Part Number:OPA2277

This is Joong-hyeok Lee, DMSMS researcher of Leoinnovision.
Leoinnovision is the official EOL(End Of-Life)/obsolescence part manager of Korean Military (Army, Navy, Air force) and PLM agency of many defense industries (Hanwha, ADD, etc.)
Especially, your product has been used in developing TACM(Torpedo Acoustic Counter Measure) detecting equipment manufactured by LIG NEX1.
On behalf of Korean DoD(Defense Of Department), we are checking EOL/status information on the parts of system. At the next year, the TACM equipment will be going to operate. Accordingly, Korean DoD hopes to know the information related with product EOL(End Of-Life) to sustain equipment operation.

Part Number: OPA2277UA
Part Application: TACM, Electrical Cabinet(Signal Processing), Receiver, DC Power, CCA(Filter)

In case of part obsolescence, our military and Korean DoD hopes to know the information related with product EOL(End Of-Life).
So could you provide me some information of the item?
I need the data below.

1. Start of Production(Release date/Start of selling Point) : YYYY-MM
2. Discontinued or Not : Y or N
3. End of Production/Expected EOL Point : YYYY-MM(If it was discontinued/will be discontinued or have plan to discontinue)
4. End of Sales : YYYY-MM(If it will be discontinued or have plan to sell)

If the item has not any discontinuance schedule, please let me know.
Korean DoD will use the information above only for the research and the next purchase.

Feel free to contact me if you have any further information of me and my company.

Part Number:OPA827

This is Joong-hyeok Lee, DMSMS researcher of Leoinnovision.
Leoinnovision is the official EOL(End Of-Life)/obsolescence part manager of Korean Military (Army, Navy, Air force) and PLM agency of many defense industries (Hanwha, ADD, etc.)
Especially, your product has been used in developing TACM(Torpedo Acoustic Counter Measure) detecting equipment manufactured by LIG NEX1.
On behalf of Korean DoD(Defense Of Department), we are checking EOL/status information on the parts of system. At the next year, the TACM equipment will be going to operate. Accordingly, Korean DoD hopes to know the information related with product EOL(End Of-Life) to sustain equipment operation.

Part Number: OPA827AID
Part Application: TACM, CCA(T/R Switch Transfer)

In case of part obsolescence, our military and Korean DoD hopes to know the information related with product EOL(End Of-Life).
So could you provide me some information of the item?
I need the data below.

1. Start of Production(Release date/Start of selling Point) : YYYY-MM
2. Discontinued or Not : Y or N
3. End of Production/Expected EOL Point : YYYY-MM(If it was discontinued/will be discontinued or have plan to discontinue)
4. End of Sales : YYYY-MM(If it will be discontinued or have plan to sell)

If the item has not any discontinuance schedule, please let me know.
Korean DoD will use the information above only for the research and the next purchase.

Feel free to contact me if you have any further information of me and my company.

Part Number:OPA2227

This is Joong-hyeok Lee, DMSMS researcher of Leoinnovision.

Leoinnovision is the official EOL(End Of-Life)/obsolescence part manager of Korean Military (Army, Navy, Air force) and PLM agency of many defense industries (Hanwha, ADD, etc.)
Especially, your product has been used in developing TACM(Torpedo Acoustic Counter Measure) detecting equipment manufactured by LIG NEX1.
On behalf of Korean DoD(Defense Of Department), we are checking EOL/status information on the parts of system. At the next year, the TACM equipment will be going to operate. Accordingly, Korean DoD hopes to know the information related with product EOL(End Of-Life) to sustain equipment operation.

Part Number: OPA2227UA
Part Application: TACM, CCA(T/R Switch Transfer)

In case of part obsolescence, our military and Korean DoD hopes to know the information related with product EOL(End Of-Life).
So could you provide me some information of the item?
I need the data below.

1. Start of Production(Release date/Start of selling Point) : YYYY-MM
2. Discontinued or Not : Y or N
3. End of Production/Expected EOL Point : YYYY-MM(If it was discontinued/will be discontinued or have plan to discontinue)
4. End of Sales : YYYY-MM(If it will be discontinued or have plan to sell)

If the item has not any discontinuance schedule, please let me know.
Korean DoD will use the information above only for the research and the next purchase.

Feel free to contact me if you have any further information of me and my company.

Part Number:OPA316

Hi!

