Version 4
SHEET 1 13220 6980
WIRE 9248 2880 9232 2880
WIRE 9456 2880 9440 2880
WIRE 9664 2880 9648 2880
WIRE 9232 2928 9232 2880
WIRE 9440 2928 9440 2880
WIRE 9648 2928 9648 2880
WIRE 9232 3024 9232 3008
WIRE 9440 3024 9440 3008
WIRE 9648 3024 9648 3008
WIRE 7936 3696 7936 3632
WIRE 7552 3760 7552 3728
WIRE 5648 3776 5648 3744
WIRE 5872 3776 5872 3744
WIRE 6080 3776 6080 3744
WIRE 6256 3776 6256 3744
WIRE 6448 3776 6448 3744
WIRE 6624 3776 6624 3744
WIRE 6832 3776 6832 3744
WIRE 7008 3776 7008 3744
WIRE 7248 3776 7248 3744
WIRE 7936 3808 7936 3776
WIRE 9136 3824 9104 3824
WIRE 9200 3824 9136 3824
WIRE 9232 3824 9200 3824
WIRE 9552 3824 9520 3824
WIRE 9616 3824 9552 3824
WIRE 9680 3824 9616 3824
WIRE 9744 3824 9680 3824
WIRE 9136 3856 9136 3824
WIRE 9616 3856 9616 3824
WIRE 7552 3872 7552 3840
WIRE 5648 3888 5648 3856
WIRE 5872 3888 5872 3856
WIRE 6080 3888 6080 3856
WIRE 6256 3888 6256 3856
WIRE 6448 3888 6448 3856
WIRE 6624 3888 6624 3856
WIRE 6832 3888 6832 3856
WIRE 7008 3888 7008 3856
WIRE 7248 3888 7248 3856
WIRE 9200 3888 9200 3824
WIRE 9232 3888 9200 3888
WIRE 9552 3888 9552 3824
WIRE 9552 3888 9520 3888
WIRE 9136 3936 9136 3920
WIRE 9616 3936 9616 3920
WIRE 9376 3952 9376 3920
WIRE 8896 4176 8880 4176
WIRE 7104 4352 7104 4320
WIRE 7168 4352 7104 4352
WIRE 9744 4352 9744 3824
WIRE 9744 4352 8912 4352
WIRE 7104 4368 7104 4352
WIRE 7168 4400 7168 4352
WIRE 9920 4400 9888 4400
WIRE 10000 4400 9920 4400
WIRE 10064 4400 10000 4400
WIRE 5840 4416 5792 4416
WIRE 6272 4416 5840 4416
WIRE 7248 4416 7232 4416
WIRE 9920 4416 9920 4400
WIRE 10000 4416 10000 4400
WIRE 6464 4432 6464 4400
WIRE 7232 4432 7232 4416
WIRE 7760 4432 7520 4432
WIRE 7968 4432 7840 4432
WIRE 8304 4432 7968 4432
WIRE 8656 4432 8384 4432
WIRE 8784 4432 8656 4432
WIRE 9056 4432 8976 4432
WIRE 9152 4432 9056 4432
WIRE 9328 4432 9232 4432
WIRE 9488 4432 9328 4432
WIRE 9744 4432 9744 4352
WIRE 7312 4448 7296 4448
WIRE 7296 4464 7296 4448
WIRE 8656 4464 8656 4432
WIRE 9328 4464 9328 4432
WIRE 5792 4480 5792 4416
WIRE 7376 4480 7360 4480
WIRE 7968 4480 7968 4432
WIRE 8848 4480 8848 4464
WIRE 8880 4480 8880 4176
WIRE 8912 4480 8912 4352
WIRE 9888 4480 9888 4400
WIRE 9888 4480 9872 4480
WIRE 7360 4496 7360 4480
WIRE 9920 4496 9920 4480
WIRE 9968 4496 9920 4496
WIRE 10000 4496 10000 4480
WIRE 10000 4496 9968 4496
WIRE 6272 4512 6272 4416
WIRE 6352 4512 6272 4512
WIRE 6928 4512 6576 4512
WIRE 7040 4512 6928 4512
WIRE 8784 4512 8784 4432
WIRE 8800 4512 8784 4512
WIRE 9968 4512 9968 4496
WIRE 8800 4544 8656 4544
WIRE 8976 4544 8976 4432
WIRE 9488 4560 9488 4432
WIRE 9520 4560 9488 4560
WIRE 6352 4576 6320 4576
WIRE 6976 4576 6960 4576
WIRE 7520 4576 7520 4432
WIRE 8656 4576 8448 4576
WIRE 8800 4576 8656 4576
WIRE 9328 4576 9328 4528
WIRE 9392 4576 9328 4576
WIRE 10016 4576 9872 4576
