Version 4
SHEET 1 2080 1748
WIRE -2960 -512 -3168 -512
WIRE -2576 -512 -2880 -512
WIRE -2720 -432 -3136 -432
WIRE -2704 -432 -2720 -432
WIRE -2608 -432 -2624 -432
WIRE -3136 -384 -3136 -432
WIRE -3120 -384 -3136 -384
WIRE -2720 -384 -2720 -432
WIRE -2720 -384 -2736 -384
WIRE -3696 -304 -3792 -304
WIRE -3568 -304 -3616 -304
WIRE -3488 -304 -3568 -304
WIRE -3360 -304 -3408 -304
WIRE -3296 -304 -3360 -304
WIRE -3120 -304 -3216 -304
WIRE -2704 -304 -2736 -304
WIRE -2576 -304 -2576 -512
WIRE -2576 -304 -2624 -304
WIRE -3792 -288 -3792 -304
WIRE -3568 -288 -3568 -304
WIRE -3360 -224 -3360 -304
WIRE -3120 -224 -3360 -224
WIRE -2576 -224 -2576 -304
WIRE -2576 -224 -2736 -224
WIRE -2544 -224 -2576 -224
WIRE -2432 -224 -2464 -224
WIRE -3792 -192 -3792 -208
WIRE -3568 -192 -3568 -224
WIRE -3360 -144 -3360 -224
WIRE -3296 -144 -3360 -144
WIRE -3168 -144 -3168 -512
WIRE -3168 -144 -3216 -144
WIRE -3120 -144 -3168 -144
WIRE -2432 -144 -2432 -224
WIRE -2432 -144 -2736 -144
WIRE -2416 -144 -2432 -144
WIRE -3120 -64 -3136 -64
WIRE -2720 -64 -2736 -64
WIRE -3120 16 -3136 16
WIRE -2720 16 -2736 16
WIRE -3120 96 -3136 96
WIRE -2720 96 -2736 96
WIRE -3120 176 -3136 176
WIRE -2720 176 -2736 176
WIRE -3232 224 -3248 224
WIRE -3136 224 -3136 176
WIRE -3136 224 -3152 224
WIRE -2720 224 -2720 176
WIRE -2720 224 -3136 224
FLAG -3792 -192 0
FLAG -3792 -304 IN
FLAG -2608 -432 0
FLAG -3248 224 0
FLAG -2416 -144 OUT
FLAG -3136 16 0
FLAG -2720 16 0
FLAG -3568 -192 0
FLAG -3136 96 0
FLAG -2720 96 0
SYMBOL voltage -2720 -432 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 -32 56 VBottom 2
SYMATTR InstName V2
SYMATTR Value 5
SYMBOL voltage -3136 224 R90
WINDOW 0 -32 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName V3
SYMATTR Value -5
SYMBOL res -3200 -160 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value {1.26G/fc}
SYMATTR SpiceLine tol=1
SYMBOL res -3504 -288 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName ZA3
SYMATTR Value {.63G/fc}
SYMATTR SpiceLine tol=1
SYMBOL res -3312 -288 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R2
SYMATTR Value {.77G/fc}
SYMATTR SpiceLine tol=1
SYMBOL LT1568 -2928 32 R0
WINDOW 0 5 -380 Center 2
WINDOW 3 8 -301 Center 2
SYMATTR InstName U1
SYMBOL res -2448 -240 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value {2G/fc}
SYMATTR SpiceLine tol=1
SYMBOL res -2864 -528 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName ZAB1
SYMATTR Value {2G/fc}
SYMATTR SpiceLine tol=1
SYMBOL res -2608 -320 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R5
SYMATTR Value {.73G/fc}
SYMATTR SpiceLine tol=1
SYMBOL voltage -3792 -304 R0
WINDOW 123 23 99 Left 2
WINDOW 39 24 117 Left 2
SYMATTR Value2 AC 1
SYMATTR InstName V1
SYMATTR Value ""
SYMBOL res -3712 -288 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName ZA1
SYMATTR Value {.63G/fc}
SYMATTR SpiceLine tol=1
SYMBOL cap -3584 -288 R0
SYMATTR InstName ZA2
SYMATTR Value 1n
TEXT -2648 208 Left 2 !.ac oct 250 10K 10Meg
TEXT -2648 168 Left 2 !.param fc=1Meg
TEXT -3088 -560 Bottom 2 ;LT1568 - Very Low Noise, High Frequency Active RC, Filter Building Block\n5th Order, Butterworth, Lowpass Filter\nPassband Gain = 0dB
TEXT -3760 280 Left 2 ;Notes: \n  Min R3 and R4 is 100ohms. See Demo Manual DC675B for details.\n  Any impedance in series or parallel with an input resistor changes the filter's poles and passband gain.\n  If the simulation model is not found please update with the "Sync Release" command from the "Tools" menu.\n  It remains the customer's responsibility to verify proper and reliable operation in the actual application.\n  Component substitution and printed circuit board layout may significantly affect circuit performance or reliability.\n  Contact your local sales representative for assistance. This circuit is distributed to customers only for use with LTC parts.\n  Copyright © 2015 Linear Technology Inc.  All rights reserved.