Customer is looking for a low noise, low power AMP, which is used to amplify the mic signal in earbuds. OPA2333P can meet the power and noise requirement. Do we have a smaller packge AMP that has similar power and noise performance with OPA2333P?

Regards,

Nic

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LMV358: [FAQ] Better version of the LMV321, LMV358, LMV324

April 18, 2019, 12:58 pm

≫ Next: INA128: input is observed a negative overshoot voltage with long settling time if Vs-=-5V

≪ Previous: OPA2333P: OPA2333P smaller packge

Part Number:LMV358

Hi,

Are there any good (or better) replacement op amps for the LMV3xx devices (i.e. LMV321, LMV358, LMV324)?

I'm looking for a device that can stay within my budget and has extra features like EMI/RFI filters on the inputs, better voltage offset, and lower power .

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INA128: input is observed a negative overshoot voltage with long settling time if Vs-=-5V

April 18, 2019, 8:44 pm

≫ Next: TLV2471A-Q1: Sine wave oscillator

≪ Previous: LMV358: [FAQ] Better version of the LMV321, LMV358, LMV324

Part Number:INA128

Hi dear expert,

We met an issue when using INA128. Vs+=5V, Vs-=-5V, during the power supply ramps up, the input pin can be observed a negative voltage overshoot down to -1.7V and will ramp up very slowly to 0V, the ramp up time can last 2 seconds. Below snapshot is from input pin:

If we make Vs-=0V, the input pin will be not seen such a big negative voltage and the settling time is also shorter, around ~10ms. See below pic with VS-=0V.

The schematic is as below: INA128 is the middle device.

Our questions:

1. is this phenomenon is expected? and the input negative voltage is generated from INA128?

2. Is there any way to make the settling time shorter to xxms?

Thanks a lot for your reply.

Joyce

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TLV2471A-Q1: Sine wave oscillator

April 19, 2019, 12:09 am

≫ Next: LM2901: LM2901 output High level

≪ Previous: INA128: input is observed a negative overshoot voltage with long settling time if Vs-=-5V

Part Number:TLV2471A-Q1

We are designing a sine wave oscillator with single supply TLV2471 Amplifer. We are tested the circuit with Multisim simulation. It's not working. Kindly help us to solve the problem

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LM2901: LM2901 output High level

April 19, 2019, 2:44 am

≫ Next: About Comparator circuit using op amp

≪ Previous: TLV2471A-Q1: Sine wave oscillator

Part Number:LM2901

Hi Sir,

May I know the LM2901 output high level will be VCC or need external pull up on output side?

Please advice.

Thanks

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About Comparator circuit using op amp

April 19, 2019, 3:01 am

≫ Next: INA330: INA330 Current limits

≪ Previous: LM2901: LM2901 output High level

Hi,

Customer want to design comparator circuits using op amp.
The reason is the consolidation of parts.

Required specification is

・Absolute maximum rating voltage
: 36V (±18V)

・Comparator image that the customer wants to design
: NJM311/LM311

Could you tell me the recommended op amp for comparator design?

Best Regards,
Yusuke

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INA330: INA330 Current limits

April 19, 2019, 9:33 am

≫ Next: selection of best transimpedence amplifier

≪ Previous: About Comparator circuit using op amp

Part Number:INA330

Hello, I am using the INA330 for set-point temperature control application. I wanted to confirm a few aspects of my understanding of the datasheet.

Does the ±12.5uA maximum guaranteed current correspond to pin 7 (Io) or pin 8 (Vo)? This wasn't clear to me from the Current Conveyor - Current Output Range listed in the table on page 3 relative to the this statement on page 7: "The INA330 output (pin 8) is capable of swinging to within 10mV of the power-supply rails. It is able to achieve rail-to-rail output performance while sinking or sourcing 12.5μA." Similarly, is the Vo output current limit ±25mA (short circuit current)?

If the 12.5uA current limit does apply to the Io pin 7, I wanted to confirm that this inherently limits the Vo voltage swing based on the Rg value selected. The Vo swing would only guaranteed to be Rg*±12.5uA before Io becomes current-limited and the voltage won't scale linearly. So a 200k Rg gives a Vo=Vadj±2.5V, while a 5k Rg would give a Vo=Vadj±62.5mV. That voltage range could possibly be limited/saturated if the voltage swing extends too close to GND or V+ based on the Vadj set-point voltage. Is that all correct?

Thanks for your help.

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selection of best transimpedence amplifier

April 20, 2019, 12:00 am

≫ Next: OPA2890: Some further BP active filter testing the DABP topology

≪ Previous: INA330: INA330 Current limits

hello sir,

i am trying to design the receiver section for lider application

apd bias voltage is >240V

bandwidth 70-85Mhz

pulse with 10nsec

current range 20nA to 10uA

required output voltage is min 10mV

can you suggest best transimpedence op-amp for my application

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OPA2890: Some further BP active filter testing the DABP topology

April 20, 2019, 6:55 am

≫ Next: BOOSTXL-TLV8544PIR: Detection Range and Angle

≪ Previous: selection of best transimpedence amplifier

Part Number:OPA2890

Before I leave this newer (to me) BP filter topology, I stepped through a more demanding design targeting total 6dB gain with 1MHz center and only 50kHz BW forcing a 4th order solution in Filterpro. It does not support this topology, but using a MFB, it asks for > 1.5GHz GBP for the Q of 18 in each stage. That is too high a Q for MFB designs - and, while a mixture of computation and iterative R adjustments got the nominal design pretty close with the DABP approach, the response spreads are actually pretty high even using 1% C and 0.5% R. The implementaiton with a much slower (130MHz GBP) is pretty close nominally so it is possible to use a much slower device here than Filterpro suggests, but it would be interesting to test the shift to some GBP spread in the model - later.

