Figure 3-55. Gps Block Diagram - Motorola APX 7000 Detailed Service Manual

3-72
• The GPS TX output (U2206 pin J6 for MHLN6977 and pin F5 for MHLN7035), connects to
OMAP UART2_RX (U6302 pin R9) – TP2205
• The GPS RX input (U2206 pin K6 for MHLN6977 and pin E3 for MHLN7035) connects to
OMAP UART2_TX (U6302 pin M18) – TP2206
NOTE:
• SAW filter FL1301 is used by all APX7000/ APX 7000XE radios with expander board
HLN7035A.
.
RF-Vocon-Exp
Interconnect
RF Board
Ant
3.0V
LNA
Figure 3-55. GPS Block Diagram (VHF/700–800 MHz) – Expander Board MHLN6977A
3.6V
(VSW_3.6)
LNA Enable
GPS_2.8V
Balanced
Unbalanced
LNA
SAW
SAW
Theory of Operation
External Regulators
2.8V 1.8V 1.2V
RF Vcc I/O Vcc Core Vdd
FDOUT
(H1)
REF_CLK_IN
RFA_INP
(A5)
RFA_INM
(B5)
MISO_TXD0
GPS IC MOSI_RXD0
SiRF GSCi-5001
LOW_REF_CLKI
: Global Positioning System (GPS)
Expansion Board
GPS_2.8V
TCXO
(D4)
26MHz
<0.5ppm
[OMAP 1710]
GPS Tx
(J6)
UART2_Rx
GPS Rx
UART2_Tx
(K6)
32kHz RTC
(D1)
IO74
Reset
NRESET
IO91
(C1)
(R9)
(M18)
(E2)
(D12)