WIRE 10064 4576 10016 4576
WIRE 9520 4592 9488 4592
WIRE 10016 4592 10016 4576
WIRE 5792 4608 5792 4560
WIRE 5792 4608 5632 4608
WIRE 6976 4608 6976 4576
WIRE 7040 4608 6976 4608
WIRE 7968 4608 7968 4544
WIRE 7968 4608 7936 4608
WIRE 8656 4608 8656 4576
WIRE 8800 4608 8736 4608
WIRE 9392 4608 9392 4576
WIRE 6976 4624 6976 4608
WIRE 7936 4624 7936 4608
WIRE 9328 4624 9328 4576
WIRE 5632 4640 5632 4608
WIRE 6352 4640 6272 4640
WIRE 6848 4640 6576 4640
WIRE 8800 4640 8768 4640
WIRE 5792 4656 5792 4608
WIRE 7968 4656 7968 4608
WIRE 8768 4656 8768 4640
WIRE 9904 4672 9872 4672
WIRE 10016 4672 10016 4656
WIRE 6320 4704 6320 4576
WIRE 6352 4704 6320 4704
WIRE 6608 4704 6576 4704
WIRE 6640 4704 6608 4704
WIRE 6752 4704 6720 4704
WIRE 7040 4704 7024 4704
WIRE 8656 4704 8656 4688
WIRE 8736 4704 8736 4608
WIRE 8736 4704 8656 4704
WIRE 8976 4720 8976 4608
WIRE 9056 4720 8976 4720
WIRE 9152 4720 9056 4720
WIRE 9328 4720 9328 4688
WIRE 9328 4720 9232 4720
WIRE 9488 4720 9488 4592
WIRE 9488 4720 9328 4720
WIRE 6752 4736 6752 4704
WIRE 6848 4768 6848 4640
WIRE 6944 4768 6848 4768
WIRE 7024 4768 7024 4704
WIRE 7024 4768 6944 4768
WIRE 7296 4784 7296 4752
WIRE 7520 4784 7520 4656
WIRE 7760 4784 7520 4784
WIRE 7968 4784 7968 4720
WIRE 7968 4784 7840 4784
WIRE 8304 4784 7968 4784
WIRE 8448 4784 8448 4576
WIRE 8448 4784 8384 4784
WIRE 8912 4784 8912 4672
WIRE 9744 4784 9744 4720
WIRE 9744 4784 8912 4784
WIRE 5632 4816 5632 4720
WIRE 5792 4816 5792 4736
WIRE 5840 4816 5792 4816
WIRE 6272 4816 6272 4640
WIRE 6272 4816 5840 4816
WIRE 8880 4816 8880 4672
WIRE 6320 4832 6320 4704
WIRE 6608 4832 6608 4704
WIRE 9744 4832 9744 4784
WIRE 6416 4864 6416 4832
WIRE 6512 4864 6512 4832
WIRE 7104 4880 7104 4848
WIRE 7200 4880 7200 4864
WIRE 8880 4912 8880 4896
FLAG 5648 3888 0
FLAG 5872 3888 0
FLAG 5648 3744 switch_VDD
FLAG 5872 3744 switch_VSS
FLAG 7296 4784 0
FLAG 7200 4880 0
FLAG 6512 4864 0
FLAG 6080 3888 0
FLAG 6080 3744 PGIA_Vp
FLAG 6256 3888 0
FLAG 6256 3744 PGIA_Vn
FLAG 7936 3808 0
FLAG 7936 3632 CNV
FLAG 7248 4416 A2
FLAG 7312 4448 A1
FLAG 7376 4480 A0
FLAG 9232 3024 0
FLAG 9248 2880 A0
FLAG 9440 3024 0
FLAG 9456 2880 A1
FLAG 9648 3024 0
FLAG 9664 2880 A2
FLAG 6464 4400 switch_VDD
FLAG 6416 4864 switch_VSS
FLAG 7104 4320 PGIA_Vp
FLAG 7104 4880 PGIA_Vn
FLAG 6448 3888 0
FLAG 6448 3744 ADC_VDD
FLAG 6624 3888 0
FLAG 6624 3744 driver_Vp
FLAG 6832 3888 0
FLAG 6832 3744 driver_Vn
FLAG 7008 3888 0
FLAG 7008 3744 reference_Vin
FLAG 7520 4432 PGIA_out_p
FLAG 7520 4784 PGIA_out_n
FLAG 6928 4512 PGIA_in_n
FLAG 6944 4768 PGIA_in_p
FLAG 5632 4816 0
FLAG 7248 3888 0
FLAG 7248 3744 switch_Vlogic
FLAG 6320 4832 switch_Vlogic
FLAG 6976 4688 0
FLAG 5840 4416 Vin_p
FLAG 5840 4816 Vin_n
FLAG 7936 4624 0
FLAG 6608 4832 fault_flag
FLAG 6752 4736 switch_Vlogic
FLAG 9376 3952 0
FLAG 9104 3824 reference_Vin
