Datasheet

Data Sheet ADAS1000-3/ADAS1000-4
Rev. A | Page 29 of 76
Figure 55. Flexible Front-End Configuration—Showing Analog Lead Mode Configuration Relative to Wilson Central Terminal (WCT)
Figure 56. Flexible Front-End Configuration—Showing Single-Ended Electrode Configuration
Figure 57. Flexible Front-End Configuration—Showing Common Electrode Configuration
VCM = WCT = (LA + LL + RA)/3
COMMON-
MODE AMP
ECG1_LA
ECG2_LL
ECG3_RA
AMP
ADC
ADC
ADC
CM_IN
for example RA
+
–
CM_OUT/WCT
LEAD I
(LA – RA)
LEAD III
(LL – LA)
LEAD II
(LL – RA)*
ECGCTL 0x01[10] CHCONFIG = 1
FRMCTL 0x0A[4] DATAFMT = 0
DIFFERENTIAL INPUT – LEAD FORMAT
*MULTIPLIED BY –1
IN DIGITAL MODE
AMP
+
–
AMP
+
–
10997-015
COMMON
ELECTRODE (CE) IN
VCM
COMMON-
MODE AMP
AMP
ADC
ADC
ADC
CM_IN
for example, RA
FRMCTL 0x0A[4] = 0 CONFIGURES
SINGLE-ENDED LEAD FORMAT
WHERE LEADS ARE CALCULATED
DIGITALLY AFTER ADC PROCESSING.
+
–
CM_OUT/WCT
LA – VCM
LL – VCM
RA – VCM
ECGCTL 0x01[10] CHCONFIG = 0
FRMCTL 0x0A[4] DATAFMT = 1
SINGLE-ENDED ELECTRODE FORMAT
COMMON MODE
CAN BE ANY
COMBINATION
OF ELECTRODES
AMP
+
–
AMP
+
–
ECG1_LA
ECG 2_LL
ECG3_RA
COMMON
ELECTRODE (CE) IN
10997-016
VCM = RA
COMMON-
MODE AMP
AMP
ADC
ADC
ADC
CM_IN = RA
COMMON
ELECTRODE (CE) IN
FRMCTL 0x0A[4] = 0 CONFIGURES
SINGLE-ENDED ELECTRODE FORMAT
WHERE LEADS ARE CALCULATED
DIGITALLY AFTER ADC PROCESSING.
+
–
CM_OUT/WCT
LA – RA
LL – RA
V1 – RA
ECGCTL 0x01[10] CHCONFIG = 0
FRMCTL 0x0A[4] DATAFMT = 1
CMREFCTL 0x05[8] CEREFEN = 1
SINGLE-ENDED ELECTRODE FORMAT
AMP
+
–
AMP
+
–
ECG1_LA
ECG2_LL
ECG3_RA = V1
10997-017