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The DC Reference modul
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dvb projekt

diyAudio Member

Registered: February 2009
Location: Willich, Germany
Posts: 1,481
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Because the Grounded-Gate Buffer is connected between the DAC output and the passive I/V resistor,
normally the I/V resistor is connected between the DAC output and GND,
you must get rid off the approx. 4V DC on each I/V resistor.
Therefore we must get a new reference GND for each channel.

The circuit is connected to the ref.+5V at the output of the buffer and GND,
with a decoupling cap for each channel.
By trimming each voltage so it exactly matches DC voltage on the I/V resistor,
the DC voltage between I/V resistor and reference becomes zero.
In other words, the DC component is removed without using a coupling cap.
Date: Mon August 22, 2011

Additional Info
Additional Categories: "Reference" TDA1541A DAC project with I2S-BUS architecture
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