FLAG 9616 3936 0
FLAG 9680 3824 refbuf
FLAG 7552 3872 0
FLAG 7552 3728 Vocm
FLAG 10064 4400 ADC_VDD
FLAG 10016 4672 0
FLAG 10064 4576 Vout
FLAG 9904 4672 CNV
FLAG 9744 4832 0
FLAG 9392 4608 0
FLAG 8768 4656 0
FLAG 8880 4912 0
FLAG 8848 4464 driver_Vp
FLAG 8848 4672 driver_Vn
FLAG 8896 4176 Vocm
FLAG 6960 4576 Vocm
FLAG 9968 4512 0
FLAG 9136 3936 0
FLAG 9056 4720 driver_out_p
FLAG 9056 4432 driver_out_m
FLAG 9488 4432 ADC_in+
FLAG 9488 4720 ADC_in-
SYMBOL voltage 5648 3760 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value {switch_VDD}
SYMBOL voltage 5872 3760 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value {switch_VSS}
SYMBOL Switches\\ADG5421F 6464 4624 R0
SYMATTR InstName U4
SYMBOL OpAmps\\LTC6373 7184 4608 R0
WINDOW 0 224 -77 Left 2
SYMATTR InstName U6
SYMBOL cap 7184 4800 R0
SYMATTR InstName C5
SYMATTR Value 180p
SYMBOL res 6736 4688 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName Rpullup
SYMATTR Value 1k
SYMBOL res 7856 4416 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R5
SYMATTR Value {FilterResistor}
SYMBOL res 7856 4768 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R6
SYMATTR Value {FilterResistor}
SYMBOL voltage 6080 3760 R0
WINDOW 123 0 0 Left 0
WINDOW 39 24 124 Left 2
SYMATTR SpiceLine Rser=1m
SYMATTR InstName V3
SYMATTR Value {PGIA_Vp}
SYMBOL voltage 6256 3760 R0
WINDOW 123 0 0 Left 0
WINDOW 39 24 124 Left 2
SYMATTR SpiceLine Rser=1m
SYMATTR InstName V4
SYMATTR Value {PGIA_Vn}
SYMBOL voltage 7936 3680 R0
WINDOW 123 0 0 Left 0
WINDOW 39 36 120 Left 2
WINDOW 3 13 96 Left 2
SYMATTR Value PULSE(0 1.8 {ACQ_delay} 0.8n 0.8n {1/(12.5*fs)} {1/fs})
SYMATTR InstName V5
SYMBOL voltage 9232 2912 R0
WINDOW 0 24 16 Invisible 2
WINDOW 3 6 11 Left 2
SYMATTR InstName V11
SYMATTR Value {A0_level}
SYMBOL voltage 9440 2912 R0
WINDOW 0 24 16 Invisible 2
WINDOW 3 6 11 Left 2
SYMATTR InstName V12
SYMATTR Value {A1_level}
SYMBOL voltage 9648 2912 R0
WINDOW 0 24 16 Invisible 2
WINDOW 3 6 11 Left 2
SYMATTR InstName V14
SYMATTR Value {A2_level}
SYMBOL voltage 6448 3760 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V13
SYMATTR Value {ADC_VDD}
SYMBOL voltage 6624 3760 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V15
SYMATTR Value {driver_Vp}
SYMBOL voltage 6832 3760 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V16
SYMATTR Value {driver_Vn}
SYMBOL voltage 7008 3760 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V19
SYMATTR Value {reference_Vin}
SYMBOL voltage 5792 4640 R0
WINDOW 123 47 66 Left 2
WINDOW 39 0 0 Left 0
WINDOW 3 15 95 Left 2
WINDOW 0 48 37 Left 2
SYMATTR Value2 AC 0.5 0
SYMATTR Value SINE(0 {input_Vpp/4} {input_freq})
SYMATTR InstName Vin_n
SYMBOL voltage 5632 4624 R0
WINDOW 123 13 127 Left 2
WINDOW 39 0 0 Left 0
WINDOW 0 10 101 Left 2
WINDOW 3 9 154 Left 2
SYMATTR Value2 AC 0
SYMATTR InstName Vin_cm
