Precision Data Converters

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Precision Data Converters

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A/D converters
Related Posts

  • Forum Post: ADS1112 scaling error

    Tony Sander
    I am experiencing a severe scaling error with this device. With the PGA set to x8 (256mV FS) I am getting the MSB at 01111111 with ~+182mV input. With the gain reduced to x4 (512mV FS) the MSB hits 01111111 at ~+285mV. Do I have damaged device or is this due to the input circuit impedance?
    on May 20, 2009

  • Forum Post: ADS1178 EVM IO Voltage

    Rob Mitchell
    I am trying to connect the ADS1178 EVM board using 1.8V I/O. The ADS1178 EVM has a 1.8V pin, J3.7, but it does not seem to be going anywhere. Is that correct? Another option is to bypass U16 on the ADS1178EVM and tie DVDD, IOVDD and 1.8V together at J13/J14. If I do this option, it looks like the...
    on Jul 9, 2009

  • Forum Post: ADS1243IPW offset problem in differential mode

    Pang
    Hi all, I am designing a 4 channel differential 4->20mA analog input using the ADS1243I from Texas Instruments. The front end basically consist of resistors network, since we are catering for both voltage input and 4-20mA input using jumpers. The problem comes when the value of some differential...
    on Aug 4, 2009

  • Forum Post: ADS1258 problem

    Erwin Saavedra
    hi everyone, i have a problem with reading the ads1258 and i would very much appreciate if anyone can help me. i have it connected to -2.5v and 2.5v (avdd and avss) and to 5v and 0 for the digital interface (basically the same as in the ECG reference). reference voltage is set at 2.5v (and also tested...
    on Dec 14, 2009

  • Forum Post: ADS1278 to OMAP3530 via SPI

    John Thomas43830
    We are building a connection between the ADS1278 (ADS1278EVM) and the OMAP3530 (Gumstix with PALO43). We will only be using one ADS1278 and therefore there will be no daisy-chaining of A/D devices. Some of the current issues unresolved are the following: 1. ADS1278 has no "chip enable/select"...
    on Feb 27, 2010

  • Forum Post: Re: ADS1298 open source design help request & this will assist open source and development & interest in the chip

    josh wojnas
    any sugjestions or problems with the design you noticed? Any of the ground or power at the wrong value etc?
    on May 3, 2010

  • Forum Post: Re: DDC EVM Channel Differences

    Jason Bridgmon
    Hello Drake, A good test to verify it is not something to do with the input is to put the device into test-mode by setting the TEST pin high and collecting data. If you still see radically different A side-B side matching data, then you can look to the reference or supply or something systemic...
    on May 6, 2010

  • Forum Post: Re: DDC EVM Channel Differences

    Jason Bridgmon
    Drake, We did some ballpark measurements on an EVM for a newer DDC product EVM and found trace capacitance to be from 9pF to 11.5pF. I would expect the DDC114 EVM traces would be similar. There is a document on the DDC112 EVM kit from 2000 that goes into some detail about how to lay out traces...
    on May 6, 2010

  • Forum Post: ADS1271: F_SCLK faster than F_CLK

    Sergio L.
    Hello, We're porting a design from a previous ADS to ADS1271. The system uses the SPI interface to read data with F_SCLK = 15 Mhz, but the conversion clock is set to F_CLK = 300 Khz aprox. This violates the technical specification, which states that fSCLK must be lower or equal than fCLK. We...
    on Jun 1, 2010

  • Forum Post: Noise on ADS1298

    MirkoMitrovic
    Hi, does anyone has experience with p-p noise of ADS1298? In datasheet I found 4uV p-p, and this is quite lot for EEG. Is there any information I've missed? Thanks, Mirko
    on Jun 3, 2010

  • Forum Post: ADS1278 spurious signal

    Roberto Signori
    I am using an ads1278 for signal acquisition. The device is connected to TMS320F2812 dsp for signal analysis. The problem is that I have always two spurious signals on each channel, different channel for channel, A/D converter to A/D converter. The two spurious signal seems 15 to 20 dB higher than...
    on Jun 4, 2010

