polymer-strain-amp/channel2.sch

EESchema Schematic File Version 2
LIBS:power
LIBS:device
LIBS:transistors
LIBS:conn
LIBS:linear
LIBS:regul
LIBS:74xx
LIBS:cmos4000
LIBS:adc-dac
LIBS:memory
LIBS:xilinx
LIBS:microcontrollers
LIBS:dsp
LIBS:microchip
LIBS:analog_switches
LIBS:motorola
LIBS:texas
LIBS:intel
LIBS:audio
LIBS:interface
LIBS:digital-audio
LIBS:philips
LIBS:display
LIBS:cypress
LIBS:siliconi
LIBS:opto
LIBS:atmel
LIBS:contrib
LIBS:valves
LIBS:nocko
LIBS:bmi-8ch-cache
EELAYER 25 0
EELAYER END
$Descr USLetter 11000 8500
encoding utf-8
Sheet 3 5
Title "Input Channel 0 & 1"
Date "2017-03-26"
Rev "AB"
Comp "Monadnock Systems"
Comment1 ""
Comment2 ""
Comment3 ""
Comment4 ""
$EndDescr
$Comp
L R R306
U 1 1 58D98307
P 1400 1800
F 0 "R306" V 1480 1800 50  0000 C CNN
F 1 "2M" V 1400 1800 50  0000 C CNN
F 2 "Resistors_SMD:R_0603_HandSoldering" V 1330 1800 50  0001 C CNN
F 3 "" H 1400 1800 50  0001 C CNN
	1    1400 1800
	1    0    0    -1  
$EndComp
$Comp
L R R307
U 1 1 58D98308
P 1750 1800
F 0 "R307" V 1830 1800 50  0000 C CNN
F 1 "2M" V 1750 1800 50  0000 C CNN
F 2 "Resistors_SMD:R_0603_HandSoldering" V 1680 1800 50  0001 C CNN
F 3 "" H 1750 1800 50  0001 C CNN
	1    1750 1800
	1    0    0    -1  
$EndComp
$Comp
L R R301
U 1 1 58D98309
P 1750 1200
F 0 "R301" V 1830 1200 50  0000 C CNN
F 1 "2M" V 1750 1200 50  0000 C CNN
F 2 "Resistors_SMD:R_0603_HandSoldering" V 1680 1200 50  0001 C CNN
F 3 "" H 1750 1200 50  0001 C CNN
	1    1750 1200
	1    0    0    -1  
$EndComp
$Comp
L CONN_01X02 J301
U 1 1 58D9830A
P 900 1200
F 0 "J301" H 900 1350 50  0000 C CNN
F 1 "Sensor 2" V 1000 1200 50  0000 C CNN
F 2 "nocko:TerminalBlock_Pheonix_PT-5mm_2pol" H 900 1200 50  0001 C CNN
F 3 "" H 900 1200 50  0001 C CNN
	1    900  1200
	-1   0    0    -1  
$EndComp
$Comp
L C C306
U 1 1 58D9830B
P 2200 1400
F 0 "C306" V 2250 1450 50  0000 L CNN
F 1 "1µF" V 2050 1300 50  0000 L CNN
F 2 "Capacitors_SMD:C_0603_HandSoldering" H 2238 1250 50  0001 C CNN
F 3 "" H 2200 1400 50  0001 C CNN
	1    2200 1400
	0    1    1    0   
$EndComp
$Comp
L C C308
U 1 1 58D9830C
P 2200 1800
F 0 "C308" V 2150 1850 50  0000 L CNN
F 1 "1µF" V 2350 1700 50  0000 L CNN
F 2 "Capacitors_SMD:C_0603_HandSoldering" H 2238 1650 50  0001 C CNN
F 3 "" H 2200 1800 50  0001 C CNN
	1    2200 1800
	0    1    1    0   
$EndComp
Text Notes 1950 1000 0    60   ~ 0
Optional AC Coupling\n3dB down @ 0.4Hz
$Comp
L C C307
U 1 1 58D9830D
P 6250 1750
F 0 "C307" H 6275 1850 50  0000 L CNN
F 1 "910pF" H 6150 1650 50  0000 L CNN
F 2 "Capacitors_SMD:C_0603_HandSoldering" H 6288 1600 50  0001 C CNN
F 3 "" H 6250 1750 50  0001 C CNN
	1    6250 1750
	1    0    0    -1  
$EndComp
$Comp
L C C305
U 1 1 58D9830E
P 6600 1150
F 0 "C305" V 6550 1200 50  0000 L CNN
F 1 "9.1nF" V 6650 1200 50  0000 L CNN
F 2 "Capacitors_SMD:C_0603_HandSoldering" H 6638 1000 50  0001 C CNN
F 3 "" H 6600 1150 50  0001 C CNN
	1    6600 1150
	0    1    1    0   
$EndComp
$Comp
L R R305
U 1 1 58D9830F
P 6000 1600
F 0 "R305" V 6080 1600 50  0000 C CNN
F 1 "1.78M" V 6000 1600 39  0000 C CNN
F 2 "Resistors_SMD:R_0603_HandSoldering" V 5930 1600 50  0001 C CNN
F 3 "" H 6000 1600 50  0001 C CNN
	1    6000 1600
	0    1    1    0   
$EndComp
$Comp
L R R304
