Tool/software:
Hi team,
What is the "s" in the figure? It seems to be related to frequency. R1 and C1 form a low-pass filter. So how should "s" be selected? The specification seems not to introduce it.
Thanks
Xiaoxiang
Tool/software:
Hi,
I am designing a system to detect pulsed LASER light with a wavelength peaked at 1500 nm and a power level of 200 nW. I have attempted to design a transimpedance amplifier using various op-amps like LMH6629, but they fail to produce an output due to the very low power of the input signal.
Could anyone suggest a suitable IC, evaluation board, or module to effectively detect this signal?
Regards,
Tool/software:
Hi there!
When measuring the T_J sense output, according to the datasheet, the typical voltage value should be 1.06V at 25°C.
To calibrate the temperature measurement in our application, we have powered down the Amplifier (PD mode) and allowed it to reach an equilibrium temperature. Nearby to the Amplifier we have measured the PCB temperature remotely and have assumed that the amplifier will have the same temperature. This was measured to be 32°C, at which the amplifier temperature reading was 1.029V. Using the slope of 3.2mV/°C, we calculate that at 25°C, the voltage should be more like 1.006V.
Is this a suitable way to correctly calibrate the temperature reading?
Once powering the amplifiers (out of PD mode), the voltage reading is typically around 1.09V. This correlates to 50°C when using our calibrated curve, but only 33°C when using the 'typical value' curve.
Note that the data sheet contains a Voltage verses Temperature curve (Figure 8-41) and this line passes through the point (25°C, 1.0V) not (25°C, 1.06V).
Given that the difference in temperature is quite large, I would just like to make sure that we are interoperating the data correctly.
Thanks in advance,
Jesse
Tool/software:
In AMC1350 applications, INN is connected to ground. If my input is a differential signal, like this,
can AMC1350 still be used? If not, are there any other isolated chips that can be recommended
Tool/software:
Hey, I want to use the XTR117 to convert a 0-10V signal to a 4-20mA signal.
On my board, I have an Analog Voltage Output that provides a 0-10V signal, and on the same board, I have an Analog Current Input circuit that reads a 4-20mA current in a two-wire 4-20mA current loop configuration.
I am designing a testing jig where I can loop the Analog Voltage Output port to the Analog Current Input port, for which I require a converter circuit that I can attach in between.
How should I connect these, and what should be the value of RIN?
With Reference to this image. 
Tool/software:
Hi Team,
Do we have integrated input filter amplifier? Or do we have filter IC? Customer would like to use it to sensing voltage and achieve high accuracy.
BRs,
Francis
Tool/software:
Hii,
we are using INA239 for our project, following are the specs.
Current Measure : 450A
Rshunt : 100uOhm
following are some queries
1. If we are not using VBUS pin ,can it be left floating
2. The INA239 freezes if we measure current more than 50A
3. The shunt is busbar type ,the distance betwwen INA239 and shunt is more than 20cm how can mitigate the effect of harness drop,will extra filter helpful
4. we are powering INA239 using 3.3V is that effect the IC performance
Regards
Mudit Mittal
Tool/software:
Hi Bu team,
Hope you are doing well !
In the customer's current application, the IN pin needs to be connected to a positive voltage APD, that is, VBIAS is a positive voltage.
Is this suitable for this application? Is there anything to pay attention to? For example, how to use IDC EN?
Tool/software:
Hi,
I have connected A0 and A1 to VCC and communicating to read Die ID using 0x45. I am able to correctly read the Die ID man ID. I am also able to read bus voltage. But when i read configuration register, it is always giving me 0x0000 instead of default 0x4127.
Similarly, if I am setting the configuration register myself to 0x4127 even then its giving 0x0000 on readback. I dont get any error on i2c communication. Communication is not an issue otherwise i would not be able to read IDs and bus voltage anyway.
Has anyone faced similar problem? Can anyone please guide me in this regard?
I have tried communicating at 100KHz and 400KHz both. I am using STM32L051 MCU.
Regards,
Junaid
Tool/software:
Hi,
We plan to use the INA745B in an industrial battery powered device and i have a question regarding input power draw on the high voltage side when the device is powered off.
Figure 6-6. High-Voltage Input Multiplexe shows a fixed voltage divider from Vbus to GND, Zbus is specified 1MOhm (in 5.5) under the condition "device enabled with active conversions".
