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Document AC/DC coupling differences

This commit is contained in:
Shawn Nock 2017-04-04 16:18:50 -04:00
parent 1ce6f742dd
commit b51ad9a9c6
2 changed files with 249 additions and 235 deletions
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@ -114,7 +114,7 @@ F 3 "" H 2200 1800 50 0001 C CNN
0 1 1 0 0 1 1 0
$EndComp $EndComp
Text Notes 1950 1000 0 60 ~ 0 Text Notes 1950 1000 0 60 ~ 0
AC Coupling\n3dB down @ 0.04Hz Optional AC Coupling\n3dB down @ 0.04Hz
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U 1 1 58D49933 U 1 1 58D49933
@ -304,8 +304,8 @@ Wire Wire Line
Connection ~ 1750 1500 Connection ~ 1750 1500
Wire Wire Line Wire Wire Line
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Text Notes 1950 1050 0 39 ~ 0 Text Notes 750 2840 0 39 ~ 0
When DC coupled, sensor failure grounds output. For AC coupling: Populate as shown. Trim pot not required\n\nFor DC coupling: Replace C206,C208 with 5 kOhm resistors.\nR202,R208 may be omitted. Trim pot required. \nCut jumpers on pot footprint before installation.
Text Notes 2750 2350 0 39 ~ 0 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 CMRR: >95dB\nVoltage Noise Density @ G=15: <23.5nV/√Hz\nVoltage Noise (0.1-10Hz): < 0.8μV p-p\nSupply Current: <425μA
Text Notes 7080 2570 0 39 ~ 0 Text Notes 7080 2570 0 39 ~ 0
@ -342,7 +342,7 @@ F 3 "" H 9650 1000 50 0001 C CNN
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1 0 0 -1 1 0 0 -1
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Text Notes 3630 5410 0 60 ~ 0 Text Notes 3520 5380 0 60 ~ 0
Problems:\n\n - USB-1208FS has fixed single-ended range of ±10V\n - Drop in upgrade to USB-1608FS (16bit and variable range)\n - Mitigated initially by running on 18V via two 9V batteries.\n\n - R202, R208, R212, R218; 39M only available in thick film. \n - More (slightly) 1/f noise and ±5% accuracy.\n\n - AC coupling isn't optional in this design. Rhodri keen\n to try AC route first; add cost / complexity later if needed. Problems:\n\n - USB-1208FS has fixed single-ended range of ±10V\n - Drop in upgrade to USB-1608FS (16bit and variable range)\n - Mitigated initially by running on 18V via two 9V batteries.\n\n - R202, R208, R212, R218; 39M only available in thick film. \n - More (slightly) 1/f noise and ±5% accuracy.\n\n - AC coupling isn't optional in this design. Rhodri keen\n to try AC route first; add cost / complexity later if needed.
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F 2 "" H 6250 3700 50 0001 C CNN F 2 "" H 6290 3880 50 0001 C CNN
F 3 "" H 6250 3700 50 0001 C CNN F 3 "" H 6290 3880 50 0001 C CNN
1 6250 3700 1 6290 3880
1 0 0 -1 1 0 0 -1
$EndComp $EndComp
$Comp $Comp
@ -924,8 +924,8 @@ Connection ~ 9650 850
Wire Wire Line Wire Wire Line
1400 1250 1400 1650 1400 1250 1400 1650
Wire Wire Line Wire Wire Line
1400 3050 1400 3450 1440 3230 1440 3630
Connection ~ 1400 3200 Connection ~ 1440 3380
Wire Wire Line Wire Wire Line
2050 1400 1400 1400 2050 1400 1400 1400
Connection ~ 1400 1400 Connection ~ 1400 1400
@ -989,9 +989,9 @@ Wire Wire Line
9420 1450 10150 1450 9420 1450 10150 1450
Connection ~ 9900 1450 Connection ~ 9900 1450
Connection ~ 9650 1450 Connection ~ 9650 1450
Connection ~ 7600 4000 Connection ~ 7640 4180
