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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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In Reply to: RE: "More DACs"..... posted by 13th Duke of Wymbourne on July 14, 2015 at 21:43:24:
According to ESS 'specs' the Sabre chip can output in either current or voltage mode depending on the configuration.
From the Spec Sheet:
The default configuration ,in eight channel mode, is that a pair of six bit DACs operating in anti-phase make up each channel. Since the DACs are as described, namely a Thevenin equivalent to a voltage source linearly between AGnd and AVcc having an approximately 800Ω output impedance, you
may choose to connect this output to a voltage mode (non-inverting amplifier) configuration; or you may choose to connect it to a virtual g
round current mode (inverting amplifier) configuration. The highest performance in terms of THD is via the current mode16, but both voltage and current mode provide aboutthe same DNR.
The default configuration for Stereo mode, and the only
configuration that can use the SPDIF input, is to wire four
output channels in parallel. When Stereo mode is enabled in
the configuration registers the same data is sent to all four
channels. Effectively now the DACs become a pair of eight bit
DACs having an output impedance of about 200Ω. This configuration allows
>132dB of DNR to be typically reached. THD in the Stereo current mode is limited by the external components and measurement equipment. We
recommend using an extremely good op-amp for the highest performance but even an excellent op-amp is the limiting factor in the THD.
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Follow Ups
- RE: "More DACs"..... - Dynobot 23:46:22 07/14/15 (0)
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