• State TI Thinks Resolved
  • Locked Locked
  • Replies 2 replies
  • Answers 1 answer
  • Subscribers 47 subscribers
  • Views 270 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

ADS1296R: How to measure the dynamic range and maximum phase lag of the ADS1296R analog channel

user4189183
Prodigy 70 points
Part Number: ADS1296R
I want to measure the dynamic range and maximum phase lag of the ADS1296R analog channel. Whether the value is fixed or variable.

my question:

1. Is the dynamic range of the 1mV ECG signal 72dB / 12bit? how to measure?
2. Does the maximum phase lag at 6 Hz reach 6 degrees? how to measure?

  • 0
    TI__Guru**** 172266 points

    Hello Poster!

    Our support staff is taking time with their families for the Independence Day holiday here in the US.  It may be July 8th before we can get back to you with help on your query.  We apologize in advance for the delay and will get back to you as soon as possible.

  • 0 in reply to Tom Hendrick
    TI__Guru 60476 points

    Hello,

    The dynamic range of the ADS1296R will depend on the output data rate and the gain settings. These parameters ultimately determine the ADC's noise performance. 

    The dynamic range can be calculated using the input-short noise measurements listed in Tables 1-4 as:

    Dynamic Range (dB) = 20 x log10 (Vn_pp / FSR)

    Effective Resolution (bits) = log2 (Vn_pp / FSR)

    For example, in Table 1, the full-scale range (FSR) is equal to 2xVREF = 4.8 V. With PGA = 12 V/V and Data Rate = 500 SPS, the Dynamic Range is about -124 dB and the effective resolution is about 20.7 bits. Keep in mind that this is based on shorting the inputs of the PGA internally, which removes noise from an external signal source and the ADC reference voltage.

    Regarding the phase delay, the sinc3 digital filter has a linear phase response and will apply the same delay to all input frequencies.

    Best regards,