power DAC

That's strange. I just reloaded the data sheet from TI and don't see that.

This

I want to close a control loop inside an FPGA. This DAC is fast, and the ADC3910S025 is fast. I could run both at 20 MHz.

John Larkin Highland Tech Glen Canyon Design Center Lunatic Fringe Electronics

"john larkin" snipped-for-privacy@glen--canyon.com wrote in message news: snipped-for-privacy@4ax.com...

This isn't very exciting either but not long ago someone asked me if a 12V 1A linear regulator was possible with the pass transistor's case mounted directly on grounded metal. So I suggested this with a TIP122. This has been changed so that no other files are needed.

Watch out for line wraps and u symbol issues for C5,7,9,10

Version 4.1 SHEET 1 4960 1688 WIRE -304 -160 -400 -160 WIRE -160 -160 -240 -160 WIRE -160 -144 -160 -160 WIRE -112 -144 -160 -144 WIRE 544 -144 -112 -144 WIRE 736 -144 544 -144 WIRE 832 -144 736 -144 WIRE 896 -144 832 -144 WIRE 992 -144 896 -144 WIRE 1056 -144 992 -144 WIRE 1120 -144 1056 -144 WIRE -400 -112 -400 -160 WIRE -304 -112 -400 -112 WIRE -160 -112 -160 -144 WIRE -160 -112 -240 -112 WIRE 544 -80 544 -144 WIRE 736 -80 736 -144 WIRE -704 -64 -832 -64 WIRE -512 -64 -624 -64 WIRE -448 -64 -512 -64 WIRE -400 -64 -400 -112 WIRE -400 -64 -448 -64 WIRE 832 -64 832 -144 WIRE -304 -48 -352 -48 WIRE -160 -48 -160 -112 WIRE -160 -48 -240 -48 WIRE -832 -16 -832 -64 WIRE -704 -16 -704 -64 WIRE -624 -16 -624 -64 WIRE -448 -16 -448 -64 WIRE -352 0 -352 -48 WIRE -304 0 -352 0 WIRE -160 0 -160 -48 WIRE -160 0 -240 0 WIRE 544 32 544 0 WIRE 624 32 544 32 WIRE -112 48 -112 -144 WIRE -352 64 -352 0 WIRE -304 64 -352 64 WIRE -160 64 -240 64 WIRE 736 80 736 0 WIRE 736 80 688 80 WIRE 832 96 832 16 WIRE -832 112 -832 64 WIRE -704 112 -704 64 WIRE -704 112 -832 112 WIRE -624 112 -624 64 WIRE -512 112 -624 112 WIRE -448 112 -448 48 WIRE -448 112 -512 112 WIRE -352 112 -352 64 WIRE -352 112 -448 112 WIRE -304 112 -352 112 WIRE -160 112 -160 64 WIRE -160 112 -240 112 WIRE -400 192 -400 -64 WIRE -304 192 -400 192 WIRE -160 192 -160 112 WIRE -160 192 -240 192 WIRE 896 208 896 -144 WIRE 992 208 992 -144 WIRE 736 224 736 80 WIRE 832 224 832 176 WIRE 832 224 736 224 WIRE 1120 224 1120 -144 WIRE -400 240 -400 192 WIRE -304 240 -400 240 WIRE -160 240 -160 192 WIRE -160 240 -240 240 WIRE -112 240 -112 112 WIRE -112 240 -160 240 WIRE -80 240 -112 240 WIRE -32 240 -80 240 WIRE 16 240 -32 240 WIRE 96 240 16 240 WIRE 240 240 192 240 WIRE 400 240 240 240 WIRE 432 240 400 240 WIRE 624 240 624 128 WIRE 624 240 432 240 WIRE 656 240 624 240 WIRE 736 240 736 224 WIRE 736 240 720 240 WIRE 16 272 16 240 WIRE 400 272 400 240 WIRE 240 288 240 240 WIRE 544 320 544 32 WIRE 544 320 480 320 WIRE -80 336 -80 240 WIRE 16 368 16 336 WIRE 80 368 16 368 WIRE 144 368 144 304 WIRE 