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Wideband (50 kHz) Patient-Worn Transmitters ............................................ 2-50
Narrowband (25 kHz) Patient-Worn Transmitter............................................2-56
VHF Telemetry Channel Frequencies...................................................................2-68
Patient-Worn Transmitters.......................................................................................... 3-1
Transmitter ECG PCBA Block Diagrams
(90341, 90343, 90347, 91341, 91343, and 91347) ......................................... 3-2
Transmitter ECG PCBA Description ................................................................. 3-3
Input Protection ......................................................................................................... 3-3
Lead Drive Switches ................................................................................................ 3-3
Input Buffers ............................................................................................................... 3-3
Lead Off Comparators ............................................................................................ 3-4
Differential Amplifiers .............................................................................................. 3-4
Pacer Blanking Switches ........................................................................................ 3-4
Bessel Filter ................................................................................................................. 3-4
Final ECG Amplifiers ................................................................................................ 3-4
DC Restoration Comparators ............................................................................... 3-4
Pacer Detection and Pacer Flag Generator .................................................... 3-4
Automatic Lead Switching PAL .......................................................................... 3-4
Transmitter RF PCBA Block Diagrams (90341, 90343, 90347) ............. 3-5
Transmitter RF PCBA Description (90341, 90343, 90347) ..................... 3-8
Status Mux ................................................................................................................... 3-8
ECG Mux ....................................................................................................................... 3-8
PWM PAL ..................................................................................................................... 3-8
PWM Ramp Generator ............................................................................................ 3-8
PWM Comparator ..................................................................................................... 3-8
PWM Data Formatter .............................................................................................. 3-8
PWM Filter ................................................................................................................... 3-8
Voltage Controlled Crystal Oscillator ............................................................... 3-9
First and Second Frequency Doublers ............................................................. 3-9
Transmitter RF PCBA Block Diagrams (91341, 91343, 91347) ................. 3-9
Transmitter RF PCBA Description (91341/91343/91347) .......................... 3-11
RF PCBA .......................................................................................................................3-11
Microcontroller ......................................................................................................... 3-14
Configuration SIP Switches ................................................................................. 3-14
2
PCBA Description (90343/91343 only) ..................... 3-16
Definitions and Acronyms ....................................................................................3-16
Electrical Requirements .........................................................................................3-16
Pulse Oximetry Sensor Drive ...............................................................................3-17
NIBP Interface (SpO
2
to ABP) ............................................................................3-17
Receiver Module ............................................................................................................3-21
Receiver Signal Flow ........................................................................................... 3-22
CPU (80C186) PCBA Description .................................................................... 3-23
Watchdog/Power Reset .......................................................................................3-23
SDLC Mainframe Interface ...................................................................................3-23
RUPI/80C186 Interface .........................................................................................3-24
ECG Data Interface .................................................................................................3-24
High-Level Outputs and Defibrillator Sync Input .......................................3-24
Configuration EEPROM .........................................................................................3-25
Front Panel LED Indicators .................................................................................3-25
Power Supply PCBA ............................................................................................ 3-26
Antenna PCBA ....................................................................................................... 3-26
RF PCBA .................................................................................................................. 3-26