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ADS1294CZXGR Datasheet(PDF) 87 Page - Texas Instruments |
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ADS1294CZXGR Datasheet(HTML) 87 Page - Texas Instruments |
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87 / 114 page  INxP INxN RLDOUT RLDINV ADS129x CBlock RPull-up RPull-up CBlock Anti-aliasing/ Protection Anti-aliasing/ Protection RA LA INxP INxN RLDOUT RLDINV 1 M ADS129x 1.5 nF Anti-aliasing/ Protection Anti-aliasing/ Protection Protection RA LA RL ADS1294, ADS1294R, ADS1296, ADS1296R, ADS1298, ADS1298R www.ti.com SBAS459K – JANUARY 2010 – REVISED AUGUST 2015 Application Information (continued) The ADS129x provide the option to use input electrode voltages as feedback to the amplifier to more effectively stabilize the output to the amplifier reference voltage by setting corresponding bits in the RLD_SENSP and RLD_SENSN registers. See to Figure 94 for an example of a three-electrode system that leverages this technique. Figure 94. Setting Common-Mode Using RLD Electrode A second strategy for maintaining a valid common-mode voltage is to ac-couple the analog inputs, which is especially useful when a patient-drive electrode is not in use. A dc blocking capacitor combined with a voltage divider between the analog power supplies, or a pullup resistor to set the DC bias to a known point, effectively makes sure that the dc common-mode voltage never drifts. Applications that do not use a patient-drive electrode may still use the RLD amplifier on the ADS129x as a buffered midsupply voltage to bias the inputs. Take care when choosing the passive components because the capacitor and the resistors form an RC high-pass filter. If passive components are chosen poorly, the filter undesirably attenuates frequencies at the lower end of the signal band. Figure 95 shows an example of this configuration. Figure 95. Setting Common-Mode Without Using RLD Electrode Copyright © 2010–2015, Texas Instruments Incorporated Submit Documentation Feedback 87 Product Folder Links: ADS1294 ADS1294R ADS1296 ADS1296R ADS1298 ADS1298R |
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