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SSW-105-22-F-D-VS-K Datasheet(PDF) 15 Page - Texas Instruments |
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SSW-105-22-F-D-VS-K Datasheet(HTML) 15 Page - Texas Instruments |
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15 / 68 page  www.ti.com ADS1299EEG-FE Daughter Card Hardware Introduction Table 2. Power Supply Test Points Test Point Voltage TP7 +5.0V TP9 +1.8V TP10 +3.3V TP5 +5.0V TP13 +2.5V TP6 –2.5V TP8 GND The front-end board must be properly configured in order to achieve the various power-supply schemes. The default power-supply setting for the ADS1299EEG-FE is a unipolar analog supply of 5V and DVDD of either +3V or +1.8V. Table 3 shows the board and component configurations for each analog power- supply scheme; Table 4 shows the board configurations for the digital supply. Table 3. Analog Supply Configurations Unipolar Analog Supply Bipolar Analog Supply Power Supplies 5V ±2.5V JP2 (AVDD) 2-3 (default) 1-2 JP20 (AVSS) 1-2 (default) 2-3 U8 Don’t Care TPS72325 U9 Don’t Care TPS73225 Table 4. Digital Supply Configurations DVDD +3.0V +1.8V JP24 2-3 (default) 1-2 4.2 Clock The ADS1299 has an on-chip oscillator circuit that generates a 2.048MHz clock (nominal). This clock can vary by ±5% over temperature. For applications that require higher accuracy, the ADS1299 can also accept an external clock signal. The ADS1299EEG-FE provides an option to test both internal and external clock configurations. It also provides an option to generate the external clock from either the onboard oscillator or from an external clock source. The onboard oscillator is powered by the DVDD supply of the ADS1299. Care must be taken to ensure that the external oscillator can operate either with +1.8V or +3.0V, depending on the DVDD supply configuration. Table 5 shows the jumper settings for the three options for the ADS1299 clocks. Table 5. Clock Jumper Options ADS1299 Clock Internal Clock from the ADS1299 Clock from Oscillator on the EVM External Clock Source JP18 Not Installed 2-3 (default) 1-2 JP19 Don’t Care 1-2 Don’t Care J3– pin 17 Don’t Care Don’t Care External Clock Source 15 SLAU443 – May 2012 EEG Front-End Performance Demonstration Kit Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated |
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