 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
ADAS1000 Datasheet(PDF) 40 Page - Analog Devices |
|
|
|||||||||||||||||||||||||||||
ADAS1000 Datasheet(HTML) 40 Page - Analog Devices |
|
|
40 / 80 page  ADAS1000/ADAS1000-1/ADAS1000-2 Data Sheet External Respiration Capacitors If necessary, the ADAS1000 allows the user to connect external capacitors into the respiration circuit to achieve higher resolution (<200 mΩ). This level of resolution requires that the cable impedance be ≤1 kΩ. The diagram in Figure 70 shows the connections at RESPDAC_xx paths for the extended respiration configuration. Again, the EXT_RESP_xx paths can be connected at the patient side of any filtering circuit; however, the user must provide protection for these pins. While this external capacitor mode requires external components, it can deliver a larger signal- to-noise ratio. Note again that respiration can be measured on only one lead (at one time); therefore, only one pair of external respiration paths (and external capacitors) is required. If required, further improvements in respiration performance may be possible with the use of an instrumentation amplifier and op amp external to the ADAS1000. The instrumentation amplifier must have sufficiently low noise performance to meet the target performance levels. This mode uses the external capacitor mode configuration and is shown in Figure 71. Bit 14 of the RESPCTL register (Address 0x03; see Table 30) allows the user to bypass the on-chip amplifier when using an external instrumentation amplifier. Figure 70. Respiration Measurement Using External Capacitor Figure 71. Respiration Using External Capacitor and External Amplifiers ±1V ±1V LPF LA CABLE ECG1_LA EXT_RESP_LA ECG2_LL EXT_RESP_LL ECG3_RA EXT_RESP_RA ADAS1000 46.5kHz TO 64kHz 46.5kHz TO 64kHz OVERSAMPLED 5kΩ 1kΩ 1kΩ 1kΩ 5kΩ 100pF 100pF fc=10kHz fc=150kHz 7Hz RESPDAC_LA RESPDAC_RA RESPDAC_LL 1nF TO 10nF 1nF TO 10nF MUTUALLY EXCLUSIVE MUTUALLY EXCLUSIVE RESPIRATION DAC DRIVE + CABLE AND ELECTRODE IMPEDANCE < 1kΩ LL CABLE RA CABLE FILTER FILTER FILTER RESPIRATION MEASURE RESPIRATION DAC DRIVE – HPF IN-AMP AND ANTI-ALIASING MAGNITUDE AND PHASE SAR ADC LA CABLE ADAS1000 50kHz TO 56kHz 46.5kHz TO 64kHz OVERSAMPLED 1kΩ 10kΩ 10kΩ 10kΩ 10kΩ 1kΩ 100Ω 100Ω RESPDAC_LA RESPDAC_RA 1nF TO 10nF 1nF TO 10nF RESPIRATION DAC DRIVE + ve CABLE AND ELECTRODE IMPEDANCE < 1kΩ RA CABLE RESPIRATION MEASURE RESPIRATION DAC DRIVE – ve HPF IN-AMP AND ANTI-ALIASING MAGNITUDE AND PHASE SAR ADC EXT_RESP_LA EXT_RESP_RA REFOUT = 1.8V 0.9V GAIN 1/2 OF AD8606 1/2 OF AD8606 ±1V ±1V LPF fc=10kHz fc=150kHz 7Hz Rev. B | Page 40 of 80 |
|
Link URL |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link to Datasheet | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
