SLAU443 Datasheet, PDF (3/68 Pages) Texas Instruments – EEG Front-End Performance Demonstration Kit

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Dedicated Reference and Bias Electrode .............................................................................. 33
Programmable reference and bias electrode .......................................................................... 34
Settings for Normal Electrode............................................................................................ 35
Configuring BIASREF and Bias Drive Buffer .......................................................................... 35
Setting up the Bias Drive Loop .......................................................................................... 36
Setting the LOFF Register Bits .......................................................................................... 37
Configuring the Lead Off Comparator .................................................................................. 37
Lead off Status Registers ................................................................................................ 37
Scope tab for Impedance Measurement at 31.25Hz ................................................................. 38
FFT Analysis for Impedance Measurement at 31.25Hz.............................................................. 39
Scope Tab for Impedance Measurement at fDR/4 (DR = 4ksps) ................................................... 40
Multiplexer Setting for Calibration with Electrode Disconnected .................................................... 41
Multiplexer Setting with Positive Electrode Connected to Test Signal ............................................. 42
Multiplexer Setting with Both Electrodes Connected to Test Signal ................................................ 42
Channel Setting for Input Short Test.................................................................................... 43
Global Register Settings for Input Short Test.......................................................................... 43
Scope Tab for Input Short Test.......................................................................................... 44
Global Register Settings for External Input Short Test ............................................................... 45
Scope Showing Noise for Input Short with 5k Resistors ............................................................. 45
MISC1 Register Setting for SRB1....................................................................................... 46
Noise with Negative Input Connected to SRB1 Pin................................................................... 47
Noise with OPA376 in SRB1 Path ...................................................................................... 48
Scope Tab with Sinusoidal Inputs on AIN1 ............................................................................ 49
ADS1299EEG-FC Schematic ........................................................................................... 50
ADS1299EEG-FC Jumper Schematic ................................................................................. 51
ECG Power Supplies ..................................................................................................... 52
External Reference Drivers (Not Installed) ............................................................................ 53
ECG MDK Board Interface Adapter..................................................................................... 53
ADS1299EEG-FE Top Assembly ....................................................................................... 54
ADS1299EEG-FE Top Layer ............................................................................................ 54
ADS1299EEG-FE Internal Layer (1) .................................................................................... 55
ADS1299EEG-FE Internal Layer (2) .................................................................................... 55
ADS1299EEG-FE Bottom Layer ........................................................................................ 56
ADS1299EEG-FE Bottom Assembly.................................................................................... 56
Recommended Power Supply for ADS1299EEG-FE................................................................. 59
List of Tables
1 Factory Default Jumper Settings.......................................................................................... 6
2 Power Supply Test Points ................................................................................................ 15
3 Analog Supply Configurations ........................................................................................... 15
4 Digital Supply Configurations ............................................................................................ 15
5 Clock Jumper Options .................................................................................................... 15
6 External Reference Jumper Options .................................................................................... 16
7 Test Signals ................................................................................................................ 16
8 Serial Interface Pin Out ................................................................................................... 16
9 Dedicated Reference Drive Options through REF_ELEC............................................................ 33
10 Bill of Materials............................................................................................................. 57
SLAU443 – May 2012
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