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TL331: TL331 Precision
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OPA847: the feedback capacitor value of TIA
Part Number:OPA847
Hi, TI team,
I have study some datasheet of op amp, such as OPA847, OPA843, TLV3541, which are configured as a trans-impedance amplifier for amplifying the light-dependent current of a photo-diode. In these datasheet, the values of feedback capacitor are calculated by formula 1. The source of equation (1) is not described in the datasheet. I would like to know the derivation process of equation (1) or the relevant data files. Can you share it with me?
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LM324: How to design filter to filter 450Hz/25KHz@-40dB?
Part Number:LM324
Hi Sir
Our signal as attached file, Vcc = 5V,We want to filter 450Hz/25KHz@-40dB, and our center freq=60Hz.
May you have suggestion how to design(Please visit the site to view this file)?
Bogey
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LOG114: Curent below 100nA cannot be measured
Part Number:LOG114
Hi,
I am using LOG114 for Insulation resistance measruement. Current measruement requires 500pA to 5mA DC.
I tried with LOG114 but current below 100nA is not possible to measure.
The circuit is as below. The 2.2V input is a stable source without noise. Also the 5V supply is stable and derived from battery.
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AMC1301-Q1: amc1301
Part Number:AMC1301-Q1
Hello,
Good evening
In AMC1301,it uses delta sigma modulator which converts analog signal to digital bit stream,and how it is converted back to analog signal which is fed to OPA320-Q1?
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THS4520: What is the VOCM pin input voltage range of the THS4520?
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TINA/Spice/THS4521: New TINA model.
Part Number:THS4521
Tool/software:TINA-TI or Spice Models
Hi team.
I simulated using the model from TI website , but the result waveform was terrible.
I read this E2E(https://e2e.ti.com/support/amplifiers/f/14/p/663005/2440096?tisearch=e2e-sitesearch&keymatch=ths4521%20model#2440096).
If you fixed the model from TI web, could you share new TINA model ?
If you have not yet it, can I substitute [THS4551] ?
Sincerely.
Kengo.
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OPA4344: Thermal Resistance
Part Number:OPA4344
The Rtheta JA is provided in the datasheet but the Theta_JC is not provided. Please provide Rtheta JC for the OPA4344EA TSSOP14 package
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INA240: Calculate the Vref error in midsupply divder circuit
Part Number:INA240
I would like to use INA240 in circuit shown below, here the REF1/2 are connected to split the
power supply by half. See tab2, page 19, Vos_ref; what value of Vref shall I put into equation?
Vref seems to be nominal Vs/2 but I can guess REF2/1 resistor aren’t equal.
How such a connection affects error budget?
Can Ti Support briefly explain and share the definitions of Reference divider accuracy, and RVRR?
In my situation Vref1=gnd/Vref2=Vs. I got roughly Half supply. Does it mean that Vos is near zero?
Shall I put Vos ref as :
Vosref = RVRR x [ Vs/2 - Vs/2*(1+0.1%)]
What is the Vref in the equation - ? (see drawing below)
Can I use 0.1% reference divider accuracy to calculate the Vos_ref?
As You know we don’t use differential ADC, so the divider accuracy will put some offset to the INA240 internal connections.
The example from datasheet are not similiar to mine. The don’ use internal Ref divider.
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LMC6492: Thermal Resistance
Part Number:LMC6492
Please provide the thermal resistance Rtheta_JC for the LMC6492BEMX. The Rheta JA is provided in the datasheet but not the Rtheta JC
The question was already asked / provided here:
https://e2e.ti.com/support/amplifiers/f/14/t/795907
But the answer was not posted in the forum - please reply within the e2e forum so this will be searchable in the future.
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XTR110: Offset adjustment
Part Number:XTR110
Dear Technical Support Team,
My configuration of XTR110KU is following.
Vin: 0V～10V
Iout: 0mA～20mA
I adjust the offset pin(Volume register).Then almost device show 0mA(target is under 4.8μA) when Vin=0V after adjusting register(VR) of offset adjust pin(OK device).