U 1 1 58D98310
P 5600 1600
F 0 "R304" V 5680 1600 50  0000 C CNN
F 1 "57.6k" V 5600 1600 50  0000 C CNN
F 2 "Resistors_SMD:R_0603_HandSoldering" V 5530 1600 50  0001 C CNN
F 3 "" H 5600 1600 50  0001 C CNN
	1    5600 1600
	0    1    1    0   
$EndComp
Text Notes 750  5450 0    87   ~ 0
Notes:\nDesigned for +-Vbatt/2 Output (INA is only gain element)\nMay damage ADC if input range is <= +-VBATT/2\n\nR204, R213: 0.1%\nR208, R209: 1%\nR202, R205, R206 & R203, R207: Metal Foil / Thin Film (Resistor packs preferred)\nALL C: 5%, 16V
$Comp
L R R308
U 1 1 58D98311
P 2500 1800
F 0 "R308" V 2580 1800 50  0000 C CNN
F 1 "390k" V 2500 1800 50  0000 C CNN
F 2 "Resistors_SMD:R_0603_HandSoldering" V 2430 1800 50  0001 C CNN
F 3 "" H 2500 1800 50  0001 C CNN
	1    2500 1800
	1    0    0    -1  
$EndComp
$Comp
L R R302
U 1 1 58D98312
P 2500 1400
F 0 "R302" V 2580 1400 50  0000 C CNN
F 1 "390k" V 2500 1400 50  0000 C CNN
F 2 "Resistors_SMD:R_0603_HandSoldering" V 2430 1400 50  0001 C CNN
F 3 "" H 2500 1400 50  0001 C CNN
	1    2500 1400
	1    0    0    -1  
$EndComp
$Comp
L C C303
U 1 1 58D98313
P 9900 1000
F 0 "C303" H 9925 1100 50  0000 L CNN
F 1 "0.1μF" H 9925 900 50  0000 L CNN
F 2 "Capacitors_SMD:C_0603_HandSoldering" H 9938 850 50  0001 C CNN
F 3 "" H 9900 1000 50  0001 C CNN
	1    9900 1000
	1    0    0    -1  
$EndComp
Text Notes 5300 2450 0    60   ~ 0
Chebyshev (0.26dB)\nGain = 2V/V\n-3dB @ 195Hz\n-50dB @ 3.1kHz
$Comp
L AD8227 U301
U 1 1 58D98314
P 3250 1600
F 0 "U301" H 3400 1725 50  0000 L CNN
F 1 "AD8227" H 3400 1475 50  0000 L CNN
F 2 "Housings_SSOP:MSOP-8_3x3mm_Pitch0.65mm" H 3350 1600 50  0001 C CNN
F 3 "" H 3350 1600 50  0001 C CNN
	1    3250 1600
	1    0    0    -1  
$EndComp
$Comp
L R_Small R303
U 1 1 58D98315
P 2850 1600
F 0 "R303" V 2900 1500 50  0000 L CNN
F 1 "8k" V 2850 1580 31  0000 L CNN
F 2 "Resistors_SMD:R_0603_HandSoldering" H 2850 1600 50  0001 C CNN
F 3 "" H 2850 1600 50  0001 C CNN
	1    2850 1600
	1    0    0    -1  
$EndComp
Text Notes 2750 1450 0    39   ~ 0
G=15
Wire Wire Line
	1100 1250 1400 1250
Wire Wire Line
	1100 1150 1100 1050
Wire Wire Line
	1100 1050 1750 1050
Connection ~ 1600 1050
Wire Wire Line
	1400 1950 1750 1950
Wire Wire Line
	1600 1950 1600 1950
Connection ~ 1600 1950
Wire Wire Line
	1750 1350 1750 1650
Wire Wire Line
	1900 1500 1900 1800
Wire Notes Line
	2050 1100 2700 1100
Wire Wire Line
	6650 1800 6500 1800
Wire Wire Line
	6500 1800 6500 2200
Wire Wire Line
	7600 1150 7600 1700
Wire Wire Line
	7250 1700 9000 1700
Wire Wire Line
	5750 1600 5850 1600
Wire Wire Line
	6150 1600 6650 1600
Connection ~ 6250 1600
Wire Wire Line
	5800 1600 5800 1150
Wire Wire Line
	5800 1150 6450 1150
Connection ~ 5800 1600
Wire Wire Line
	7600 1150 6750 1150
Connection ~ 7600 1700
Wire Notes Line
	5250 1000 8350 1000
Wire Notes Line
	8350 1000 8350 2450
Wire Notes Line
	5250 2450 5250 1000
Wire Wire Line
	6500 2200 7600 2200
Wire Wire Line
	2350 1250 2750 1250
Wire Wire Line
	2350 1250 2350 1400
Connection ~ 2500 1250
Wire Wire Line
	2350 1800 2350 1950
Wire Wire Line
	2500 1550 2500 1650
Wire Wire Line
	2400 1600 2500 1600
Connection ~ 2500 1600
Wire Wire Line
	1900 1800 2050 1800
Wire Wire Line
	2350 1950 2750 1950
