ADAS1000BSTZ datasheet(33/80 Pages) AD

33 / 80 page

Data Sheet

ADAS1000/ADAS1000-1/ADAS1000-2

Rev. A | Page 33 of 80

DEFIBRILLATOR PROTECTION

The ADAS1000/ADAS1000-1/ADAS1000-2 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/ADAS1000-1/ADAS1000-2 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

connect 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

(re-directed 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

Ω

ECG1

500

Ω

500

Ω

ELECTRODE

PATIENT

CABLE

Ω

ECG2

RLD

22M

Ω1

22M

Ω1

ARGON/NEON

BULB

ARGON/NEON

BULB

1OPTIONAL.

SP724

AVDD

SP724

AVDD

500

Ω

500

Ω

ADAS1000/

ADAS1000-1/

ADAS1000-2

ELECTRODE

PATIENT

CABLE

4.5k

Ω

ADAS1000/

ADAS1000-1/

ADAS1000-2

500Ω

ELECTRODE

PATIENT

CABLE

4.5kΩ

500Ω

RLD

22M

Ω1

22M

Ω1

AVDD

1OPTIONAL.

2TWO SP724 CHANNELS PER ELECTRODE MAY PROVIDE BEST PROTECTION.

SP7242

ECG1

ECG2

INPUT AMPLIFIER

RLD AMP

DCLO

CURRENT

ACLO

CURRENT

RESPIRATION

INPUT

CALDAC

CHANNEL

ENABLE

ECG PIN

1.3V VCM_REF

–

TO CM

AVERAGING

FROM CM

AVERAGING

FILTERING

ADAS1000

VCM

MUX FOR LEAD CONFIG,

COMMON ELECTRODE

–

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