SLAU443 Datasheet, PDF (2/68 Pages) Texas Instruments – EEG Front-End Performance Demonstration Kit

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7.2 Lead-Off Detection ............................................................................................... 36
7.3 External Calibration/Test Signals ............................................................................... 40
8 Test Options on the EVM ................................................................................................. 43
8.1 On Chip (ADS1299) Input Short ................................................................................ 43
8.2 External Input Short with 5K Resistor .......................................................................... 44
8.3 Noise with Common Reference on Negative Inputs ......................................................... 46
8.4 Noise with Buffered Common Reference Input ............................................................... 48
8.5 Internally Generated Test Signal and Other Multiplexer Inputs ............................................ 49
8.6 Arbitrary Input Signal ............................................................................................. 49
9 Bill of Materials, Layouts and Schematics ............................................................................. 50
9.1 ADS1299EEG-FE Front-End Board Schematics ............................................................. 50
9.2 Printed Circuit Board Layout .................................................................................... 53
9.3 Bill of Materials .................................................................................................... 57
9.4 ADS1299EEG-FE Power-Supply Recommendations ....................................................... 59
List of Figures
1 ADS1299EEG-FE Kit ....................................................................................................... 6
2 Executable to Run ADS1299 Software Installation..................................................................... 7
3 Initialization of ADS1299EEG-FE ......................................................................................... 8
4 License Agreement ......................................................................................................... 8
5 Installation Process ......................................................................................................... 9
6 USBStyx Driver Preinstallation ............................................................................................ 9
7 Completion of ADS1299 Software Installation......................................................................... 10
8 New Hardware Wizard.................................................................................................... 10
9 New Hardware Wizard Screen 3 ........................................................................................ 11
10 Completion of the Initial USB Drive ..................................................................................... 11
11 Second 'New Hardware" Wizard ........................................................................................ 12
12 Install the USBStyx Driver................................................................................................ 12
13 ADS1299 EEG-FE Front End Block Diagram ......................................................................... 14
14 Input Configurations Supported by the EEG-FE a) Differential Inputs b) Single ended inputs.................. 17
15 File Save Option Under 'Save' Tab ..................................................................................... 18
16 Channel Registers GUI for Global Registers .......................................................................... 19
17 Input Multiplexer for a Single Channel (MAIN = [000 or 110 or 111]) .............................................. 20
18 Channel Control Registers GUI Panel .................................................................................. 20
19 Register Bit for SRB1 Routing ........................................................................................... 21
20 Internal Test Signals ...................................................................................................... 21
21 Simplified Diode Arrangement ........................................................................................... 22
22 Eight Channel Read of Internal Temperature Data ................................................................... 22
23 GPIO Control Register GUI Panel....................................................................................... 23
24 LOFF_STATP and LOFF_STATN Comparators ...................................................................... 24
25 LOFF_SENSP and LOFF_SENSN Registers GUI Panel ............................................................ 24
26 Lead-Off Status Indicator................................................................................................. 25
27 BIAS_SENSP and BIAS_SENSN GUI Panel.......................................................................... 26
28 Device Register Settings ................................................................................................. 26
29 Scope Tool Features...................................................................................................... 27
30 Zoom Option on the Waveform Examination Tool .................................................................... 28
31 Histogram Bins for Input Short Noise ................................................................................... 29
32 Analysis : FFT Graph of Input Short Test .............................................................................. 30
33 Analysis : FFT : AC Analysis Parameters : Windowing Options .................................................... 31
34 Analysis : FFT : FFT Analysis : Input Short Condition................................................................ 31
35 Changing the User-Defined Dynamic Range for Channel 1 ......................................................... 32
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EEG Front-End Performance Demonstration Kit
Copyright © 2012, Texas Instruments Incorporated
SLAU443 – May 2012
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