ADAS1000-4BSTZ datasheet(27/80 Pages) AD

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Data Sheet

ADAS1000-3/ADAS1000-4

21B

ECG INPUTS—ELECTRODES/LEADS

The ADAS1000-3/ADAS1000-4 ECG product consists of three

ECG inputs and a reference drive, RLD (right leg drive). In

a typical 3-lead/vector application, three of the ECG inputs

(ECG3_RA, ECG1_LA, ECG2_LL) are used in addition to the

RLD path.

In a 3-lead system, the ADAS1000-3/ADAS1000-4 can be

arranged to provide Lead I, Lead II, and Lead III data or

electrode data directly via the serial interface at all frame

rates. Note that in 128 kHz data rate, lead data is only available

when configured in analog lead mode. Digital lead mode is not

available for this data rate.

Should the user have a need for increased electrode counts, then

there are other products within the ADAS1000 family that may

be suitable. For example, a derived 12-lead (8-electrode) system

can be achieved using one ADAS1000-3 or ADAS1000-4

device ganged together with one ADAS1000-2 slave device

as described in the Gang Mode Operation section. Similarly,

a 12-lead (10-electrode) system can be achieved using one

ADAS1000 or ADAS1000-1 device ganged together with one

ADAS1000-2 slave device as described in the Gang Mode

Operation section. Here, nine ECG electrodes and one RLD

electrode achieve the 10 electrode system, again leaving one

spare ECG channel that could be used for alternate purposes

as suggested previously. In such a system, having nine dedi-

cated electrodes benefits the user by delivering lead information

based on electrode measurements and calculations rather than

deriving leads from other lead measurements.

Table 10 outlines the calculation of the leads (vector) from the

individual electrode measurements when using either the

ADAS1000-3 or ADAS1000-4.

Table 10. Lead Composition

Device

Lead Name

Composition

Equivalent

ADAS1000-3 or ADAS1000-4

LA – RA

LL – RA

III

LL – LA

aVR1

RA – 0.5 × (LA + LL)

−0.5 × (I + II)

aVL1

LA – 0.5 × (LL + RA)

0.5 × (I − III)

aVF1

LL – 0.5 × (LA + RA)

0.5 × (II + III)

These augmented leads are not calculated within the ADAS1000-3/ADAS1000-4, but can be derived in the host DSP/microcontroller/FPGA.

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