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thejpsterthejpster
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Merge branch 'feature/vga-dac' into develop
2 parents 7bb62d4 + 0ba6246 commit 1fffceb

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‎Kicad/Neotron-Common-Hardware.sch‎

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‎Kicad/audio.sch‎

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‎Kicad/dac.sch‎

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EESchema Schematic File Version 4
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EELAYER 30 0
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EELAYER END
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$Descr A4 11693 8268
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encoding utf-8
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Sheet 3 12
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Title "Neotron Common Hardware - VGA DAC"
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Date "2021-01-01"
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Rev "[Uncontrolled]"
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Comp "https://neotron-compute.github.io/"
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Comment1 "Licenced as CC BY-SA"
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Comment2 "Copyright (c) The Neotron Developers, 2021"
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Comment3 ""
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Comment4 ""
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$EndDescr
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AR Path="/5F5A2FEF/5F5F38E0/5F5FD6C1" Ref="R?" Part="1"
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AR Path="/5F5A2FEF/5F5F39AF/5F5FD6C1" Ref="R?" Part="1"
363+
AR Path="/5F5A2FEF/5F5F3907/5F5FD6C1" Ref="R?" Part="1"
364+
AR Path="/5FDE658D/5FEFB226/5F5FD6C1" Ref="R306" Part="1"
365+
AR Path="/5FDE658D/5FF0831A/5F5FD6C1" Ref="R?" Part="1"
366+
AR Path="/5FDE658D/5FF0DF5F/5F5FD6C1" Ref="R?" Part="1"
367+
AR Path="/5FDE658D/6009CBAC/5F5FD6C1" Ref="R406" Part="1"
368+
AR Path="/5FDE658D/600A04B7/5F5FD6C1" Ref="R506" Part="1"
369+
F 0 "R306" H 8570 2746 50 0000 L CNN
370+
F 1 "24k 0.1%" H 8570 2655 50 0000 L CNN
371+
F 2 "Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder" V 8430 2700 50 0001 C CNN
372+
F 3 "~" H 8500 2700 50 0001 C CNN
373+
1 8500 2700
374+
1 0 0 -1
375+
$EndComp
376+
Text Notes 4500 4200 0 50 ~ 0
377+
6-bit R2R DAC\n3.3V * 63 / 64 = 3.2484375 V\nBuffer Input = 3.2484375 V * R / (12k + R) = 700 mV\n=> R = 3296 ohm\nBuffer Input Impedance = 800k\nR = 800k || R_OUT\n=> R_OUT = 3310 Ohm\n\nDIGITAL_IN[0] is the least significant bit\nDIGITAL_IN[5] is the most significant bit\n
378+
Text Label 3500 2400 0 50 ~ 0
379+
DIGITAL_IN0
380+
Text Label 4500 2400 0 50 ~ 0
381+
DIGITAL_IN1
382+
Text Label 5500 2400 0 50 ~ 0
383+
DIGITAL_IN2
384+
Text Label 6500 2400 0 50 ~ 0
385+
DIGITAL_IN3
386+
Text Label 7500 2400 0 50 ~ 0
387+
DIGITAL_IN4
388+
Text Label 8500 2400 0 50 ~ 0
389+
DIGITAL_IN5
390+
Text Label 2425 2000 0 50 ~ 0
391+
DIGITAL_IN[0..5]
392+
Wire Wire Line
393+
3500 2100 3500 2550
394+
Entry Wire Line
395+
3400 2000 3500 2100
396+
Wire Bus Line
397+
2200 2000 8400 2000
398+
$EndSCHEMATC

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