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Single-Conversion DVB-H Tuner
Table 10. Shutdown Register (Address: 0x08)
BIT NAME
X
SHDN_REF
X
SHDN_SYN
SHDN_RF
SHDN_BB
SHDN_PD
SHDN_BG
BIT LOCATION
(0 = LSB)
7
6
5
4
3
2
1
0
FUNCTION
Reserved. Set to 0 for normal operation.
Crystal-oscillator buffer shutdown control:
1 = Buffered crystal-oscillator output is disabled.
0 = Buffered crystal-oscillator output is enabled.
Note: The crystal oscillator is activated by either the SHDN_SYN bit or the SHDN_REF bit. If
either bit is 0, the crystal oscillator is enabled. If both are 1, the crystal oscillator is disabled.
Reserved. Set to 0 for normal operation.
PLL shutdown control:
1 = PLL is disabled.
0 = PLL is enabled.
Note: The crystal oscillator is activated by either the SHDN_SYN bit or the SHDN_REF bit. If
either bit is 0, the crystal oscillator is enabled. If both are 1, the crystal oscillator is disabled.
RF front-end shutdown control:
1 = RF circuits are disabled.
0 = RF circuits are enabled.
Mixer, baseband filters, and baseband variable-gain amplifiers (VGA) shutdown control:
1 = Mixer, baseband filters, and baseband VGA are disabled.
0 = Mixer, baseband filters, and baseband VGA are enabled.
Baseband power-detector shutdown control:
1 = Baseband power detector is disabled.
0 = Baseband power detector is enabled.
Main bias shutdown control:
1 = Main bias circuits are disabled.
0 = Main bias circuits are enabled.
Note: The main bias circuits can and will be shut down once all other blocks are shut
down (all bits in the Shutdown register are set to 1, and the VCO[1:0] bits in the VCO
Control register and the DC_MO[1:0] in the DC Offset Control register are set to 00).
12
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