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ADS1294R: Question about Pacemaker function

Chase Jeong
Genius 5010 points
Part Number: ADS1294R
Other Parts Discussed in Thread: ADS1293, OPA320, ADS7042, ADS1294

Hello TI experts,

My customer considers ADS1294R for their new product, they have a question about Pacemaker function.

they used ADS1293 for their previous product, they did not have any problems about it.

but ADS1294R seems that it needs external Op amp and ADC, according to figure 103 in the datasheet. (OPA320, ADS7042, and external microcontroller)

my customer wants to know that these 2 parts are necessary for using Pacemaker function.

they said that ADS1294R has PACEOUT pin, but it does not have AD conversion block inside so they need external circuit.

(as you know, it is essential for patient monitor, IEC 60601-2-27 standard.)

it would be good if it does not need any additional components or minimum number of components.

please check this issue. Thanks.

Best regards,

Chase

  • +1
    TI__Genius 11550 points

    Hi Chase,

    Thanks for the support.

    The ADS1294 offers the flexibility for pace detection by using either software (internal ADC) or external hardware. There is some design tradeoff between the software and hardware approach. The internal ADC (max 32 kSPS) is capable of capturing the pace pulse for processing. However, the data rate setting on the ADS129x is global for all channels. For certain ECG applications, operating the device at higher speed for both PACE and ECG signals may be undesirable. Hence, we offer the PACEOUT signals from the ADS129x to be used with external hardware design. For more detailed information on the software and hardware pace detection implementation, please refer to section 9.3.1.7.7 in the datasheet.

    I have attached some of the reference designs below using the PACEOUT signal from the ADS129x device for your reference.

    TIPD197
    Reference Design for Software Pacemaker Detection in an ECG

    TIDA-010005
    Software-Configurable Cardiac Pacemaker Detection Module Reference Design

    SLAU511
    Hardware Pace Detection for ECG Reference Design

    Thanks

    -TC

  • 0 in reply to TCT
    Genius 5010 points

    Dear TC,

    Thank you for your support.

    my customer considers software approach for pacemaker detection. and I have one more question,

     - Can I use maximum 32kSPS for all channels? or is there any different limitations for each channel or total channels?

    for example) I can use 32kSPS for channel 1 but 24kSPS for channel 2 <or> I can use 32kSPS if I use one channel / but only can use 16kSPS if I use 2 channels.

     please check this issue. Thanks.

    Best regards,

    Chase

  • +1 in reply to Chase Jeong
    TI__Genius 11550 points

    Hi Chase,

    Yes, all channels can be operate at 32 kSPS simultaneously. The data rate setting is global for all channels so if you operate the device at 32 kSPS, all the channels will be set to 32 kSPS. It is not possible to use different data rates for different channels.

    Thanks

    -TC

  • 0 in reply to TCT
    Genius 5010 points

    Dear TC,

    Thank you for your support. I will discuss it with my customer, and post another thread if I have more questions.

    Best regards,

    Chase