise Bandwidth=1.57*1/(2*3.14*RC)?

2. If the 1st step is correct, I can use the new Noise Bandwidth to recalculate the OPA320 Output noise?

I can use the new Noise Bandwidth instead of the formula Noise Bandwidth for PPT page41- page44? Then get a new output noise.

3. In my application, I need to use the TIA output value to as the input signal to design a G=100 phase amplification.

If TIA OPA320 output total noise=100uVrms, How to calculate the output noise for only TIA as the input voltage?

RE: OPA656: Peak Detector (2MHz) does not function

Michael Steffes — Thu, 07 Oct 2021 12:54:53 GMT

You are not inserting the TINA files so hard to know which model rev you are using,

You should check the DC input bias current for the two models into the V+ node.

Oddly, I went into the OPA656 web folder - not TINA model there anymore - there are of course models around but not sure where you got yours?

RE: OPA388: About the conditions of high temperature and high humidity test(THB).

Kengo.Y — Thu, 07 Oct 2021 12:29:54 GMT

How much input voltage is the V+/V-?
What type of input signal for IN+/IN=?

I'd like to know the test conditions of HAST.

Sincerely.
Kengo.

OPA388: About the conditions of high temperature and high humidity test(THB).

Kengo.Y — Wed, 06 Oct 2021 01:47:22 GMT

Part Number: OPA388

Hi team,

My customer wants to try the high temperature and high humidity test(THB).
Could you tell me the test condition?
I think that it should be carried out under the test conditions of the data sheet with JEDEC.

Sincerely.
Kengo.

OPA392: Noise calculation for OPA392

Tengfei Zhang — Sat, 02 Oct 2021 15:29:33 GMT

Part Number: OPA392

Hi team,

Q1: Use OPA392 as the differential circuit, How to calculate the output noise as below? Can you send me a detail steps?

Q2: How to calculate the total output noise as below?

Is the total output noise correct? G2 is the differential circuit Gain,G2=1, Is this correct?

RE: OPA392: Noise calculation for OPA392

Tengfei Zhang — Thu, 07 Oct 2021 12:29:01 GMT

Hi Marek,

Why don't multiply by gain? Gain=2, That is 212nV*2=424nV, 369nV*2=738nV. Correct?

TL082-Q1: TL082QDRQ1

Hazel Sun — Thu, 07 Oct 2021 12:07:07 GMT

Part Number: TL082-Q1

Hi all，

The VCOM output waveform was dropped and the voltage drop improved with the VOUT foot plus 10K pull-down resistor， what is the principle？

thanks

INA220: INA220 and INA226 - Device ID

Ella KIM — Thu, 07 Oct 2021 09:45:45 GMT

Part Number: INA220

Hi Team,

I believe there will be a device ID register of INA220 and INA226. I cannot find it in datasheet. Could you let me know the address of the register and the device ID value for each device?

Thanks!

TRF37A75: Is TRF37A75 suitable as an FM radio frequency amplifier?

Downey Kim — Thu, 07 Oct 2021 09:29:05 GMT

Part Number: TRF37A75

Hi TI experts,

We want to use RF AMP because our product has poor FM radio reception sensitivity.

FM radio frequency is 75~108Mhz.

1. Is TRF37A75 suitable as an FM radio frequency amplifier?

2. Does TI have a dedicated RF AMP for FM frequencies?

3. Are there L,R,C values suitable for 75Mhz ~ 108Mhz amplification? (Based on TRF37A75 basic circuit)

Thanks!

Downey Kim.

INA236: Start-up time

Kazuki Kuramochi — Thu, 07 Oct 2021 09:07:20 GMT

Part Number: INA236

Hello Expert,

I'd like to know about this device's start-up time as like as INA237's device start-up time(TPDR)
Would you provide this parameter?

Best regards,
Kazuki Kuramochi

DP83620：CRS_DVpin in MII mode setting

Kenji Ohno1 — Wed, 29 Sep 2021 13:09:47 GMT

Part Number: DP83620

Hi Team,

A link error occurs once in five times during RESET operation.

