AN-1798 LMP7721 Potentiostatic Circuit
Hello, I have built the Potentiostatic circuit in AN-1798: http://www.ti.com/lit/an/snoa514c/snoa514c.pdf I have chosen a value of 10 Ohms for R6. The only P-type JFET I could source was a 2N5462. I...
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TLC555 acuracy of Monostable Operation(One-shot)
Hello,I would like to now acuracy of Monostable Opearation by One-shot pulse.Pleas see the attached image file as schematics example. In this schematics "th" calculation is as below.th=1.1*Ra*C In...
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Making rf amp, 1-50MHz, 40-60dB.
Hi,I have to amplify a signal from order of nW to order of mW.I tried to make rf by followeing TI's example with THS3202. (file name: RF and IF amplifiers with op amps)I made the 40dB amp on prototype...
View ArticleLM2232 Failure
I'm using a LM2232 as a buffer to monitor 2 28vdc signals. The device has failed and with no input 1 channel has 1.5v on the output and the other channel has 0.13v.Both circuits consists on a 10:1...
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OPA365 in ADC Driver and DAC Buffer Configurations
Hello,I am designing a 4 channel ADC/DAC frontend which uses the following chipsADC: http://www.ti.com/product/ads8331DAC:...
View ArticleA question about the DA module in AFE031
I would like to know how the DA module of Chip AFE031 works.What kind of analog signal we can get from the end of the DA module,and what's the Conversion rules.for example, if I input an digital...
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OAP828 offset issue, quality problem?
Hello,I have a customer that's using the OPA828 at 1000x gain in an existing design and is seeing a discrete switching in the offset voltage by about 10uV (see attached image). The device is designed...
View Articleamplifier Load Regulation
Hi all, Now, i need a driver amplifier for the precision reference voltage output. in my meter,there are four 2.5mA load and max load is 10mA on the same phase, but the load is constantly changing...
View ArticleNegative Voltage on the Vin of the XTR111
Hi, I'm using an XTR111 as a voltage to current converter; but my signal input can be both positive and sometimes negative.So i put a 1N4148 diode to protect my input but when input voltage went beyond...
View ArticleOperating Temperature Range of INA197AIDBVT
As per the data sheet, it is provided that the operating temperature range is -55 to 150 and storage temp range is -65 to 150.But in the website, it is mentioned that operating temperature is -40 to...
View ArticleMOSFET
In a MOSFET, under channel pinched off condition(VDS=VGS-VT),the channel doesnt exists. Then what makes the current to flow through it and act as constant current source?
View ArticleInternal protection circuit of TLC082-Q1 and TLC084-Q1
Hello,One of my customer is trying to use TLC082-Q1 and TLC084-Q1 for ECU and they have to do examination about serge tolerance.Please answer following questions from customer. Q1:Please explain the...
View ArticleNEED INFORMATION- OPA2132PAG4
Hi Can you please provide the following information for the OPA2132PAG4 Part ?1. Junction Temperature Max (Tj Max) 2. Typical Power dissipation (Pd typ)3. Maximum Power dissipation (Pd max)4. Thermal...
View ArticleOpamps driving coaxial cables
Hello. I understand well that this might be inappropriate but I got lost a little and I need some help. I'm looking for an opamp with enough output current to drive a 5 meters long 50Om coaxial cable...
View ArticleOPA129 and LMC6001 offset voltage
HiI'm trying to amplify photo diode currents in the range of 0.1 to 50 nano amps. I used OPA129 and the suggested circuit in the datasheet and also LMC6001, although both have low input bias currents I...
View ArticleLMP7721 not working
Hello,This is my first time I am working with LMP7721. We both two chips. First we send for (machine) soldering (soldering was performed on SMD/DIP adapter). Then we connected the chip on breadboard...
View ArticleINA116 ECG acquisition
Hi,I am interesting to use TI product as well as I can because of very good documents and support.In my new project I want to acquisition ECG and may be EEG, but I want do it without digital part so I...
View ArticleMeasure sunlight
I know nothing about TI OP AMPS . I need to measure sunlight intensity. I have a photodiode (PDB-C 139) that has a typical output at 1000 lux of 67 ua, and at 120000 lux 8 ma; I will probably set the...
View ArticleISO5500 problem
Hello All,I have been using ISO5500 IGBT/MOSFET driver IC for one of my switching operation.(MOSFET used is IRFP4668)I have also used the same driver for H bidge circuit of same MOSFETs for current...
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LMP7721
hi,i want to measure a sine wave current which is in the range of pA and the frequency is between 0.1 mhz and 1khz using an LMP7721 ,here is the schematic ,will it work or should i add other...
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