SYMATTR Value {input_cm}
SYMBOL voltage 5792 4464 R0
WINDOW 123 42 70 Left 2
WINDOW 39 0 0 Left 0
WINDOW 3 15 95 Left 2
WINDOW 0 43 45 Left 2
SYMATTR Value2 AC 0.5 0
SYMATTR Value SINE(0 {input_Vpp/4} {input_freq})
SYMATTR InstName Vin_p
SYMBOL voltage 7248 3760 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V6
SYMATTR Value {switch_Vlogic}
SYMBOL cap 6992 4688 R180
WINDOW 0 24 56 Left 2
WINDOW 3 33 19 Left 2
SYMATTR InstName C1
SYMATTR Value 0.1µ
SYMBOL cap 7952 4480 R0
SYMATTR InstName C3
SYMATTR Value {FilterCapacitor}
SYMBOL cap 7952 4656 R0
SYMATTR InstName C4
SYMATTR Value {FilterCapacitor}
SYMBOL References\\LTC6655-4.096 9376 3856 R0
SYMATTR InstName U2
SYMBOL cap 9600 3856 R0
SYMATTR InstName C10
SYMATTR Value 10µ
SYMBOL voltage 7552 3744 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V7
SYMATTR Value 2.048
SYMBOL OpAmps\\ADA4945-HP 8848 4576 R0
WINDOW 3 128 1 Left 2
SYMATTR InstName U1
SYMBOL ADC\\LTC2387-18 9776 4576 R0
SYMATTR InstName U5
SYMBOL cap 10000 4592 R0
SYMATTR InstName C2
SYMATTR Value 10p
SYMBOL cap 9312 4464 R0
SYMATTR InstName C6
SYMATTR Value 82p
SYMBOL cap 9312 4624 R0
SYMATTR InstName C7
SYMATTR Value 82p
SYMBOL res 9248 4416 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 24.9
SYMBOL res 9248 4704 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 24.9
SYMBOL voltage 8880 4800 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V8
SYMATTR Value 5
SYMBOL res 8672 4560 R180
WINDOW 0 -33 61 Left 2
WINDOW 3 40 60 Left 2
SYMATTR InstName R3
SYMATTR Value {driver_Rfb}
SYMBOL res 8672 4704 R180
WINDOW 0 -42 62 Left 2
WINDOW 3 40 60 Left 2
SYMATTR InstName R11
SYMATTR Value {driver_Rfb}
SYMBOL res 8400 4416 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R12
SYMATTR Value {driver_Rin}
SYMBOL res 8400 4768 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R13
SYMATTR Value {driver_Rin}
SYMBOL cap 9904 4416 R0
SYMATTR InstName C8
SYMATTR Value 10µ
SYMBOL cap 9984 4416 R0
SYMATTR InstName C9
SYMATTR Value 0.1µ
SYMBOL cap 9120 3856 R0
SYMATTR InstName C11
SYMATTR Value 0.1µ
TEXT 5416 2976 Left 2 ;LTC6373 gain setting table, from datasheet:
TEXT 7856 3552 Left 2 ;Other signals
TEXT 5432 2392 Left 2 ;.tran 0 3.5m 0.25m
TEXT 5376 2336 Left 2 ;Simulation commands
TEXT 6568 2336 Left 2 ;Parameters
TEXT 5376 2928 Left 2 ;Comments
TEXT 5584 3552 Left 2 ;Supplies
TEXT 6592 2440 Left 2 !.param switch_VDD = 10V\n.param switch_VSS = -10V\n.param switch_Vlogic = 5V\n.param PGIA_Vp = 10V\n.param PGIA_Vn = -10V\n.param ADC_VDD = 5V\n.param driver_Vp = 4.5V\n.param driver_Vn = -0.5V\n.param reference_Vin = 5V
TEXT 5408 2160 Left 2 ;Release Date: 2022/11/25\nDescription: Precision, wide-bandwidth current or voltage measurement signal chain, optimized for power.\n For support, you can post your questions in https://ez.analog.com/design-tools-and-calculators/ltspice/ after you have created an account.
