* Z:\home\khalils\Downloads\files\data\raw_asc\AD4080.asc
* Generated by LTspice 26.0.1 for Windows.
* External voltage reference
* .tran 5u
* .noise V(ADC_out_dsp) Vin_p dec 100 10 1G
* Fully differential ADC driver
* ADC Kickback Filter
* Set to ~80 MHz BW to allow\ndriver to settle ADC kickback.
* .ac dec 1000 1k 1G
* AD4080 Digital Filtering Configuration
* ADC output pre-digital filtering
* ADC output post digital filtering (AC and NOISE simulations only)
* SEL input:\n The voltage applied at this input selects the\n digital filter type.\n 0V = No Filter \n 1V = Sinc1 \n 2V = Sinc5\n 3V = Sinc5 + Comp
* DEC input:\n The voltage applied at this pin sets\n the N value for decimation.\n For Sinc1 and Sinc5 Filters Decimation = N\n For Sinc5 +Comp Decimation = (N * 2)\n 2 = N = 2 \n 4 = N = 4 \n 8 = N = 8\n 16 =........\n ...............\n 256 = N = 256 (Max Setting for Sinc5 and Sinc5 + Comp)\n 512 = N = 512 (Sinc1 Only)\n 1024 = N = 1024 (Sinc1 Only)
* Multi-feedback topology, low-pass, second-order
* --> AD4080 digital filter output (ADC_out_dsp)\n does not support transient simulations
* Other signals
* Simulation commands
* Measurements
* Supplies
* AUX input filter
* FS input:\n A voltage equal to the sampling frequency in Hertz\n must be supplied at this input.
* Results can be found in the "SPICE Output Log" (View->"Spice Output Log" or Ctrl+L").
* 3dB bandwidth (AC analysis)
* Noise parameters: dynamic range and ENOB (NOISE analysis)
* --> Noise simulation with output BEFORE digital filtering (ADC_out)
* --> Noise simulation with output AFTER digital filtering (ADC_out_DSP)
* Input signal
* The default configuration (sel=3, decimation=4, fs=40MHz) results in a \nSinc5 + Compensation filter with a 3dB bandwidth of ~2MHz.
* --> SNR
* AD4080 must be used with an external 3V reference.\nThis parameter is used in the Dynamic Range calculations.
* --> ADC Sampling rate. For AD4080 min is 1.25 Msps, max 40 Msps
* --> Delay from simulation start to first sampling pulse
* Convert signal
* Default settings:\n Gain = 1\n 3dB BW = ~2.5 MHz.
* Datasheet recommended values
* Library below included based on ModelFile attribute of instance XU1 (C:\users\khalils\AppData\Local\LTspice\lib\sym\ADC\AD4080.asy)
* Library below included based on ModelFile attribute of instance XU2 (C:\users\khalils\AppData\Local\LTspice\lib\sym\OpAmps\ADA4945-HP.asy)
V15 CNV 0 PULSE(0 1.1 {ACQ_delay} 0.2n 0.2n {0.9*(1/fs)} {1/fs})
V_SEL1 N008 0 {sel}
Vin_n N003 Vin_n SINE(0 {input_Vpp/4} {input_freq}) AC 0.5 0
C9 0 ADC_out 0.1p
C10 0 ADC_out_dsp 0.1p
XU1 0 VDD33 Refin ADC_IN+ ADC_IN- AUXIN+ AUXIN- CNV ADC_out ADC_out_dsp N007 N008 N006 ADC_out AD4080 ;pnba GND)Vdd)REFIN)IN+)IN-)AUXIN+)AUXIN-)CNV)Vout)DSPOUT)DEC)SEL)FS)DSPIN
R7 N001 Vin_p {RG}
C12 FDA_IN- N004 {CFilt_2}
R8 N005 Vin_n {RG}
V_DEC1 N007 0 {decimation}
R5 N001 N002 {RF}
V4 Refin 0 {VREF}
C14 0 N005 {CFilt_1}
C11 FDA_IN+ N002 {CFilt_2}
Vin_p Vin_p N003 SINE(0 {input_Vpp/4} {input_freq}) AC 0.5 0
R20 N005 FDA_IN- {RMFB}
R19 N001 FDA_IN+ {RMFB}
C16 AUXIN+ AUXIN- 10p
R15 ADC_IN+ FDA_OUT_P 25
C13 N001 0 {CFilt_1}
R18 AUXIN- FDA_OUT_N 100
R17 AUXIN+ FDA_OUT_P 100
V6 VS+ 0 5
Vin_cm N003 0 {input_cm} AC 0
V7 VS- 0 -5
C15 ADC_IN+ ADC_IN- 39p
V2 _DIS 0 3.3
R6 N005 N004 {RF}
V_FS1 N006 0 {fs}