(Please visit the site to view this file)

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BOOSTXL-TLV8544PIR: Detection Range and Angle

April 20, 2019, 4:34 pm

≫ Next: LMV7219: Comparator Hysteresis

≪ Previous: OPA2890: Some further BP active filter testing the DABP topology

Part Number:BOOSTXL-TLV8544PIR

Hello

We would like to purchase BOOSTXL-TLV8544PIR.

We are unable to find out the motion detection range (in m or mm) of this Booster and the motion detection angle (in degrees).

Would appreciate it if you provide us with a document stating this information.

Regards

Sam

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LMV7219: Comparator Hysteresis

April 21, 2019, 6:03 am

≫ Next: INA240: current sensing

≪ Previous: BOOSTXL-TLV8544PIR: Detection Range and Angle

Part Number:LMV7219

Hi Ti Community

This is a general question on any comparator with internal hysteresis although I am using LMV7219 in my design.

Assume a comparator has a built in internal hysteresis of X mV.

If an external feedback network is used to implement an additional hysteresis of say Y mV.

Then does the final comparator has a total hysteresis of (X+Y)mV.

Thanks

Diva

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INA240: current sensing

April 21, 2019, 6:47 am

≫ Next: DRV593: advantage over ADN8834

≪ Previous: LMV7219: Comparator Hysteresis

Part Number:INA240

Hello,

In the data sheet of INA240 we can see that is used for inline current sensing because it has PWM rejection. so my question is: if we want to use low side current sensing (not inline), is it better to use INA240 instead of INA190. is the PWM rejection feature in INA240 offer better performance even in low side current sensing?Is INA240 better than INA190 for a certain application?

Regards,

Mohammad.

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DRV593: advantage over ADN8834

April 21, 2019, 7:14 am

≫ Next: OPA548: OPA548F/500 thermal pad connection

≪ Previous: INA240: current sensing

Part Number:DRV593

Dear TI Experts,

I have a customer who is using ADN8834 now, can we use DRV593 to replace it? What's the advantage of DRV593?

Looking for your response~~Thank you~

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OPA548: OPA548F/500 thermal pad connection

April 21, 2019, 8:14 am

≫ Next: LMV321: LMV321IDCKR not rail-to-rail?

≪ Previous: DRV593: advantage over ADN8834

Part Number:OPA548

Hi team,

Our customer is using opa548 in their projects, power supply is +22V/-6V. For better thermal performance, they want to connect OPA548 thermal pad directly to heat sink. Since OPA548 thermal pad is connect to V-, customer wander do they still need to connect heat sink to V- using an independent PCB wire? Just like what we do in our OPA548 EVM. Does it OK to delete that PCB trace and use the OPA548 internal connection to get heat sink V- voltage potential?

If that PCB trace is needed, what does it used for?

They want to do that because they use Aluminum plate PCB, and they could only place wire on a single layer, and get limited wire to connect thermal pad to V-.

Could you help check about this?

Thanks,

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LMV321: LMV321IDCKR not rail-to-rail?

April 21, 2019, 11:49 am

≫ Next: INA219: Variation is large for current more than 300mA

≪ Previous: OPA548: OPA548F/500 thermal pad connection

Part Number:LMV321

Hi,

I'm using a LMV321IDCKR as unity amplifier and have the issue the op-amp seems to not work as rail-to-rail...The power supply is 3.1V. The positive input is connected to the power. The output is 2.4 - 2.56V and it fluctuates continuously. I tried a few op-amps from the same batch and they all behave like this. i also tried a LMV321AIDBVR (different pinout) in the same schematic and the output is steady 3.1V...

What is this, a wrong batch or i'm not understanding how rail-to-rail works? Please advice!

All parts ware bought in the US from a reputable official dealer.

Thanks!

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INA219: Variation is large for current more than 300mA

April 21, 2019, 3:40 pm

≫ Next: INA821: INA821 Small-Signal Response and Gain vs Frequency of G=2000

≪ Previous: LMV321: LMV321IDCKR not rail-to-rail?

Part Number:INA219

Hi TI Support Team,

We are using INA219 in our design.

Python Modules to talk to INA219 via FTDI chip
Max Current that can flow through : 3A
Shunt Resistor : 10mOhm

Calibration Procedure:

Using Electronic Load, applied the load at the INA219 and calibrated.
INA219 measured valued is cross checked with the Current Probe

The deviation is large. over 200mA when the load changes in real time. Kindly please advise how this can solved.

Thanks,

Satheesh

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INA821: INA821 Small-Signal Response and Gain vs Frequency of G=2000

April 21, 2019, 5:30 pm

≫ Next: TL972-Q1: input impedance

≪ Previous: INA219: Variation is large for current more than 300mA

Part Number:INA821

Hello team,

The customer is interested in INA821 because A single external resistor sets any gain from 1 to 10,000. He is considering G=2000 case, and he would like to know the performance of Small-Signal Response and Gain vs Frequency in case of of G=2000. The customer would be check with TINA-TI, but he would like to know the measurement data if possible before his evaluation. Would you please provide the performance data of G=2000?

Your help would be appreciated.

Best Regards,
Akihisa Tamazaki

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