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ADS1259
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  • Forum Post: "Comparing SAR and delta-sigma ADCs' throughput times", EDN, 4/22/2010

    Bonnie Baker - WEBENCH Design Center
    From: Feng Dear Bonnie, I read your article about “Comparing SAR and delta-sigma ADCs’ throughput times” in latest issued EDN. In fact, I’m in similar situation now. I’m planning to use TI 8 ch, 24 bit, 30kSPS, with internal PGA, ADS1256 for our new data acquisition...
    on Jun 1, 2010

  • Forum Post: Re: ADS1298 connection with MSP430F2272

    Yan Jia-hong
    做 你能給我一個源代碼，以ADS1298為 MSP430 ，磷租賃？ 我的郵件： asusm6nb@'gee'mail.com
    on Aug 12, 2010

  • Forum Post: Problem communicating with ADS1259 using MSP430 SPI

    UTB
    Hi, I am using the MSP430 in the ez430-RF2500 development kit to communicate with an ADS1259 via SPI. I am trying to initialize the ADC with the following Code Composer code, but it doesn't seem to work. The MSP430 gets stuck during "while (!(IFG2 & UCB0RXIFG));" as if it can't...
    on Nov 1, 2010

  • Forum Post: Re: ADS 1259 Negative analog power supply.

    Bob Benjamin
    Rahul, You would refer to the power supply ground. Depending on what kind of supplies you are dealing with you have a couple of different way to hook this up (such as a dual output +/- supply versus two separate single supplies.) Ultimately you need to have a common ground point on your board where...
    on Jun 17, 2011

  • Forum Post: Re: ADS 1259 Negative analog power supply.

    Bob Benjamin
    Rahul, This is kind of a tough concept as ground for the analog supply doesn't seem to connect to the device. However, there is a relationship between AGND and DGND. There is also a relationship between the analog input voltage and digital ground. So internal to the device there exists a path...
    on Jun 17, 2011

  • Forum Post: Re: ADS 1259 Negative analog power supply.

    Bob Benjamin
    Rahul, Do not place anything between the grounds. You want a very low inductance path between the grounds. For example, if you place an inductance between the grounds and you have EMI/RFI across the inductance, it is very easy to exceed the maximum difference between the grounds of 0.3V. The best...
    on Jun 20, 2011

  • Forum Post: ADS1259 reading improvement techniques

    Rahul Nadgouda
    I am evaluating ADS1259 using ADS1259EVM. Other than taking care on the PCB and software calibrations for getting accurate readings...I want to know whether there are any techniques on the schematic to reduce the errors in readings. I have taken care on the power supplies by providing decoupling caps...
    on Aug 21, 2011

  • Forum Post: Re: High resolution, low noise, feed symetrical ADC

    Bob Benjamin
    Piotr, Welcome to the forum! When you say symmetrical, are you referring to a signal that is 100mV above and below ground? If so, you may want to take a look at the ADS1248, or ADS1258 operating with bipolar power supplies. Also the combination of the PGA280 and ADS1259 may also work for you. Best...
    on Nov 28, 2011

  • Forum Post: ADS1259 parameters and software

    David Musoke
    on Dec 4, 2011

  • Forum Post: Re: PGA 280 SPI driver.

    Rahul Nadgouda
    Hi, In the earlier posts on the same thread I asked a question regarding the data to be collected from the ADC. What is the meaning of the following statement in datasheet Page 31 : "The read data command must be sent at least 20 f CLK cycles before the DRDY falling edge or the data...
    on Dec 8, 2011

  • Forum Post: Re: PGA 280 SPI driver.

    Rahul Nadgouda
    Hi Luis, On your reply to the 1st question. I am using 10 SPS, so I should get the DRDY falling edge or DRDY bit in CONFIG2 register goes low every 100 msec.(however I get the DRDY falling edge every 200 msec i.e it takes double the time for all SPS configurations, we can discuss this separately ...
    on Dec 10, 2011

  • Forum Post: Re: Best power supply filtering for high precision (24-bit) ADC's?

    David Musoke
    Tom: Thanks for getting back to me so quickly! Relieved to hear that its quite simple to get the datasheet performance of the ADS1259 by simply using planes, good linear regulator and the REF5050 for the reference pins. I will be using +/-12V supply rails from the +/-14.8-15V input power source...
    on Dec 17, 2011

  • Forum Post: Re: Location of the PGA280 + ADS1259 analog and digital ground connections.

