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LM331AN voltage to frequency conversion problems
Hi,I am trying to use the LM331AN for both V-F and F-V conversion. I am using the circuit in figure 15 of the datasheet (inserted below) , with the following changes: Rs = ~8.4k, Rt = 20k. I am running...
View ArticleIVC102 integration time 1us
Dear community,I use IVC102 that is powered with +/-15V in order to measure low currents.Internal capacitors are all connected together and at pin 3. So total capacitance is 100pF.pin 2 is input,pin1...
View ArticleCurrent noise of the OPA637 op-amp
Hi, We have a preamplifier design using the OPA637AU and are experiencing high noise levels (~30nV/rtHz, rti) apparently due to current noise. The input source presents approximately 330pF//10M Ohms...
View ArticleLow power latched comparators
Hello,I'm working on a mixed signal application where low power consumption is crucial. A significant portion of the power consumption is now taken by a comparator in the circuit (LMV7291), even though...
View ArticleINA128 bandwidth
Hi there,I am currently testing the INA128 and I am a little bit surprised because above 50Khz a sinewave input signal is turned into a triangular one. In other words my input signal is distorted. Is...
View ArticlePicoamp Precision Amplifier
Hello, I need to measure currents in the order of 0.05 pico amp. I would like to know which opamp can you recommend ?Signal Bandwitdth is below 10 Hz.The circuit is a potensiostatic circuit for...
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buf16821 : technical question? 12V DAC output ?
HiCan I ask about buf16821?Applicaiton is for LCM equipment of Gamma control inspection.question as below :afer that initial Vdd 5V Input,while insert Analog Vcc 12V ,as you can see the waveform,Init...
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Ultrasonic receiving circuit of LF356 exists a moving DC offset
Recently, I am debugging an ultrasonic receiving circuit as shown in Figure 1.Due to the high impedance of the ultrasonic sensor, a JFET op-amp LF356 is used to convert the high impedance to low...
View ArticleAMC1100
Hello everyoneI need to connect standard computer Audio out via Isolated Amplifier. I thought to use the AMC1100. However this device is a differential style and the computer output is single ended....
View ArticleInquiry regarding output voltage range on OPA2277UA
Hello, allNow we have one inquiry regarding output voltage range on OPA2277UA from our customer.They are using this device on following conditions.V+(8pin) = +12V, V-(4pin) = -12V applied.Input voltage...
View Article2 Lead dry electrode ECG circuit
Hello TI,I need a circuit design for a 2 Lead Dry contact electrode ECG system. I am selecting INAMP & OPAMP for the design. Please suggest me a very good working circuit & IC'S. Please I am...
View ArticleOp Amp TLE2141
Hi all. I am having problem with Op Amp TLE2141. When I used Op Amp TLE2141, the output voltage produce is too low which is in 32mv. I gave the Vcc=+-18volt. I want to increase voltage until 4 volt. Do...
View ArticleOPA1S2384 / OPA1S2385 Data sheet lacking
I have two questions about the OPA1S2385 which did not appear to be answered in the data sheet. 1) what are the electrical characteristics of the buffer section (op amp B) or does it have the same...
View ArticleTLC555C source current
I am setting up TLC555C to operate in astable mode, with power supply voltage to be 3V. I measured that the source current to be 3.6mA. The output is connected to an led with a 50ohm current limiting...
View ArticleHART_LOOPBACK
I am using EVB HART MODEM QFN and facing the issue of loopback after connecting it to UART.Is there any solution to this?? At present I am using single modem and getting the correct wave forms for...
View ArticleLOGARITHMIC AMPLIFIER
Hi,I am an doing a project that has an RF Power meter as one of the main functional blocks. From my literature review, the main component used is an AD8307 logarithmic amplifier. However, this IC is...
View ArticleINA116 replacement or High temperature range.
Hi,I am using INA116 ultra low input bias current instrumentation amplifier in one of my application to measure pH value. INA116 operating temperature range is -40 to +85°C.I would like to know is TI...
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LM331 Frequency to Voltage Conveter Problem
Hello,I have one question under the following conditions.The output voltage was saturated at 3.8V when Fin change from 4.8kHz to more than 6.2kHz.Could you tell me any solutions?Best Regards,Hidetoshi...
View Article50Hz hum in photodiode amplifier
Hello,I have a photodiode transimpedance amplifier made of a Hamamatsu S1226 photodiode and a IVC102 Burr-Brown integrating transimpedance amplifier. The amplifier is run in a reset-and-integrate mode...
View ArticleChoosing a transimpedance amplifier to replace OPA111
Hi TI Engineers,I obtained a reference design of a transimpedance amplifier that uses two amplification stages to achieve the following:Input range below pA to nAGain of 10^8 - 10^10 (V/A)Max bandwidth...
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