XU2 N002 FDA_IN+ FDA_IN- N004 VS+ VS- FDA_OUT_N FDA_OUT_P _DIS VOCM VREF 0 0 ADA4945-HP ;pnba 1)2)3)4)5)6)7)8)9)10)11)12)13
V14 VDD33 0 3.3
R16 ADC_IN- FDA_OUT_N 25
V1 VOCM 0 1.5
.param VREF=3
.meas NOISE output_noise_rms INTEG V(onoise) FROM 10 TO {Fmax_noise_integration}
.meas NOISE full_scale_sine_rms PARAM 2*VREF/(2*sqrt(2))
.meas NOISE dynamic_range PARAM 20*log10(full_scale_sine_rms/output_noise_rms)
.param Fmax_noise_integration = 1G
.meas NOISE ENOB PARAM (dynamic_range - 1.76)/6.02
.noise V(ADC_out) Vin_p dec 100 10 1G
.param decimation 4
.meas AC ADC_out_max MAX MAG(V(ADC_out))
.meas AC bw_3db FIND frequency WHEN mag(V(ADC_out))=(ADC_out_max/sqrt(2))
.param sel 3
.param input_Vpp=2.966
.param input_freq = 500k
.param input_cm = 0
.param fs = 40MEG
.param ACQ_delay = 10n
.param AFE_gain = 1 ;--> AFE gain = Rf/Rg
.param RF = 499
.param RMFB = 499
.param RG = {RF/AFE_gain}
.param CFilt_1=150p
.param CFilt_2=56p
.lib AD4080.sub
.lib ADA4945-HP.sub
.backanno
.end

* LTspice schematic (.asc):
Version 4
SHEET 1 12976 5604
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LINE Normal 5904 4560 5904 4560 2
RECTANGLE Normal 5504 4080 4768 3792 2
RECTANGLE Normal 4272 4640 3920 3968 2
RECTANGLE Normal 5232 3632 4784 3344 2
RECTANGLE Normal 3280 3504 1808 3280 2
RECTANGLE Normal 3296 5392 1824 4928 2
RECTANGLE Normal 4704 3632 3984 3344 2
RECTANGLE Normal 2560 4816 1824 3920 2
RECTANGLE Normal 4688 4640 4320 4128 2
RECTANGLE Normal 6880 4144 5552 3792 2
RECTANGLE Normal 3808 4816 2592 3600 2
RECTANGLE Normal 5792 5504 4176 4768 2
RECTANGLE Normal 5760 5168 4912 5008 2
SYMBOL res 3024 4256 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R19
SYMATTR Value {RMFB}
SYMBOL res 4560 4240 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R17
SYMATTR Value 100
SYMBOL voltage 2096 4416 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 cap 4560 4400 R0
SYMATTR InstName C16
SYMATTR Value 10p
SYMBOL OpAmps\\ADA4945-HP 3456 4416 R0
WINDOW 3 73 92 Left 2
SYMATTR InstName U2
SYMBOL voltage 4480 3440 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V14
SYMATTR Value 3.3
SYMBOL voltage 4272 3440 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V7
SYMATTR Value -5
SYMBOL cap 2896 4448 R0
WINDOW 3 17 49 Left 2
WINDOW 0 32 11 Left 2
SYMATTR Value {CFilt_1}
SYMATTR InstName C14
SYMBOL cap 2896 4288 R0
WINDOW 3 18 56 Left 2
WINDOW 0 32 13 Left 2
SYMATTR Value {CFilt_1}
SYMATTR InstName C13
SYMBOL cap 4128 4384 R0
SYMATTR InstName C15
SYMATTR Value 39p
SYMBOL voltage 5104 3424 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value 3.3
SYMBOL voltage 5744 3920 R0
WINDOW 123 0 0 Left 0
WINDOW 39 36 120 Left 2
WINDOW 3 13 96 Left 2
SYMATTR Value PULSE(0 1.1 {ACQ_delay} 0.2n 0.2n {0.9*(1/fs)} {1/fs})
SYMATTR InstName V15
SYMBOL cap 5728 4608 M180
WINDOW 0 24 56 Left 2
WINDOW 3 24 8 Left 2
SYMATTR InstName C10
SYMATTR Value 0.1p
SYMBOL voltage 2096 4256 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 res 4096 4336 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R15
SYMATTR Value 25
SYMBOL res 3136 4032 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R5
SYMATTR Value {RF}
SYMBOL res 2848 4544 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R8
SYMATTR Value {RG}
SYMBOL res 3024 4576 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R20
SYMATTR Value {RMFB}
SYMBOL res 4560 4560 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R18
