Version 4
SHEET 1 5864 2120
WIRE 1264 -1328 1232 -1328
WIRE 1376 -1328 1344 -1328
WIRE 1264 -1296 1232 -1296
WIRE 1376 -1296 1344 -1296
WIRE 1264 -1264 1232 -1264
WIRE 1376 -1264 1344 -1264
WIRE 1264 -1232 1232 -1232
WIRE 1376 -1232 1344 -1232
WIRE 1264 -1200 1232 -1200
WIRE 1376 -1200 1344 -1200
WIRE -288 -1184 -336 -1184
WIRE 208 -1184 160 -1184
WIRE 736 -1184 672 -1184
WIRE 1264 -1168 1232 -1168
WIRE 1376 -1168 1344 -1168
WIRE -336 -1152 -336 -1184
WIRE 160 -1152 160 -1184
WIRE 672 -1152 672 -1184
WIRE 1264 -1136 1232 -1136
WIRE 1376 -1136 1344 -1136
WIRE 1264 -1104 1232 -1104
WIRE 1376 -1104 1344 -1104
WIRE 1264 -1072 1232 -1072
WIRE 1376 -1072 1344 -1072
WIRE 1264 -1040 1232 -1040
WIRE 1376 -1040 1344 -1040
WIRE -336 -1024 -336 -1072
WIRE 160 -1024 160 -1072
WIRE 672 -1024 672 -1072
WIRE 1264 -1008 1232 -1008
WIRE 1376 -1008 1344 -1008
WIRE 1264 -976 1232 -976
WIRE 1376 -976 1344 -976
WIRE 368 -752 304 -752
WIRE 624 -752 560 -752
WIRE 640 -752 624 -752
WIRE -208 -720 -576 -720
WIRE 304 -720 304 -752
WIRE 560 -720 560 -752
WIRE 16 -672 -32 -672
WIRE -208 -656 -256 -656
WIRE 304 -608 304 -640
WIRE 560 -608 560 -640
WIRE -448 -464 -624 -464
WIRE -48 -464 -96 -464
WIRE -448 -432 -528 -432
WIRE -48 -432 -96 -432
WIRE -448 -400 -496 -400
WIRE -48 -400 -96 -400
WIRE 224 -400 160 -400
WIRE 240 -400 224 -400
WIRE -448 -368 -496 -368
WIRE -48 -368 -96 -368
WIRE 160 -368 160 -400
WIRE -448 -336 -592 -336
WIRE -48 -336 -96 -336
WIRE -448 -304 -560 -304
WIRE -48 -304 -96 -304
WIRE -448 -272 -544 -272
WIRE -48 -272 -96 -272
WIRE 160 -256 160 -288
WIRE -448 -240 -560 -240
WIRE -48 -240 -96 -240
FLAG -336 -1024 0
FLAG 160 -1024 0
FLAG -288 -1184 clk
IOPIN -288 -1184 Out
FLAG 208 -1184 start_adc
IOPIN 208 -1184 Out
FLAG -256 -656 start_adc
FLAG 16 -672 signal_sh
FLAG -576 -720 signal
IOPIN -576 -720 In
FLAG 672 -1024 0
FLAG 736 -1184 signal
IOPIN 736 -1184 Out
FLAG 304 -608 0
FLAG 368 -752 vref
IOPIN 368 -752 Out
FLAG 160 -256 0
FLAG 224 -400 dac_sar
FLAG 560 -608 0
FLAG 624 -752 comp
FLAG -624 -464 clk
IOPIN -624 -464 In
FLAG -528 -432 start_adc
IOPIN -528 -432 In
FLAG -496 -400 comp
FLAG -48 -464 s7
IOPIN -48 -464 Out
FLAG -48 -432 s6
IOPIN -48 -432 Out
FLAG -48 -400 s5
IOPIN -48 -400 Out
FLAG -48 -368 s4
IOPIN -48 -368 Out
FLAG -48 -336 s3
IOPIN -48 -336 Out
FLAG -48 -304 s2
IOPIN -48 -304 Out
FLAG -48 -272 s1
IOPIN -48 -272 Out
FLAG -48 -240 s0
IOPIN -48 -240 Out
FLAG -496 -368 starts
FLAG -592 -336 serdat
IOPIN -592 -336 Out
FLAG -560 -304 serframe
IOPIN -560 -304 Out
FLAG -544 -272 convdone
IOPIN -544 -272 Out
FLAG -560 -240 qdatvalid
IOPIN -560 -240 Out
FLAG 1232 -1264 convdone
FLAG 1376 -1264 convdone_
FLAG 1232 -1232 qdatvalid
