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PGA280
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  • Forum Post: PGA280 Divider Question

    ClayCope
    I do have one technical issue that’s keeping me from moving forward with the PGA280. The 1/8 gain isn’t small enough to get the input range that I need. We have to support a +/-10V range, which means that we need to have a measurement range that’s +/-11V. With 1/8 gain, I get 1.375V...
    on Jul 28, 2009

  • Forum Post: Re: PGA280 Divider Question

    ClayCope
    I received an answer through another channel but thought I'd post it here for everyone else. Your suggestion, dividing down the output voltage between VOP and VON is perfect. Depending on the next stage (is it a SigDel converter ?) the resistor values should perhaps be somewhat lower. Assuming...
    on Jul 28, 2009

  • Forum Post: Re: PGA280 Divider Question

    Foe
    Clay, Thank you for posting the answer here as well! You rock!
    on Aug 8, 2009

  • Forum Post: Help- PGA280

    SciMan
    I was going through the data sheet of PGA280. On page 15, Fig. 37, Fig. 38 and Fig. 39, the curves show that the output swings to 8 V. However, as per the test conditions on the top of that page, the VSON = 0 V and VSOP = 5 V. Does this mean that the output swings more than the power rails (in this...
    on Dec 14, 2009

  • Forum Post: Re: PGA280 Distortion above 20kHz

    Joseph Wu
    I got this response from the designer: *** Yes, we have seen distortion at large signals with increasing frequency. This is at a little bit lower frequencies than what we have seen, but still in the ballpark. It has to do with the general architecture of the part. As the topology strongly...
    on Feb 22, 2010

  • Forum Post: Re: Help- PGA280

    Joseph Wu
    I just noticed that this question had not been answered. Sorry about the delay. I believe that the curves reflect the fact that the output is fully differential and that VSON and VSOP go from 0V to 5V respectively. In the case of a swing of 8V, the swing goes from +4V to -4V. At the most positive...
    on Feb 22, 2010

  • Forum Post: PGA280 , No output signal, Please help

    TYB
    Dear all, We are a set of undergraduates doing one of our projects. We need to use a programmable gain controller to control the gain coming out from a multiplexer. We are going to input the output of the Programmable gain controller to an ADC. We have selected PGA280, since it can attenuate as well...
    on Mar 7, 2010

  • Forum Post: Re: PGA280 , No output signal, Please help

    Joseph Wu
    Thilina, I think you'll need to redo some of the supplies to get this to work. First, I would note that VSON should be tied to GND and I would use a -12V supply on VSN. The problem is that the lower bound for the input range for the PGA is 2.5V above VSN. With INN1 grounded you would need VSN...
    on Mar 8, 2010

  • Forum Post: A Tina Ppspice model or reference test circuit for this PGA280?

    Tai Tran51585
    Hi, I can not find Tina spice simulation or EVM for this PGA280. Can TI send us a Tina Pspice model or TINA-TI Reference Design for this PGA280? I look forward for your prompt response. Thanks & regards, Tai
    on Aug 3, 2010

  • Forum Post: Re: A Tina Ppspice model or reference test circuit for this PGA280?

    Joseph Wu
    Tai, Due to the complexity and the digital nature of the part, we have not developed a model for any simulator for this part. However, the PGA280 is incorporated into the ADS1259EVM and can be controlled and tested through the ADCPro software in the ADS1259EVM-PDK. Joseph Wu
    on Aug 3, 2010

  • Forum Post: max load for the PGA280

    Ahmed Shaaban55791
    I will connect the PGA280 to PULSAR SAR from Analog device AD7684 which has input impedence 600 ohm durring the acquisition . Can I connect pga280 directly to it without buffer ?
    on Aug 28, 2010

  • Forum Post: PGA280 Long Term Gain Drift

    Wes Wirth
    Hello, I'm looking for data on the PGA280 related to long term GAIN drift. The DS lists this for the offset but not for gain. I see the gain error drift distribution graph but this is not quite what I'm looking for as it's not a 300hr life test similar to the testing done to get the...
    on Jan 5, 2011

  • Forum Post: Re: PGA 280 Help

    Rahul Nadgouda
    Hi Luis, I did the experiment you told me to do. When INN1 is connected to ground then the o/p voltage becomes stable.At 4 volts it shows 0.125v above and below GND. Also the input voltage to PGA is well within range. However my requirement is a pure differential input voltage to be given to PGA...
    on Jul 8, 2011

