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 A4 11693 8268 encoding utf-8 Sheet 1 2 Title "" Date "2017-03-23" Rev "AA" Comp "" Comment1 "" Comment2 "" Comment3 "" Comment4 "" $EndDescr $Sheet S 950 2350 950 750 U 58D4647E F0 "channel0-1" 60 F1 "channel0.sch" 60 F2 "OUTPUT0" O R 1900 2450 87 F3 "OUTPUT1" O R 1900 2800 87 F4 "GUARD0" O R 1900 2600 87 F5 "GUARD1" O R 1900 2950 87 $EndSheet $Comp L CONN_01X02 J101 U 1 1 58D57064 P 4700 2800 F 0 "J101" H 4700 2950 50 0000 C CNN F 1 "External 5V Ref" V 4800 2800 50 0000 C CNN F 2 "" H 4700 2800 50 0001 C CNN F 3 "" H 4700 2800 50 0001 C CNN 1 4700 2800 -1 0 0 1 $EndComp $Comp L GNDA #PWR104 U 1 1 58D5726E P 4900 2850 F 0 "#PWR104" H 4900 2600 50 0001 C CNN F 1 "GNDA" H 4900 2700 50 0000 C CNN F 2 "" H 4900 2850 50 0001 C CNN F 3 "" H 4900 2850 50 0001 C CNN 1 4900 2850 1 0 0 -1 $EndComp Wire Wire Line 4900 2750 5400 2750 Wire Wire Line 5400 2950 5400 3400 Wire Wire Line 5400 3400 6100 3400 Wire Wire Line 6100 3400 6100 2850 Wire Wire Line 6000 2850 6400 2850 $Comp L GNDA #PWR105 U 1 1 58D57376 P 5650 3100 F 0 "#PWR105" H 5650 2850 50 0001 C CNN F 1 "GNDA" H 5650 2950 50 0000 C CNN F 2 "" H 5650 3100 50 0001 C CNN F 3 "" H 5650 3100 50 0001 C CNN 1 5650 3100 1 0 0 -1 $EndComp Text GLabel 6400 2850 2 87 Input ~ 0 Vref Connection ~ 6100 2850 $Comp L R R101 U 1 1 58D5759A P 4800 3950 F 0 "R101" V 4880 3950 50 0000 C CNN F 1 "10k" V 4800 3950 50 0000 C CNN F 2 "" V 4730 3950 50 0001 C CNN F 3 "" H 4800 3950 50 0001 C CNN 1 4800 3950 1 0 0 1 $EndComp $Comp L R R102 U 1 1 58D57637 P 4800 4350 F 0 "R102" V 4880 4350 50 0000 C CNN F 1 "10k" V 4800 4350 50 0000 C CNN F 2 "" V 4730 4350 50 0001 C CNN F 3 "" H 4800 4350 50 0001 C CNN 1 4800 4350 1 0 0 1 $EndComp Wire Wire Line 4800 4100 4800 4200 Wire Wire Line 4800 4150 5550 4150 Connection ~ 4800 4150 $Comp L GNDA #PWR107 U 1 1 58D577C3 P 4800 4500 F 0 "#PWR107" H 4800 4250 50 0001 C CNN F 1 "GNDA" H 4800 4350 50 0000 C CNN F 2 "" H 4800 4500 50 0001 C CNN F 3 "" H 4800 4500 50 0001 C CNN 1 4800 4500 -1 0 0 -1 $EndComp $Comp L GNDA #PWR108 U 1 1 58D577F5 P 5800 4500 F 0 "#PWR108" H 5800 4250 50 0001 C CNN F 1 "GNDA" H 5800 4350 50 0000 C CNN F 2 "" H 5800 4500 50 0001 C CNN F 3 "" H 5800 4500 50 0001 C CNN 1 5800 4500 1 0 0 -1 $EndComp Wire Wire Line 5550 4350 5550 4800 Wire Wire Line 6650 4250 6150 4250 Text GLabel 6650 4250 2 87 Input ~ 0 Vref/2 $Comp L VBATT #PWR101 U 1 1 58D58272 P 5650 2600 F 0 "#PWR101" H 5650 2450 50 0001 C CNN F 1 "VBATT" H 5650 2750 50 0000 C CNN F 2 "" H 5650 2600 50 0000 C CNN F 3 "" H 5650 2600 50 0000 C CNN 1 5650 2600 1 0 0 -1 $EndComp Wire Wire Line 5150 2750 5150 3750 Connection ~ 5150 2750 $Comp L AD8622 U101 U 1 1 58D5411B P 5700 2850 F 0 "U101" H 5900 3000 50 0000 L CNN F 1 "AD8622" H 5750 2700 50 0000 L CNN F 2 "" H 5700 2850 50 0001 C CNN F 3 "" H 5700 2850 50 0001 C CNN 1 5700 2850 1 0 0 -1 $EndComp Text Notes 5900 2550 0 60 ~ 0 Excitation Supply Text Notes 5900 2600 0 39 ~ 0 Noise not critical; due to INAMP CMRR $Comp L AD8538 U103 U 1 1 58D54621 P 5850 4250 F 0 "U103" H 6050 4400 50 0000 L CNN F 1 "AD8538" H 5900 4100 50 0000 L CNN F 2 "" H 5850 4250 50 0001 C CNN F 3 "" H 5850 4250 50 0001 C CNN 1 5850 4250 1 0 0 -1 $EndComp Wire Wire Line 4800 3750 6400 3750 Wire Wire Line 5800 3750 5800 4000 Wire Wire Line 4800 3800 4800 3750 Connection ~ 5150 3750 $Comp L CP C102 U 1 1 58D54979 P 6400 4000 F 0 "C102" H 6425 4100 50 0000 L CNN F 1 "1µF" H 6425 3900 50 0000 L CNN F 2 "" H 6438 3850 50 0001 C CNN F 3 "" H 6400 4000 50 0001 C CNN 1 6400 4000 1 0 0 -1 $EndComp $Comp L CP C103 U 1 1 58D54A48 P 6400 4500 F 0 "C103" H 6425 4600 50 0000 L CNN F 1 "1µF" H 6425 4400 50 0000 L CNN F 2 "" H 6438 4350 50 0001 C CNN F 3 "" H 6400 4500 50 0001 C CNN 1 6400 4500 1 0 0 -1 $EndComp Wire Wire Line 6400 3750 6400 3850 Connection ~ 5800 3750 Wire Wire Line 6400 4150 6400 4350 Connection ~ 6400 4250 Wire Wire Line 6400 4650 6400 4800 Wire Wire Line 6400 4800 5550 4800 Text Notes 5950 3650 0 60 ~ 0 Virtual Ground Supply Text Notes 5950 3700 0 39 ~ 0 Noise Transmitted directly to ADC $EndSCHEMATC