ADS8363 Psuedo-mode Multiplexing

Bradley Higgin

Other Parts Discussed in Thread: ADS8363

I'm trying to confirm some odd behavior with the ADS8363. To select the next conversion channel, I’m setting the multiplexer channel selection bits to the following:

Channel0 : C[1:0]=01
Channel1 : C[1:0]=10
Channel2 : C[1:0]=11
Channel3 : C[1:0]=00

Intuitively, I would have expected:
Channel0 : C[1:0]=00
Channel1 : C[1:0]=01
Channel2 : C[1:0]=10
Channel3 : C[1:0]=11

Below are are my settings:

M[1:0] = 00
CONFIG = 0x0040
REFDAC1 = 0x03FF
REFDAC2 = 0x07FF
SEQFIFO = 0x0000
REFCM = 0xFF00

I can provide scope captures if needed.

Thanks in advance,

Brad

over 14 years ago

Tom Hendrick over 14 years ago

TI__Guru**** 183241 points

Hi Brad,

I believe you've been working with Naser here. Can you please define your interpretation of CH0 through CH1 for us? The ADS8363 operates in channel pairs, A0, B0 and A1, B1; we'd like to try and confirm what you see by the actual channel name.

Bradley Higgin over 14 years ago in reply to Tom Hendrick

Intellectual 535 points

Tom,

I was defining CH[3:0] as A[3:0] and B[3:0] in parallel (M[1:0] = 00).

CONV: N-1 N N+1 N+2 N+3

C[1:0]: <01> <10> <11> <00>

SDOA: <AX> <A0> <A1> <A2> <A3>

SDOB: <BX> <A0> <B1> <B2> <B3>

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ADS8363 Psuedo-mode Multiplexing