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ADS1247
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  • Forum Post: Some Problems about ADS1247 program

    He Winston
    Hi I think there are some problems about my ads1247 program. I write to the chip's registers, but when i try to read back from them, all i get is zeros. can anyone give me a code sample about ADS1247 or ADS1248 communication with spi by C?My Email:qsyx@163.com. Thanks! The main program: int...
    on Oct 21, 2009

  • Forum Post: Re: ADS1248 RTD 2 Channels

    Joseph Wu
    Jae Kwon, The way you describe the connections are correct and is similar to Figure 65 in the datasheet. You could use AIN0-AIN1 for the first RTD and AIN2-AIN3 for the second. The IDACs would then be routed to each channel for the measurement. However, you could simplify your system by using the same...
    on Nov 19, 2009

  • Forum Post: Re: ADS1248 RTD 2 Channels

    jae kwon
    Thank you. It makes perfect sense. As another question, Figure 65 in the datasheet says the below. "The resistance of the PT-100 changes from 100Ω at 0°C to 119.6Ω at +50°C. The compensating resistor (RCOMP) has been chosen to be equal to the resistance of the PT-100 sensor...
    on Nov 20, 2009

  • Forum Post: Re: ADS1248 RTD 2 Channels

    Joseph Wu
    You are correct, the compensating resistor is not necessary. It can be used to cancel out the voltage of the RTD so that at a known temperature, the measured voltage is 0V. The one benefit that this has is that the ADC is able to measure a smaller signal. In this case, if you decide to use the PGA...
    on Nov 20, 2009

  • Forum Post: ADS1247's result is unstable!

    He Winston
    I have connect the ads1247 as the following picture. The AIN0 and AIN1 node is connected,but when I read the result.8 bit of the result is unstable. Result:000022 000015 FFFFFD 00004B 00002F 00004A 00006C 00000B 00002B 00004B 000061 000037 000008 00000D 000012 FFFFF9 FFFFF7 00001F 000038 FFFFFE 000053...
    on Dec 3, 2009

  • Forum Post: Re: ADS1247's result is unstable!

    Rick Downs - WEBENCH Design Center
    What data rate and PGA gain are you using? This may be normal performance depending upon these conditions - you have a 118 code variation peak-to-peak, which is an ENOB of 19.03 bits. Check the datasheet and compare the noise listed under your data rate and PGA conditions and see if this ENOB is out...
    on Dec 3, 2009

  • Forum Post: Re: ADS1247's result is unstable!

    Joseph Wu
    While the noise larger than you expect, there are a few things that you can look at to lower the noise. The first thing I noticed is that you use a boost converter for the supply. Since most of these DC/DC converters are noisy and can create spikes on the supplies, you want to be careful using them....
    on Dec 7, 2009

  • Forum Post: Re: ADS1247's result is unstable!

    He Winston
    Thanks for your help! I have used a 5V battery instead of DC/DC converters.The variation of result become smaller significantly.By the way,I use a internal reference of ADS1247.The internal reference voltage is 2.048V. I want to ADS1247 to measure strain gauge,the signal is quite small.The full scale...
    on Dec 10, 2009

  • Forum Post: Re: interface PT100 with ADS1247

    Joseph Wu
    Sunny, Here's what I would do: First, make sure that you can correctly read from and write to the part. Power up the part (or perform a reset) and make sure that you can read all the registers. The reset values are given on the right side of each of the tables showing the registers in the ADS1247...
    on Dec 11, 2009

  • Forum Post: Re: interface PT100 with ADS1247

    Joseph Wu
    Sunny, First, I would check to make sure everything is hooked up correctly. Measure the voltage across RBIAS and make sure that the IDAC currents are going through the reference resistor. Also set the multimeter to measure current and measure current from AIN0 to GND, and AIN1 to GND. With the...
    on Dec 14, 2009

  • Forum Post: Re: interface PT100 with ADS1247

    Joseph Wu
    Since this is likely a setup issue, read through all registers in your setup and post them here. I'll have a look at them then. In the mean time let's make sure that the part isn't damaged in some way. Try setting it up with the internal reference, and go to the MUXCAL and set it to 03h...
    on Dec 15, 2009

  • Forum Post: Re: interface PT100 with ADS1247

    Joseph Wu
    Sunny, At first glance, I don't see anything wrong with the register settings. I'll contact you directly for more infomation. Joseph Wu
    on Dec 16, 2009

  • Forum Post: Re: How to easily read K-type themocouple temperature?

