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THS1007 SYNC -- HAVE I MISREAD DATA SHEET? -- WHAT IS WRONG?

Other Parts Discussed in Thread: THS1007


Me: Michael Randall 16Prescott@earthlink.net (USA)617-407-4244


Product: TI ADC THS1007

Connections:

01 D0 32 A1 (2.5 -> 2.9v)
02 D1 31 A2 (2.5 -> 2.9v)
03 D2 30 A3 (2.5 -> 2.9v)
04 D3 29 A4=2.5v
05 D4 28 REFIN \ 10uF -> G
06 D5 27 REFOUT /
07 Vdd 10uF -> G 26 REFP=NC
08 G 25 REFM=NC
09 D6 24 G
10 D7 23 Vdd 10uF -> G
11 D8 22 /CS0=G
12 D9 21 CS1=Vdd
13 RA0 20 R/W
14 RA1=G 19 /RD=Vdd
15 CLK 18 Vdd 10uF -> G
16 SYNC 17 G


Control Register Settings:

9 8 7 6 5 4 3 2 1 0
CR0: 0 0 1 0 0 1 0 0 0 0
CR1: 0 0 1 1 0 0 0 0 1 0


Expected Behaviour of SYNC:

H H H H H H
L L L


Observed Behaviour of SYNC:

H H H H H H H HHHHHHHHHHHHHHHHH H H H H H H H HHHHHHHHHHHHHHHHH
L L L L L L L L L L L L L L L L

  • =============================================

    Sorry that the act of posting this yesterday

    destroyed the main part of what I am having trouble with. 

    Here is an attempt to repair the damage . . .

    ==============================================

    Michael Randall said:


    Me: Michael Randall 16Prescott@earthlink.net (USA)617-407-4244


    Product: TI ADC THS1007

    Connections:

    01 D0 .....................32 A1 (2.5 -> 2.9v)
    02 D1 .....................31 A2 (2.5 -> 2.9v)
    03 D2 .....................30 A3 (2.5 -> 2.9v)
    04 D3 .....................29 A4=2.5v
    05 D4 .....................28 REFIN \ 10uF -> G
    06 D5 .....................27 REFOUT /
    07 Vdd 10uF -> G 26 REFP=NC
    08 G .......................25 REFM=NC
    09 D6 .....................24 G
    10 D7 .....................23 Vdd 10uF -> G
    11 D8 .....................22 /CS0=G
    12 D9 .....................21 CS1=Vdd
    13 RA0 ...................20 R/W
    14 RA1=G ..............19 /RD=Vdd
    15 CLK ...................18 Vdd 10uF -> G
    16 SYNC ................17 G


    Control Register Settings:

    --------9 8 7 6 5 4 3 2 1 0
    CR0: 0 0 1 0 0 1 0 0 0 0
    CR1: 0 0 1 1 0 0 0 0 1 0


    Expected Behaviour of SYNC: 

    =======================

    L-H-H

    L-H-H . . .

    Observed Behaviour of SYNC:

    ========================

    L-H-L-H-L-H-L-H-L-H-L-H-L-H-L-H-H-H-H-H-H-H-H-H-H-H-H-H-H-H-H-H-H

    L-H-L-H-L-H-L-H-L-H-L-H-L-H-L-H-H-H-H-H-H-H-H-H-H-H-H-H-H-H-H-H-H . . .