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CTE data of TLV2374QDRG4Q1.

March 9, 2015, 6:51 pm
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Dear Sirs.

Could you supply to CTE data of TLV2374QDRG4Q1?

CTE means Coefficient of Thermal Expansion. GM has requested to our customer as following.

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Are there any parts with large CTE differences from the PCB substrate? What are the largest CTE mismatches for each size (package type) of part on the PCB? What is the maximum linear CTE mismatch over temperature for each package type? Are any greater than 9um - 12um? If I know the PCB laminate CTE (Coefficient of Thermal Expansion) in the X/Y axis as well as the CTE of any of the larger parts on the PCB, I can calculate the risk of any CTE mis-match. Please provide laminate CTE and part's CTE.

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Please advise me

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LHM6882 output to single ended

March 10, 2015, 9:19 am
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Im developing a general Function Generator. It has a High speed DAC3484 that gives differential output. I give this output to LMH6882 which has a programmable gain.. Now i want the output of LMH6882 to be given to a SMA connector. How do I convert diff ouput to single ended output for SMA.

PS. I dont want to use filter since i want wideband fucntion generator.

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LMP91000 / CC2541 Gas sensor / Bluetooth Platform for Oxygen

March 11, 2015, 12:07 pm
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We are attempting to use the TI gas sensor / Bluetooth platform to monitor a chemical oxygen sensor.  The hardware and ios app come set up for a CO sensor, reading in ppm on the Apple device.  We have a CC Debugger and would like to change the hardware and app to read from an oxygen sensor in percent O2.  We have seen the references to WEBENCH, Smart RF Flash Programmer and IAR Workbench.  Accomplishing the change is not obvious.  What steps do we need to go through to get the firmware changed over to the O2 sensor and will the app then recognize the sensor as NOT a CO sensor?  We have installed the 0 ohm R43 and have a different O2 sensor with 220ua in ambient air (like the CityTech 40x-1).  Any help would be greatly appreciated.

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Pulling single supply OPA725 output to 0v with a negative supply and resistor

March 12, 2015, 5:01 am
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Hello all, can you use a negative supply and resistor to pull the output of a OPA725 to 0v, when the part has a +12V supply?  I am referring to the same circuit as shown in figure 2 on page 8 of the OPA334 data sheet.  I would use the OPA334 but this circuit must operate off a +12V supply. 

If the OPA725 won't do this function, please recommend an op amp that will (one that can be made to go to 0v output but has a +12V supply).


Thanks for all responses.

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Input impedance of AMC1200

March 12, 2015, 9:11 am
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Hello,

What is the input impedance variation in function of the temperature ? 
It is important for me because my signal source does not have a very low output impedance and the temperature range is wide.

Best regards,

Marc

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LM7321 in SnPb - or another amp like it

March 12, 2015, 1:42 pm
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Hey,

I need the LM7321 in SnPb.  Since I know this part is only offered in NOPB, could someone suggest me an SnPb amp that is as similar as possible?

Thanks,

David

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Rrail to rail opamp / 0-5V / buffer required

March 14, 2015, 3:29 am
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1. I need rail-to-rail opamp, 0-5V to be used as buffer output of DAC8568.

2. Current drive strength I need is +10ma. But this is bit flexible.

3. Primary condition is it should not degrade te performance of dac 16 bit output.

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OPA4188 for myoeletric processing

March 15, 2015, 6:08 pm
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Hi

I was wondering if the OPA4188 would give a good performance for a signal processing. Im doing a band pass filtering, from 5Hz to 520Hz and was thinking on using that opamp... is a good choice??

best regards

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REF102

March 16, 2015, 6:24 am
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Hi,

I would like to know how to select the TRIM external resistors to get 9.9V at the output.

Thanks

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Interfacing LMP91051 with other sensors than thermophiles

March 16, 2015, 3:29 pm
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It is possible to use the LMP91051 with other kind of sensors than thermophiles?
For evaluating system capabilities and for comparisons it would be great having the opportunity to connect

1. Pyroelectric Detectors
2. Photodiodes (like PD48-03-PR)

It is possible to use an interface circuit before connecting to LMP91051 input?

In the case of the pyroelectric sensor it could be an impedance converter, but which one is suitable?

And which kind of circuit is needed for the Photodiode ?

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output current sourcing / sinking capability of TLV3501 comparator

March 16, 2015, 10:50 pm
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Hello,

I am unable to find the output current sourcing and sinking capability of TLV3501 comparator in its datasheet.  Can someone help?

Regards,

Nitish

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OPA549 single supplied?

