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INA149 PSRR
Hi there,let's go deep into INA149 :-)There is defined PSRR (power supply rejection ratio) in the datasheet as 120 dB. Then we can see POSITIVE PSRR vs FREQUENCY graph at page 8.Plots in figure 16 and...
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INA149 grounding
Hi there,look at my design. (Note I use INA149, but have schematics with AD629 as a placeholder; don't be confused :-)What's my concern?Does INA149 works correctly with inputs floating as you see in my...
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Problem with INA826 and OPA333
Hi all,We intend to use INA826 and OPA333 for our design.Goal: Convert input voltage from sensor (0V - 5V) to voltage for ADC (0V - 3.3V). I use the TINA-TI tool to simulate the circuit:The .TSC file:...
View ArticleVFC110 internal resistance
I'm disty of Japan.I have some questions on VFC110.****** Background ***************My customer is evaluating VFC110 with the evaluation board which he designed.He intend to change "fFS = 4MHz or 2MHz"...
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current loop with fast chaning dynamic load
Hi Team,I would like to ask if a current loop can drive a fast changing dynamic load. The load is switching from OPEN to a 2.5V LED in 300KHz frequency. Do you think if the current loop can work well?...
View ArticleThis question involves the possibility of the transistors in a LMV774 Op-Amp...
To whomever reviews this post,I had a question in regards to TI's LMV774 series op-amp. I cannot provide schematics, subsystems, etc because all of this information is disclosed. I am trying to...
View ArticleXTR111 clarification of datasheet
I have the following questions related to the XTR111 datasheet. The intent of clarifying these questions is to document the expected accuracy of a system, which uses the XTR111 as a part of that...
View Articletolerance of internal thin-film resistor
Hello,XTR110 data sheet P.8 says 20% of internal thin-film resistors have a absolute value tolerance.Will this be a value including dispersion and the temperature properties of the devices?And whether...
View ArticlePower Supply Range for OPA27GU Precision Op-amp
OPA27GU was designed as an integrator in the phase locked loop system to drive the VCO.The current design is using +28V for Vcc and 0V Vee to ground. The datasheet is stating +/-22V for the absolute...
View ArticleRecommended circuit for Holter monitor (ECG)
I'm working on a Holter monitor (ECG data acquisition) which I need to create for my school project. I'm still in the begging phase, so I didn't choose measuring circuit design yet, but I've...
View ArticleQuestion on PGA281 datasheet
Hello,I am looking to PGA281 datasheet.In there, I cannot understand Figure 38.If 8Vpp applied to the input, each VOP, VON will show 2Vpp. (I agree)but, why differential VOUT will be 4Vpp? ( I cannot...
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PGA 309 EVM support
Just received a PGA309EVM-USB.It will not load "Model File Emulator File" as claimed in the User Guide. It only keeps the default "4wire_4p096_diode.txt" even though there are many other selections...
View ArticleOPA548 overheating with 1.75A load
We are using OPA548(TO-220,Staggerd lead type) for driving load upto 2-3A. As per data sheet, OPA548 can sink and source current upto 5A to the load .We are sourcing current upto 1.75A to the load of...
View ArticlePico to micro amp DDC
Hi!Maybe you guys can help me out on this. I have a 10pA to 10uA current that I would like to digitally read out from a large photodiode. The capacitance of the diode is a massive 10nF.I was thinking...
View ArticleProblem on XTR117 directly driven by current source
Hi, I am making 4-20mA circuit. output stage is xtr117 driven by 40uA zero + 0-160uA(current output from OP).. I found that it takes too much time(10 minutes or more) to back to stable 4mA...
View ArticleTLC2272AIDR' ESD Spec
Hi. Tiers.I can't find out ESD Spec in TLC2272AIDR's datasheet.What is the ESD Spec of TLC2272AIDR?Please let me know ASAP. Thanks.
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INA326 and 100mV reference voltage (using LM111)
Hi Pete el al,In this topic: We are using the INA326 device, to convert range (0V-5V) to (0V-3.3V). And in this version, we decided to ignore the non-linear region of output INA326.And for preparing...
View ArticleCurrent sensor, 5 MHz -3dB bandwidth, 800V input Common Mode Voltage
Hello,Does TI have a current sensor (or current sense op amp) with 5MHz -3dB bandwidth and 800V input Common Mode Voltage? I am trying to sense triangular shaped current at 500kHz (which has...
View ArticleMeasuring 2.5uA threshold current
Hi,I would like to detect threhold current of 2.5uA, so i require a current shunt that has low input current. Is there any current shunt with voltage out put i can use? Also, due to mechanical...
View ArticleXTR300 sinking current source
Dear Sir,it is said XTR300 can work as +/-20mA current source, i can't find reference schematic for sinking current source from data sheet. Can you pls supply one for me?thanks in advance. regardsHawk...
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