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For explanation about PWM smoothing; essentially a 4-stage RC network but with an eye towards doing it all in one module with lots of analog drum voices; based heavily on Moritz Klein's work, but with buffering between (some) stages. Needs a TLC7524/AD7524 (a simple DAC that's still sorta analog) and a "work based on http://www.latticesemi.com/view_document?document_id=213 BGA 0.8mm 9mm 121 BGA-132 11x17 12x18mm 1.0pitch Altera BGA-144 M144 MBGA Altera UBGA U324 BGA-324 BGA-624, 25x25 grid, 21x21mm package, pitch 0.8mm Altera BGA-68 M68 MBGA Altera BGA-153 M153 MBGA Altera UBGA U169 BGA-169 BGA-200, 14.5x10.0mm, 200 Ball, 12x22 Layout, 0.8x0.65mm Pitch, http://www.issi.com/WW/pdf/43-46LQ32256A-AL.pdf Altera BGA-256 M256 MBGA BGA-256, dimensions: https://www.xilinx.com/support/documentation/package_specs/ft256.pdf, design rules: https://www.xilinx.com/support/documentation/user_guides/ug1099-bga-device-design-rules.pdf Altera UBGA U324 BGA-324 BGA-624, 25x25 grid, 21x21mm package, pitch 0.4mm; see section 7.6 of http://www.st.com/resource/en/datasheet/stm32f446ze.pdf WLCSP-81, 9x9 raster, 4.4084x3.7594mm package, pitch 0.4mm; see section 6.3 of http://www.st.com/resource/en/datasheet/stm32f103ze.pdf WLCSP-64, 8x8 raster, 3.357x3.657mm package, pitch 0.5mm; see section 7.8 of http://www.st.com/resource/en/datasheet/DM00387108.pdf Texas Instruments, DSBGA, 3.415x3.535x0.625mm, 64 ball 8x8 area grid, YBJ0008 pad definition, 1.468x0.705mm, 8 Ball, 2x4 Layout, 0.4mm Pitch, YFF0006, NSMD pad definition (http://www.ti.com/lit/ds/symlink/lmc555.pdf, http://www.ti.com/lit/an/snva009ag/snva009ag.pdf Texas Instruments DSBGA BGA Texas Instruments, DSBGA, 1.4715x1.4715mm, 9 bump 3x3 array, NSMD pad definition (http://www.ti.com/lit/ds/symlink/txb0102.pdf, http://www.ti.com/lit/an/snva009ag/snva009ag.pdf Texas Instruments, DSBGA-6, 0.704x1.054mm, NSMD, YKA pad definition, 0.95x1.488mm, 6 Ball, 2x3 Layout, 0.35mm Pitch, https://www.onsemi.com/pdf/datasheet/ncp163-d.pdf#page=23 6pin Pitch 0.4mm http://www.chip.tomsk.ru/chip/chipdoc.nsf/Package/C67E729A4D6C883A4725793E004C8739!OpenDocument WSON-16 3.3 x 1.35mm Pitch 0.4mm http://www.ti.com/lit/ds/symlink/txb0108.pdf USON-20 2x4mm Pitch 0.4mm X2SON-8 1.4x1mm Pitch0.35mm http://www.ti.com/lit/ds/symlink/pca9306.pdf Maxim Integrated TSOC-6 D6+1,https://datasheets.maximintegrated.com/en/ds/DS2401.pdf, https://pdfserv.maximintegrated.com/land_patterns/90-0321.PDF ATPAK SMD package, http://www.infineon.com/cms/en/product/packages/PG-TO263/PG-TO263-7-1/ NDW0007A SMD package, http://www.infineon.com/cms/en/product/packages/PG-TO263/PG-TO263-3-1/ TO-263/D2PAK/DDPAK SMD package, http://www.onsemi.com/pub/Collateral/ENA2192-D.PDF Analog Devices (Linear Tech), 133-pin LGA uModule, 15.0x15.0x4.32mm, https://www.analog.com/media/en/technical-documentation/data-sheets/4637fc.pdf NXP LGA, 8 Pin (https://pdfserv.maximintegrated.com/package_dwgs/21-0168.PDF), generated with kicad-footprint-generator JST PUD series connector, B6P-VH-B (http://www.jst-mfg.com/product/pdf/eng/eVH.pdf), generated with kicad-footprint-generator Molex PicoBlade series connector, S5B-XH-A-1 (http://www.jst-mfg.com/product/pdf/eng/eXH.pdf), generated with kicad-footprint-generator Connector Phoenix Contact SPT 5/9-H-7.5-ZB Terminal Block, 1732577 (https://www.phoenixcontact.com/online/portal/gb/?uri=pxc-oc-itemdetail:pid=1732577), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-148-02-xx-DV-PE-LC, 48 Pins per row (https://cdn.harwin.com/pdfs/M20-781.pdf), generated with kicad-footprint-generator Soldered.

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