144 368 80 368 WIRE 352 384 352 336 WIRE 480 384 480 320 WIRE 16 400 16 368 WIRE 736 400 736 240 WIRE 544 416 544 320 WIRE 304 448 272 448 WIRE 432 448 400 448 WIRE 448 448 448 336 WIRE 448 448 432 448 WIRE -80 528 -80 416 WIRE -32 528 -80 528 WIRE 16 528 16 480 WIRE 16 528 -32 528 WIRE 240 528 240 368 WIRE 240 528 16 528 WIRE 272 528 272 448 WIRE 272 528 240 528 WIRE 320 528 272 528 WIRE 432 528 432 448 WIRE 432 528 400 528 WIRE 480 528 480 448 WIRE 480 528 432 528 WIRE 544 528 544 480 WIRE 544 528 480 528 WIRE 736 528 736 480 WIRE 736 528 544 528 WIRE 896 528 896 272 WIRE 896 528 736 528 WIRE 992 528 992 272 WIRE 992 528 896 528 WIRE 1120 528 1120 304 WIRE 1120 528 992 528 WIRE 1120 560 1120 528 FLAG 1120 560 0 FLAG 1056 -144 12V1A FLAG -32 240 Rec FLAG -32 528 Sens FLAG -512 -64 vta FLAG -512 112 vtb FLAG 432 240 drive FLAG 80 368 lim SYMBOL ind -608 80 R180 WINDOW 0 -35 92 Left 2 WINDOW 3 -75 63 Left 2 SYMATTR InstName L2 SYMATTR Value 0.04H SYMATTR Type ind SYMBOL ind -720 -32 R0 WINDOW 0 -35 20 Left 2 WINDOW 3 -39 46 Left 2 SYMATTR InstName L1 SYMATTR Value 2H SYMATTR Type ind SYMATTR SpiceLine Rser=5 SYMBOL diode -304 -96 R270 WINDOW 0 15 -1 VTop 2 WINDOW 3 2 54 VBottom 2 SYMATTR InstName D1 SYMATTR Value RSX301LAM30 SYMBOL voltage -832 -32 R0 WINDOW 3 -263 37 Left 2 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 WINDOW 0 14 4 Left 2 SYMATTR Value SINE(0 163 60) SYMATTR InstName V1 SYMBOL polcap -128 48 R0 SYMATTR InstName C5 SYMATTR Value 1000µ SYMATTR SpiceLine V=25 Irms=1.69 Rser=0.034 Lser=0 mfg="Panasonic" pn="ECA1EFQ102" type="Al electrolytic" SYMBOL res -64 320 M0 SYMATTR InstName R1 SYMATTR Value 0.51 SYMATTR SpiceLine pwr=1 SYMBOL res 0 384 R0 SYMATTR InstName R2 SYMATTR Value 22k SYMBOL npn 192 304 M270 WINDOW 0 62 57 VLeft 2 WINDOW 3 -6 147 VLeft 2 SYMATTR InstName Q1 SYMATTR Value 2N3904 SYMBOL res 256 272 M0 SYMATTR InstName R3 SYMATTR Value 3.3k SYMBOL res 416 512 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R4 SYMATTR Value 22 SYMATTR SpiceLine pwr=2 SYMBOL pnp 688 128 R180 WINDOW 0 42 59 Left 2 WINDOW 3 41 33 Left 2 SYMATTR InstName Q3 SYMATTR Value 2N3906 SYMBOL res 528 -96 R0 SYMATTR InstName R5 SYMATTR Value 2.2k SYMBOL res 752 -96 M0 SYMATTR InstName R6 SYMATTR Value 1.8k SYMBOL res 1104 208 R0 SYMATTR InstName R8 SYMATTR Value 12 SYMBOL zener 560 480 R180 WINDOW 0 -40 29 Left 2 WINDOW 3 -159 1 Left 2 SYMATTR InstName D6 SYMATTR Value BZX84C6V2L SYMBOL cap 880 208 R0 SYMATTR InstName C9 SYMATTR Value 100µ SYMATTR SpiceLine V=16 Irms=4.8 Rser=0.0064 Lser=3.543n mfg="Würth Elektronik" pn="870135373001 WCAP-PTHT 6,3 x 11" type="Al polymer" SYMBOL cap 496 384 M0 WINDOW 0 -22 -17 Left 2 WINDOW 3 -43 7 Left 2 SYMATTR InstName C8 SYMATTR Value 100n SYMATTR SpiceLine V=10 Irms=0 Rser=0 Lser=0 