TEXT 5376 2096 Left 2 ;Simulation file notes
TEXT 5432 2440 Left 2 !.ac dec 100 100 1000MEG
TEXT 5432 2488 Left 2 ;.noise V(Vout) Vin_p dec 100 10 1000MEG
TEXT 6584 2880 Left 2 ;Signal filter (differential RC)
TEXT 6584 3152 Left 2 ;ADC
TEXT 6592 3184 Left 2 !.param fs = 1MEG\n.param ACQ_delay = 0.2m
TEXT 6592 2912 Left 2 !.param FilterCutoffFreq = 100k\n.param FilterResistor =  {driver_Rfb/2}\n.param FilterCapacitor={1/(2*PI*((driver_Rin*FilterResistor)/(driver_Rin+FilterResistor))*FilterCutoffFreq)}
TEXT 6592 3312 Left 2 !.param PGIA_Gain = 8
TEXT 6584 3280 Left 2 ;PGIA
TEXT 7072 2912 Left 2 ;--> Cut-off frequency (3dB)  for our first order RC filter
TEXT 7072 2936 Left 2 ;--> RC filter resistor value. See note in the schematic below!
TEXT 6928 3176 Left 2 ;--> ADC Sampling rate. For LT2387-18: min 20 ksps, max 15 Msps
TEXT 6928 3208 Left 2 ;--> Delay from simulation start to first sampling request (CNV rising edge) to the ADC
TEXT 6888 3312 Left 2 ;--> Instrumentation Op Amp gain. Valid values are 0 (shutdown), 0.25, 0.5, 1, 2, 4, 8, 16\n      See the auxiliary block to the right for how this number is translated into the gain configuration signals.
TEXT 6584 2408 Left 2 ;Power supplies
TEXT 6592 3376 Left 2 ;.step param PGIA_Gain list 0.25 0.5 1 2 4 8 16
TEXT 7152 3376 Left 2 ;--> Usage example of the step command for running consecutive simulations with different values for the PGA gain
TEXT 5584 4184 Left 2 ;Input signal
TEXT 6288 4192 Left 2 ;Protection switch
TEXT 6832 4192 Left 2 ;Gain
TEXT 7648 4168 Left 2 ;Filter
TEXT 8672 2768 Left 2 !.param A0_level=table({PGIA_gain},0, 5, 0.25, 0, 0.5,5, 1, 0, 2, 5, 4, 0, 8, 5, 16, 0)\n.param A1_level=table({PGIA_gain}, 0, 5, 0.25, 5, 0.5, 0, 1, 0, 2, 5, 4, 5, 8,0, 16, 0)\n.param A2_level=table({PGIA_gain},0, 5, 0.25, 5, 0.5,5, 1, 5, 2, 0, 4, 0, 8, 0, 16, 0)
TEXT 8624 2432 Left 2 ;LT6373 gain decode auxiliary block
TEXT 8672 2504 Left 2 ;This block is intended to facilitate controlling the gain of the LT6373 in this simulation through a single LTspice parameter ("PGIA_gain").\n \nThe "PGIA_gain" parameter is taken as input to decode it into the 3 logic control signals that set the gain of the LT6373.\nThis is done by using 3 parameters (one for each control bit) whose values are calculated through tables, and then fed to\nthe LT6373 via the 3 DC sources.\nA PGIA_gain parameter value of 0 is interpreted as the shutdown mode for the amplifier.\nNote that setting the PGIA_gain to any value other than the 8 possible ones makes no sense and will in turn cause senseless behavior of the digital\ncontrol signals (LTspice will interpolate/extrapolate values due to the decoding being implemented through the table function).