I have it set to MII mode, but the toggle waveform is being output from CRS_DVpin.

For some reason, it may be operating in RMII mode.

RX_Dvpin is fixed at Low.

Do you have any advice ?

Regards,

Kenji

RE: DP83620：CRS_DVpin in MII mode setting

Kallikuppa Sreenivasa — Thu, 07 Oct 2021 09:04:36 GMT

Hello Kenji-San,

Thank you.

Regards,

Sreenivasa

RE: LM148QML: Maximum Output swing voltage

suresh bagewadi — Thu, 07 Oct 2021 08:30:00 GMT

Hello,

cost of TLE2071MJGB is high and also high lead time.

Requesting you to please review above circuit, by putting two no series diodes(1N914) in +ve supply part to reduce the +ve supply by 1.4V i.e, net supply voltages are +13.6 and -15V, which resolves my problem.

Let me know any technical issue/ Reliability issues with above concept.

Thanks

LM148QML: Maximum Output swing voltage

suresh bagewadi — Thu, 19 Aug 2021 06:42:02 GMT

Part Number: LM148QML

Dear Sir,

we are using LM148 in our project and we are facing output swing issue.

It is simple inverting amplifier with resistor value 500KOhm with 100kOhm load and supply voltages +/- 11V.

Case 1 : I/P DC voltage -11V output is 10.3V

Case2 : I/P DC voltage 11V output is -8.7V... output is saturating at -8.7V

Please guide me to resolve the issue.

RE: AMC3330: CB Test report

Matiss Lucis — Thu, 07 Oct 2021 08:27:37 GMT

Somehow this link was not pasted properly: https://e2e.ti.com/support/sensors-group/sensors/f/sensors-forum/980725/tmcs1100-request-safety-related-certification-schedule/3633312?tisearch=e2e-sitesearch&keymatch=2D00_Original-TMCS1100-IEC-Test-Report11.pdf#3633312 so here is the full link.

AMC3330: CB Test report

Matiss Lucis — Tue, 05 Oct 2021 15:38:36 GMT

Part Number: AMC3330

Hello,

I'm looking for a CB Test report and CB Test Certificate for AMC3330. Is it available somewhere on a webpage and I just can't find it?

Thank you in advance.

RE: AMC3330: CB Test report

Matiss Lucis — Thu, 07 Oct 2021 08:25:21 GMT

Hi Alexander,

I asked also UL for this test report, but they say that TI is the holder of this document.

Regarding TMCS1107 I found it also on TI forum where someone was asking for this report for similar needs. Here is the link to that particular thread: e2e.ti.com/.../3633312

RE: DP83620：CRS_DVpin in MII mode setting

Kenji Ohno1 — Thu, 07 Oct 2021 08:21:49 GMT

Hi Sreenivasa-san,

Sorry for the late reply.

No response from the customer yet.

I would like to follow up with the customer.

Regards,

Kenji

RE: INA226: INA226AIDGST

Bhadresh Patel — Thu, 07 Oct 2021 07:42:56 GMT

We are use this IC multiple places but shunt register value reading is different but we have used 0.001E in all IC so why its reading different hexadecimal value ??

check below one for more refrence

All shunt register value different

INA226: INA226AIDGST

Bhadresh Patel — Tue, 05 Oct 2021 12:39:19 GMT

Part Number: INA226

We are using the INA226AIDGST power monitor IC in our design and we are reading power and current register value which are not satisfactory so find below attached image as well as our max current and voltage table.

suggest how to slove this problem.

R3507 Current sense value is 0.001E and INA226 communicate through I2C with FPGA Board.

Voltage and current table information.

Below are the result which we have getting during testing on our board.

All result in hexadecimal.

Power LSB Value as per below one

Below are the result which we have getting during testing on our board.

All result in hexadecimal.