ADAS1000-4BSTZ datasheet(39/80 Pages) AD

39 / 80 page

Data Sheet

ADAS1000-3/ADAS1000-4

External Respiration Path

The EXT_RESP_xx pins are provided for use either with the

ECG electrode cables or, alternatively, with a dedicated external

sensor independent of the ECG electrode path. Additionally, the

EXT_RESP_xx pins are provided so the user can measure the

respiration signal at the patient side of any input filtering on the

front end. In this case, the user must continue to take precautions

to protect the EXT_RESP_xx pins from any signals applied that

are in excess of the operating voltage range (for example, ESIS

or defibrillator signals).

External Respiration Capacitors

If necessary, the ADAS1000-4 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 68 shows the

connections at RESPDAC_xx paths for the extended respiration

configuration. Again, the EXT_RESP_xx paths can be con-

nected 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) may

be required.

Figure 68. Respiration Measurement Using External Capacitor

LA CABLE

ECG1_LA

EXT_RESP_LA

ECG2_LL

EXT_RESP_LL

ECG3_RA

EXT_RESP_RA

ADAS1000-4

46.5kHz TO

64kHz

46.5kHz TO

64kHz

OVERSAMPLED

5kΩ

1kΩ

5kΩ

100pF

RESPDAC_LA

RESPDAC_RA

RESPDAC_LL

1nF TO 10nF

MUTUALLY

EXCLUSIVE

MUTUALLY

EXCLUSIVE

RESPIRATION DAC

DRIVE +

CABLE AND ELECTRODE

IMPEDANCE < 1kΩ

LL CABLE

RA CABLE

FILTER

RESPIRATION

MEASURE

RESPIRATION DAC

DRIVE –

HPF

IN-AMP AND

ANTI-ALIASING

MAGNITUDE

AND

PHASE

SAR

ADC

±1V

LPF

Rev. B | Page 39 of 80

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