SYMATTR Value 100
SYMBOL cap 3280 4128 R270
WINDOW 3 0 32 VBottom 2
WINDOW 0 32 32 VTop 2
SYMATTR Value {CFilt_2}
SYMATTR InstName C11
SYMBOL voltage 4976 4832 M0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
WINDOW 0 -86 14 Left 2
WINDOW 3 -80 45 Left 2
SYMATTR InstName V_FS1
SYMATTR Value {fs}
SYMBOL cap 5728 4368 M180
WINDOW 0 24 56 Left 2
WINDOW 3 24 8 Left 2
SYMATTR InstName C9
SYMATTR Value 0.1p
SYMBOL cap 3280 4704 R270
WINDOW 3 0 32 VBottom 2
WINDOW 0 32 32 VTop 2
SYMATTR Value {CFilt_2}
SYMATTR InstName C12
SYMBOL ADC\\AD4080 5072 4384 R0
SYMATTR InstName U1
SYMBOL voltage 4832 3424 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 1.5
SYMBOL res 4096 4464 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R16
SYMATTR Value 25
SYMBOL voltage 4048 3440 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V6
SYMATTR Value 5
SYMBOL voltage 5296 4832 M0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
WINDOW 0 -102 20 Left 2
WINDOW 3 -198 51 Left 2
SYMATTR InstName V_DEC1
SYMATTR Value {decimation}
SYMBOL voltage 1888 4416 R0
WINDOW 123 41 74 Left 2
WINDOW 39 0 0 Left 0
WINDOW 0 42 49 Left 2
WINDOW 3 30 98 Left 2
SYMATTR Value2 AC 0
SYMATTR InstName Vin_cm
SYMATTR Value {input_cm}
SYMBOL voltage 5168 3936 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V4
SYMATTR Value {VREF}
SYMBOL voltage 5136 4832 M0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
WINDOW 0 -102 15 Left 2
WINDOW 3 -96 50 Left 2
SYMATTR InstName V_SEL1
SYMATTR Value {sel}
SYMBOL res 3152 4784 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R6
SYMATTR Value {RF}
SYMBOL res 2848 4224 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R7
SYMATTR Value {RG}
FLAG 5168 4048 0
FLAG 4976 4560 0
FLAG 5744 4400 0
FLAG 5744 4640 0
FLAG 5840 4272 ADC_out
FLAG 5824 4512 ADC_out_dsp
FLAG 4832 3552 0
FLAG 4848 3392 VOCM
FLAG 5104 3552 0
FLAG 5120 3392 _DIS
FLAG 4752 4256 AUXIN+
FLAG 4752 4352 ADC_IN+
FLAG 4752 4480 ADC_IN-
FLAG 4752 4576 AUXIN-
FLAG 4976 4944 0
FLAG 5136 4944 0
FLAG 5296 4944 0
FLAG 4048 3568 0
FLAG 4272 3568 0
FLAG 4064 3408 VS+
FLAG 4288 3408 VS-
FLAG 4480 3568 0
FLAG 4496 3408 VDD33
FLAG 5744 4048 0
FLAG 5664 3904 CNV
FLAG 5424 4208 VDD33
FLAG 5072 4192 Refin
FLAG 3536 4272 VOCM
FLAG 3536 4240 VS+
FLAG 3504 4608 VS-
FLAG 3360 4528 0
FLAG 3504 4576 _DIS
FLAG 3280 4352 FDA_IN+
FLAG 3280 4416 FDA_IN-
FLAG 3520 4528 0
FLAG 3536 4304 VREF
FLAG 3696 4352 FDA_OUT_N
FLAG 3696 4480 FDA_OUT_P
FLAG 1888 4560 0
FLAG 2144 4240 Vin_p
FLAG 2144 4560 Vin_n
FLAG 2864 4416 0
TEXT 4800 3912 Left 2 !.param VREF=3
TEXT 4768 3768 Left 4 ;External voltage reference
TEXT 1840 3320 Left 2 ;.tran 5u
TEXT 1840 3440 Left 2 ;.noise V(ADC_out_dsp) Vin_p dec 100 10 1G
TEXT 1864 5208 Left 2 !.meas NOISE output_noise_rms INTEG V(onoise) FROM 10 TO {Fmax_noise_integration}
TEXT 1864 5248 Left 2 !.meas NOISE full_scale_sine_rms PARAM 2*VREF/(2*sqrt(2))
TEXT 1864 5288 Left 2 !.meas NOISE dynamic_range PARAM 20*log10(full_scale_sine_rms/output_noise_rms)
TEXT 1864 5168 Left 2 !.param Fmax_noise_integration = 1G
TEXT 1864 5328 Left 2 !.meas NOISE ENOB PARAM (dynamic_range - 1.76)/6.02
TEXT 2600 3576 Left 4 ;Fully differential ADC driver
TEXT 3920 3944 Left 4 ;ADC Kickback Filter
TEXT 3944 3992 Left 2 ;Set to ~80 MHz BW to allow\ndriver to settle ADC kickback.