Connection ~ 2500 1950
Wire Notes Line
	2050 2100 2700 2100
Wire Notes Line
	2700 2100 2700 1100
Wire Notes Line
	2050 1100 2050 2100
Connection ~ 9900 1150
Connection ~ 9900 850 
Wire Notes Line
	8350 2450 5250 2450
Wire Wire Line
	3600 1900 3350 1900
Wire Wire Line
	2750 1250 2950 1400
Wire Wire Line
	2750 1950 2950 1800
Wire Wire Line
	3650 1600 5450 1600
Wire Wire Line
	2950 1500 2850 1500
Wire Wire Line
	2950 1700 2850 1700
Connection ~ 1750 1500
Wire Wire Line
	1750 1500 1900 1500
Text Notes 1950 1050 0    39   ~ 0
When DC coupled, sensor failure grounds output.
Text Notes 2750 2350 0    39   ~ 0
CMRR: >95dB\nVoltage Noise Density @ G=15: <23.5nV/√Hz\nVoltage Noise (0.1-10Hz): < 0.8μV p-p\nSupply Current: <425μA
Text Notes 7200 2450 0    39   ~ 0
Offset: <125uV\nOffset Drift: <1.3uv/°C\nVoltage Noise Density: 12nV/√Hz\nVoltage Noise (0.1-10Hz): 0.2μV p-p\nSupply Current: <250μA
Text Notes 7650 1100 0    60   ~ 0
Antialias Filter
$Comp
L C C304
U 1 1 58D98316
P 10150 1000
F 0 "C304" H 10175 1100 50  0000 L CNN
F 1 "10μF" H 10175 900 50  0000 L CNN
F 2 "Capacitors_SMD:C_0603_HandSoldering" H 10188 850 50  0001 C CNN
F 3 "" H 10150 1000 50  0001 C CNN
	1    10150 1000
	1    0    0    -1  
$EndComp
Wire Wire Line
	9420 1150 10150 1150
Wire Wire Line
	9420 850  10150 850 
Text Notes 6950 5250 0    60   ~ 0
Assumptions:\n - (Initial) DAQ is MCC USB-1208FS (available at BMI)\n     11-bit, max 6250 S/sec for each channel; sequential\n - Target Bandwidth: 195Hz\n - Sampling Rate 6240 S/s\n - Sensor resistance ~2MΩ\n - Respiration motion changes sensor resistance by < -+10%
Text Notes 7000 6400 0    60   ~ 0
Analysis Notes:\n\n  1. Steep digital filter 0.4-175Hz\n    - Respiration typically 0.25-0.33Hz\n    - Narrower useful bandwidth likely, modeling needed.\n\n  2. Correct for temporal offset of sample due to sequential sampling.\n\n  3. 2x decimation for 13-bit (ENOB) and noise reduction
Text Notes 750  7750 0    60   ~ 0
Open Questions:\n\n1. Trimming the bridge.\n  - Only makes sense w/ DC coupling\n  - Bad tempco\n  - Bad UX\n  - Needed for significant gain\n\n2. AC vs DC Coupling; both have advantages: AC is easier\n\n3. Reducing R202,R203,R206,R207 to decrease Johnson noise: Probably useless.\n  - Changing R202,R206 may break INAMP CMRR\n\n4. Use chopper amps in signal path: Probably bad\n  - Lower total noise for *extremely* small bandwidths (<5Hz?)\n  - Lower offset (if DC coupled)\n\n5. Driven shields for output: Probably useless\n  - Reduce error due to leakage current\n  - No analysis done to determine if this is significant\n  - Current DAQ isn't likely to benefit
$Comp
L C C302
U 1 1 58D98317
P 9650 1000
F 0 "C302" H 9675 1100 50  0000 L CNN
F 1 "0.1μF" H 9675 900 50  0000 L CNN
F 2 "Capacitors_SMD:C_0603_HandSoldering" H 9688 850 50  0001 C CNN
F 3 "" H 9650 1000 50  0001 C CNN
	1    9650 1000
	1    0    0    -1  
$EndComp
Text Notes 2930 6120 0    60   ~ 0
Problems:\n\n  - USB-1208FS has fixed single-ended range of +- 10V\n    - Reduces ENOB to 11 if running on 5V supply\n    - Drop in upgrade to USB-1608FS (16bit and variable range)\n    - Can be substantially mitigated initially by running on 18V via two 9V batteries.
