↧
LM2903V: LM2903AVQDR SGS report
↧
PGA309: Calibration Algorithm
Part Number: PGA309
Hi,
To find Gain_dac and Vzero_dac at each temperature, I use the Calibration Algorithm you provide. I have a few questions :
------------------------------------------------
At the step 2, I have to change the GI (Front Gain) to improve the Vin calculation following this algo :
In my exemple Vin_min is negative... So, is the absolute value can be use ? (it seems to be right)
---------------------------------------------------
After the end of the step 6, I know (in my exemple) :
Vin_min : -1.327mV,
Vin_max : 25.314mV,
Total Gain 158
GI 64,
GO 3
and so on ..
At the step 7, I have to : "Solve for Vcoarse_offset to cancel Vin_min"
using the formula : Vcoarse_offset = -Vcoarse_offset... Is it a mistake ?... It should be Vcoarse_offset = - Vin_min? right?
And is the result of Vin_min + Vcoarse_offset has to be positive or not necessary ? (it seems to be not)
As a result the following formula is never used in the algorithm ?
↧
↧
OPA549-HIREL: OPA549-HIREL
Part Number: OPA549-HIREL
Dear TI Team,
Greetings!
I wish to use OPA549-Hirel (datasheet here, (Please visit the site to view this file) in an application to drive the resistive load sinusoidally at 50 kHz (kilohertz) rated 8 Watts at around 4.25 Vrms (Load 8W,4.25 VRMS, 50kHz) with a dual power supply of +/- 6 VDC for OPA549-Hirel configured in Non-Inverting Amplifier mode. I am planning to select this OPA549-Hirel as it is stated that the internal power dissipation can be minimized using minimum possible supply voltage to maintain the required output voltage swing. I request you to give me a straight forward formula with explanatory notes such that I can calculate internal power dissipation for AC loads for OPA549-Hirel. Thanks and Regards, Ajay Chole
↧
OPA180: input bias current spec
Part Number: OPA180
Hi I am not sure how to read and use the min and max of the input bias current, I can see for the typical curves how the bias current trends.
min is given as 18nA and max +-6nA. Can you explain how you would design with these specs in mind?
↧
AMC1300: Noise reduction in AMC1300
Part Number: AMC1300
Dear sir,
We are trying to measure the AMC1300 for inverter output voltage measurement. Please find the below attached screenshot for the circuit.
PWM Carrier frequency : 17240Hz
Reference sine waveform frequency : 50Hz.
Load resistive load
We are getting lots of noise in the inverter bridge output. Please find the attached screenshot.
SPWM carrier frequency : 17240Hz, Reference sine : 1Hz, Y axis scale : 10V / div, X axis scale : 50uS
SPWM carrier frequency : 17240Hz, Reference sine : 1Hz, Y axis scale : 500mV / div, X axis scale : 50uS
SPWM carrier frequency : 17240Hz, Reference sine : 10Hz, Y axis scale : 10V / div, X axis scale : 50uS
SPWM carrier frequency : 17240Hz, Reference sine : 50Hz, Y axis scale : 10V / div, X axis scale : 50uS
Could you please suggest the suitable filter (hardware component or use software filter after data acquisition) to get the output waveform without noise.
Thanks & regards,
Rajasekaran
↧
↧
OPA2694: Follower mode
Part Number: OPA2694
Hello,
Can the OPA2694 be used in follower mode (meaning no Rg)? Any special things to know about this IC in unity-gain mode?
The datasheet only mentions "Note that a 430Ω feedback resistor, rather than a direct short, is recommended for the unity-gain follower application" and "UNITY GAIN STABLE BANDWIDTH: 1500MHz"
What BW can I expect with small signals, unity-gain mode with Rf=430ohm and no Rg?
Thank you
Nicolas
↧
Ultrasound Amplifiers
Hi all,
I am trying to look for ultra sound amplifiers of range of frequency from 10Khz - 65Khz. Amplifier should provide a peak to peak voltage of 25 volt sine wave. Please help me guys. I am not able to find it.
Thanks & Regards
Prateek Hegde
↧
INA290-Q1: Release date
Part Number: INA290-Q1
Hi,
Could you tell me when this product is going to be released and when can I purchase it?
-Bram
↧
Where is LM11 Op Amp in Ti "Applying a New Precision Op Amp" App note?
I keep seeing LM11 and LM11C in the example schematics of this app note;
"Applying a New Precision Op Amp"
Does anyone know what this Op Amp is? I can't find any info! Even on Ti's site!
Thanks.
↧
↧
Amplifier that cuts off 0-300 Hz sharply, digital filtering and pass the rest
Hi Team,
I am posting this on behalf of our customer:
Our customer needs a device that can Amplify audio with a sharp cutoff from zero to 300hz.
