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STD LMH1251 (YPbPr TO RGB)

License: CC-BY-SA 3.0

Mode: Editors' pick

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Update time: 2021-12-25 08:06:39
Creation time: 2020-06-23 01:20:51
Description
Y Video IN = 0.7 VPP , PBPR Video IN = ±350 mV but wouldn't the input caps block DC making them all 0.7V p-p ? (or well 1V Y inculding sync). Anyway, I wanted to try this on a ColecoVision or a Bally Astrocade. I'm not sure it would work since it's says it supports 480 not 240 or lower. Assuming the sync summing is correct then this would be cheaper than other methods involving op amps and the LM1881 which is nice and all except for the fact there is only RGB out and not YPbPR as well, This could be remedied with another THS7374 on the input section that splits the YPbPr. Keep in mind the outputs from an Astrocade or Colecovision are way above 700mv p-p or even 1v p-p
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ID Name Designator Footprint Quantity
1 LPFON LPFON SJ_2S 1
2 TTL TTL SJ_2S 1
3 10K R26 0603 1
4 74HC1G02GW U2 5-TSSOP, SC-70-5, SOT-353 OR GATE M74VHC1GT32DFT2G 1
5 THS7374IPW U3 TSSOP-14 1
6 0.1u C1,C2,C12,C16,C7,C8,C9 C0603 7
7 0.22u C3,C4,C5 C0603 3
8 0.0047u C6 C0603 1
9 200 R1 R0603 1
10 33 R2,R3,R4 R0603 3
11 PRI PRI LABLED OVAL SOLDER PAD 120X60 MILL 1
12 PBI PBI LABLED OVAL SOLDER PAD 120X60 MILL 1
13 YI YI LABLED OVAL SOLDER PAD 120X60 MILL 1
14 CS CS LABLED OVAL SOLDER PAD 120X60 MILL 1
15 B B LABLED OVAL SOLDER PAD 120X60 MILL 1
16 G G LABLED OVAL SOLDER PAD 120X60 MILL 1
17 R R LABLED OVAL SOLDER PAD 120X60 MILL 1
18 5VI 5VI LABLED OVAL SOLDER PAD 120X60 MILL 1
19 5VO 5VO LABLED OVAL SOLDER PAD 120X60 MILL 1
20 GNDI GNDI LABLED OVAL SOLDER PAD 120X60 MILL 1
21 GNDO GNDO LABLED OVAL SOLDER PAD 120X60 MILL 1
22 220uf C13,C14,C15 C1411 WITH JUMPER 3
23 75 R5,R6,R7,R23,R24,R25 R0603 6
24 10k R11 R0603 1
25 100 R12,R13,R14,R15,R16,R17,R19,R20,R21 R0603 9
26 1k R18,R8,R9 R0603 3
27 3.6M R10,R27,R28 R0603 3
28 10U C10,C11 C0805 2
29 LMH1251MT U1 TSSOP-24 1

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