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Dev board (in some cases) Arduino + DAC https://www.youtube.com/watch?v=t3kUPjdiq0o for explainer https://drive.google.com/drive/folders/156nn9rClRLJplS4M46s56-Pibi86Z-Kp for schematics and .ino file uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ 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 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 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 0.8mm; http://ww1.microchip.com/downloads/en/PackagingSpec/00000049BQ.pdf#p495 TFBGA-216, 15x15 raster, 10x10mm package, 0.5mm pitch; https://www.xilinx.com/support/documentation/user_guides/ug475_7Series_Pkg_Pinout.pdf#page=266, NSMD pad definition Appendix A BGA 1760 1 FF1761 FFG1761 Virtex-7 BGA, 42x42 grid, 45x45mm package, 1mm pitch; https://www.xilinx.com/support/documentation/user_guides/ug475_7Series_Pkg_Pinout.pdf#page=294, https://www.xilinx.com/support/documentation/user_guides/ug865-Zynq-7000-Pkg-Pinout.pdf#page=90, NSMD pad definition (http://www.ti.com/lit/ds/symlink/lm4990.pdf, http://www.ti.com/lit/an/snva009ag/snva009ag.pdf Texas Instruments, DSBGA, 1.4715x1.4715mm, 9 bump 3x3 array, NSMD pad definition Appendix A BGA 1760 1 FH1761 FHG1761 Virtex-7 BGA, 34x34 grid, 35x35mm package, 1mm pitch; https://www.xilinx.com/support/documentation/user_guides/ug475_7Series_Pkg_Pinout.pdf#page=277, https://www.xilinx.com/support/documentation/user_guides/ug475_7Series_Pkg_Pinout.pdf#page=296, https://www.xilinx.com/support/documentation/user_guides/ug865-Zynq-7000-Pkg-Pinout.pdf#page=91, NSMD pad definition (http://www.ti.com/lit/ds/slas718g/slas718g.pdf, http://www.ti.com/lit/an/snva009ag/snva009ag.pdf Texas Instruments, DSBGA, 3.415x3.535x0.625mm, 64 ball 8x8 area grid, YZR pad definition (http://www.ti.com/lit/ds/symlink/lmc555.pdf, http://www.ti.com/lit/an/snva009ag/snva009ag.pdf Texas Instruments, DSBGA, area grid, YBJ0008 pad definition, 0.704x1.054mm, 6 Ball, 2x3 Layout, 0.4mm Pitch, https://www.st.com/resource/en/datasheet/stm32u575og.pdf#page=306 ST WLCSP-100, off-center ball grid, ST die ID 456, 1.94x2.4mm, 20 Ball, 4x5 Layout, 0.4mm Pitch, https://pdfserv.maximintegrated.com/package_dwgs/21-100168.PDF XBGA-121, 11x11 raster, 10x10mm package, pitch 0.4mm; see section 7.2 of http://www.st.com/resource/en/datasheet/stm32f429ng.pdf WLCSP-143, 11x13 raster, 4.521x5.547mm package, pitch 0.4mm; see section 7.1 of http://www.st.com/resource/en/datasheet/stm32f411vc.pdf WLCSP-49, 7x7 raster, 2.999x3.185mm package, pitch 0.35mm; https://datasheets.maximintegrated.com/en/ds/MAX40200.pdf WLP-9, 1.448x1.468mm, 9 Ball, 3x3 Layout, 0.4mm Pitch, https://www.st.com/resource/en/datasheet/stm32l562ce.pdf ST WLCSP-90, ST die ID 471, 4.437x4.456mm, 100 Ball, 10x10 Layout, 0.4mm Pitch, https://assets.nexperia.com/documents/data-sheet/PCMFXUSB3S_SER.pdf ST WLCSP-18, ST Die ID 466, 1.86x2.14mm, 18 Ball, X-staggered 7x5 Layout, 0.4mm Pitch, https://assets.nexperia.com/documents/data-sheet/PCMFXUSB3S_SER.pdf ST WLCSP-18, ST Die ID 466.

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