I have recently designed a simple non inverting amplifier using the OPA316. Here are the key parameters:

+IN: Connected to GND

-IN: Input signal (-200mV to 0V)

Supply: V+: +3V, V-: GND

Amplification: -13,5 (R_in=2k, R_f=27k)

The datasheet states that Vcm can be as low aus (V-) - 0.2V.

In theory the output voltage at -IN=-100mV should be +1,35V. However, when measured V_out is at 1,65V with both inputs at GND+/-V_os.

This leads to my assumption that with this setting much more current than expected (and desired) flows into the -IN pin. Is this plausible?

Is it even recommended for this opamp to have an input signal below V-? Is there an alternative that is suitable for this application?

Kind regards,

B.Hofer

Part Number:INA2128

Hello,

I'm using INA2128 Instrumentation amplifier for Analog Out amplification(Gain=2). I'm testing the amplifier circuit for frequency response and response time using a recording tool. Below is the graph for comparison between Analog Out before and after the Amplifier circuit. It seems like the Amplifier out is not averaging at higher frequencies for some reason and there is an attenuation issue, is this because of some filtration or aliasing? I can provide the schematics as needed.

Please help me understand the issue and what would be a fix for this kind of behavior.

Thanks,
Naveen.

Part Number:ISO124

Hi expert,

My customer is using ISO124U and the project is moving to the mass production stage, but customer found the drift during the negitive temperature range is more sensitive / worse than in during the positive temeprature range.

could you please help comments on this? is it really the drift performance is more sensitive during the negitive temperature range?

customer's system accuarcy target: 0.5%:

1, 25C: can meet 0.5%

2, 75C, can meet the 0.5%

3, but -25C, cannot meet the 0.5%

Best regards

Iven Xu

Part Number:TLV521

Hi.

I tried to find the input resistance and capacitance value of TLV521 on its datasheet, but thers is no informations about this.

So, I wonder the input resistance and capacitance value of TLV521 amplifier.

Is there are any informations?

Part Number:XTR117

Hi,

I'm already have designed products with XTR117 + MSP430FR4133 with loop power, and they are working perfectly on various sites.

Now I'm designing a product with inbuild SMPS, can power to pulse transmitter (such as NAMUR) and can give an active 4-20mA current. I'm having trouble i.e. the circuit is not giving the output.

My circuit is attached.

Thanks & Regards,

Harish

Part Number:PGA280

I need some informations about the noise of the PGA280. We are currently reading data with a 24bit ADC. The ADC samples @ 4 Khz.

We hasn't implemented a digital filter yet because we want to test the noise performancie of each stage of the system, first of all.

The following are the parameters used for the PGA configuration

PGA280_REG_GENERAL_CONFIG_1 = PGA280_MUX_DIS | PGA280_IAR_ERR_EN | PGA280_BUF_POL_HIGH_ACTIVE | PGA280_ICA_ERR_EN | PGA280_ED_BUF_EN | PGA280_OUT_ERR_EN | PGA280_GAIN_ERR_EN | PGA280_IOV_ERR_EN;

PGA280_REG_GENERAL_CONFIG_2 = PGA280_ERROR_LATCH_EN | PGA280_ERROR_DIS_CYCLES_0 | PGA280_CHKSUM_DIS;

PGA280_REG_GPIO_DATA = PGA280_GPIO_LOW(6) | PGA280_GPIO_LOW(5) | PGA280_GPIO_LOW(3) | PGA280_GPIO_LOW(2) | PGA280_GPIO_LOW(1) | PGA280_GPIO_LOW(0);

PGA280_REG_GPIO_CONFIG = PGA280_GPIO_DIR_OUT(6) | PGA280_GPIO_DIR_OUT(5) | PGA280_GPIO_DIR_IN(4) | PGA280_GPIO_DIR_OUT(3) | PGA280_GPIO_DIR_OUT(2) | PGA280_GPIO_DIR_OUT(1) | PGA280_GPIO_DIR_OUT(0);

PGA280_REG_SPECIAL_FUNCTION = PGA280_GPIO6_OSC_DIS | PGA280_GPIO6_SYNC_DIS | PGA280_GPIO5_BUF_EN /*@@@| PGA280_GPIO4_BUF_TRIG_EN*/ | PGA280_GPIO3_EF_EN | PGA280_GPIOX_MUX_DIS;

PGA280_REG_GAIN_AND_MUX = PGA280_GAIN_FACTOR_1 | PGA280_GAIN_1 | PGA280_MUX(0);

