Version 4
SHEET 1 3048 876
WIRE 1296 -64 1248 -64
WIRE 1328 -64 1296 -64
WIRE 1168 -48 1136 -48
WIRE 1184 16 1184 -16
WIRE 1136 32 1136 -48
WIRE 1136 32 816 32
WIRE 0 80 -80 80
WIRE 128 80 80 80
WIRE 400 80 384 80
WIRE 496 80 496 16
WIRE 624 80 624 16
WIRE 752 80 752 16
WIRE 1136 96 1136 32
WIRE 1168 96 1136 96
WIRE 1296 112 1296 -64
WIRE 1296 112 1248 112
WIRE 1328 112 1296 112
WIRE 0 144 -32 144
WIRE 96 144 80 144
WIRE 128 144 96 144
WIRE 400 144 384 144
WIRE 816 144 816 32
WIRE 816 144 400 144
WIRE 976 144 816 144
WIRE 1088 144 1056 144
WIRE -32 192 -32 144
WIRE 1184 192 1184 160
WIRE 752 208 384 208
WIRE 992 208 992 192
WIRE -32 224 -32 192
WIRE 1264 224 1136 224
WIRE 1552 224 1552 160
WIRE 1664 224 1664 160
WIRE 816 240 816 144
WIRE 1040 256 1040 192
WIRE 1040 256 1008 256
WIRE 400 272 400 144
WIRE 400 272 288 272
WIRE 512 272 496 272
WIRE 752 272 752 208
WIRE 752 272 624 272
WIRE 1136 272 1136 224
WIRE 1168 272 1136 272
WIRE 1200 272 1200 256
WIRE 1264 288 1264 224
WIRE 1264 288 1232 288
WIRE 1312 288 1264 288
WIRE 1408 288 1392 288
WIRE 1472 288 1408 288
WIRE 1600 288 1552 288
WIRE 1712 288 1600 288
WIRE 1088 304 1088 144
WIRE 1168 304 1088 304
WIRE 272 320 144 320
WIRE -80 336 -80 80
WIRE -32 336 -32 304
WIRE -32 336 -80 336
WIRE 624 336 624 272
WIRE 656 336 624 336
WIRE 1200 336 1200 320
WIRE 288 352 288 272
WIRE 320 352 288 352
WIRE 416 352 416 272
WIRE 416 352 400 352
WIRE 432 352 416 352
WIRE 752 352 752 272
WIRE 752 352 720 352
WIRE -32 368 -32 336
WIRE 144 368 144 320
WIRE 160 368 144 368
WIRE 592 368 592 272
WIRE 592 368 496 368
WIRE 656 368 592 368
WIRE 272 384 272 320
WIRE 272 384 224 384
WIRE 320 384 272 384
WIRE 416 384 400 384
WIRE 432 384 416 384
WIRE 816 384 816 320
WIRE 976 384 816 384
WIRE 1088 384 1088 304
WIRE 1088 384 1056 384
WIRE 1712 384 1712 368
WIRE 1728 384 1712 384
WIRE 96 400 96 144
WIRE 160 400 96 400
WIRE 816 400 816 384
WIRE 1408 400 1408 288
WIRE 1440 400 1408 400
WIRE 1712 400 1712 384
WIRE 1600 432 1600 288
WIRE 1600 432 1584 432
WIRE 992 464 992 432
WIRE 1440 464 1408 464
WIRE 416 480 416 384
WIRE 448 480 416 480
WIRE 560 480 528 480
WIRE 1712 496 1712 480
WIRE 816 512 816 480
WIRE 1040 512 1040 432
WIRE 1040 512 1008 512
WIRE 560 528 560 480
WIRE 1312 576 1264 576
WIRE 1408 576 1408 464
WIRE 1408 576 1392 576
WIRE 1472 576 1408 576
FLAG -32 368 0
FLAG 1552 224 0
FLAG 1664 224 0
FLAG 1552 80 V+
FLAG -32 192 input
FLAG 1664 80 V-
FLAG 128 208 V-
FLAG 624 80 0
FLAG 624 -64 Vref
FLAG 400 80 V+
FLAG 752 80 0
FLAG 752 -64 Vdigital
FLAG 992 464 0
FLAG 992 208 0
FLAG 1008 256 range_switch
FLAG 1008 512 range_switch
FLAG 1264 576 0
FLAG 1472 352 V+
FLAG 1472 512 V-
FLAG 1728 384 output
FLAG 1712 496 0
FLAG 1552 576 Vref
FLAG 1200 160 V-
FLAG 1200 64 V+
FLAG 1184 192 0
FLAG 1328 112 range_switch
FLAG 1200 -16 V-
FLAG 1200 -112 V+
FLAG 1184 16 0
FLAG 1408 -64 Vdigital
FLAG 1168 128 Vref
FLAG 1168 -80 Vref-
FLAG 496 80 0
FLAG 496 -64 Vref-
FLAG 1200 336 V-
FLAG 1200 256 V+
FLAG 816 512 0
FLAG 560 528 0
FLAG 688 320 V+
FLAG 464 336 V+
FLAG 192 352 V+
FLAG 688 384 V-
FLAG 464 400 V-
FLAG 192 416 V-
