Complete Dual-Band
Quadrature Transmitter
14   ______________________________________________________________________________________
Table 5. Power-Down Modes
Table 6. Register and Control Pin States for Key Operating Modes
X = Dont care
OFF
POWER-DOWN MODES
COMMENTS
SHDN pin
Ultra-low shutdown current
X
X
X
X
X
X
X
X
X
TXGATE pin
For punctured TX mode
X
X
IF PLL SHDN
For external IF PLL use
X
X
TX STBY
TX is off, but IF LO stays locked
X
X
REG STBY
Shuts down, but preserves registers
X
X
X
X
X
REG SHDN
Serial bus is still active
X
X
X
X
X
X
X
X
OPCTRL REGISTER
C O N T R
O L
PINS
MODE
DESCRIPTION
PCS Digital
RFH selected
0
11
1
1
1
1
1
H
H
Cellular Digital
RFL selected
1
01
1
1
1
1
1
H
H
FM
Direct VCO modulation, RFL selected
1
00
0
1
1
1
1
H
H
FM_IQ
FM with IQ modulation, RFL selected
1
00
1
1
1
1
1
H
H
PCS TXGATE
Gated transmission, PCS
0
11
1
1
X
1
1
L
H
Cellular TXGATE
Gated transmission, cellular digital
1
01
1
1
X
1
1
L
H
Sleep
Everything off
X
XX     X
X
X
X
X
X
L
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