Text HLabel 9000 1700 2    60   Output ~ 0
Channel2
$Comp
L TEST_1P J302
U 1 1 58D98318
P 4400 1600
F 0 "J302" H 4400 1870 50  0000 C CNN
F 1 "INA_OUT2" H 4400 1800 50  0000 C CNN
F 2 "Measurement_Points:Measurement_Point_Square-SMD-Pad_Small" H 4600 1600 50  0001 C CNN
F 3 "" H 4600 1600 50  0001 C CNN
	1    4400 1600
	1    0    0    -1  
$EndComp
$Comp
L TEST_1P J303
U 1 1 58D98319
P 8650 1700
F 0 "J303" H 8650 1970 50  0000 C CNN
F 1 "OUT2" H 8650 1900 50  0000 C CNN
F 2 "Measurement_Points:Measurement_Point_Round-SMD-Pad_Small" H 8850 1700 50  0001 C CNN
F 3 "" H 8850 1700 50  0001 C CNN
	1    8650 1700
	1    0    0    -1  
$EndComp
Connection ~ 4400 1600
Connection ~ 8650 1700
$Comp
L V+ #PWR038
U 1 1 58D9831A
P 3250 1300
F 0 "#PWR038" H 3250 1150 50  0001 C CNN
F 1 "V+" H 3250 1440 50  0000 C CNN
F 2 "" H 3250 1300 50  0000 C CNN
F 3 "" H 3250 1300 50  0000 C CNN
	1    3250 1300
	1    0    0    -1  
$EndComp
$Comp
L V- #PWR039
U 1 1 58D9831B
P 3250 1900
F 0 "#PWR039" H 3250 1750 50  0001 C CNN
F 1 "V-" H 3250 2040 50  0000 C CNN
F 2 "" H 3250 1900 50  0000 C CNN
F 3 "" H 3250 1900 50  0000 C CNN
	1    3250 1900
	-1   0    0    1   
$EndComp
$Comp
L GNDA #PWR040
U 1 1 58D9831C
P 3600 1900
F 0 "#PWR040" H 3600 1650 50  0001 C CNN
F 1 "GNDA" H 3600 1750 50  0000 C CNN
F 2 "" H 3600 1900 50  0001 C CNN
F 3 "" H 3600 1900 50  0001 C CNN
	1    3600 1900
	0    -1   -1   0   
$EndComp
$Comp
L V- #PWR041
U 1 1 58D9831D
P 1600 1950
F 0 "#PWR041" H 1600 1800 50  0001 C CNN
F 1 "V-" H 1600 2090 50  0000 C CNN
F 2 "" H 1600 1950 50  0000 C CNN
F 3 "" H 1600 1950 50  0000 C CNN
	1    1600 1950
	-1   0    0    1   
$EndComp
$Comp
L V+ #PWR042
U 1 1 58D9831E
P 1600 1050
F 0 "#PWR042" H 1600 900 50  0001 C CNN
F 1 "V+" H 1600 1190 50  0000 C CNN
F 2 "" H 1600 1050 50  0000 C CNN
F 3 "" H 1600 1050 50  0000 C CNN
	1    1600 1050
	1    0    0    -1  
$EndComp
$Comp
L V+ #PWR043
U 1 1 58D9831F
P 6900 1450
F 0 "#PWR043" H 6900 1300 50  0001 C CNN
F 1 "V+" H 6900 1590 50  0000 C CNN
F 2 "" H 6900 1450 50  0000 C CNN
F 3 "" H 6900 1450 50  0000 C CNN
	1    6900 1450
	1    0    0    -1  
$EndComp
$Comp
L V- #PWR044
U 1 1 58D98320
P 6900 2000
F 0 "#PWR044" H 6900 1850 50  0001 C CNN
F 1 "V-" H 6900 2140 50  0000 C CNN
F 2 "" H 6900 2000 50  0000 C CNN
F 3 "" H 6900 2000 50  0000 C CNN
	1    6900 2000
	-1   0    0    1   
$EndComp
$Comp
L GNDA #PWR045
U 1 1 58D98321
P 2400 1600
F 0 "#PWR045" H 2400 1350 50  0001 C CNN
F 1 "GNDA" H 2400 1450 50  0000 C CNN
F 2 "" H 2400 1600 50  0001 C CNN
F 3 "" H 2400 1600 50  0001 C CNN
	1    2400 1600
	0    1    1    0   
$EndComp
$Comp
L R R309
U 1 1 58D98322
P 7600 1850
F 0 "R309" V 7680 1850 50  0000 C CNN
F 1 "121k" V 7600 1850 50  0000 C CNN
F 2 "Resistors_SMD:R_0603_HandSoldering" V 7530 1850 50  0001 C CNN
F 3 "" H 7600 1850 50  0001 C CNN
	1    7600 1850
	1    0    0    -1  
$EndComp
$Comp
L R R310
