Version 4
SHEET 1 1008 712
WIRE -112 -80 -144 -80
WIRE -16 -80 -48 -80
WIRE 416 -64 272 -64
WIRE 608 -64 496 -64
WIRE -144 16 -144 -80
WIRE -144 16 -272 16
WIRE -112 16 -144 16
WIRE -16 16 -16 -80
WIRE -16 16 -32 16
WIRE -272 64 -272 16
WIRE 480 64 448 64
WIRE 576 64 544 64
WIRE -144 96 -144 16
WIRE -112 96 -144 96
WIRE -16 112 -16 16
WIRE -16 112 -48 112
WIRE 144 112 -16 112
WIRE 272 112 272 -64
WIRE 272 112 224 112
WIRE 336 112 272 112
WIRE 448 112 448 64
WIRE 448 112 416 112
WIRE -112 128 -176 128
WIRE 272 160 272 112
WIRE -272 176 -272 144
WIRE -176 176 -176 128
WIRE -176 176 -272 176
WIRE 448 176 448 112
WIRE 464 176 448 176
WIRE 576 192 576 64
WIRE 576 192 528 192
WIRE 608 192 608 -64
WIRE 608 192 576 192
WIRE 656 192 608 192
WIRE 768 192 736 192
WIRE 864 192 768 192
WIRE 464 208 448 208
WIRE -112 224 -144 224
WIRE -16 224 -48 224
WIRE 144 272 64 272
WIRE 272 272 272 224
WIRE 272 272 224 272
WIRE 336 272 272 272
WIRE 448 272 448 208
WIRE 448 272 416 272
WIRE 864 272 864 192
WIRE -144 320 -144 224
WIRE -144 320 -272 320
WIRE -112 320 -144 320
WIRE -16 320 -16 224
WIRE -16 320 -32 320
WIRE 272 320 272 272
WIRE 448 320 448 272
WIRE -272 336 -272 320
WIRE -144 400 -144 320
WIRE -112 400 -144 400
WIRE -16 416 -16 320
WIRE -16 416 -48 416
WIRE 64 416 64 272
WIRE 64 416 -16 416
WIRE 272 416 272 400
WIRE 448 416 448 384
WIRE 448 416 272 416
WIRE 624 416 448 416
WIRE 864 416 864 352
WIRE 864 416 624 416
WIRE -272 432 -272 416
WIRE -176 432 -176 176
WIRE -176 432 -272 432
WIRE -112 432 -176 432
WIRE 624 448 624 416
WIRE -176 464 -176 432
WIRE -448 512 -448 496
WIRE -448 512 -512 512
WIRE -512 544 -512 512
WIRE -448 544 -448 512
FLAG -176 464 0
FLAG 624 448 0
FLAG 768 192 out
FLAG -80 80 +V
FLAG -80 384 +V
FLAG 496 160 +V
FLAG -80 144 V-
FLAG -80 448 V-
FLAG 496 224 V-
FLAG -512 544 0
FLAG -448 416 +V
FLAG -448 624 V-
SYMBOL res -128 32 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 1 80 VBottom 2
SYMATTR InstName R1
SYMATTR Value 560
SYMBOL res -128 336 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 -2 84 VBottom 2
SYMATTR InstName R2
SYMATTR Value 560
SYMBOL cap -112 240 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName C1
SYMATTR Value 3.3n
SYMBOL cap -112 -64 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName C2
SYMATTR Value 3.3n
SYMBOL res 320 128 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R3
SYMATTR Value 340
SYMBOL res 320 288 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R4
SYMATTR Value 340
SYMBOL res 128 128 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R5
SYMATTR Value 430
SYMBOL res 128 288 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R6
SYMATTR Value 430
SYMBOL res 256 304 R0
SYMATTR InstName R7
SYMATTR Value 280
SYMBOL res 400 -48 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R8
SYMATTR Value 280
SYMBOL cap 256 160 R0
SYMATTR InstName C3
SYMATTR Value 8.2n
SYMBOL cap 432 320 R0
SYMATTR InstName C4
SYMATTR Value 2.2n
SYMBOL cap 480 80 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName C5
SYMATTR Value 2.2n
SYMBOL res 640 208 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R9
SYMATTR Value 100
SYMBOL res 848 256 R0
SYMATTR InstName R10
SYMATTR Value 10k
SYMBOL current -272 64 R0
WINDOW 3 24 28 Left 2
WINDOW 123 24 56 Left 2
WINDOW 39 0 0 Left 2
SYMATTR Value -6.2m
SYMATTR Value2 AC 3.9m 180
SYMATTR InstName I1
SYMBOL Opamps\\opamp2 -80 48 R0
SYMATTR InstName U1
SYMATTR Value OPA2134
SYMBOL Opamps\\opamp2 -80 352 R0
SYMATTR InstName U2
SYMATTR Value OPA2134
SYMBOL Opamps\\opamp2 496 128 R0
SYMATTR InstName U3
SYMATTR Value OPA2134
SYMBOL voltage -448 400 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 12
SYMBOL voltage -448 528 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 12
SYMBOL current -272 336 R0
WINDOW 3 24 28 Left 2
WINDOW 123 24 56 Left 2
WINDOW 39 0 0 Left 2
SYMATTR Value -6.2m
SYMATTR Value2 AC 3.9m 0
SYMATTR InstName I2
TEXT -280 696 Left 2 !.ac oct 100 10 1000k
TEXT -240 648 Left 1 !.lib OPA2134.lib
TEXT -224 544 Left 1 ;I/V stage, 1st order low-pass\nfci = fc = 86kHz
TEXT 784 144 Left 1 ;Vout = 2.0Vrms
TEXT 384 520 Left 1 ;2nd order MFB low-pass\nA0 = 0.62\nfci = 1.272*fc = 109kHz\nQ = a = b = 1.00
TEXT -256 -176 Left 2 ;Current-to-Voltage converter with 3rd order Butterworth low-pass filter at 86kHz
TEXT -528 232 Left 1 ;Input imitates PCM1792A/PCM1794A\nDAC current output. Full-scale differential\noutput is 7.8mApp centered at -6.2mA.