* SPICE netlist
V1 N009 0 5
V2 0 N008 5
R1 N011 IN2 20K
R2 N015 N011 14K
R3 N012 N011 20K
R4 N016 N014 20K
R5 N013 N014 10K
R6 N010 N014 14K
R7 N003 IN1 20K
R8 N004 N003 14K
R9 N006 N003 20K
R10 N005 N002 20K
R11 N007 N002 10K
R12 N002 N001 14K
V3 IN1 0 AC 1
V4 IN2 0 AC 1
XU1 N003 N004 N006 N001 N001 0 N009 N010 N010 N012 N015 N011 N014 N016 N013 OUT2 OUT2 N008 OUT1 OUT1 N007 N005 N002 LTC1068-25 Fclk=250K ;pnba INV B)HPB/NB)BPB)LPB)SB)AGND)V+)SA)LPA)BPA)HPA/NA)INV A)INV D)HPD/ND)BPD)LPD)SD)V-)SC)LPC)BPC)HPC/NC)INV C
.ac oct 200 1K 100K

* LTspice schematic (.asc)
Version 4
SHEET 1 992 1024
WIRE 320 -512 -112 -512
WIRE 448 -512 400 -512
WIRE -416 -432 -496 -432
WIRE -320 -432 -336 -432
WIRE -96 -432 -320 -432
WIRE 448 -432 448 -512
WIRE 448 -432 256 -432
WIRE -496 -416 -496 -432
WIRE -320 -368 -320 -432
WIRE -224 -368 -320 -368
WIRE -96 -368 -144 -368
WIRE 272 -368 256 -368
WIRE 448 -368 448 -432
WIRE 448 -368 352 -368
WIRE -496 -320 -496 -336
WIRE -320 -304 -320 -368
WIRE -304 -304 -320 -304
WIRE -96 -304 -224 -304
WIRE 352 -304 256 -304
WIRE 448 -304 448 -368
WIRE 448 -304 432 -304
WIRE -112 -240 -112 -512
WIRE -96 -240 -112 -240
WIRE 272 -240 256 -240
WIRE 496 -240 272 -240
WIRE -112 -176 -112 -240
WIRE -96 -176 -112 -176
WIRE 272 -176 272 -240
WIRE 272 -176 256 -176
WIRE 272 -112 256 -112
WIRE 368 -112 352 -112
WIRE -96 -48 -128 -48
WIRE -224 16 -256 16
WIRE -96 16 -144 16
WIRE -96 144 -112 144
WIRE 272 144 256 144
WIRE -112 208 -112 144
WIRE -96 208 -112 208
WIRE 272 208 272 144
WIRE 272 208 256 208
WIRE 496 208 272 208
WIRE -304 272 -320 272
WIRE -96 272 -224 272
WIRE 352 272 256 272
WIRE 448 272 432 272
WIRE -320 336 -320 272
WIRE -224 336 -320 336
WIRE -96 336 -144 336
WIRE 272 336 256 336
WIRE 448 336 448 272
WIRE 448 336 352 336
WIRE -416 400 -464 400
WIRE -320 400 -320 336
WIRE -320 400 -336 400
WIRE -96 400 -320 400
WIRE 448 400 448 336
WIRE 448 400 256 400
WIRE -464 416 -464 400
WIRE -112 480 -112 208
WIRE 304 480 -112 480
WIRE 448 480 448 400
WIRE 448 480 384 480
WIRE -464 512 -464 496
FLAG -256 16 0
FLAG 368 -112 0
FLAG -464 512 0
FLAG -464 400 IN2
FLAG -128 -48 0
FLAG 496 208 OUT2
FLAG -496 -320 0
FLAG -496 -432 IN1
FLAG 496 -240 OUT1
SYMBOL voltage -128 16 R90
SYMATTR InstName V1
SYMATTR Value 5
SYMBOL voltage 368 -112 R90
SYMATTR InstName V2
SYMATTR Value 5
SYMBOL res -320 384 R90
SYMATTR InstName R1
SYMATTR Value 20K
SYMBOL res -128 320 R90
SYMATTR InstName R2
SYMATTR Value 14K
SYMBOL res -208 256 R90
SYMATTR InstName R3
SYMATTR Value 20K
SYMBOL res 256 320 M90
SYMATTR InstName R4
SYMATTR Value 20K
SYMBOL res 336 256 M90
SYMATTR InstName R5
SYMATTR Value 10K
SYMBOL res 288 464 M90
SYMATTR InstName R6
SYMATTR Value 14K
SYMBOL res -320 -416 M270
SYMATTR InstName R7
SYMATTR Value 20K
SYMBOL res -128 -352 M270
SYMATTR InstName R8
SYMATTR Value 14K
SYMBOL res -208 -288 M270
SYMATTR InstName R9
SYMATTR Value 20K
SYMBOL res 256 -352 R270
SYMATTR InstName R10
SYMATTR Value 20K
SYMBOL res 336 -288 R270
SYMATTR InstName R11
SYMATTR Value 10K
SYMBOL res 416 -496 M270
SYMATTR InstName R12
SYMATTR Value 14K
SYMBOL voltage -496 -432 R0
SYMATTR InstName V3
SYMATTR Value AC 1
SYMBOL voltage -464 400 R0
SYMATTR InstName V4
SYMATTR Value AC 1
SYMBOL FilterProducts\\LTC1068-25 80 -176 R0
SYMATTR InstName U1
SYMATTR Value Fclk=250K