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  • Forum Post: Re: analog to digital converter with registers and spi interface where would I post a question on that?

    Tom Hendrick
    Hi Josh, Please post your questions on the SPI interface here and we should be able to help you. Are these questions also related to your post regarding the ADS1256? Regards, Tom Hendrick
    on Jan 2, 2009

  • Forum Post: Re: I am having trouble with a anlog to digital converter ads1256 where should I post my code and question?

    Tom Hendrick
    Hi Josh, We may have a few code examples for the ADS1256 running on an MSP430, but we do not have the Arduino development system in our lab. If you care to post your code and questions here, we'd be happy to try and help! Tom Hendrick
    on Jan 2, 2009

  • Forum Post: Multiple Channels of ADS1256EVM

    Chun-ming Lo
    Hi, I wanna use three channels of ADS1256EVM to interface with three sensors by the aid of the DCP (Data Converter Plug-in). I succeeded in one channel now. How do I expand my system to three channel? Any tutorial or application note helps me? i have read the SLAA210A, "Getting Started with the...
    on Jun 25, 2009

  • Forum Post: Re: ADS1256evm

    Richard Oed
    Hakim, Could you let us know your register settings and your command sequence? Otherwise it is hard to decide what is going on. Regards, Richard
    on Sep 3, 2009

  • Forum Post: Re: ADS1256evm

    Richard Oed
    Hakim, The command sequence looks OK, but a couple of suggestions: You might want to issue a SYNC command after setting the data rate And, I would suggest to perform a self-calibration after the SYNC; but this is optional. From your code, I cannot tell if the CS\ of the device stays low during...
    on Sep 4, 2009

  • Forum Post: Re: ads1255(56) input range during system gain calibration

    Joseph Wu
    Peter, Yes, the input voltage can be larger than 2*VREF(/PGA). The calibration is meant to generally meant to calibrate for the errors between the size of the capacitors sampling the reference and the capacitors sampling the input. However, it can be used to adjust the magnitude of the full scale. Much...
    on Jan 11, 2010

  • Forum Post: ADS1256 Mux

    Gui Goretkin
    Using the ADS1256, at a data rate of 500 SPS, and gain of 1, and MSP430 I would like to know more about the proper use of the input multiplexer to obtain data from different/distinct analog sources. Right now, I have it configured to read data from mux: 05, 15, 25 (using channels 0, 1, and 2...
    on Jan 20, 2010

  • Forum Post: Re: ADS1256evm

    Joseph Wu
    Remi, Yes, the OPA350 operates from 0V - 5V as well, however with the resistor network and the 2.5V supply, it becomes a difference amplifier with the reference node at 2.5V. This will center the input common-mode voltage (as seen by the positive node of the OPA350) to 1.25V as the 2.5V supply is...
    on Apr 7, 2010

  • Forum Post: ADS1256 fast cycling

    Stephen47795
    Hi I'm working with the ADS1256EVM board. Right now I have the ADC working with my DSP (DSPIC33FJ256GP506). I need to cycle 3 channels and the output sampling rate must be at least 1000 SPS each, so 3000 SPS in total. My problem is that when I have to change the MUX register, I'm loosing too...
    on Apr 20, 2010

  • Forum Post: Re: Cycling the ADS1256 Input Multiplexer

    Tony Calabria
    Philippe, When you are in the "Read Data Continuously" the DIN is constantly monitoring and is able to decode op codes that are written to it. When you change the mux, you need to give the converter some time for the digital filter and modulator to settle before you can read valid data....
    on Apr 20, 2010

  • Forum Post: Re: Cycling the ADS1256 Input Multiplexer

    Tony Calabria
    Philippe, The ADS1158/1258 are the only delta sigma parts that we have that support an auto-scan mode. We have other multichannel parts, such as the ADS1255/1256 and the ADS117x/127x parts but they do not have an autoscan mode. The ADS1174/8 and ADS1274/8 are simultaneous sampling parts (think of...
    on Apr 26, 2010

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

    Olrik Maier
    Hi Feng, from my experince I would expect that the ADS1256 gives you better performance. However a good and easy possibility for you could be to use ADC Pro and the EVMs to find the better solution. That's what I would suggest to my customers to do for the comparison above. In addition they get...
    on Jun 21, 2010

  • Forum Post: Trying to read ADS1256 register's values

    FL53381
    Hi, I'm trying to read the ADS1256 register's values - which seem not the correct values that I got. Could you help to look into it? Thanks, Feng
    on Jul 13, 2010

