Datasheet

MAX2121
Complete Direct-Conversion L-Band Tuner
13
Table 11. Control Register (Address: 0x09)
BIT NAME BIT LOCATION (0 = LSB) DEFAULT FUNCTION
STBY 7 0
Software standby control.
0 = Normal operation.
1 = Disables the signal path and frequency synthesizer leaving only the
2-wire bus, crystal oscillator, XTALOUT buffer, and XTALOUT buffer divider
active.
X 6 X Don’t care.
PWDN 5 0
Factory use only.
0 = Normal operation; other value is not tested.
X 4 X Don’t care.
BBG[3:0] 3–0 0000
Baseband gain setting (1dB typical per step).
0000 = Minimum gain (0dB, default).
…
1111 = Maximum gain (15dB typical).
Table 12. Shutdown Register (Address: 0x0A)
BIT NAME BIT LOCATION (0 = LSB) DEFAULT FUNCTION
X 7 X Don’t care.
PLL 6 0
PLL enable.
0 = Normal operation.
1 = Shuts down the PLL. Value not tested.
DIV 5 0
Divider enable.
0 = Normal operation.
1 = Shuts down the divider. Value not tested.
VCO 4 0
VCO enable.
0 = Normal operation.
1 = Shuts down the VCO. Value not tested.
BB 3 0
Baseband enable.
0 = Normal operation.
1 = Shuts down the baseband. Value not tested.
RFMIX 2 0
RF mixer enable.
0 = Normal operation.
1 = Shuts down the RF mixer. Value not tested.
RFVGA 1 0
RF VGA enable.
0 = Normal operation.
1 = Shuts down the RF VGA. Value not tested.
FE 0 0
Front-end enable.
0 = Normal operation.
1 = Shuts down the front-end. Value not tested.