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Service Manual
3. Baseband Section
12
3.2.6 Clock
The system needs three clocks for operation: system clock, clock for RTC on OMAP-L138,
and clock for the control head MCU. The system clock is provided by 19.2 MHz TCXO or an
externally calibrated 19.2 MHz clock source. Clock for RTC on OMAP-L138 is generated by
the 32.768 kHz crystal oscillator. The clock used by the MCU for the control head is provided
from the 12 MHz crystal oscillator. Diagram of clock distribution is shown in Figure 3-5.
OMAP-L138
CLK
32K
32768 Hz
Crystal
32768 Hz
19.2 MHz
TCXO
Buffer
PLL
SKY72310
Audio Codec
TLV320AIC29
MCLK
CLKOUT
19.2 MHz
Noise Reduction IC
BR261W26
19.2 MHz 0.8-1V
19.2 MHz 3.3V
Filter
19.2 MHz <1.2V
19.2 MHz <2V
Filter
Exit CLK
SPDT
External
19.2 MHz
19.2 MHz 0.8-1V
Clock Select Control
OMAP-L138
CLK
32K
Audio Codec
TLV320AIC29
MCLK
CLKOUT
19.2 MHz
Noise Reduction IC
BR261W26
Exit CLK
32768 Hz
Crystal
32768 Hz
Filter
19.2 MHz <1.2V
19.2 MHz
TCXO
Buffer
PLL
SKY72310
19.2 MHz 0.8~1V
19.2 MHz 3.3V
19.2 MHz <2V
Filter
19.2 MHz <3.3V
Filter
IF Processor
AD9864
LPC1774
CLK
32K
32768 Hz
Crystal
32768 Hz
12 MHz
Crystal
12 MHz
Control Head
Transmitter Circuit
Receiver Circuit
Figure 3- 5 Diagram of Clock Distribution
Содержание RDR9000
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Страница 46: ...Service Manual 6 UHF1 400 470 MHz Information 36 PCB View Main Board Bottom Layer ...
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Страница 49: ...Service Manual 6 UHF1 400 470 MHz Information 39 PCB View Rear Board Bottom Layer Figure 6 5 PCB View ...
Страница 146: ...Service Manual 7 UHF3 350 400 MHz Information 136 7 4 PCB View PCB View Main Board Top Layer ...
Страница 147: ...Service Manual 7 UHF3 350 400 MHz Information 137 PCB View Main Board Bottom Layer ...
Страница 148: ...Service Manual 7 UHF3 350 400 MHz Information 138 PCB View Control Head Top Layer PCB View Control Head Bottom Layer ...
Страница 149: ...Service Manual 7 UHF3 350 400 MHz Information 139 PCB View Rear Board Top Layer ...
Страница 150: ...Service Manual 7 UHF3 350 400 MHz Information 140 PCB View Rear Board Bottom Layer Figure 7 5 PCB View ...
Страница 248: ...Service Manual 8 VHF 136 174 MHz Information 238 8 4 PCB View PCB View Main Board Top Layer ...
Страница 249: ...Service Manual 8 VHF 136 174 MHz Information 239 PCB View Main Board Bottom Layer ...
Страница 250: ...Service Manual 8 VHF 136 174 MHz Information 240 PCB View Control Head Top Layer PCB View Control Head Bottom Layer ...
Страница 251: ...Service Manual 8 VHF 136 174 MHz Information 241 PCB View Rear Board Top Layer ...
Страница 252: ...Service Manual 8 VHF 136 174 MHz Information 242 PCB View Rear Board Bottom Layer Figure 8 5 PCB View ...
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