ISDB-T 1-Segment Tuner

14

______________________________________________________________________________________

BIT NAME

BIT LOCATION

(0 = LSB)

DEFAULT

FUNCTION

CP[1:0]

7, 6

00

Sets the charge-pump current.

00 = 1.5mA.

01 = 2mA.

10 = 2.5mA.

11 = 3mA.

X

5

0

Factory use only. Must be programmed to 0 upon power-up.

DRFD

4

1

Disable RF Detector

0 = Enables the wideband RF overload detector.

1 = Disables the wideband RF overload detector.

RFDA[1:0]

3, 2

11

Sets the RF overload detector attack point (subtract 6dB to each if PDIQ = 0).

00 = +37dB relative to IF attack point setting.

01 = +34dB relative to IF attack point setting.

10 = +31dB relative to IF attack point setting.

11* = +28dB relative to IF attack point setting.

*Only 11 is factory tested.

X

1

1

Factory use only. Must be programmed to 1 upon power-up.

R0

0

0

LSB of reference divider number

Table 9. R-Divider LSB/CP Register

Note: When changing R-divider value, both registers R-Divider MSB and R-Divider LSB must be loaded as they are double buffered.

BIT NAME

BIT LOCATION

(0 = LSB)

DEFAULT

FUNCTION

RFVB

7

0

Bypass 3rd-stage RFVGA.

0 = Enables 3rd-stage RFVGA.

1 = Disables the 3rd-stage RFVGA.

RFFB

6

0

Bypass integrated RF filter.

0 = Enables optional RF filter.

1 = Disables optional RF filter.

HSLS

5

0

Selects between high-side and low-side LO injection.

1 = Low-side injection.

0 = High-side injection.

X

4, 3, 2, 1, 0

0

Factory use only. Must be programmed to 0 upon power-up.

Table 7. MODE Register

BIT NAME

BIT LOCATION

(0 = LSB)

DEFAULT

FUNCTION

R[8:1]

7, 6, 5, 4, 3, 2,

1, 0

00111111

Sets the PLL reference divider (R) number. Default R divide value is 126

decimal. R can range from 16 to 511 decimal.

Table 8. R-Divider MSB Register

Note: When changing R-divider value, both registers R-Divider MSB and R-Divider LSB must be loaded as they are double buffered.