LMC6001 supply voltage
Hello,I use a LMC6001 to measure the current of a photodiode. I use an ADC to send the voltage to a MSP430. The ADC works with 5V supply. Can I use also the LMC6001 with a supply of +/-5v instead of...
View ArticleOPA1641 & THS4601 GBW for SVF
Hi,I have seen in one post about minimum GBW for a filter, right now I have an audio filter project base on state variable filter using LME49860 & OPA1641 or OPA827 with:F: 665Hz - 30475HzQ: 0.7 -...
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some questions about ultra low current measurement besded on OPA129
Hi everybody, Recently, I use OPA129 to design a I/V converter for a current as big as 10-100pA. But I found the Ibs of OPA129 is stable on 16 pA, which is very different with 100 fA on its datasheet....
View ArticleLMP7721 evaluation board J1 & J2 connectors
Hi Ti,Recently I purchased a LMP7721 evaluation board for one of the low current measurement application. (I want to measure the current generated by charged aerosol particles condensed on to an...
View ArticleMIC Preamp alternatives for INA163
I am working on a multichannel balanced audio input circuitry.The balanced audio input should be universal to allow greatest input level flexibility.It should support MIC input levels and standard...
View ArticleAFE032 Reference voltages
Hi,I am not getting the expected voltages of AVDD/4.7, AVDD/2 and PA_VS/2 on the DAC_NRF, TX_RX_NRF and PA_NRF pins respectively on the AFE032. I have performed the power-up, initialization and power...
View ArticleLMP7721 Evaluation board Transimpedance config.
Hi TI,This is a follow-up question from (http://e2e.ti.com/support/amplifiers/precision_amplifiers/f/14/p/328519/1145207.aspx#1145207) original post.I have another question regarding the LMP7721 eval....
View Articleopa129
hai i have designed a circuit using opa129. the circuit works as an electrometer to detect ions. the input to the circuit is of the order 1pA. I want to know how to measure the overall noise of...
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RTD Sensor with OPA2335 Problem
Hello there,I am using OPA2335 for signal conditioning RTD sensor. my schematic is attache here The Vcc=5V, Vref=2.5V, Iexc=1mAThe output from the first stage is around 109mV analog...
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A Query about servo integrators on the "Ref" pin of the INA333 and some other...
Hi,I was looking at a long chain of threads talking about how the reference voltage of the INA333 is set by a voltage divider followed by a buffer and an Integrator circuit.However, I really haven't...
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Water sense with AC Signal - Cutoff Design
We want to build an circuit of water cutoffControlling of water pump motor that adding\stop adding water to a containerThe water container maid of metal and the signal in the water should be AC Signal...
View Articleunder the power supply of +5V, can PGA309 output absolute 0 v? or only output...
on PGA309 zero offset:under the power supply of +5V, can PGA309 output absolute 0 v? or only output 60mV?
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OPA454 - Device Overheating
Hi Andrews,I am using OPA454 in non-inverting configuration powered by -5V and +90V supply as shown in fig of attached file. Value of power supplies and other components is also written in same. There...
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MPY 634 AM Modulator
Hi,I want to use MPY634 for AM modulation. I used basic multiplier connection mentioned in MPY634 datasheet.I have following issues:1) When I connect carrier signal on X1 I become on X1 an input...
View ArticlePh electrode and Reference electrode amplifier recommendation
I am using pH[16-705] and reference electrode[16-702] from Microelectrodes.I need recommendation on instrumental amplifier and voltage buffer amplifier.Amplifier requirements are:1) Amplifier...
View ArticlePGA281 power sequence
Hello I need your suggestion on power supply sequence on page 21 Figure 45, DVDD on first, then delay time with RC on VSOP and final 2-times delay time on VSP,VSN. On page 20, However, "DVDD must be...
View ArticleWhy is noise specified in root Hz
Why is noise specified in root Hz - nV/rootHzWhat is the significance of frequency?
View ArticleTHS4531A vocm low frequency noise
I require the THS4531A to have a low noise output at DC. The datasheet suggests using a 220nF capacitor on the Vocm pin to reduce noise.I tried a simulation in TINA using a unity gain configuration...
View ArticleBuffer amplifier for DAC8734EVM
Hi,I have a dac8734EVM I want to use to drive an elettro-optical modulator, but I got troubles with the load impedance matching. In fact, the modulator is matched at 50 ohm, but if I check the output...
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