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ISDB-T 1-Segment Tuner
Table 5. VCO Register (continued)
BIT NAME
BIT LOCATION
(0 = LSB)
DEFAULT
FUNCTION
Select a particular sub-band for each of the on-chip VCOs. Together with the
VCO[1:0] bits a manual selection of a VCO band and a sub-band can be made.
This also serves as the starting point for the VCO autoselect mode when VASS =
VSB[3:0]
4, 3, 2, 1
0100
0.
0000 = Select sub-band 0.
0001 = Select sub-band 1.
…
1111 = Select sub-band 15.
Sets the VCO bias mode.
VCOB
0
1
0 = Normal mode.
1 = Low-power mode.
Table 6. PDET/RF-FILT Register
BIT NAME
BIT LOCATION
(0 = LSB)
DEFAULT
FUNCTION
Power detector and buffer mode.
00 = Power detector is enabled, PWRDET buffer is off. On-chip closed-loop RFAGC.
01 = Power detector is enabled, PWRDET buffer is on with detector RMS voltage
PDBM[1:0]
7, 6
00
output at PWRDET pin (RFAGC is open loop with RF gain controlled by voltage
applied to GC1).
10 = Unused.
11 = Power detector is enabled; PWRDET buffer is on with the GC1 voltage
output at PWRDET pin (on-chip closed loop RFAGC).
Sets the AGC attack point.
000 = -66dBm.
001 = -64dBm.
010 = -62dBm.
PDET[2:0]
5, 4, 3
100
011 = -60dBm.
100 = -58dBm.
101 = -56dBm.
110 = -54dBm.
111 = -52dBm.
Sets the center frequency of the UHF tracking filter when used.
RFLT[2:0]
2, 1, 0
011
000 = Minimum frequency (see Table 17).
------------
111 = Maximum frequency (see Table 17).
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