Trimble Outdoors SK8 - Manual (Page 64)

4-12 Lassen-SK8 Embedded GPS Module
Operation and Performance
Figure 4-1. Lassen-SK8 Block Diagram
Ant. Pwr
Protect/
Detect
RTC
SEE
ROM
4Mb
RAM
1 Mb
DUART
32 BIT
CPU
SK8 Functional Block Diagram
sk8fbd.dwg 12/28/95
Band Pass
Filter
PWR
MON
SCOTT
RF/IF
CUSTOM
IC
8 CHANNEL
GPS DSP
RESET
CONTROL
A/D, D/A, PWM
12.5 MHz TTL
12.504 MHz
12.504 MHz
Oscillator
32.768KHz
Crystal
SCORPION
CUSTOM IC
IF Filter
Backup Power
Base Band
Filter
Port A
Port B
RF IN
From Active antenna
(20 to 40 db gain)
Prime Power 1 PPS
I Q
TTL TTL
SClock
Calibration