TEXT 1840 3360 Left 2 ;.ac dec 1000 1k 1G
TEXT 1840 3400 Left 2 !.noise V(ADC_out) Vin_p dec 100 10 1G
TEXT 4176 4744 Left 4 ;AD4080 Digital Filtering Configuration
TEXT 5664 4232 Left 4 ;ADC output pre-digital filtering
TEXT 5656 4472 Left 4 ;ADC output post digital filtering (AC and NOISE simulations only)
TEXT 4224 4912 Left 2 ;SEL input:\n  The voltage applied at this input selects the\n  digital filter type.\n    0V = No Filter \n    1V = Sinc1 \n    2V = Sinc5\n    3V = Sinc5 + Comp
TEXT 4224 5144 Left 2 ;DEC input:\n  The voltage applied at this pin sets\n  the N value for decimation.\n  For Sinc1 and Sinc5 Filters Decimation = N\n  For Sinc5 +Comp Decimation = (N * 2)\n  2 = N = 2 \n  4 = N = 4 \n  8 = N = 8\n  16 =........\n  ...............\n  256 =   N = 256 (Max Setting for Sinc5 and Sinc5 + Comp)\n  512 =   N = 512 (Sinc1 Only)\n  1024 = N = 1024 (Sinc1 Only)
TEXT 2600 3624 Left 3 ;Multi-feedback topology, low-pass, second-order
TEXT 2408 3320 Left 2 ;--> AD4080 digital filter output (ADC_out_dsp)\n     does not support transient simulations
TEXT 4784 3328 Left 2 ;Other signals
TEXT 1808 3264 Left 2 ;Simulation commands
TEXT 1824 4912 Left 2 ;Measurements
TEXT 3984 3328 Left 2 ;Supplies
TEXT 4392 4112 Left 3 ;AUX input filter
TEXT 4224 4800 Left 2 ;FS input:\n  A voltage equal to the sampling frequency in Hertz\n  must be supplied at this input.
TEXT 1848 4960 Left 2 ;Results can be found in the "SPICE Output Log" (View->"Spice Output Log" or Ctrl+L").
TEXT 1848 5016 Left 2 ;3dB bandwidth (AC analysis)
TEXT 1840 5128 Left 2 ;Noise parameters: dynamic range and ENOB (NOISE analysis)
TEXT 2408 3400 Left 2 ;--> Noise simulation with output BEFORE digital filtering (ADC_out)
TEXT 2408 3440 Left 2 ;--> Noise simulation with output AFTER digital filtering (ADC_out_DSP)
TEXT 4920 5128 Left 2 !.param decimation 4
TEXT 1832 3896 Left 4 ;Input signal
TEXT 1864 5048 Left 2 !.meas AC ADC_out_max MAX MAG(V(ADC_out))
TEXT 1864 5080 Left 2 !.meas AC bw_3db FIND frequency WHEN mag(V(ADC_out))=(ADC_out_max/sqrt(2))
TEXT 4920 5096 Left 2 !.param sel 3
TEXT 4920 5032 Left 2 ;The default configuration (sel=3, decimation=4, fs=40MHz) results in a \nSinc5 + Compensation filter with a 3dB bandwidth of ~2MHz.
TEXT 2976 5288 Left 2 ;--> SNR
TEXT 4792 3848 Left 2 ;AD4080 must be used with an external 3V reference.\nThis parameter is used in the Dynamic Range calculations.
TEXT 1856 3952 Left 2 !.param input_Vpp=2.966\n.param input_freq = 500k\n.param input_cm = 0
TEXT 5760 4080 Left 2 !.param fs = 40MEG\n.param ACQ_delay = 10n
TEXT 6096 4072 Left 2 ;--> ADC Sampling rate. For AD4080 min is 1.25 Msps, max 40 Msps
TEXT 6096 4104 Left 2 ;--> Delay from simulation start to first sampling pulse
TEXT 5544 3768 Left 4 ;Convert signal
TEXT 2648 3784 Left 2 !.param AFE_gain = 1 ;--> AFE gain = Rf/Rg\n.param RF = 499\n.param RMFB = 499\n.param RG = {RF/AFE_gain}\n.param CFilt_1=150p\n.param CFilt_2=56p
TEXT 2648 3664 Left 2 ;Default settings:\n  Gain = 1\n  3dB BW = ~2.5 MHz.
TEXT 4344 4144 Left 2 ;Datasheet recommended values