  • Forum Post: Re: PGA 280 Help

    Rahul Nadgouda
    Hi Luis, The input signal is going to be +/- 10v differential. There is not going to be a common mode input to PGA. The frequency of the input signal will be lesser than the slew rate of PGA. A DC signal is also expected at the input. Well I wanted to ask you one more question. Even if we assume...
    on Jul 8, 2011

  • Forum Post: Re: PGA 280 Help

    Rahul Nadgouda
    Thanks for your replies. Luis Chioye It may be possible that in the set-up a ground loop may be formed; where one of the supplies is not at the expected voltage. Please see ADCPro plots below. I am going to check this out. Also we have strict requirement of diffrential input voltage. So i...
    on Jul 12, 2011

  • Forum Post: Re: PGA 280 Help

    Rahul Nadgouda
    Hi Luis, I think i have been a little ignorant to your suggestion of the input voltage to be within range of VSN and VSP. Also thanks for the detailed explanation that you have given so far. Ok, so you want to say that although calibrator is giving a differential output signal but the voltage w...
    on Jul 13, 2011

  • Forum Post: Re: PGA 280 Help

    Rahul Nadgouda
    Hi Luis, I apologize for taking so long to reply to your post sice I was caught up with some other work. Well you had told me to reference the i/p of PGA w.r.t board ground so that they dont go out of specified range (VSP - 2.5v to VSN + 2.5v) and hence i wont get any non linear behaviour at the o...
    on Jul 28, 2011

  • Forum Post: Re: PGA 280 Help

    Rahul Nadgouda
    Hi Luis, I conducted the experiment like you told me to. When i connect the voltmeter between one of the i/p of PGA and board ground and another voltmeter between the o/ps of PGA, then the o/ps stop fluctuating.Hence this concludes the issue. I have added a 1 Meg Ohm resistor between both the PGA...
    on Aug 2, 2011

  • Forum Post: PGA280 Settling times

    David Musoke
    Hi: I have need for for 0.001% settling time for the PGA280. The datasheet lists between 30-40us typical, dependingon the gains. 1. What is the maximum input voltage i'd need to guarantee my 15us time? 2. What is the maximum gain switching time from G=1/8 to G=128? Regards, David
    on Oct 13, 2011

  • Forum Post: PGA280 Souce Impedance

    David Musoke
    Hi: I plan to the PGA280 to read multiple(256) wide ranging voltages accross resistances of 1 ohm to 10Kohm (0.1mV to 5V). These would be at the inputs of several multiplexers. Will this create a problem for the PGA280? Does it expect a constant input impedance source? If so, then i'd need a buffer...
    on Nov 8, 2011

  • Forum Post: PGA280 Input Diagnostics

    Justin Forrester
    I am using a PGA280/ADS1259 combination and I would like to explore the input diagnostic options of the PGA280. According the the datasheet of the PGA280, it can be configured such that you can detect wire breakage, input disconnection, single-ended or differential inputs, and shorted inputs. What is...
    on Feb 27, 2012

  • Forum Post: RE: REg:PGA output 10mv and D12 internal sw turn on

    Ian Williams
    Hello Jagdish, I will attempt to duplicate this problem on the bench next week. I do not believe that this behavior of D12 is expected. Do you have any external capacitance at the inputs? Also, if you share your system schematic with me I will be able to more effectively resolve your issue. Best...
    on Mar 28, 2013

  • Forum Post: PGA280 Power Supplies

    Charles Ewing
    Question: Can the PGA280 be powered with +/- 5v to the high voltage supply pins (VSP = +5v, VSN = -5v), and the same +5v to the output supply pins (VSOP = +5v, VSON = 0v)? The application is digitizing negative-going signals in the 0 to -2.5 volt range; the PGA280 would be followed by the ADS1259,...
    on Apr 24, 2013

  • Forum Post: RE: PGA280 Power Supplies

    Ian Williams
    Hello Charles, You are correct in that the specs table requires VSP to be at least 1.5V above VSOP, but I'll test this to be sure. I should have a confirmation either way for you by tomorrow. Best regards, Ian Williams Linear Applications Engineer Precision Analog
    on Apr 24, 2013

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