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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MLZ2012A3R3W датащи(PDF) 48 Page - Texas Instruments |
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MLZ2012A3R3W датащи(HTML) 48 Page - Texas Instruments |
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48 / 68 page  Test Options on the EVM www.ti.com 8.4 Noise with Buffered Common Reference Input Connecting all the negative inputs to one reference electrode can lead to excessive leakage current on the electrode. The typical leakage current on ADS1299 channel is 200pA. So for a 16 channel system total leakage may be as large as 3.2nA. This number will become progressively worse as channel count is increased. If the leakage number is not acceptable there is an option to buffer the common reference input before connected it to all the negative inputs of the channel. On JP81 jumpers (3-4) and (5-6) are required. On JP8 a jumper (2-3) is required and on JP7 a jumper (1-2) is needed. The GUI settings are same as in Figure 56. Figure 57 shows a snapshot of the noise with SRB1 driven by a buffered reference. The drawback of using the buffer in the SRB1 path is increased noise. The noise contributors in these settings are two 5k resistors, op amp U4 and ADS1299 channel. As can be seen from the Figure 57 the noise with this approach is larger than noise in previous three approaches. At present OPA376 is installed on board for U4. A lower noise op amp can be used if needed. Figure 57. Noise with OPA376 in SRB1 Path 48 EEG Front-End Performance Demonstration Kit SLAU443 – May 2012 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated |
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