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tapping differential outputs
tapping differential outputs
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Old 8th July 2010, 02:43 AM   #1
belgiangenius is offline belgiangenius  Canada
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Default tapping differential outputs

I'm working on a DAC chip with differential outputs.

I've accidentally lifted L+ and R- pads from the circuit board.

Is there any reason I can't use L- and R+ outputs? Would this result in throwing the speakers out of phase?
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Old 8th July 2010, 06:03 AM   #2
Calvin is offline Calvin  Germany
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Hi,

it depends on the topology of the current sources within the DAC.
But most current steering DACs I know must have their outputs connected to a low-impedance current path. For example You could use a single DAC-output of the PCM1794A (and alikes) if You connect the inverted partner output to gnd.

jauu
Calvin
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Old 8th July 2010, 01:07 PM   #3
belgiangenius is offline belgiangenius  Canada
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This is a CS4397 that has voltage source outputs.
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Old 8th July 2010, 02:30 PM   #4
Bill Fuss is offline Bill Fuss  United States
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Yes, your speakers will be 180 degrees out of phase.
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Old 8th July 2010, 07:25 PM   #5
belgiangenius is offline belgiangenius  Canada
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Managed to tap the L- and R- pins right on the chip.

I need to stop screwing with this DAC.
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