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.