Datasheet

Multiband Analog and
Digital Television Tuner
MAX3543
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Table 4. R00: VCO Register—VCO and LO Divider Control (Address: 00h)
Table 5. R01: NDIV INT Register—Integer Part of N-Divider (Address: 01h)
Table 6. R02: NDIV FRAC2 Register—N-Divider Fractional Part [19:16] and R-Divider
(Address: 02h)
Register and Bit Descriptions
BIT NAME
BIT LOCATION
(0 = LSB)
TYPICAL
SETTING
FUNCTION
VCO[1:0] 7:6 01
VCO select. Selects one of three VCOs when VAS = 0, or selects the VCO starting
band when VASS = 0.
00 = Selects VCO1 (approximately 2200MHz to 2800MHz)
01 = Selects VCO2 (approximately 2800MHz to 3500MHz)
10 = Selects VCO3 (approximately 3500MHz to 4400MHz)
11 = VCO shutdown
VSUB[3:0] 5:2 0011
VCO sub-band select. Selects one of 16 possible VCO sub-bands when VAS = 0,
or selects the VCO starting sub-band when VASS = 0.
0000 = Selects SB0
…
1111 = Selects SB15
VDIV[1:0] 1:0 00
VCO divider ratio select.
00 = Sets VCO divider to 4 (use when f
LO
> 550MHz)
01 = Sets VCO divider to 8 (use when 275MHz < f
LO
< 550MHz)
10 = Sets VCO divider to 16 (use when 137.5MHz < f
LO
< 275MHz)
11 = Sets VCO divider to 32 (use when f
LO
< 137.5MHz)
BIT NAME
BIT LOCATION
(0 = LSB)
TYPICAL
SETTING
FUNCTION
NINT[7:0] 7:0
0010
1011
Sets the PLL integer divide number (N)
BIT
NAME
BIT LOCATION
(0 = LSB)
TYPICAL
SETTING
FUNCTION
CPS 7 1
Sets the charge-pump current-selection mode between automatic and manual.
Must set to 1 for proper operation.
CP 6 0 For Maxim use only
RDIV[1:0] 5:4 00
Reference divider.
00 = /1
01 = /2
1X = Maxim use only
F[19:16] 3:0 1110 N-divider fractional part bits 19:16 (out of 19:0)