tapping differential outputs

belgiangenius · 8th July 2010, 02:43 AM

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?

Calvin · 8th July 2010, 06:03 AM

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

belgiangenius · 8th July 2010, 01:07 PM

This is a CS4397 that has voltage source outputs.

Bill Fuss · 8th July 2010, 02:30 PM

Yes, your speakers will be 180 degrees out of phase.

belgiangenius · 8th July 2010, 07:25 PM

Managed to tap the L- and R- pins right on the chip.

I need to stop screwing with this DAC.

8th July 2010, 02:43 AM	#1
belgiangenius diyAudio Member Join Date: Apr 2010	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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8th July 2010, 06:03 AM	#2
Calvin diyAudio Member Join Date: Nov 2004 Location: close to Basel	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

8th July 2010, 01:07 PM	#3
belgiangenius diyAudio Member Join Date: Apr 2010	This is a CS4397 that has voltage source outputs.

8th July 2010, 02:30 PM	#4
Bill Fuss RIP Join Date: Oct 2005 Location: Central Florida	Yes, your speakers will be 180 degrees out of phase.

8th July 2010, 07:25 PM	#5
belgiangenius diyAudio Member Join Date: Apr 2010	Managed to tap the L- and R- pins right on the chip. I need to stop screwing with this DAC.

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