PGA280_REG_IN_SWITCH_1 = PGA280_IN2_SWITCH | PGA280_IN_SWITCH_C1_OFF | PGA280_IN_SWITCH_C2_OFF | PGA280_IN_SWITCH_D12_OFF;

PGA280_REG_IN_SWITCH_2 = PGA280_IN_SWITCH_F1_OFF | PGA280_IN_SWITCH_F2_OFF | PGA280_IN_SWITCH_G1_OFF | PGA280_IN_SWITCH_G2_OFF;

PGA280_REG_ERROR = PGA280_CHK_ERR | PGA280_IAR_ERR | PGA280_ICA_ERR | PGA280_OUT_ERR | PGA280_GAIN_ERR | PGA280_IOV_ERR;

The output of the PGA pass through an analog low pass filter with cut frequency of nearly 2Khz.

We have measured the performancies of the PGA280 and the ADC, first by short circuiting the ADC input to GND and after by short circuiting the PGA input to GND, to understand the noise production from each stage.

It's important to note that the internal Buffer at the input of the PGA has been disabled because it introduce a very high noise level and a big offset.

The input circuit of the PGA is supplied with +/-15V from a switching filtered through a pi-greek multiple stage filter. The output of the PGA is supplied by a linear supply of +/-1.5V.

The switching should have a ripple less than 20mV.

The performance measured is:

With the ADC input short circuited to GND we have an oscillation between 60 and 70 points as read from the ADC (24 bit)

With the ADC connected to the output of the PGA and the input of the PGA short circuited to GND we have an oscillation between 200 and 210 points if the +/-15V supply is provided by a switching, between 170 and 180 points if the supply is provided by an external stabilized linear supply. 

Is it the maximum noise performance we can obtain from the PGA? Is it possible to improve the noise performancies without sacrifice the bandwith?

Thanks

Part Number:TLC2201

Tool/software:TINA-TI or Spice Models

3,4 is without amp, and 1,2 is with amp.

I wonder before amp, the divider values are same, but after combining amp, why is the ouput of fig1 and 2 different?

if the input values are same such as 676.7mV, I think the amplifier values should be 676.7mV.

however fig 1 is 590.2mV and fig 2 is 523.3mV. can you tell me the reason?

Part Number:opa827

Is there a plot available for current noise density vs frequency?

Part Number:OPA1622

Hi all

Would you mind if we ask OPA1622?

Do you have data "Positive Output Voltage vs Output Current" and "Negative Output Voltage vs Output Current" with VS = ±15V, and RL = 2kΩ.
On the datasheet, there are data with VS = ±18 V, and RL = 2kΩ.
(The current is the same value, so will output voltage be different?(approxy ±14.2V?))

With Tina-TI's data, we found data with VS=±15V.
However, we guess that its conditon is Ta=25C.(We need data with Ta=-40C, 85C, 125C also.) 
(Please visit the site to view this file)

Kind regards,

Hirotaka Matsumoto

Part Number:opa128

Hi,

This question relates to application note sboa061.pdf,  "DESIGNING PHOTODIODE AMPLIFIER CIRCUITS WITH OPA128"

I'm interested to understand the bias part of the photodiode circuit, figure 4.  There is an error in the circuit diagram I think -  the bias supply for the photodiode is currently marked as ground.  Presumably both the resistor and the 0.1uF capacitor are connected to the bias supply?  It should be obvious but I can't quite see the function of the resistor and capacitor, so hesitate to guess (and wonder what value to use for the resistor). 
 Wouldn't  the circuit still function if those components were omitted, and the photodiode connected directly to a bias supply, and also have less noise?

www.ti.com/.../sboa061.pdf

Thanks, Peter

Part Number:TLV274

Hello,

Someone can tell me if this AOP, TLV274 , has internal protection diodes on its inputs V+ and V- ?

Part Number:INA116

Dear TI Technical Support,

I am currently working on a measuring circuit that measure the capacitance in a DC circuit. I have posted my Schematics  in this post.

The output readout at the oscilloscope screen is not as we expected. As the voltage across the two capacitors is 6V, we expected to see the voltage across the larger capacitor to be 1.1V with RG = 50kOhm, and 0.55 with RG = infinity (not connected).

1. However, while the VCC and -VCC are held stable at 15V and -15V, there are occasions that the oscilloscope still read a few volts even when the battery to the two capacitors are disconnected.

2. The output of the oscilloscope seems to be influenced by electromagnetic interference. When  I curbed my hand and periodically move my hand closer to or away from the two Vin+ and Vin- wires, there was oscillation at the readout.