Wire Wire Line Wire Wire Line
7600 3900 7600 4000 7640 4080 7640 4180
Connection ~ 7600 2200 Connection ~ 7600 2200
Wire Wire Line Wire Wire Line
7600 2110 7600 2200 7600 2110 7600 2200
@ -1026,39 +1026,53 @@ Wire Wire Line
$Comp $Comp
L V- #PWR039 L V- #PWR039
U 1 1 58E47292 U 1 1 58E47292
P 1580 4130 P 1620 4310
F 0 "#PWR039" H 1580 3980 50 0001 C CNN F 0 "#PWR039" H 1620 4160 50 0001 C CNN
F 1 "V-" H 1580 4270 50 0000 C CNN F 1 "V-" H 1620 4450 50 0000 C CNN
F 2 "" H 1580 4130 50 0000 C CNN F 2 "" H 1620 4310 50 0000 C CNN
F 3 "" H 1580 4130 50 0000 C CNN F 3 "" H 1620 4310 50 0000 C CNN
1 1580 4130 1 1620 4310
-1 0 0 1 -1 0 0 1
$EndComp $EndComp
$Comp $Comp
L POT_TRIM RV202 L POT_TRIM RV202
U 1 1 58E47298 U 1 1 58E47298
P 1580 3890 P 1620 4070
F 0 "RV202" V 1500 3890 50 0000 C CNN F 0 "RV202" V 1540 4070 50 0000 C CNN
F 1 "100k" V 1580 3890 50 0000 C CNN F 1 "100k" V 1620 4070 50 0000 C CNN
F 2 "footprints:Potentiometer_Trimmer_Bourns_3296W_w_Bypass" H 1580 3890 50 0001 C CNN F 2 "footprints:Potentiometer_Trimmer_Bourns_3296W_w_Bypass" H 1620 4070 50 0001 C CNN
F 3 "" H 1580 3890 50 0001 C CNN F 3 "" H 1620 4070 50 0001 C CNN
1 1580 3890 1 1620 4070
0 1 1 0 0 1 1 0
$EndComp $EndComp
Wire Wire Line Wire Wire Line
1400 3750 1400 3890 1440 3930 1440 4070
Wire Wire Line Wire Wire Line
1580 4130 1580 4040 1620 4310 1620 4220
Wire Wire Line Wire Wire Line
1400 3890 1430 3890 1440 4070 1470 4070
Wire Wire Line Wire Wire Line
1750 3890 1750 3750 1790 4070 1790 3930
Wire Wire Line Wire Wire Line
1730 3890 1750 3890 1770 4070 1790 4070
Wire Wire Line Wire Wire Line
1400 2090 1400 1950 1400 2090 1400 1950
Wire Wire Line Wire Wire Line
1750 2090 1750 1950 1750 2090 1750 1950
Text Notes 450 7910 0 60 ~ 0 Text Notes 450 7910 0 60 ~ 0
Copyright 2017 University of Western Ontario\n\n Licensed under the Apache License, Version 2.0 (the "License");\n you may not use this file except in compliance with the License.\n You may obtain a copy of the License at\n\n http://www.apache.org/licenses/LICENSE-2.0\n\n Unless required by applicable law or agreed to in writing, software\n distributed under the License is distributed on an "AS IS" BASIS,\n WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n See the License for the specific language governing permissions and\n limitations under the License. Copyright 2017 University of Western Ontario\n\n Licensed under the Apache License, Version 2.0 (the "License");\n you may not use this file except in compliance with the License.\n You may obtain a copy of the License at\n\n http://www.apache.org/licenses/LICENSE-2.0\n\n Unless required by applicable law or agreed to in writing, software\n distributed under the License is distributed on an "AS IS" BASIS,\n WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n See the License for the specific language governing permissions and\n limitations under the License.
Wire Notes Line
1330 1970 1810 1970
Wire Notes Line
1810 1970 1810 2190
Wire Notes Line
1810 2190 1330 2190
Wire Notes Line
1330 2190 1330 1970
Wire Notes Line
1810 2100 1920 2100
Wire Notes Line
1920 2100 1920 2010
Wire Notes Line
1920 2010 2050 2010
$EndSCHEMATC $EndSCHEMATC

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