SYMBOL voltage -32 208 R0
WINDOW 123 0 0 Left 2
WINDOW 39 24 44 Left 2
WINDOW 3 40 91 Left 2
SYMATTR Value 12
SYMATTR InstName V1
SYMBOL voltage 1552 64 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 15
SYMBOL voltage 1664 64 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value -15
SYMBOL res 96 128 R90
WINDOW 0 59 101 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 5K
SYMBOL Opamps\\LT1167 256 112 R0
SYMATTR InstName U1
SYMBOL voltage 624 -80 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V4
SYMATTR Value 1.25
SYMBOL res 96 64 R90
WINDOW 0 59 101 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 5K
SYMBOL voltage 752 -80 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V5
SYMATTR Value 5
SYMBOL sw 960 384 R270
WINDOW 3 -29 99 VRight 2
SYMATTR Value CSW
SYMATTR InstName S1
SYMBOL sw 960 144 R270
WINDOW 3 53 73 VRight 2
SYMATTR Value OSW
SYMATTR InstName S2
SYMBOL Comparators\\LT1011 1200 112 R0
WINDOW 3 38 53 Left 2
SYMATTR InstName U4
SYMBOL Comparators\\LT1011 1200 -64 R0
WINDOW 3 31 -69 Left 2
SYMATTR InstName U5
SYMBOL voltage 496 -80 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V6
SYMATTR Value -1.25
SYMBOL Opamps\\LTC2050 1472 432 R0
SYMATTR InstName U6
SYMBOL Opamps\\LTC1151 192 320 R0
WINDOW 3 -49 150 Left 2
SYMATTR InstName U2
SYMBOL Opamps\\LTC1151 464 304 R0
SYMATTR InstName U7
SYMBOL Opamps\\LTC1151 688 288 R0
WINDOW 3 -48 148 Left 2
SYMATTR InstName U8
SYMBOL Opamps\\LTC1151 1200 224 R0
SYMATTR InstName U3
SYMBOL res 416 336 R90
WINDOW 0 -6 101 VBottom 2
WINDOW 3 -34 57 VTop 2
SYMATTR InstName R3
SYMATTR Value 10K
SYMBOL res 416 368 R90
WINDOW 0 67 104 VBottom 2
WINDOW 3 40 61 VTop 2
SYMATTR InstName R4
SYMATTR Value 10K
SYMBOL res 512 256 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R5
SYMATTR Value 10K
SYMBOL res 608 256 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R6
SYMATTR Value 2
SYMBOL res 544 464 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R7
SYMATTR Value 10K
SYMBOL res 832 336 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R8
SYMATTR Value 9K
SYMBOL res 832 496 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R9
SYMATTR Value 1K
SYMBOL res 1296 304 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R10
SYMATTR Value 1Meg
SYMBOL res 1296 592 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R11
SYMATTR Value 1Meg
SYMBOL res 1456 592 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R12
SYMATTR Value 1Meg
SYMBOL res 1456 304 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R13
SYMATTR Value 1Meg
SYMBOL res 1696 272 R0
SYMATTR InstName R14
SYMATTR Value 10K
SYMBOL res 1696 384 R0
SYMATTR InstName R15
SYMATTR Value 10K
SYMBOL res 1312 -48 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R16
SYMATTR Value 1K
TEXT -48 -72 Left 2 !.model OSW SW(Ron=1K Roff=1G  Vt=1 Vh=0)
TEXT -48 -120 Left 2 !.model CSW SW(Ron=1G  Roff=1K Vt=1 Vh=0)
TEXT 832 584 Left 2 ;Automatic Voltage Range
TEXT 280 536 Left 2 ;Offset trimming
TEXT 1264 432 Left 2 ;Level shifting
TEXT -26 494 Left 2 !.tran 1
TEXT 1304 24 Left 2 ;Voltage level comparator