DS1077 IC output 0 fault

[See_Mos]

Has anyone done anything with the Analog Devices DS1077, in my case a DS1077Z-100

I have output 1 working OK but cannot get 12.5MHz and 100MHz from output 0.  25MHz and 50MHz are OK.

These are the test values that I am using:-

Code Select Expand

' test MUX high byte
'    Dim MUX_High As Byte = %00011000    ' $18 output = 0MHz ?? should be 100MHz
'    Dim MUX_High As Byte = %00011010    ' $1A output = 50MHz
'    Dim MUX_High As byte = %00011100    ' $1C output = 25MHz   
    Dim MUX_High As Byte = %00011110    ' $1E output = 25MHz ?? should be 12.5MHz   
       
    I2COut SDA,SCL,$B0,[$02,MUX_High,$0]

Bits 1 and 2 control the prescaler.  MUX_Low is not used for output 0 so just cleared.

The tolerance is not very good so it is just a challenge to make it work.