  • Forum Post: ADS1256 conversion accuracy after self-calibration

    Carsten Gehrke
    My circuit uses an ADS1256 and applies differential signals to 3 of the 4 available pairs. One pair, AIN2 & AIN3, is only connected to test pins. After self-calibration, the ADC reports 3.13 VDC for a 2.996 VDC input signal (as measured with a 6-1/2 digit DMM), for an error of about 5%. If I perform...
    on Aug 20, 2010

  • Forum Post: Re: ADS1256 conversion accuracy after self-calibration

    Joseph Wu
    Carsten, Generally, the self calibration is pretty accurate and you should see a much lower gain error. The self calibration takes the reference input and puts that into the analog inputs through the interal mux and calibrates that voltage to be the full scale. If you are in a gain of 1, I would have...
    on Aug 20, 2010

  • Forum Post: Re: ADS1256 conversion accuracy after self-calibration

    Carsten Gehrke
    Hello Joseph, I am measuring the output of a power supply (Leader DC Tracking Power Supply LPS151) connected directly to AIN2 and AIN3. The reference voltage of 2.5 V is generated on-board by an ADR421 voltage reference, connected by one each 49.9 ohm resistor from V out to VRFP and GND to VRFN, respectively...
    on Aug 20, 2010

  • Forum Post: Re: ADS1256 conversion accuracy after self-calibration

    Joseph Wu
    Carsten, I've briefly looked at some of the numbers and it looks like you have a consistent gain error of about 4.50% or so. I just have a couple of thing to add or ask about. First, could you measure the reference directly? I know the ADR421 to be a pretty good reference, but it doesn't hurt...
    on Aug 20, 2010

  • Forum Post: Re: ADS1256 conversion accuracy after self-calibration

    Carsten Gehrke
    Hello Joseph, Before I made the recordings I posted earlier, I did measure the output of the voltage reference. It was 2.5000 V. This was also the case after the other measurements. I was not able to measure both the input and reference voltages simultaneously because I only had access to one DMM...
    on Aug 21, 2010

  • Forum Post: Re: ADS1256 conversion accuracy after self-calibration

    Carsten Gehrke
    Hello Joseph, This morning I was able to verify the reference voltage at the ADS1256 pins 4 & 3, and found it to be 2.4998 V. I also found that our circuit uses only a single 1 uF cap across these pins, not the 47 uF, 0.1 uF, and 100 pF combination shown in Figure 25.
    on Aug 30, 2010

  • Forum Post: Re: ADS1256 conversion accuracy after self-calibration

    Carsten Gehrke
    Hello Tony, The ADC buffer is disabled. One of the four analog input pairs is not connected to any part of our circuit, but the pins are accessible. It is to these pins that I have connected an external power supply (so that I can adjust the voltage being measured). I have also run some tests by...
    on Aug 31, 2010

  • Forum Post: Re: I have a problem to use the ADS1256EVM with MMB0 Development Board..

    Tony Calabria
    Hi Harry, The first time you attempt to run the ADS1256EVM plugin it has to install the USBstyx drivers in the background and ADCPro will read a timeout as this happens. You then close ADCPro. The second time you open ADCPro and try to run the ADS1256 plugin you should not have any problems (as USBstyx...
    on Oct 6, 2010

  • Forum Post: Multi scan ADC trouble with ADS1256.

    Hyun Woo Lee
    I'm trying to multi channel scan ADC with ADS1256. I already programed single channel ADC successfully. But multi channel scan has some problem. The data has gone wrong data... I scaned 8ch per 1ms. And I get the date when the DRDY pin goes low. Are there any other setting or instruction...
    on Oct 8, 2010

  • Forum Post: ADS1256 Analog input external filter requirements

    Alex Dunfield50166
    Hi, The ADS1256 datasheet recommends a low-pass filter on the analog differential inputs of the device. Is a filter recommended when the input buffer is bypassed, and if so, what are the recommended values? Our concern is to maintain < 0.1% accuracy on the readings. We are using the PGA = 1...
    on Nov 5, 2010

  • Forum Post: Re: LSB calculation for ADS12xx series of 24-bits ADC

    Bob Benjamin
    Josko, This is not straight binary, it is binary two's complement. This method is used so that you can have differential measurements in both the positive and negative directions. Maximum code in the positive direction is 7FFFFFh, which is 2^23-1. Similarly in the negative direction FFFFFFh-800000h...
    on Nov 10, 2010

  • Forum Post: Re: LSB calculation for ADS12xx series of 24-bits ADC

    Josko Marasovic
    Hello Bob! I still can't figure out this issue. Ok, binary two's complement but where has zero gone, the range from 000000h-FFFFFFh? This means that LSB weight is different in case of binary two's complement than in case of stright binary code? If I have 2.5V voltage on Vrefp pin...
    on Nov 11, 2010
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