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ADAS1000-4BSTZ 数据表(PDF) 33 Page - Analog Devices |
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ADAS1000-4BSTZ 数据表(HTML) 33 Page - Analog Devices |
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33 / 80 page  Data Sheet ADAS1000-3/ADAS1000-4 DEFIBRILLATOR PROTECTION The ADAS1000-3/ADAS1000-4 do not include defibrillation protection on chip. Any defibrillation protection required by the application requires external components. Figure 61 and Figure 62 show examples of external defibrillator protection, which is required on each ECG channel, in the RLD path, and in the CM_IN path if using the CE input mode. Note that, in both cases, the total ECG path resistance is assumed to be 5 kΩ. The 22 MΩ resistors shown connected to RLD are optional and used to provide a safe termination voltage for an open ECG electrode; they may be larger in value. Note that, if using these resistors, the dc lead-off feature works best with the highest current setting. ESIS FILTERING The ADAS1000-3/ADAS1000-4 do not include electrosurgical interference suppression (ESIS) protection on chip. Any ESIS protection required by the application requires external components. ECG PATH INPUT MULTIPLEXING As shown in Figure 63, signal paths for numerous functions are provided on each ECG channel (except respiration, which only connects to the ECG1_LA, ECG2_LL, and ECG3_RA pins). Note that the channel enable switch occurs after the RLD amplifier connection, thus allowing the RLD to be connected (redirected into any one of the ECG paths). The CM_IN path is treated the same as the ECG signals. Figure 61. Possible Defibrillation Protection on ECG Paths Using Neon Bulbs Figure 62. Possible Defibrillation Protection on ECG Paths Using Diode Protection Figure 63. Typical ECG Channel Input Multiplexing ELECTRODE PATIENT CABLE 4k Ω ECG1 500 Ω 500 Ω ELECTRODE PATIENT CABLE 4k Ω ECG2 RLD 22M Ω1 22M Ω1 ARGON/NEON BULB ARGON/NEON BULB 1OPTIONAL. SP724 AVDD SP724 AVDD 500 Ω 500 Ω ADAS1000-3/ ADAS1000-4 ELECTRODE PATIENT CABLE 4.5k Ω ADAS1000-3/ ADAS1000-4 500Ω ELECTRODE PATIENT CABLE 4.5kΩ 500Ω RLD 22M Ω1 22M Ω1 AVDD AVDD 1OPTIONAL. 2TWO LITTELFUSE SP724 CHANNELS PER ELECTRODE MAY PROVIDE BEST PROTECTION. SP7242 SP7242 ECG1 ECG2 ANALOG LEAD (RA/LA/LL) INPUT AMPLIFIER RLD AMP DCLO CURRENT ACLO CURRENT 11.3pF RESPIRATION INPUT CALDAC CHANNEL ENABLE ECG PIN 1.3V VCM_REF + – TO CM AVERAGING FROM CM AVERAGING TO FILTERING ADAS1000 VCM MUX FOR LEAD CONFIG, COMMON ELECTRODE + – Rev. B | Page 33 of 80 |
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