U 1 1 58D98323
P 7900 2000
F 0 "R310" V 7980 2000 50  0000 C CNN
F 1 "121k" V 7900 2000 50  0000 C CNN
F 2 "Resistors_SMD:R_0603_HandSoldering" V 7830 2000 50  0001 C CNN
F 3 "" H 7900 2000 50  0001 C CNN
	1    7900 2000
	0    1    1    0   
$EndComp
Wire Wire Line
	7600 2200 7600 2000
Wire Wire Line
	7600 2000 7750 2000
Wire Wire Line
	6900 2000 6900 1950
$Comp
L R R316
U 1 1 58D98324
P 1400 3600
F 0 "R316" V 1480 3600 50  0000 C CNN
F 1 "2M" V 1400 3600 50  0000 C CNN
F 2 "Resistors_SMD:R_0603_HandSoldering" V 1330 3600 50  0001 C CNN
F 3 "" H 1400 3600 50  0001 C CNN
	1    1400 3600
	1    0    0    -1  
$EndComp
$Comp
L R R317
U 1 1 58D98325
P 1750 3600
F 0 "R317" V 1830 3600 50  0000 C CNN
F 1 "2M" V 1750 3600 50  0000 C CNN
F 2 "Resistors_SMD:R_0603_HandSoldering" V 1680 3600 50  0001 C CNN
F 3 "" H 1750 3600 50  0001 C CNN
	1    1750 3600
	1    0    0    -1  
$EndComp
$Comp
L R R311
U 1 1 58D98326
P 1750 3000
F 0 "R311" V 1830 3000 50  0000 C CNN
F 1 "2M" V 1750 3000 50  0000 C CNN
F 2 "Resistors_SMD:R_0603_HandSoldering" V 1680 3000 50  0001 C CNN
F 3 "" H 1750 3000 50  0001 C CNN
	1    1750 3000
	1    0    0    -1  
$EndComp
$Comp
L CONN_01X02 J304
U 1 1 58D98327
P 900 3000
F 0 "J304" H 900 3150 50  0000 C CNN
F 1 "Sensor 3" V 1000 3000 50  0000 C CNN
F 2 "nocko:TerminalBlock_Pheonix_PT-5mm_2pol" H 900 3000 50  0001 C CNN
F 3 "" H 900 3000 50  0001 C CNN
	1    900  3000
	-1   0    0    -1  
$EndComp
$Comp
L C C310
U 1 1 58D98328
P 2200 3200
F 0 "C310" V 2250 3250 50  0000 L CNN
F 1 "1µF" V 2050 3100 50  0000 L CNN
F 2 "Capacitors_SMD:C_0603_HandSoldering" H 2238 3050 50  0001 C CNN
F 3 "" H 2200 3200 50  0001 C CNN
	1    2200 3200
	0    1    1    0   
$EndComp
$Comp
L C C312
U 1 1 58D98329
P 2200 3600
F 0 "C312" V 2150 3650 50  0000 L CNN
F 1 "1µF" V 2350 3500 50  0000 L CNN
F 2 "Capacitors_SMD:C_0603_HandSoldering" H 2238 3450 50  0001 C CNN
F 3 "" H 2200 3600 50  0001 C CNN
	1    2200 3600
	0    1    1    0   
$EndComp
$Comp
L AD8622 U302
U 2 1 58D9832A
P 6950 3500
F 0 "U302" H 7150 3650 50  0000 L CNN
F 1 "AD8622" H 7050 3400 50  0000 L CNN
F 2 "Housings_SSOP:MSOP-8_3x3mm_Pitch0.65mm" H 6950 3500 50  0001 C CNN
F 3 "" H 6950 3500 50  0001 C CNN
	2    6950 3500
	1    0    0    -1  
$EndComp
$Comp
L C C311
U 1 1 58D9832B
P 6250 3550
F 0 "C311" H 6275 3650 50  0000 L CNN
F 1 "910pF" H 6150 3450 50  0000 L CNN
F 2 "Capacitors_SMD:C_0603_HandSoldering" H 6288 3400 50  0001 C CNN
F 3 "" H 6250 3550 50  0001 C CNN
	1    6250 3550
	1    0    0    -1  
$EndComp
$Comp
L C C309
U 1 1 58D9832C
P 6600 2950
F 0 "C309" V 6550 3000 50  0000 L CNN
F 1 "9.1nF" V 6650 3000 50  0000 L CNN
F 2 "Capacitors_SMD:C_0603_HandSoldering" H 6638 2800 50  0001 C CNN
F 3 "" H 6600 2950 50  0001 C CNN
	1    6600 2950
	0    1    1    0   
$EndComp
$Comp
L R R315
U 1 1 58D9832D
P 6000 3400
F 0 "R315" V 6080 3400 50  0000 C CNN
F 1 "1.78M" V 6000 3400 39  0000 C CNN
