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Sigma delta with PGA input?

Yasuhiko OKADA
Expert 1900 points
Other Parts Discussed in Thread: MSP430F478, MSP430F47173

I am confused about several Sigma Delta modules.
Especially, I am not sure about the followings.

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MSP430F478 - 16-bit Sigma Delta (Five Differential Analog Inputs)

http://focus.ti.com/docs/prod/folders/print/msp430f478.html


MSP430F47173 - 16-bit Sigma Delta (Differential PGA Inputs)

http://focus.ti.com/docs/prod/folders/print/msp430f47173.html

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Does the "PGA Input" mean that one SD16_A(or SD16) has some multiple
inputs (not only 1 channel) through the PGA? For example, 3 16-bit
Sigma delta has 3 * N inputs (N = number of PGA inputs for each module)?

When I need 5 channel analog inputs, can I use only 1 sigma
delta module attached with the PGA inputs?

 

  • 0
    TI__Expert 7845 points

    There's two different things:
    Channel & Differential inputs

    SD16 can have multiple channels & each channel can have multiple differential inputs. For example:
    F478: Has ONLY 1 SD16 channel (per user's guide diagram), but that one channel has 5 different differential analog inputs (per pinout in datasheet: A0 +/-, A1+/-  upto A4+/-).
    F47173: Has 3 SD16 channels (per user's guide diagram), but each channel only has 1 different differential analog input (per pinout in datasheet: A0.0 +/-, A1.0+/-  & A2.0+/-).

    Bottomline is that you have to see the user's guide(block diagram) and datasheet (pinout) to see how many channels & analog inputs does a device have.

  • 0 in reply to Harman
    Expert 1900 points

    Thank you very much, Harman.

     

    Your reply helped me to understand on this topic.

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