marquette hellige MicroSmart - ECG Recording and Pre-Processing

Marquette Hellige GmbH MicroSmart V 2.xx Page 19
Servicing Instructions 227 470 35 B - 97.12
3.3.3 ECG recording and pre-processing
µ
C
SCLK
TSYNC
PCSO
Non Floating
MOSI
RESET
Floating
DC input
125 kHz
DC - DC
converter
+ 5 V
- 5 V
Sigma - Delta
Modulatos
SDM-HEC2
PA CE
Configuration
PACE - detection
(digital)
DIGI-HEC2
Referenz
Pre-amplifier
Protective input circuit
Digital-Filter
Digital-Filter
Re
s
u
l
t
m
e
m
o
r
y
Sigma - Delta
Modulators
SDM-HEC2
Patient lead
REF+ REF-
REF+ REF-
DVDD
AVDD
AVS S
AGND
Opto-
Koppler
Opto-
Koupler
Opto-
Koupler
Opto-
Koupler
Opto-
Koupler
Opto-
Koupler
Opto-
Koupler
MOSI
Q
S
P
I
-
i
n
t
e
r
f
a
c
e
A
n
a
l
o
g
s
w
i
t
c
h
P
A
C
E
-
d
e
t
e
c
t
i
o
n
(anal og)
MISO