However some device doesn't shows under 4.8μA in spite of adjusting offset pin(VR). It shows 5.6μA or 7.6μA or 8.0μA(NG device).
When replace the other device, it behave OK. It seems Individual difference of device.
I attached my schematic. Why is there difference between OK and NG?
(Please visit the site to view this file)
Best Regards,
ttd
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LM7372: looking for a part that has faster settling
Part Number:LM7372
Currently I'm using LM7372 in a design but the settling time is only specified to 0.1% for a 10V step, also noise is higher than I'd ideally like. Does TI have a suitable replacement for this part that has settling to 0.01% step in less than 70nS specified ? Also preferably with noise down in the 1 - 3 nV/RtHz region. I know ADI make such a part but wondered if TI had anything newer that would be worth evaluating ?
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OPA541: Current Sense Pin
Part Number:OPA541
My application does not use the current limit of the device and therefore I would like to know if I am to leave the current sense pin open or tie directly to the output with no Rcl in between or something else. Please confirm and provide the reason for the methodology.
Thank you,
HSG
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LMP7721: LMP7721 rails to V+ when a Piezo crystal is connected
Part Number:LMP7721
Hi,
The LMP7721 eval kit is set to a gain of 33, V+ is 2.5V and V- is -2.5V. Vref is ground. Non-inverting default mode. When a 1mV square signal is connected from a signal generator, I get the required output gain. But when I connect a Piezo crystal the Output is railed to +2.5V. Only when I excite the crystal which should produce a good enough signal, I see some small negative bumps in the oscilloscope. Please let me know what changes are required to get the amplifier working for a Piezo crystal.
Regards
Manju
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TINA/Spice/OPA1678: If OPA1678 can generator waveform like mirror function?
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TLV9001: PIN 1 indicator for X2SON-5 package
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INA240: Idea or techniques to use INA240 in higher common mode condition
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INA126: Too low gain
Part Number:INA126
Dear Sir or Madam
I experience measurement errors occasionally, where it seems that the gain is too low. It helps to change INA126, but since there are 2 almost identical cycles and it is always the same that has the problem, I suspect there is something on the edge of the INA126 work area.
The only difference between the two circuits is the resistance from IN- (pin 2) to REF (pin 5). In the "good" circuit the resistor is 5k1Ohm and in the second it is approx. 10 times larger.
The input resistance of IN + is approx. 52k Ohm, RG is 1M Ohm, RL is 24k Ohm.
The circuits are used to measure on a PT100 sensor.
I have measured the gain to about 4.6 and it should be 5.08.
It is not always the fault that shows right away, so it may take several days for it to show up, which makes it more difficult to find.
Hopefully someone in here can point me in the right direction for my investigation.
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BOOSTXL-TLV8544PIR: BOOSTXL-TLV8544PIR firmware communication protocol
Part Number:BOOSTXL-TLV8544PIR
Hi Experts,
My customer want to know BOOSTXL-TLV8544PIR firmware protocol communicating with pc GUI or source code, which can help them develop PIR application based on our other MCU device such as MSP430. Could you please share this protocol to us.
Thanks
Regards.
Alex.
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INA333: input failures: on INA333 AIDGKT
Part Number:INA333
I have seen several failuren on our pressuremeasurement boards, resulting in an - almost short on the positive input terminal.
We are using a Wheatstone bridge as input with an impedance of 1.5kohm. the supply is configured as a single supply +5V.
according to the "normal" datasheet the input should be able to withstand an overvoltage if the current is held under 10mA.
teh input has a higher input voltage fx. at startup the bridge will limit the current to 3mA -so no problem!!
when i look at Ti homepage: the input at INA333AIDGKT is only able to withstand a overvoltage at +- 0.1V but at the datasheet it is +- 0.3V
Is it possible that the INA333 AIDGKT has a different input protection circuit?
bg. Benjamin
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