TEXT 6928 2440 Left 2 ;--> Supply span for protection switch ADG5421F must be between 8V and 44V, and can be\n      unipolar (so maximum unipolar is  0V to 44V) or bipolar (no need to be symmetrical).
TEXT 6872 2536 Left 2 ;--> LT6373 amplifier supply voltage range is from +-4.5V to +-18V
TEXT 6856 2584 Left 2 ;--> Supply voltage must be 5V for the LTC2387-18 ADC
TEXT 6880 2616 Left 2 ;--> Supply voltage for the ADA4945-1 driver: as low as possible for lowest power consumption, while leaving enough head- and footroom\n    to be able to reach ADC input max (4.096V) and min (0V) values
TEXT 6928 2672 Left 2 ;--> Reference input/supply: must be at least 0.5V above output, and maximum is 13.2V
TEXT 6952 2768 Left 2 ;--> Input signal amplitude (peak-to-peak)\n--> Frequency for the sinusoidal differential input signal\n--> Input signal common mode DC voltage
TEXT 6592 2768 Left 2 !.param input_Vpp = 1V\n.param input_freq = 1k\n.param input_cm = 1.25V
TEXT 6584 2736 Left 2 ;Input signal
TEXT 7680 4224 Left 2 ;Note that the filter resistor (R5, R6) value will\nset the low frequency gain of the FDA stage.\nAt the same time, the driver input resistor\n(R12, R13) value affects filter response.
TEXT 5496 3024 Left 2 ;A2
TEXT 5560 3024 Left 2 ;A1
TEXT 5624 3024 Left 2 ;A0
TEXT 5688 3024 Left 2 ;Gain (V/V)
TEXT 5504 3064 Left 2 ;L
TEXT 5704 3064 Left 2 ;16
TEXT 5632 3112 Left 2 ;H
TEXT 5712 3112 Left 2 ;8
TEXT 5712 3160 Left 2 ;4
TEXT 5712 3208 Left 2 ;2
TEXT 5712 3256 Left 2 ;1
TEXT 5712 3304 Left 2 ;0.5
TEXT 5712 3352 Left 2 ;0.25
TEXT 5688 3400 Left 2 ;shutdown
TEXT 5504 3112 Left 2 ;L
TEXT 5504 3160 Left 2 ;L
TEXT 5504 3208 Left 2 ;L
TEXT 5568 3112 Left 2 ;L
TEXT 5568 3064 Left 2 ;L
TEXT 5632 3064 Left 2 ;L
TEXT 5632 3160 Left 2 ;L
TEXT 5568 3256 Left 2 ;L
TEXT 5632 3256 Left 2 ;L
TEXT 5568 3304 Left 2 ;L
TEXT 5632 3352 Left 2 ;L
TEXT 5568 3160 Left 2 ;H
TEXT 5568 3208 Left 2 ;H
TEXT 5632 3208 Left 2 ;H
TEXT 5504 3256 Left 2 ;H
TEXT 5504 3304 Left 2 ;H
TEXT 5504 3352 Left 2 ;H
TEXT 5504 3400 Left 2 ;H
TEXT 5632 3304 Left 2 ;H
TEXT 5568 3352 Left 2 ;H
TEXT 5568 3400 Left 2 ;H
TEXT 5632 3400 Left 2 ;H
TEXT 7904 3848 Left 2 ;The CNV (convert) signal is a periodic train of pulses whose raising edges\ntrigger ADC conversion. The frequency of these pulses (fs) sets the\nsampling rate of the ADC.