mfg="Murata" pn="GRM022R61A104KE01" type="X5R" SYMBOL res 720 496 M180 WINDOW 0 36 76 Left 2 WINDOW 3 36 40 Left 2 SYMATTR InstName R7 SYMATTR Value 1.5k SYMBOL cap -240 -176 R90 WINDOW 0 15 63 VBottom 2 WINDOW 3 -14 -5 VTop 2 SYMATTR InstName C1 SYMATTR Value 10n SYMBOL cap -240 -64 R90 WINDOW 0 14 63 VBottom 2 WINDOW 3 -16 -4 VTop 2 SYMATTR InstName C2 SYMATTR Value 10n SYMBOL cap -240 48 R90 WINDOW 0 12 62 VBottom 2 WINDOW 3 -15 -4 VTop 2 SYMATTR InstName C3 SYMATTR Value 10n SYMBOL cap -240 176 R90 WINDOW 0 12 67 VBottom 2 WINDOW 3 -16 -2 VTop 2 SYMATTR InstName C4 SYMATTR Value 10n SYMBOL polcap 32 336 R180 WINDOW 0 24 57 Left 2 WINDOW 3 24 8 Left 2 SYMATTR InstName C7 SYMATTR Value 10µ SYMATTR SpiceLine V=2.5 Irms=0 Rser=0 Lser=0 mfg="Murata" pn="GRM155R60E106ME16" type="X5R" SYMBOL TVSdiode -464 -16 R0 WINDOW 0 -36 18 Left 2 WINDOW 3 -119 73 Left 2 SYMATTR InstName D5 SYMATTR Value SMBJ24CA SYMBOL cap 976 208 R0 SYMATTR InstName C10 SYMATTR Value 0.22µ SYMATTR SpiceLine V=16 Irms=0 Rser=0.0118 Lser=347p mfg="Würth Elektronik" pn="885012105017 WCAP-CSGP 0402" type="X5R" SYMBOL res 848 -80 M0 SYMATTR InstName R9 SYMATTR Value 33k SYMBOL res 848 80 M0 SYMATTR InstName R10 SYMATTR Value 10k SYMBOL cap 720 224 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C12 SYMATTR Value 1n SYMBOL diode -304 16 R270 WINDOW 0 20 -1 VTop 2 WINDOW 3 2 54 VBottom 2 SYMATTR InstName D2 SYMATTR Value RSX301LAM30 SYMBOL diode -240 128 M270 WINDOW 0 20 68 VTop 2 WINDOW 3 2 11 VBottom 2 SYMATTR InstName D3 SYMATTR Value RSX301LAM30 SYMBOL diode -240 256 M270 WINDOW 0 22 67 VTop 2 WINDOW 3 -2 10 VBottom 2 SYMATTR InstName D4 SYMATTR Value RSX301LAM30 SYMBOL npn 400 384 R90 WINDOW 0 -6 61 VRight 2 WINDOW 3 -4 -45 VRight 2 SYMATTR InstName Q4 SYMATTR Value 2N3055 SYMBOL npn 448 272 R90 WINDOW 0 -9 91 VLeft 2 WINDOW 3 -8 39 VLeft 2 SYMATTR InstName Q2 SYMATTR Value 2N3904 TEXT -1104 80 Left 2 !.tran 0 10 1 startup TEXT -736 -104 Left 2 !K1 L1 L2 0.97

The note above fig 41 is especially insightful. TI must use their dumbest interns to write data sheets.

Analog video?

I have a prototype board now being built that has a small (efinix T20) FPGA driving six discrete resistors to make a fast DAC, for a direct-digital-synthsizer experiment.

I could buy a little R-2R network for production, if the idea works.

John Larkin Highland Tech Glen Canyon Design Center Lunatic Fringe Electronics

ASCII schematics used to make it fun, especially when every post in a thread had one. That was even better than alt.binaries.schematics.electronic

I hate ascii schematics.

Just sketch or whiteboard and take a pic.

LT Spice .asc posts are OK, a bit of a nuisance to view, if they actually work. Most are really hideous.

John Larkin Highland Tech Glen Canyon Design Center Lunatic Fringe Electronics