Mindray Passport 5-Lead, Service Manual

Page: 216 / 544

Block Diagrams Theory of Operation
2 - 14 0070-00-0420 Passport 5-Lead, 5L, LT, XG Service Manual
FIGURE 2-6
Overall Front End Block Diagram
FIGURE 2-7 ECG Pre-Amp Block Diagram
ECG PRE AMP
DAUGHTER BD.
RESP.
PRE AMP
RRA
RLA
PRESSURE
PRE AMP
PRESSURE
PRE AMP
+ OUT P1
- OUT P1
+ OUT P2
- OUT P2
TIP
RING
SLEEVE
TEMP.
PRE AMP
LEAD SEL
LEAD FAULT
E TRIGGER
ECG FILTER
ESU NOISE
ECGRM
ECG RE SET
RESP
OFF/O N
HI Z
RESP RESET
RESP FLT
115KHZ
PRESS 1
P TRIGGER
PRESS 2
T FLAG
TE MP
TA
TB
TC
TD
+5V
+5V T
+7.5V
-7.5 V
GND
REGULATOR
TRACKING
REGULATOR
POWER
ISOLATION
A/D
CONVERTER
VDC
PGND
AD
D
R
ES
S
I/O
C
L
O
C
K
DAT
A
O
U
T
SELEC
T
MICRO
CONTROLLER
DATA IN
DATA IN
DATA OUT
DATA OUT
RESET
RESET
+5V
DGND
RESP RESET
115KHZ
ES U NOISE
RESP FLT
TD
TC
TB
TA
T FLAG
P TRIGGER
HI Z
OFF/ON
E TRIGGER
LEAD FAULT
ECG FILTER
ECG RESET
LEAD SELECT
S
IG
N
A
L
D
A
T
A
IS
O
L
A
T
IO
N
+5T
+ IN
- IN
SHIELD
RA
LA
RL
LL
C
RA
LA
LL
C
RL
SHIELD
Wilson
Network
Lead
Select
Mux
U1
U1
U1
U1
Drive
Mux
U2,U3
U4
CR5
CR6
5
4
10
14
16
1
8
ESIS
Stage 2 ESIS
Stage 3
ECG Pre-Amp
Lead Buffers