SPI bus problems with PIC microcontroller

Hello All,

I am using PIC18F6410 and interfacing it to Linear technology's
LTC2704 ( 16 bit DAC ).

I am checking the data signals on the SDO pin ( MOSI pin of the SPI
bus ) using a USB based Logic Analyzer.

When the pins of the Logic Analyzer are attached to the SDO pin, the
DAC is able to recognise the SPI command and acts accordingly, but
when I remove the logic analyzer connections, the DAC doesn't
recognise the SPI commands and acts like it is dead.

The voltage ouput on the pins of this logic analyser is about 1.157V
( between logic analyser pin and its GND pin).

Is there any fuse setting I am missing ? Is there any clock speeds
that I need to look into. I am running the PIC microcontroller at
20Mhz at present. Please help.

Thanks,

Sandeep

.

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