Single-Conversion DVB-H Tuner

______________________________________________________________________________________

13

BIT NAME

BIT LOCATION

(0 = LSB)

FUNCTION

VCO[1:0]

7, 6

Controls which VCO is activated when using manual VCO programming mode:

00 = VCO disabled.

01 = Select VCO 0 (lowest frequency VCO).

10 = Select VCO 1.

11 = Select VCO 2 (highest frequency VCO).

SB[2:0]

5, 4, 3

Selects which VCO sub-band is activated when using manual VCO programming mode:

000 = Select sub-band 0 (lowest frequency sub-band).

001 = Select sub-band 1.

010 = Select sub-band 2.

011 = Select sub-band 3.

100 = Select sub-band 4.

101 = Select sub-band 5.

110 = Select sub-band 6.

111 = Select sub-band 7 (highest frequency sub-band).

VAS

2

Enables or disables the VCO autotuner function:

1 = VCO and VCO sub-band are programmed automatically by the autotuner.

0 = VCO and VCO sub-band selection is controlled manually by programming the

VCO[1:0] and SB[2:0] bits.

ADL

1

Enables or disables the VCO tuning voltage ADC latch when the VCO autotuner is

disabled (VAS = 0):

1 = Latches the ADC output.

0 = Disables the ADC latch.

ADE

0

Enables or disables the VCO tuning voltage ADC read when the VCO autotuner is

disabled (VAS = 0):

1 = Enables ADC read.

0 = Disables ADC read.

Table 11. VCO Control Register (Address: 0x09)

BIT NAME

BIT LOCATION

(0 = LSB)

FUNCTION

BB_BW[3:0]

7–4

Programs the bandwidth of the baseband filter. Optimum values for 6MHz to 8MHz wide

channels can be calculated after reading a ROM table entry. See the Reading the ROM

Table section.

BB_BIA

3

Baseband filter bias current control:

1 = High-bias current.

0 = Low-bias current.

PD_TH[2:0]

2, 1, 0

Programs the power-detector attack point for closed-loop RF gain control; see the

Typical Operating Characteristics for power-detector behavior:

000 = Most aggressive RF gain reduction.

001

…

110

Table 12. Baseband Control Register (Address: 0x0A)