ADAS1000 datasheet(32/80 Pages) AD

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ADAS1000/ADAS1000-1/ADAS1000-2

Data Sheet

Figure 60. Electrode and Lead Configurations, Common Electrode A

Figure 61. Electrode and Lead Configurations, Single-Ended Input Electrode

VCM = RA

COMMON-

MODE AMP

AMP

ADC

CM_IN = RA

COMMON

ELECTRODE CE IN

–

CM_OUT/WCT

AMP

–

AMP

–

AMP

–

AMP

–

ECG1_LA

ECG2_LL

ECG3_RA = V3

ECG4_V1

ECG5_V2

MODE

COMMENT

WORD1

WORD2

WORD3

WORD4

WORD5

COMMON

ELECTRODE (CE)

LEADS (HERE RA

ELECTRODE IS

CONNECTED TO THE

CE ELECTRODE

(CM_IN) AND V3 IS ON

ECG3 INPUT)

LEAD I

(LA − RA)

LEAD II

(LL − RA)

V3’

(V3 – RA) − (LA − RA) − (LL − RA)

V1’

(V1 − RA) − (LA − RA) + (LL − RA)

V2’

(V2 − RA) − (LA − RA) + (LL − RA)

COMMON

ELECTRODE A

0x0A

[4]1

0x01

[10]2

0x05

[8]3

1REGISTER FRMCTL, BIT DATAFMT: 0 = LEAD/VECTOR MODE; 1 = ELECTRODE MODE.

2REGISTER ECGCTL, BIT CHCONFIG: 0 = SINGLE ENDED INPUT (DIGITAL LEAD MODE OR ELECTRODE MODE); 1 = DIFFERENTIAL IN PUT (ANALOG LEAD MODE).

3REGISTER CMREFCTL, BIT CEREFEN: 0 = CE DISABLED; 1 = CE ENABLED.

LEAD I

LEAD II

V3’

V1’

V2’

DIGITAL DOMAIN

CALCULATIONS

VCM = ( LA+ LL + RA + V1)/

4 IN THIS CASE

COMMON-

MODE AMP

AMP

ADC

CM_IN

FOR EXAMPLE, RA

COMMON

ELECTRODE CE IN

–

CM_OUT/WCT

LA – VCM

LL – VCM

RA – VCM

V1 – VCM

V2 – VCM

VCM COMMON MODE

CAN BE ANY COMBINATION

OF ELECTRODES

AMP

–

AMP

–

AMP

–

AMP

–

ECG1_LA

ECG 2_LL

ECG3_RA

ECG4_V1

ECG5_V2

MODE

COMMENT

WORD1

WORD2

WORD3

WORD4

WORD5

SINGLE-ENDED

INPUT ELECTRODE

RELATIVE TO VCM

LL − VCM

SINGLE-ENDED

INPUT

ELECTRODE

0x0A

[4]1

0x01

[10]2

0x05

[8]3

LA − VCM

RA − VCM

V1 − VCM

V2 − VCM

1REGISTER FRMCTL, BIT DATAFMT: 0 = LEAD/VECTOR MODE; 1 = ELECTRODE MODE.

2REGISTER ECGCTL, BIT CHCONFIG: 0 = SINGLE ENDED INPUT (DIGITAL LEAD MODE OR ELECTRODE MODE); 1 = DIFFERENTIAL IN PUT (ANALOG LEAD MODE).

3REGISTER CMREFCTL, BIT CEREFEN: 0 = CE DISABLED; 1 = CE ENABLED.

Rev. B | Page 32 of 80

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