FLAG 1376 -1232 qdatvalid_
FLAG 1232 -1200 s7
FLAG 1376 -1200 s7_
FLAG 1232 -1168 s6
FLAG 1376 -1168 s6_
FLAG 1232 -1136 s5
FLAG 1376 -1136 s5_
FLAG 1232 -1104 s4
FLAG 1376 -1104 s4_
FLAG 1232 -1072 s3
FLAG 1376 -1072 s3_
FLAG 1232 -1040 s2
FLAG 1376 -1040 s2_
FLAG 1232 -1008 s1
FLAG 1376 -1008 s1_
FLAG 1232 -976 s0
FLAG 1376 -976 s0_
FLAG 1232 -1328 serdat
FLAG 1376 -1328 serdat_
FLAG 1232 -1296 serframe
FLAG 1376 -1296 serframe_
SYMBOL voltage -336 -1168 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
WINDOW 3 -229 224 Left 0
SYMATTR InstName V1
SYMATTR Value PULSE(0 {VLOGIC} 0 1n 1n 49n 100n)
SYMBOL voltage 160 -1168 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
WINDOW 3 -229 223 Left 0
SYMATTR InstName V2
SYMATTR Value PULSE(0 {VLOGIC} 30n 1n 1n 300n 2u)
SYMBOL SpecialFunctions\\sample -128 -688 R0
SYMATTR InstName A38
SYMATTR SpiceLine REF={VLOGIC*0.5}
SYMBOL voltage 672 -1168 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
WINDOW 3 -258 225 Left 0
SYMATTR InstName V3
SYMATTR Value PWL(0 0.5 1.5u 0.5 1.6u 1 3.5u 1 3.6u 1.5 5.5u 1.5 5.6u 2 7.5u 2 7.6u 2.5)
SYMBOL voltage 304 -736 R0
SYMATTR InstName V4
SYMATTR Value 2.56
SYMBOL bv 160 -384 R0
SYMATTR InstName B1
SYMATTR Value V=int(V(s7)*128+V(s6)*64+V(s5)*32+V(s4)*16+V(s3)*8+V(s2)*4+V(s1)*2+V(s0)+0.5)/256*V(vref)/{VLOGIC}
SYMBOL bv 560 -736 R0
SYMATTR InstName B2
SYMATTR Value V={VLOGIC}*0.5*(1+tanh(10000*(V(signal_sh)-V(dac_sar)+V(vref)/512)))
SYMBOL SAR8bit -288 -400 R0
SYMATTR InstName X1
SYMATTR SpiceLine VLOGIC={VLOGIC}
SYMBOL dview12 1280 -1184 R0
SYMATTR InstName U1
TEXT -728 -1128 Left 0 !.tran 0 10u 0 10n
TEXT -728 -1088 Left 0 !.options plotwinsize=0
TEXT -728 -1032 Left 0 !.options reltol=0.001
TEXT -728 -1176 Left 0 !.param VLOGIC=3
TEXT 408 -432 Left 0 ;DAC
TEXT 776 -768 Left 0 ;COMPARATOR
TEXT -416 -776 Left 0 ;SAMPLE/HOLD
TEXT -280 -520 Left 0 ;SAR-LOGIC
TEXT -672 -864 Left 0 ;8Bit ADC
TEXT 288 -784 Left 0 ;REFERENCE
TEXT -728 -992 Left 0 !.options method=gear
TEXT 816 -680 Left 0 ;Watch the small extra half LSB offset Vref/512
TEXT -40 -1368 Left 0 ;Enable saving the subcircuit node values if you want probe the lower level SAR circuit.\nControl Panel -> Save Defaults -> x Save Subcircuits ...\n \nDVIEW12 is only used to get a nice plot. The same could be done with "Plot Defs"\nor simply by plotting with equations (offsets), e.g. V(s5)+5.
TEXT -720 -1368 Left 0 ;8Bit - ADC With Successive Approximation (SAR)\n \nV 1.0 05/06/2007
TEXT 1056 -1368 Left 0 !.include dview.lib
TEXT 1256 -1392 Left 0 ;Display Help
RECTANGLE Normal 1488 -144 -736 -896
RECTANGLE Normal 160 -560 -448 -800 2
RECTANGLE Normal 1424 -560 496 -800 2
RECTANGLE Normal 1424 -208 80 -464 2