Texas Instruments ADS1299, Руководство пользователя

Страница: 14 / 68

ADS1299EEG-FE Daughter Card Hardware Introduction
www.ti.com
Figure 13. ADS1299 EEG-FE Front End Block Diagram
The ADS1299EEG-FE board is a four-layer circuit board. The board layout is provided in Section 9 ; the
schematics are appended to this document. The following sections explain some of the hardware settings
possible with the EVM for evaluating the ADS1299 under various test conditions.
4.1 Power Supply
The EEG front-end EVM mounts on the MMB0 EVM with connectors J2, J3 and J4. The main power
supplies (+5V, +3V and +1.8V) for the front-end board are supplied by the host board (MMB0) through
connector J4. All other power supplies needed for the front-end board are generated on board by power
management devices. The EVM is shipped in +5V unipolar supply configuration.
The ADS1299 can operate from +5.0V analog supply (AVDD/AVSS) and +1.8V to +3.0V digital supply
(DVDD). A bipolar analog supply (±2.5V) can be used as well. The analog power consumption of the front-
end board can be measured by the current flowing through the JP2 jumper and JP20 jumper. The
ADS1299 can be powered down by shorting jumper JP5.
Test points TP5, TP6, TP7, TP8, TP9, TP10, and TP14 are provided to verify that the host power supplies
are correct. The corresponding voltages are shown in
Table 2 .
14 EEG Front-End Performance Demonstration Kit SLAU443 – May 2012
Submit Documentation Feedback
Copyright © 2012, Texas Instruments Incorporated