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--- audio:audio_by_van_alstine_work [2019/05/22 04:29] – [Vision DAC improved] mithat
+++ audio:audio_by_van_alstine_work [2019/05/22 04:41] – [DAC MK5] mithat
@@ Line 121: / Line 121: @@
 **Discussion:** Phew! With the Vision DAC incapable of effectively supporting newer in-demand digital audio formats, AVA asked me to design for them a product that would. The original design brief specified support for up to 192kHz PCM sample rates and DSD64. I insisted on a design that provided support for DSD128 as well and that had the infrastructure to support DSD256 once that format matured. (AVA released official support for DSD256 in 2018.)
-Working closely with application engineers at AKM, I was able to develop support circuitry for the AK4490EQ that provided improved low-frequency reference voltage stability; this in turn reduced the low frequency nonlinearity appreciably over more conventional approaches.
+Working with application engineers at AKM, I developed support circuitry for the AK4490EQ whose low-frequency reference voltage stability was significantly greater than the circuits used in AK4490EQ reference designs. This in turn reduced the low frequency nonlinearity of the DAC appreciably over more conventional approaches.
-This would be the first time AVA would use in-house burned microcontrollers --- and it did so in a big way: I ended up using three independent microcontrollers in the final product, one for each of the DAC’s core functions: input selection and control, DAC control, and the user interface. Also notable in this design is the scale to which SMD technology was adopted and the high level of build integration. These required introducing significant changes to AVA’s manufacturing workflow, but this has brought AVA’s production methods more in line with modern approaches.
+This would be the first design that required AVA to use microcontrollers they would burn in-house --- and it did so in a big way: I ended up using three independent microcontrollers in the final product, one for each of the DAC’s core functions: input selection and control, DAC control, and the user interface. Also notable in this design is the scale to which SMD technology was adopted and the high level of build integration. These required introducing significant changes to AVA’s manufacturing workflow, which in turn has brought AVA’s production methods more in line with modern approaches.
 ===== Vision SLR, Fet Valve CFR =====