    Joseph Wu
    Eric, I'm pretty sure that we don't have a drop-in replacement for the MAX6675. It may have some linearization circuitry that allows for that performance through the entire output range. However, it is only a 12-bit part, and it gives a maximum error specification without too much guidance...
    on Mar 22, 2010

  • Forum Post: General question offset Shifting with the ADS1248

    Inspiron
    I have a general, I think very easy question concerning ADS1248 analog frontend. I want to use the ADC on a Wheatstone Bridge. The configuration should be as follow: AVDD = 5V, DVDD = 3V, AVSS = 0V Sensor Supply AVDD Differential Measure Voltage Reference Extern (Voltage Divider on AVDD): 2.5V PGA 128...
    on Mar 29, 2010

  • Forum Post: ADC1246/7/8 clock source

    Marco Ciambottini
    Hello, Have anyone used one of the converters above with both the clock options? Are there differences about the ADC precision between the two operating modes? If yes, which is recommendable?? Thanks, Marco
    on Sep 16, 2010

  • Forum Post: Re: ADC1246/7/8 clock source

    Bob Benjamin
    Marco, There was some initial testing with the EVM using an external clock, but we did not see any significant difference. We left the provision for an oscillator on the EVM for customer testing purposes. We are able to achieve excellent datasheet performance using the internal clock. Having said...
    on Sep 16, 2010

  • Forum Post: Re: ADS1148 Thermistor Hook Up

    Bob Benjamin
    Terry, Here is one possibility. IDAC current is driven through each thermistor via the AINx inputs (current flows out), and the voltage is measured across the thermistor. R7 is needed to make sure the voltage measurement stays within the common mode input range of the ADS1148. Size of the resistor...
    on Sep 16, 2010

  • Forum Post: Re: ADS1247 with 3-wire RTD

    Bob Benjamin
    Styg, See my comments below. Best regards, Bob B styg Hello, I intend to use the ads1247 in a project with 3-wire RTD to measure temperature from 0 to 500 ° C. I want to use as reference voltage, the Rbias between pins and REFP Refn, the issue of noise. Some questions: 1 - I have...
    on Sep 30, 2010

  • Forum Post: Re: ADS1247 with 3-wire RTD

    Bob Benjamin
    Styg, The ADC input is differential. This allows you to take a measurement where the result is two's complement. This means that with a Gain of 8 and Vref of 2.4, one LSB is Vref/Gain/(2^23 - 1), which equates to about 36 nV. The actual range is +/- 300mV (+/- Vref/Gain). If you choose to use...
    on Sep 30, 2010

  • Forum Post: Re: ADS1247 SPI

    Bob Benjamin
    Styg, Review Table26 on page 49 of the datasheet. You must write commands that tell the ADS1247 which operations you want to perform. You need to make sure your array values are correct. For example, your write command is incorrect. A write starts with a 0x4x followed by the byte representation with...
    on Nov 25, 2010

  • Forum Post: Re: ADS1247 SPI

    Bob Benjamin
    Styg, Thanks for all the pictures. As per datasheet page 51, " The SDATAC command takes effect after the next DRDY." I think what you are seeing is data in the output register. Try a delay between the SDATAC command and the read register command to make sure that the SDATAC command has been...
    on Nov 26, 2010

  • Forum Post: Re: ADS1247 SPI

    Bob Benjamin
    Styg, So in the function dl600_read_ads1247 unsigned int (void), the variable is 'reading' that is returned, but the value is saved to 'read'. I don't think that operation is correct anyway as I believe that those values need to be summed. Also, you never restart conversions...
    on Dec 2, 2010

  • Forum Post: Re: ADS1247 SPI

    Bob Benjamin
    Styg, If there isn't a challenge where would the fun be? Or sense of accomplishment? One thing that I neglected to tell you in the last post is the output code is binary two's complement. That means that 'read' (which is still defined as 'reading' in your code and you need...
    on Dec 6, 2010

  • Forum Post: Temperature drift

    Sunny Zhang
    I used the ADS1232 and PT100 to measure the temperature. Require the precision of the temperature is 0.01℃. I found the temperature drift is too bad. almost 0.01/℃。 What can I do to solve this problem. if I use the ads1247 instead of ADS1232. where can i get the perfect interface between the PT100...
    on Dec 7, 2010

  • Forum Post: Re: Temperature drift

    Bob Benjamin
    Sunny, The ADS1247 is a better choice of devices for doing temperature measurement. In either case you should use a ratiometric method of measurement to reduce drift issues. In the datasheet for the ADS1247 page 57, Figure 82 you will see an application of the device using a RTD. A precision reference...
    on Dec 7, 2010
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