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TLA2528: What is the Max Sample Rate?

WorkerBee
Prodigy 190 points
Part Number: TLA2528
Other Parts Discussed in Thread: TLA2518

Tool/software:

The data sheet Indicates 1000ksps, but the website says 140ksps. 

  • 0
    TI__Genius 16450 points

    Hi WorkerBee,

    It should be clarified that the 140ksps sampling speed is derived from the maximum speed that conversion data can be pushed through an I2C interface. 

    Table 3 from the datasheet does not refer to the effective rate that an MCU will be able to collect samples from the TLA2528. It only applies to internally generated conversions using the device's internal oscillator for conversion. For this device, this means the averaging module. So one conversion might be done internally in 1us, but it takes more time for the full conversion to be read with an MCU because of the speed specifications/limitations of I2C. The conversion will be ready, but you can't "use" it until the full conversion data is sent on the I2C bus, so it is only specified for the maximum usable speed.

    If faster effective sampling rates are required, a device with a SPI interface would be more suitable. The TLA2518 specifically is the SPI version of this device that achieves a full 1MSPS throughput.

    I hope that makes sense, but let me know if I can clarify further.

    Regards,
    Joel