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ISDB-T Single-Segment Low-IF Tuners
Table 6. XTAL Divide
BIT NAME
BIT LOCATION
(0 = LSB)
RECOMMENDED
DEFAULT
FUNCTION
Set the crystal divider ratio for XTALOUT.
00000 = XTALOUT buffer disabled (off)
00001 = divide-by-1
XD[4:0]
7–3
00001
00010 = divide-by-2
00011 = divide-by-3
00100 = divide-by-4
00101 through 11110 = all divide values from 3 (00101) to 30 (11110)
11111 = divide-by-31
Software power-down control.
PWDN
2
0
0 = normal operation
1 = shuts down the entire chip but leaves the 2-wire bus active and maintains
the current register states
Software standby control.
STBY
1
0
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
Enables and disables the Q-channel output.
QOFF
0
0
0 = Q channel enabled
1 = Q channel disabled
Table 7. R-Divider Register
BIT NAME
R[7:0]
BIT LOCATION
(0 = LSB)
7–0
RECOMMENDED
DEFAULT
0x38
FUNCTION
Set the PLL reference-divider (R) number. Default R-divider value is 56 decimal.
R can range from 22 to 182 decimal.
Table 8. N-Divider MSB Register
BIT
NAME
N[12:5]
BIT LOCATION
(0 = LSB)
7–0
RECOMMENDED
DEFAULT
0x53
FUNCTION
Set the most significant bits of the PLL integer-divider number (N). Default
integer-divider value is N = 2687 decimal. N can range from 829 to 5374.
Table 9. N-Divider LSB Register
BIT NAME
N[4:0]
X
BIT LOCATION
(0 = LSB)
7–3
2, 1, 0
RECOMMENDED
DEFAULT
11111
X
FUNCTION
Set the least significant bits of the PLL integer-divider number (N). Default
integer-divider value is N = 2687 decimal. N can range from 829 to 5374.
Unused.
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