3. When i switched the order of the two capacitors but still measuring across the larger capacitor, the voltage readout of the oscilloscope was not the same.

4. Sometimes, I see the voltage readout is reversed, sometimes it was upright.

I did connect guard- to guard- and guard+ to guard+ pins. I also connected two pairs of capacitor and resistor to ground like the figure 3 page 8 of the datasheet, but the behavior persists. I also made sure that the common-mode voltage of the measured capacitor is small (it was about 250mV).

I understand that some of these issues are very simple to fix, but this is my first time working with op amps in general. So I really appreciate your support.

Sincerely,

Khoi Ly

University of Colorado Boulder.

Part Number:OPA1642

Hi. 

I have problems with the bias voltage of a buffer circuit. 

I can´t manage to make the bias Vin/2. My supply is 5V. And I have tried to adjust R2 with a higher value,

but even with 5V out of the voltage divider the bias voltage won´t go over 2.1V.  (See att.)

What is wrong with the circuit? Why is the input current so high? According to the datasheet the input bias current should be around 2pA.

I also tried with a input impedance of 470k (R3), but I still couldn´t get it over 2.2V.

Are there any problems with attenuating the output back to the voltage devider? I thought that would work as a virtual ground with sink/source capability.

Part Number:LM8261

Hello,

I currently use LM8261 in an improved Howland current pump design. Current pump is supplied by +/-5V sources and is designed to output 100kHz sinusoidal 4mA pk-pk current. It is aimed to be injected in a human body (end application is for bioimpedance, load range equivalent to 300 to 1500Ohms). It works and seems to be stable without capacitors in the feedback networks. LM8261 offers rail to rail output with low current consumption. Output impedance is about 70kOhms from my simulations and practical measurements.

I went through several documents and papers stating that higher slew rate and higher GBP lead to higher output impedance. Claimed output impedances can be up to 1Meg. I’m not sure stability has been assessed in all studies. Stability topic has been covered in some posts on your forum (Thank you to Tim Green. He posted the following interesting document “To Design and Apps Current Sources_AFA.ppt”).

I went through AN1515 application note. It covers op amp selection and provides some references but GBP and SR of listed references are not really higher than the one I use.

I then used the TI op amp parametric table to find low power rail to rail wideband op amp. Unless I incorrectly used the filters, I didn’t find low power wide band rail to rail op amp in +/-5V power supply range. From my investigation I finally picked OPA890 and compromised on the rail to rail feature. In simulation current pump with OPA890 provides about 250kOhms. However it requires capacitor in the negative feedback to be stable. Then output impedance decreased to 47kOhms with a 5pF in the negative feedback.

If I incorrectly used the parametric table, do you have in your portfolio op amp similar to LM8261 but with slew rate and bandwidth similar to OPA890 or OPA690?  

What makes LM8261 stable without feedback capacitors? Is it related to its Unlimited Cap Load feature?

Please let me know if from your experience you have any advice, suggestions to design a high output impedance current source (output current from 100kHz to 150kHz).   

Thank you in advance for your remarks. 

Part Number:INA217

Hi everyone,

I have no experience with IA before. I wanna make a precise subtractor and amplifier for a signal conditioning circuit to the ADC of DSP.  My schematic is attached below. The signal VOSENSE is from -10.5V to 0V. My problem is that when the offset voltage (point A) is -10.3V (because the power supply is not exact -15V), the voltage of point B is only -7.22V. I checked the input impedance of pin 5 of INA217 (R14 was removed), it was 1.78 Mohm.

If I change R14 value from 10k to 47 Ohm, IA gets hot (44 degrees), the voltage at point B is slightly reduced to 10.2V.

I do not understand why the input signal going through R14 is degraded if the input impedance of IA is very high. Anything about this IA which I misunderstand here.

Thank for your help

Part Number:INA149

Hi,

I was searching for a differential/instrumentation amplifier that can measure voltage in the range of 0.5V to 2V (measuring AA cell's voltage connected in series, 3 cells).  The supply voltage of the amplifier will be 2.8V which is external and not from AA cells.

I found INA149 which seems to be working for me but looking into details I found that part will actually be overkilled for the application. It has more electrical ratings than required and because of that part is also bulky (SOIC). Could you suggest some part or alternate suitable for my application?

Regards,

Manoj Rahel

Part Number:OPA350

Hi sir:

    when we welding the OPA350 chips. someone is failure. So may i get the requirements of  how to welding the chips?