Rainbow Electronics MAX3540 User Manual
Page 7
MAX3540
Complete Single-Conversion Television Tuner
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7
BIT NAME
BIT LOCATION (0 = LSB)
RECOMMENDED
DEFAULT
FUNCTION
RESERVED
7
0
Must be set to 0.
R[6:0] 6–0 100
0000
Sets the PLL reference divider (R). Default reference divider value
is R = 64. R can range from 16 to 127.
Table 4. R-DIV Register (Address: 0010
b
)
BIT NAME
BIT LOCATION (0 = LSB)
RECOMMENDED
DEFAULT
FUNCTION
VCO[4:3]
7, 6
01
VCO select. Selects one of three possible VCOs.
00 = VCOs shut down
01 = selects VCO1
10 = selects VCO2
11 = selects VCO3
VCO[2:0]
5, 4, 3
101
VCO sub-band select. Selects one of eight possible VCO sub-bands.
000 = selects SB0
001 = selects SB1
010 = selects SB2
011 = selects SB3
100 = selects SB4
101 = selects SB5
110 = selects SB6
111 = selects SB7
LD
2
1
Lock-detect enable.
0 = disabled
1 = enabled
VDIV[1:0]
1, 0
01
VCO divider ratio select.
00 = sets V C O d i vi d er to 4
01 = sets V C O d i vi d er to 8
10 = sets VCO divider to 16
11 = sets VCO divider to 32
Table 5. VCO Register (Address: 0011
b
)
BIT NAME
BIT LOCATION (0 = LSB)
RECOMMENDED
DEFAULT
FUNCTION
N[7:0]
7–0
0101 0000
Sets the least significant bits of the PLL integer divider (N). Default
integer divider value is N = 4688. N can range from 256 to 32,767.
Table 3. N-DIV Low Register (Address: 0001
b
)