March 17, 2015, 12:08 am
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Hi,

I'd like to design simple power supply with OPA549as a power source  but the goal is to use single power supply (30V, 5A) for the opamp. What is the minimum output voltage with the OPA549 supplied this way? The datasheet gives the range from 1V...but would be possible to have the range started from 0V? I would use simple charge pump to obtain negative rail (for example -5V) in order to have the range from 0V  but this way the negative rail would have small maximum output current. Why I want to use this solution? Because I have the power transformer with one output voltage. Could you give me some tips? Best regards... Robert

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Alternate for ISO120SG

March 17, 2015, 2:10 am
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Greetings,

Please suggest the FFF alternate for TI part number "ISO120SG", which is currently in NRND.

Your quick reply in this regard will be highly appreciated.

Thanks,

Siby

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Question about OPA549

March 18, 2015, 2:40 am
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Please let me know about two point below of OPA549.

※±24V,5A_max

・Is OPA549 have the input timing?

　Which is necessary to input first, VIN+/Vin- or V+/V-?

　Or,isn't it necessary?

　(If V+/V- input first, doesn't OPA549 take a stress for a load?)

・Should Ref-pin connect V-?

　Or, Ref-pin connect to GND, no ploblem?

 

Best regards,

Satoshi

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OPA2188AIDT noisy

March 18, 2015, 6:24 am
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Dear Forum,

We are using the OPA2188AIDR into an application.

We measure the gage displacement when we drive a piezo.

The system is in close loop, and some time we have some spikes after the error amplifier.

The OPA2188 is used to construct and amplify the gage signal. We suspect the following circuit OPA2188,

if we touch the device with a finger, it will be very sensitive.

If we place a mini "shield" with a copper foil connected to earth top of the body of the circuit,

we minimize noise and spikes due to esd.

Is this how to configure the circuit is normal?, or so we have another problem relating to it?.

How to reduce spikes or ESD? problem. Have we to add extra components around the OPA. 

Thank you for your valuable information.


Best regards.

Frédéric S

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LMP91000 I2C Interface and Control

March 18, 2015, 7:29 am
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I have used one LMP91000 in circuit and tied the MENB pin to ground. But, when I am doing some measurements I find a high noise level which I suspect is due to some digital clock circuit no matter there is no clock signal provided on the SCL pin. .

It is mentioned in the dataseheet that when just one LMP91000 is present on the I2C bus the MENB can be tied to ground (low logic level). But, by doing so aren't we keeping the I2C Interface always active which can consume power and keep the I2C Interface analog modules active which can introduce some noise? Can you please describe the decoder circuit used in the I2C module interface?

 

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INA122 thermocuple amplifer non linear gain Problem

March 18, 2015, 10:38 pm
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Hello,

I am designing a Thermocouple amplifier for a T type thermocouple in the range of 0 to 150 deg C.

Voltage range of input is:-0.000 to 6.704 mV

Adc range is 0 to 3.3 V

So i have used a INA122 for 500 gain.

Simulation in TINA gives correct response till 4mV. Above 4m gain is not linear.

How do i solve this problem?

Do i choose a different in Amp?

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OPA2364 - diode clamp

March 19, 2015, 12:31 am
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Hi all,

Would you mind if we confirm about OPA2364?

The datasheet indicates inputs as the following;
"Input terminals are diode-clamped to the power-supply rails. Input signals that can swing more than 0.5V beyond the supply rails should
be current limited to 10mA or less."

We got that Input terminals are diode-clamped to the power-supply.
So, are Input terminals diode clamped to the GND also?
We would like to know exactly whether this device has OVP about Input terminals or not.

Kind regards,

Hirotaka Matsumoto

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Voltage monitor

March 22, 2015, 7:18 am
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Hi,

Need to Monitor the Input voltage, which Comes from two 12V Pb accus. So, Minimum is expected at 21.6V and max at 28.8V. My ADC has an Input range og 0-2.5V.

To get the interesting range with max. Resolution, I want to map ~21V to 0V out and 30V to 2.5V.

Here my solution, but maybe there is a smarter way to do this.

Thanks for helping.

I also used the measured value together with the measured current to calculate the used energy.

With best regrads

Gerhard

(Please visit the site to view this file)

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LM2904 questions

March 22, 2015, 8:15 pm
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pls see following schematic:

    customer use LM2904 in negative power supply, and V+ is GND, and V- is -10V, and they found when ref voltage on Pin3(in+) great than -1.1V, then output PIn1

haven't output, so they provide -1.2V on Pin3, the output is ok at room temperature,  but when test it in lower temperature(-20degree), the output is incorrect, pls help to fix it.

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