Version 4
SHEET 1 2080 1748
WIRE -2848 -512 -3040 -512
WIRE -2464 -512 -2768 -512
WIRE -2608 -432 -3024 -432
WIRE -2592 -432 -2608 -432
WIRE -2496 -432 -2512 -432
WIRE -3024 -384 -3024 -432
WIRE -3008 -384 -3024 -384
WIRE -2608 -384 -2608 -432
WIRE -2608 -384 -2624 -384
WIRE -3440 -304 -3536 -304
WIRE -3296 -304 -3360 -304
WIRE -3232 -304 -3296 -304
WIRE -3008 -304 -3152 -304
WIRE -2592 -304 -2624 -304
WIRE -2464 -304 -2464 -512
WIRE -2464 -304 -2512 -304
WIRE -3536 -288 -3536 -304
WIRE -3296 -224 -3296 -304
WIRE -3008 -224 -3296 -224
WIRE -2464 -224 -2464 -304
WIRE -2464 -224 -2624 -224
WIRE -2432 -224 -2464 -224
WIRE -2320 -224 -2352 -224
WIRE -3536 -192 -3536 -208
WIRE -3296 -144 -3296 -224
WIRE -3216 -144 -3296 -144
WIRE -3040 -144 -3040 -512
WIRE -3040 -144 -3136 -144
WIRE -3008 -144 -3040 -144
WIRE -2320 -144 -2320 -224
WIRE -2320 -144 -2624 -144
WIRE -2304 -144 -2320 -144
WIRE -3008 -64 -3024 -64
WIRE -2608 -64 -2624 -64
WIRE -3008 16 -3024 16
WIRE -2608 16 -2624 16
WIRE -3008 96 -3024 96
WIRE -2608 96 -2624 96
WIRE -3008 176 -3024 176
WIRE -2608 176 -2624 176
WIRE -3120 224 -3136 224
WIRE -3024 224 -3024 176
WIRE -3024 224 -3040 224
WIRE -2608 224 -2608 176
WIRE -2608 224 -3024 224
FLAG -3536 -192 0
FLAG -3536 -304 IN
FLAG -2496 -432 0
FLAG -3136 224 0
FLAG -3024 16 0
FLAG -2608 16 0
FLAG -2304 -144 OUT
FLAG -3024 96 0
FLAG -2608 96 0
SYMBOL voltage -2608 -432 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 -32 56 VBottom 2
SYMATTR InstName V2
SYMATTR Value 5
SYMBOL voltage -3024 224 R90
WINDOW 0 -32 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName V3
SYMATTR Value -5
SYMBOL res -3120 -160 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value {.72G/fc}
SYMATTR SpiceLine tol=1
SYMBOL res -3456 -288 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName ZA3
SYMATTR Value {.72G/fc}
SYMATTR SpiceLine tol=1
SYMBOL res -3248 -288 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R2
SYMATTR Value {1.14G/fc}
SYMATTR SpiceLine tol=1
SYMBOL LT1568 -2816 32 R0
WINDOW 0 5 -380 Center 2
WINDOW 3 8 -301 Center 2
SYMATTR InstName U1
SYMBOL res -2336 -240 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value {.88G/fc}
SYMATTR SpiceLine tol=1
SYMBOL res -2752 -528 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName ZAB1
SYMATTR Value {.88G/fc}
SYMATTR SpiceLine tol=1
SYMBOL res -2496 -320 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R5
SYMATTR Value {.72G/fc}
SYMATTR SpiceLine tol=1
SYMBOL voltage -3536 -304 R0
WINDOW 123 21 94 Left 2
WINDOW 39 24 117 Left 2
SYMATTR Value2 AC 1
SYMATTR InstName V1
SYMATTR Value ""
TEXT -2528 200 Left 2 !.ac oct 250 10K 20Meg
TEXT -2528 160 Left 2 !.param fc=1Meg
TEXT -2832 -560 Bottom 2 ;LT1568 - Very Low Noise, High Frequency Active RC, Filter Building Block\n4th Order, Butterworth, Lowpass Filter (Linear Passband Phase)\nLow Overshoot and Fast Settling Transient Response\nPassband Gain = 0dB
TEXT -3536 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.