If I understand 6-6 correctly, the impedance shouldn't get lower than 1MOhm if the digital supply is off but I couldn't find any specific information in the datasheet.
Is there an estimated Zbus for this situation? Can we assume that the impedance does not drop below 1M?
Thank you,
Lukas
Tool/software:
Dear e2e Support,
In order to comply to my customer industrialisation constraints, we are wondering if a 0.25mm is acceptable, vs the 0.18mm recommended; at least for the Alert, EN, A0 and A1 pins which require via-in-pads.
Is there any risk to avoid?
Regards,
Tool/software:
Hello, I'm looking to source/design an isolation amplifier solution that will measure millivolt or lower level signals on a power bus (basically trying to measure series resistance of a portion of the bus via a voltage measurement). The bus is nominally at 10V or lower, but can rise to higher voltages in the event of a fault. Our minimum operating requirement is 5kV, but if these could be sized to reliably see 10kV for several seconds+ that would be the goal (of course still measuring small signals at these high common modes). Still digging through instrumentation but I just wanted to confirm with the applications team that I'm in the right ballpark when it comes to isolation amplifier series, and see if there are critical application notes that I should take a look at first. Thanks!
Tool/software:
Hello TI Team
I hope you are doing great,
Could you please confirm if TI parts LM358DR& LM358MX/NOPB are actually the same?
I understand that LM358MX/NOPB belongs to old National Semiconductors nomenclature, and LM358DR belongs to traditional TI nomenclature.
Are they using the same manufacturing process?
Thanks in advance.
Kind Regards
Tool/software:
Hello guys,
One of my customers uses OPA2251 for their current products.
At this moment, they have the following question.
Q.
We need any graph which shows PSRR characteristics of OPA2251.
Do you have the following graph?
1. Power supply voltage vs PSRR
2. Frequency vs PSRR
Your reply would be much appreciated.
Best regards,
Kazuya.
Tool/software:
The S-Parameter Models provided for the TRF1208 include the 3-port SBOMBZ7A.ZIP and the 4-port SBOMCG2.ZIP. How should I use them?
For a circuit with single-ended input and differential output, should I use the 3-port model?
Or should I use the 4-port model and terminate one side of the input like in the actual circuit?
Tool/software:
Circuit diagram:
Output without input signal:
Output with 30MHz burst input signal:
How to resolve this problem?
Tool/software:
Hi team,
My customers are using LM2903BQDRQ1 in an use case with above input voltage range, I have read this AN Application Design Guidelines for LM339, LM393, TL331 Family Comparators Including the New B-versions (Rev. E) and need to double confirm with you about my understandings:
Customers use case: LM2903BQDRQ1 (not confirmed if pre or post PCN version) Vcc=5V, one of the input voltage range is 3.8V/4.2V as threshold of comparator, another input is changing from 0V to 4.8V. In this case, there is some time that both input will above the Vcc-2V range mentioned in datasheet. So according to the AN, pls help check my understanding and the questions below:
1. If the second input is below Vcc-2V=3V, then LM2903B-Q1 can work normally but with a longer latency?
2. If the second input is from 3V to 4.8V, then LM2903B-Q1, the outputs will follow the table 3-1 in application note (high for pre PCN device and low for post PCN device)? In this case will the comparator outputs not be triggered to change when the second input is passing the threshold set by first input (3.8V/4.2V), am I understanding this correctly?
3. This problem was found by customers because they added input capacitors two both inputs of one channel comparator, before that even with the above inputs the comparator worked normally. Could you also help on explaining that why it can still work normally without input capacitors? What could input capacitors impact in this case?
BR,
Manu
Tool/software:
Hello,
I have successive failures of small test boards that I made with the THS4551. The failure mode is that the VOCM, which is at mid supply by my design, is at 0V, clipping the output signal. Another failure mode is very reduced gain or no gain. My inputs are AC-coupled from the previous stage.
This occurred on my setup with three different boards.
I would just like to know if there's anything known that pertains to what I've described.
Thanks,
Wilson
Tool/software:
図に示す回路で電流を変換すると、グラフにステップが発生しました。
この現象は、このICの設計から想定されていたものなのでしょうか?
段差を減らしたり、なくす方法があれば教えてください。
Tool/software:
Hello ,
Can you please provide me PCB dimension of AMC1311EVM board, i want to use in my test equipment to measure the current.
Thanks
Shobhit