Do we have a reference design or a TI product to start for this design?
At the moment the customer is using Bose system that goes around his neck and has the rechargeable features. It has noise cancelation but the amplifier is wide open and any background noise cuts down the function. So there is no need for noise cancelation if the amp filters everything below 300 Hz.
The customer will order for mass quantities if ever we have this kind of device or reference design available.
Please let me know if you need more information.
Thanks!
Jonathan
↧
TLV9062: Dual or alternative PCB footprint for second sourcing P2P op amps, like TLV9062 in SOT23 package
Part Number: TLV9062
Hello,
I want to use the TLV9062 in DDF(SOT23-8) package in my design, but there is not another supplier that offers this package. Is there a way I can use the DDF package and have a second source for my design?
Besides TLV9062IDDFR, do you have any other amplifier options with the same package?
Thanks.
Katherine
↧
INA286: What is the internal clock frequency?
Part Number: INA286
In the datasheet it mentions an internal clock (page 14), but no information about the frequency or how to use it.
- what is the clock frequency?
- how do you use it?
- why does this part have an internal clock?
Thank you!
↧
LM293: why there are 3 marking options for lm293dgkr?
Part Number: LM293
Hi Team,
Could you please explain what is the different type of marking of lm293dgkr device.
please find below the table marked with the blue arrow.
What will be the device marking? why there are 3 options?
Thanks in advance.
Regards,
Shai
↧
↧
TLV1702: Dual comparators not working simultaneously.
Part Number: TLV1702
We are using samples TLV1702-Q1 for our design with 5V supply and pull up resistor of 1k ohm.
Of the dual comparators, one is working fine but the second gives a high output of around 2-2.1V continuouly.
We've tried with multiple samples but the result is same, though for sure the design is correct, and also the design self verifies by the fact that sometimes the first and sometimes the second shows this behaviour.
Is there any specific reason for why this is happening?
↧
LM7301: Please recommend a voltage reference of 1.5V for LM7301IM5/NOPB
Part Number: LM7301
Please recommend a voltage reference of 1.5V for LM7301IM5/NOPB.
↧
TLV3501: TI-TINA simulation wrong result of TLV3501
Part Number: TLV3501
HI,
When I use the TI-TINA to simulate the comparator TLV3501, I got wrong results. Two pictures above are the circuit and results.
VFN means the negative input pin and VFP is positive pin, and you can see the vout is not equal to the sign(VFP-VFN), I did not know why.
And, I have tried the other comparator in the TI-TINA, and got the same result.
BUT, using ideal amplifier can get the right result!
Is the simulation model of comparator wrong?
↧
THS6212: VDSL line driver
Part Number: THS6212
Dear Sir:
I am searching for a suitable VDSL line driver.
TI THS6212/6214, OPA2673, OPA2670 seems all can support VDSL2.
Pls can you teach me where I can find more detail information?
My basic requirement is:
Sustaining chip/product
Single channel
Support AVD with better US0, 17a, 30a performance
Afford O/P power 14.5dBm
↧
↧
ISO224: Can we just measure unipolar DC signals without losing 1/2 of the resolution?
Part Number: ISO224
We are looking to use ISO224, but we need to measure unipolar DC signals. The IC has bipolar input/output and then we use a bipolar ADC (Delfino device). We only have unipolar input signals so we lose ½ of the resolution. The solution would be to add a negative offset so we can measure 0 to 24V input signals (-12V to +12V after the offset). Do you have any suggestion to accomplish this so we don’t have to reinvent the wheel?
Some requirements below (this is why the ISO224 was selected).
-needs to be pin compatible part for ISO7721D (in the small package, with a higher isolation voltage)
-we need 1000V working voltage
↧
Need to modify SBOA233- voltage-to-current converter circuit for- 0 to 1024uA
Hi,
I want to modify the circuit in SBOA233 to the below requirements
1. Vinput= 0- 12V
2. Iout= 0 to 1024uA
3. Compliance voltage 12V.
I tried modifying the circuit for the above ranges, by replacing the OPA and INA, but could not get successful results.
Kindly guide me for the new changes.
Regards
Krishna
↧
Hi, I have a question about closed loop OPAMP frequency response.
Hi,
If OPAMP's unity gain frequency is Fu.
In non-inverting opamp, Fu = Acl * Fcl(closed loop corner frequency)
In inverting opamp, Fu = (Acl+1) * Fcl.
I cannot understand what makes this difference between two topology.
Can you explain in more detail how come non-inverting topology has higher corner frequency than inverting topology?
↧