TEXT 6904 2496 Left 2 ;--> Note that the control signal inputs for the switch have a maximum voltage of 6V
TEXT 6504 4968 Left 2 ;FF output is open drain
TEXT 5896 3208 Left 2 ;The generation of A0, A1 and A2 signals as per\nthis table is implemented in the" LT6373 gain\ndecode auxiliary block" to the right
TEXT 5376 2576 Left 2 ;Simulation convergence/speed aid commands
TEXT 5400 2624 Left 2 !.option noopiter\n.option gminsteps=0
TEXT 5400 2712 Left 2 !.nodeset V(reference_Vin) =5V V(refbuf)=4.096V
TEXT 5680 2624 Left 2 ;Skip direct Newton method for DC op point, to save time because it fails.
TEXT 5680 2656 Left 2 ;Skip gmin stepping method for DC op point, to save time because it fails.
TEXT 5400 2744 Left 2 !.nodeset V(PGIA_in_p) ={input_cm} V(PGIA_in_n)= {input_cm}
TEXT 8928 3696 Left 2 ;Voltage Reference
TEXT 8904 4200 Left 2 ;Normally the driver VOCM pin would be\ndriven by the LTC2387-18 Vcm output\n(2.048V nominally), but that pin is not\nincluded in the ADC's LTspice model.
TEXT 6584 3024 Left 2 ;Driver stage
TEXT 6592 3056 Left 2 !.param driver_Rin = {FilterResistor}\n.param driver_Rfb = 499
TEXT 7032 3056 Left 2 ;--> This condition, along with FilterResistor being driver_Rfb/2 sets the gain of filter+driver to 1
TEXT 8272 4064 Left 2 ;Driver
TEXT 9536 4208 Left 2 ;ADC
TEXT 8280 4104 Left 2 ;The RC filter component values of 24.9Ohm and 82pf are the recommendation\nfrom the LTC2387-18 datasheet.
TEXT 5400 2856 Left 2 !.option method=gear
TEXT 5680 2856 Left 2 ;Gear integration method is faster for this particular circuit
TEXT 5400 2776 Left 2 !.nodeset V(PGIA_out_p) =2.048 V(PGIA_out_n)=2.048
TEXT 5400 2808 Left 2 !.nodeset V(driver_out_p) =2.048 V(driver_out_m)=2.048
TEXT 6344 2736 Center 2 ;Nodeset provides an initial\nhint for DC op point\ncalculation
LINE Normal 5536 3424 5536 3008
LINE Normal 5600 3424 5600 3008
LINE Normal 5664 3424 5664 3008
LINE Normal 5472 3040 5808 3040
LINE Normal 5472 3088 5808 3088
LINE Normal 5472 3136 5808 3136
LINE Normal 5472 3184 5808 3184
LINE Normal 5472 3232 5808 3232
LINE Normal 5472 3280 5808 3280
LINE Normal 5472 3328 5808 3328
LINE Normal 5472 3376 5808 3376
RECTANGLE Normal 8800 3952 7856 3568 2
RECTANGLE Normal 8544 3440 6544 2352 2
RECTANGLE Normal 6528 2544 5376 2352 2
RECTANGLE Normal 6528 3440 5376 2944 2
RECTANGLE Normal 7792 3952 5584 3568 2
RECTANGLE Normal 8544 2304 5376 2112 2
RECTANGLE Normal 6256 5040 5584 4208 2
RECTANGLE Normal 6800 5040 6288 4208 2
RECTANGLE Normal 7616 5040 6832 4208 2
RECTANGLE Normal 8464 5040 7648 4192 2
RECTANGLE Normal 10368 3072 8624 2464 2
RECTANGLE Normal 6528 2896 5376 2592 2
RECTANGLE Normal 8928 3712 9728 4000 2
RECTANGLE Normal 9424 5088 8256 4080 2
RECTANGLE Normal 10192 5024 9536 4224 2