    Bob Benjamin
    David, There are a number of issues to consider. What are all the ramifications for having a split plane versus single plane? If you split the planes what kind of ground loops might be created if you bridge the grounds under each device? If you star ground each device back to the power entry, what...
    on Dec 23, 2011

  • Forum Post: Location of the PGA280 + ADS1259 analog and digital ground connections.

    David Musoke
    Hi All: My application calls for 16 PGA280 +ADS1259 pairs. My question regards the location of the analog and digital grounds connections. I've read the FAQs about board layout as well. Where should this connection occur? I thought it should be at the power supply input connection but the FAQs...
    on Dec 23, 2011

  • Forum Post: Dual ADS1259 noise specs(?) and other stuff

    David Musoke
    Hi: 1. I have attached the following graphic from the ADS1259 datasheet tat shows it has 2 noise specs (~ 1uVrms and 6uVrms) for the 14.4Kbps datarate. Is this correct or a typo? 2. Also, how do i configure the ADC for use in a ratio-metric application as this is the most precise mode of operation...
    on Jan 4, 2012

  • Forum Post: ADS1259 Calibration

    Justin Forrester
    Hello, I could use some clarification on the calibration procedure for the ADS1259. To perform the offset calibration, you tie the inputs to ground (or just tie them together?) and send the OFSCAL command and to perform a gain calibration, you apply the full scale voltage range and send the GANCAL...
    on Feb 27, 2012

  • Forum Post: 50/60 HZ Rejection

    Mateus
    Hello all, I need some help about 50/60Hz rejection of ICs ADS1248, LMP90100 and PGA280 + ADS1259. According to datasheets: ADS1258 -> -71/-74db (50/60Hz+-0,3Hz) and -66/-68db (50/60Hz+-1Hz) at 20 SPS (Table 9) LMP90100 -> more than -100/100dB (50/60Hz+-0,3Hz) and more -90/100 (50/60Hz...
    on Mar 23, 2012

  • Forum Post: PGA280 Power Consumption

    Mateus
    Hello all, In need some help about power consumption using PGA280 and ADS1259. Datasheet is not so clear about this topic, only providing quiescent current. I'm using: VSP = +15V VSN = -15V VSOP = +2,5V VSON = -2,5V DVDD = +5V What will be the worst consumption using this...
    on Mar 28, 2012

  • Forum Post: Noise Measurements with ADS1259EVM and PGA280

    Gary Cochran
    I try to evaluate the ADS1259 using an ADS1259EVM development board. I need to do some noise measurement with both inputs of the PGA280 of that board to ground. I use external reference (the one on the board) and the VOCM is connected to half AVDD. When I do measurements at 60SPS with SYNC2 enabled...
    on Jun 27, 2012

  • Forum Post: ADS1259 DRDY Output

    Justin Forrester
    Hello, I am having an issue where I am getting duplictate/inserted data points when sampling from the ADS1259. As a test I set up a GPIO line on my processor to output high when two sequential readings are equal and low when they are different. I then used that as a trigger on my scope to see what...
    on Jun 12, 2012

  • Forum Post: RE: ADS1259 DRDY Output

    Bob Benjamin
    Justin, Were you able to resolve your issue? Usually these types of issues are related to timing. Best regards, Bob B
    on Aug 3, 2012

  • Forum Post: ADS1259+PIC18F2520+MPASM code example

    Alex Bell
    Hi! This is my first post, so excuse me for any inconvenience :) I was searching some time ago for information needed for my project that uses TI ADC ADS1259 + PIC18F2520 MICROCHIP MCU + MPASM ASSEMBLER and found no examples or information for this combination. So here is the part of working code. Maybe...
    on Sep 28, 2012

  • Forum Post: RE: ADS1259 Gain Error Confusion

    Bob Benjamin
    Hi Martin, Welcome to the forum! Sometimes we try to give as much information as we can because of questions from the past, and sometimes that information can become confusing. I think that is what is happening in this case. 5 devices is a pretty small sample size. Basically the first graph you reference...
    on Dec 7, 2012

  • Forum Post: RE: ADS1259 without buffer at input

    Bob Benjamin
    Hi Vinayak, You've added a significant new issue from your first post. You have now gone from a current divider to a voltage divider. For my first response all that was needed was a simple RC anti-aliasing filter (approximately 50 ohms and 10nF.) If the desire is to create a low frequency filter...
    on Dec 12, 2012

  • Forum Post: RE: ADS1259 without buffer at input

    Bob Benjamin
    Hi Vinayak, If you use a series resistance of 100k, you will need a buffer. When you say you did not get the expected results, what do you mean? What were the test conditions? What did you expect and what did you get? I can try to duplicate your setup, but I need more information. Best regards, ...
    on Dec 12, 2012
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