F 2 "Resistors_SMD:R_0603_HandSoldering" V 5930 3400 50  0001 C CNN
F 3 "" H 6000 3400 50  0001 C CNN
	1    6000 3400
	0    1    1    0   
$EndComp
$Comp
L R R314
U 1 1 58D9832E
P 5600 3400
F 0 "R314" V 5680 3400 50  0000 C CNN
F 1 "57.6k" V 5600 3400 50  0000 C CNN
F 2 "Resistors_SMD:R_0603_HandSoldering" V 5530 3400 50  0001 C CNN
F 3 "" H 5600 3400 50  0001 C CNN
	1    5600 3400
	0    1    1    0   
$EndComp
$Comp
L R R318
U 1 1 58D9832F
P 2500 3600
F 0 "R318" V 2580 3600 50  0000 C CNN
F 1 "390k" V 2500 3600 50  0000 C CNN
F 2 "Resistors_SMD:R_0603_HandSoldering" V 2430 3600 50  0001 C CNN
F 3 "" H 2500 3600 50  0001 C CNN
	1    2500 3600
	1    0    0    -1  
$EndComp
$Comp
L R R312
U 1 1 58D98330
P 2500 3200
F 0 "R312" V 2580 3200 50  0000 C CNN
F 1 "390k" V 2500 3200 50  0000 C CNN
F 2 "Resistors_SMD:R_0603_HandSoldering" V 2430 3200 50  0001 C CNN
F 3 "" H 2500 3200 50  0001 C CNN
	1    2500 3200
	1    0    0    -1  
$EndComp
$Comp
L AD8227 U303
U 1 1 58D98331
P 3250 3400
F 0 "U303" H 3400 3525 50  0000 L CNN
F 1 "AD8227" H 3400 3275 50  0000 L CNN
F 2 "Housings_SSOP:MSOP-8_3x3mm_Pitch0.65mm" H 3350 3400 50  0001 C CNN
F 3 "" H 3350 3400 50  0001 C CNN
	1    3250 3400
	1    0    0    -1  
$EndComp
$Comp
L R_Small R313
U 1 1 58D98332
P 2850 3400
F 0 "R313" V 2900 3300 50  0000 L CNN
F 1 "8k" V 2850 3380 31  0000 L CNN
F 2 "Resistors_SMD:R_0603_HandSoldering" H 2850 3400 50  0001 C CNN
F 3 "" H 2850 3400 50  0001 C CNN
	1    2850 3400
	1    0    0    -1  
$EndComp
Wire Wire Line
	1100 3050 1400 3050
Wire Wire Line
	1100 2950 1100 2850
Wire Wire Line
	1100 2850 1750 2850
Connection ~ 1600 2850
Wire Wire Line
	1400 3750 1750 3750
Wire Wire Line
	1600 3750 1600 3750
Connection ~ 1600 3750
Wire Wire Line
	1750 3150 1750 3450
Wire Wire Line
	1900 3300 1900 3600
Wire Wire Line
	1400 3200 2050 3200
Wire Notes Line
	2050 2900 2700 2900
Wire Wire Line
	6650 3600 6500 3600
Wire Wire Line
	6500 3600 6500 4000
Wire Wire Line
	7600 2950 7600 3500
Wire Wire Line
	7250 3500 9000 3500
Wire Wire Line
	5750 3400 5850 3400
Wire Wire Line
	6150 3400 6650 3400
Connection ~ 6250 3400
Wire Wire Line
	5800 3400 5800 2950
Wire Wire Line
	5800 2950 6450 2950
Connection ~ 5800 3400
Wire Wire Line
	7600 2950 6750 2950
Connection ~ 7600 3500
Wire Notes Line
	5250 2800 8350 2800
Wire Notes Line
	8350 2800 8350 4250
Wire Notes Line
	5250 4250 5250 2800
Wire Wire Line
	6500 4000 7600 4000
Wire Wire Line
	2350 3050 2750 3050
Wire Wire Line
	2350 3050 2350 3200
Connection ~ 2500 3050
Wire Wire Line
	2350 3600 2350 3750
Wire Wire Line
	2500 3350 2500 3450
Wire Wire Line
	2400 3400 2500 3400
Connection ~ 2500 3400
Wire Wire Line
	1900 3600 2050 3600
Wire Wire Line
	2350 3750 2750 3750
Connection ~ 2500 3750
Wire Notes Line
	2050 3900 2700 3900
Wire Notes Line
	2700 3900 2700 2900
Wire Notes Line
	2050 2900 2050 3900
Wire Notes Line
	8350 4250 5250 4250