  • Forum Post: Re: /DVALID

    Woody Ato
    Hi Tom, Thanks you for your answer, but I think that AND gate wil perfect. The AND will help me to poll the different DVALID (Dvalid 1 & Dvalid 2). what do you think? Thanks Woody
    on Aug 2, 2010

  • Forum Post: /DVALID

    Woody Ato
    I use the DCC18 und I want do a daisy-chain with 2 DDC118. I don't know, if it's possible to connect the two (2) /DVALID together. The Data retrieval must be done for 16 sensor simultaneous. Thanks for any input! Arrah
    on Jul 30, 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

    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: 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: ads1298 biopotential mesurement chip register configuration questions

    josh wojnas
    ads1298 biopotential mesurement chip register configuration questions: I am setting up the regiserts for the ads1298 & I have made a spread sheet of how I think it should be configured for my experaments. Right now I am looking at regiser 4 write register address 4 LOFF 1:0=10 do not...
    on Oct 14, 2010

  • Forum Post: Bipolar analog supply design problem for ADS1258

    Xu Linfeng
    In our application, the analog inputs are within the -2.5V to +2.5V range. Analog supply +15V, +5V and -15V can be used for the ADC. How to get bipolar ±2.5V supply and reference voltage from the power supply? Industrial (–40°C/105°C) temperature range and low power are required...
    on Oct 13, 2010

  • Forum Post: Timing issue with serial flash programming of MSC1211

    Lee Xie
    Hi, folks, In our system, we use serial flash programming to load firmware hex records into a MSC1211 processor . Is there a timing limitation over the serial upgrade procedure, like baud rate, delay between bytes and delay between hex records? many thanks, Lee
    on Nov 30, 2010

  • Forum Post: Offset Errors and Resolution for Delta-Sigma ADC (16-bit ADS1110)

    Leon Rasberry
    I have several questions on the TI ADS1110 ADC: (1) I am trying to determine if negative offset readings for a single channel are typical for the ADS1110 ADC device. The data in Decimal for 5 channels (starting with 1 in our numbering) is given below: Chan1 Chan2 Chan3 Chan4 Chan5 14968 00015...
    on Jan 4, 2011

  • Forum Post: ADS1256 Crystal oscilator start-up problems

    Josko Marasovic
    Hello, I'm using the ADS1256 in my design and I have used crystal to generate ADC's clock. I followed recommendations from data sheet and evaluation module for clock generation. I have used 7.68 MHz crystal with same properties and parallel capacitors of 18 pF as like as crystal used in...
    on Jan 17, 2011

  • Forum Post: ADS8332 REF-

    CalvinTai
    On page 11 of the ADS8332 datasheet, it mentioned pin "REF-" should connect to AGND through an individual via on th PCB, while on page 20, it said REF- should not be connected to the AGND pin of the converter, instead the REF- must be connect to ghe analog ground plane with a separate via....
    on Feb 10, 2011

  • Forum Post: TLV1562 VREFM problem

    daisy70473
    TLV1562 datasheet shows VREFM ranges from -0.3V to0.3V when operating free-air temperature,. At the same time , the datasheet says the minimum of VREFM in the recommended operating conditions is AGND +0.9. HOW can I set VREFM??
    on Mar 31, 2011

  • Forum Post: ADS1605EVM how to read values​​?

    youngmuk oh
    Hello. ADS1605 to the TMS320C6713 and experiment with this during the following situations occur can not start. SLAU122A for experiments in the document "Getting the Most From You EVM" ADS1605_configure function, but in the report Program does not go beyond this. Debug is waiting indefinitely...
    on Apr 4, 2011

  • Forum Post: ADS1015 non linear output

    Kalimuthu Chinnasamy
    I'm using ADS1015 in one of my development.I have configured for 2.048 volt reference with single ended analog input. As per design we are dropping the 4-20mA current from a pressure transmitter across a 220 ohm resistor. I have given this current in column E in the following table. A ctual voltage...
    on Apr 21, 2011
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