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MSP430I2020: The Fastest conversion speed and Highest resolution in SD24 and SD16

Part Number: MSP430I2020
Other Parts Discussed in Thread: MSP430F2003,

Hello.

I have three questions

1.Could you tell me following values when configuration is the fastest conversion speed in SD24 and SD16 ?

・conversion speed

・resolution that can be used

・current consumption(if possible)

2.Could you tell me following values when configuration is the highest resolution that can be used in SD24 and SD16 ?

・conversion speed

・resolution that can be used

・current consumption(if possible)

3.Are there devices which can realize 16bit that can be used and 1kSPS in MSP430 ?

  If answer is "No",would you tell me resolution value that can be used when SD24 and SD16 is configured at 1kSPS.

Incidentally, I am going to use MSP430F2003 and MSP430I2020.

Regards,

uchida-k

  • Hello uchida-k,

    The SD24 has a fixed 1.024 MHz modulator input frequency (fM). For fastest conversion speed the SD24OSRx = 32 and a conversion takes 31.25 us (32/1024000). For highest resolution the SD24OSRx = 256 and LSBACC toggles and two conversions must be sampled so a complete conversion takes 500 us (512/1024000). Typical current consumption is 190 uA typically, 250 uA maximum.

    The SD16 modulation frequency (fSD16) is typically 1 MHz but can get up to 1.1 MHz. Fastest conversion speeds are identical to the SD24, but the SD16OSR can be set to 1024 so it takes 1 ms for a full high-resolution conversion (2048/1024000). Current consumption ranges from 720 up to a maximum of 1850 uA depending on fSD16, SD16LP, SD16OSR, and GAIN.

    For 16-bit resolution you can use either peripheral with OSR=64 and LSBACC = 0 (throw away 1 or 2 LSBs) for 16 kSPS (1024000/64).

    Regards,
    Ryan