Wire Wire Line
	3600 3700 3350 3700
Wire Wire Line
	2750 3050 2950 3200
Wire Wire Line
	2750 3750 2950 3600
Wire Wire Line
	3650 3400 5450 3400
Wire Wire Line
	2950 3300 2850 3300
Wire Wire Line
	2950 3500 2850 3500
Connection ~ 1750 3300
Wire Wire Line
	1750 3300 1900 3300
Text Notes 7650 2900 0    60   ~ 0
Antialias Filter
Text HLabel 9000 3500 2    60   Output ~ 0
Channel3
$Comp
L TEST_1P J305
U 1 1 58D98333
P 4400 3400
F 0 "J305" H 4400 3670 50  0000 C CNN
F 1 "INA_OUT3" H 4400 3600 50  0000 C CNN
F 2 "Measurement_Points:Measurement_Point_Square-SMD-Pad_Small" H 4600 3400 50  0001 C CNN
F 3 "" H 4600 3400 50  0001 C CNN
	1    4400 3400
	1    0    0    -1  
$EndComp
$Comp
L TEST_1P J306
U 1 1 58D98334
P 8650 3500
F 0 "J306" H 8650 3770 50  0000 C CNN
F 1 "OUT3" H 8650 3700 50  0000 C CNN
F 2 "Measurement_Points:Measurement_Point_Round-SMD-Pad_Small" H 8850 3500 50  0001 C CNN
F 3 "" H 8850 3500 50  0001 C CNN
	1    8650 3500
	1    0    0    -1  
$EndComp
Connection ~ 4400 3400
Connection ~ 8650 3500
$Comp
L V+ #PWR046
U 1 1 58D98335
P 3250 3100
F 0 "#PWR046" H 3250 2950 50  0001 C CNN
F 1 "V+" H 3250 3240 50  0000 C CNN
F 2 "" H 3250 3100 50  0000 C CNN
F 3 "" H 3250 3100 50  0000 C CNN
	1    3250 3100
	1    0    0    -1  
$EndComp
$Comp
L V- #PWR047
U 1 1 58D98336
P 3250 3700
F 0 "#PWR047" H 3250 3550 50  0001 C CNN
F 1 "V-" H 3250 3840 50  0000 C CNN
F 2 "" H 3250 3700 50  0000 C CNN
F 3 "" H 3250 3700 50  0000 C CNN
	1    3250 3700
	-1   0    0    1   
$EndComp
$Comp
L GNDA #PWR048
U 1 1 58D98337
P 3600 3700
F 0 "#PWR048" H 3600 3450 50  0001 C CNN
F 1 "GNDA" H 3600 3550 50  0000 C CNN
F 2 "" H 3600 3700 50  0001 C CNN
F 3 "" H 3600 3700 50  0001 C CNN
	1    3600 3700
	0    -1   -1   0   
$EndComp
$Comp
L V- #PWR049
U 1 1 58D98338
P 1600 3750
F 0 "#PWR049" H 1600 3600 50  0001 C CNN
F 1 "V-" H 1600 3890 50  0000 C CNN
F 2 "" H 1600 3750 50  0000 C CNN
F 3 "" H 1600 3750 50  0000 C CNN
	1    1600 3750
	-1   0    0    1   
$EndComp
$Comp
L V+ #PWR050
U 1 1 58D98339
P 1600 2850
F 0 "#PWR050" H 1600 2700 50  0001 C CNN
F 1 "V+" H 1600 2990 50  0000 C CNN
F 2 "" H 1600 2850 50  0000 C CNN
F 3 "" H 1600 2850 50  0000 C CNN
	1    1600 2850
	1    0    0    -1  
$EndComp
$Comp
L V+ #PWR051
U 1 1 58D9833A
P 6900 3250
F 0 "#PWR051" H 6900 3100 50  0001 C CNN
F 1 "V+" H 6900 3390 50  0000 C CNN
F 2 "" H 6900 3250 50  0000 C CNN
F 3 "" H 6900 3250 50  0000 C CNN
	1    6900 3250
	1    0    0    -1  
$EndComp
$Comp
L V- #PWR052
U 1 1 58D9833B
P 6900 3800
F 0 "#PWR052" H 6900 3650 50  0001 C CNN
F 1 "V-" H 6900 3940 50  0000 C CNN
F 2 "" H 6900 3800 50  0000 C CNN
F 3 "" H 6900 3800 50  0000 C CNN
	1    6900 3800
	-1   0    0    1   
$EndComp
$Comp
L GNDA #PWR053
U 1 1 58D9833C
P 2400 3400
F 0 "#PWR053" H 2400 3150 50  0001 C CNN
F 1 "GNDA" H 2400 3250 50  0000 C CNN
F 2 "" H 2400 3400 50  0001 C CNN
F 3 "" H 2400 3400 50  0001 C CNN
	1    2400 3400
	0    1    1    0   
$EndComp
$Comp
L R R319
U 1 1 58D9833D
P 7600 3650
F 0 "R319" V 7680 3650 50  0000 C CNN
F 1 "121k" V 7600 3650 50  0000 C CNN
F 2 "Resistors_SMD:R_0603_HandSoldering" V 7530 3650 50  0001 C CNN
F 3 "" H 7600 3650 50  0001 C CNN
	1    7600 3650
	1    0    0    -1  
$EndComp
$Comp
L R R320
U 1 1 58D9833E
P 7900 3800
F 0 "R320" V 7980 3800 50  0000 C CNN
F 1 "121k" V 7900 3800 50  0000 C CNN
F 2 "Resistors_SMD:R_0603_HandSoldering" V 7830 3800 50  0001 C CNN
F 3 "" H 7900 3800 50  0001 C CNN
	1    7900 3800
	0    1    1    0   
$EndComp
Wire Wire Line
	7600 4000 7600 3800
Wire Wire Line
	7600 3800 7750 3800
Wire Wire Line
	6900 3800 6900 3750
$Comp
L V+ #PWR054
U 1 1 58D9833F
P 9900 850
F 0 "#PWR054" H 9900 700 50  0001 C CNN
F 1 "V+" H 9900 990 50  0000 C CNN
F 2 "" H 9900 850 50  0000 C CNN
F 3 "" H 9900 850 50  0000 C CNN
	1    9900 850 
	1    0    0    -1  
$EndComp
$Comp
L V- #PWR055
U 1 1 58D98340
P 9900 1150
F 0 "#PWR055" H 9900 1000 50  0001 C CNN
F 1 "V-" H 9900 1290 50  0000 C CNN
F 2 "" H 9900 1150 50  0000 C CNN
F 3 "" H 9900 1150 50  0000 C CNN
	1    9900 1150
	-1   0    0    1   
$EndComp
$Comp
L AD8622 U302
U 1 1 58D98341
P 6950 1700
F 0 "U302" H 7150 1850 50  0000 L CNN
F 1 "AD8622" H 7050 1600 50  0000 L CNN
F 2 "Housings_SSOP:MSOP-8_3x3mm_Pitch0.65mm" H 6950 1700 50  0001 C CNN
F 3 "" H 6950 1700 50  0001 C CNN
	1    6950 1700
	1    0    0    -1  
$EndComp
$Comp
L GNDA #PWR056
U 1 1 58D98342
P 8050 2000
F 0 "#PWR056" H 8050 1750 50  0001 C CNN
F 1 "GNDA" H 8050 1850 50  0000 C CNN
F 2 "" H 8050 2000 50  0001 C CNN
F 3 "" H 8050 2000 50  0001 C CNN
	1    8050 2000
	0    -1   -1   0   
$EndComp
$Comp
L GNDA #PWR057
U 1 1 58D98343
P 8050 3800
F 0 "#PWR057" H 8050 3550 50  0001 C CNN
F 1 "GNDA" H 8050 3650 50  0000 C CNN
F 2 "" H 8050 3800 50  0001 C CNN
F 3 "" H 8050 3800 50  0001 C CNN
	1    8050 3800
	0    -1   -1   0   
$EndComp
$Comp
L GNDA #PWR058
U 1 1 58D98344
P 6250 3700
F 0 "#PWR058" H 6250 3450 50  0001 C CNN
F 1 "GNDA" H 6250 3550 50  0000 C CNN
F 2 "" H 6250 3700 50  0001 C CNN
F 3 "" H 6250 3700 50  0001 C CNN
	1    6250 3700
	1    0    0    -1  
$EndComp
$Comp
L GNDA #PWR059
U 1 1 58D98345
P 6250 1900
F 0 "#PWR059" H 6250 1650 50  0001 C CNN
F 1 "GNDA" H 6250 1750 50  0000 C CNN
F 2 "" H 6250 1900 50  0001 C CNN
F 3 "" H 6250 1900 50  0001 C CNN
	1    6250 1900
	1    0    0    -1  
$EndComp
$Comp
L C C301
U 1 1 58D98346
P 9420 1000
F 0 "C301" H 9445 1100 50  0000 L CNN
F 1 "0.1μF" H 9445 900 50  0000 L CNN
F 2 "Capacitors_SMD:C_0603_HandSoldering" H 9458 850 50  0001 C CNN
F 3 "" H 9420 1000 50  0001 C CNN
	1    9420 1000
	1    0    0    -1  
$EndComp
Connection ~ 9650 1150
Connection ~ 9650 850 
Wire Wire Line
	1400 1250 1400 1650
Wire Wire Line
	1400 3050 1400 3450
Connection ~ 1400 3200
Wire Wire Line
	2050 1400 1400 1400
Connection ~ 1400 1400
$EndSCHEMATC