Datasheet

Multiband Analog and
Digital Television Tuner
MAX3543
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Table 7. R03: NDIV FRAC1 Register—N-Divider Fractional Part [15:8] (Address: 03h)
Table 8. R04: NDIV FRAC0 Register—N-Divider Fractional Part [7:0] (Address: 04h)
Table 9. R05: MODE CTRL Register—Mode Control (Address: 05h)
Table 10. R06: TFS Register—Tracking Filter Series Capacitor (Address: 06h)
BIT NAME
BIT LOCATION
(0 = LSB)
TYPICAL
SETTING
FUNCTION
F[15:8] 7:0 0010 0110 N-divider fractional part bits 15:8 (out of 19:0)
BIT NAME
BIT LOCATION
(0 = LSB)
TYPICAL
SETTING
FUNCTION
F[7:0] 7:0
0110
0110
N-divider fractional part bits 7:0 (out of 19:0). Writing this register also triggers VCO
autoselect (VAS).
BIT NAME
BIT LOCATION
(0 = LSB)
TYPICAL
SETTING
FUNCTION
LNA2G 7 1
Premixer gain configuration. Set to 1 for nominal gain. Set to 0 for approximately
2.5dB reduced gain.
RFIN 6 1
0 = Selects RFINL input (for f
RF
< 345MHz)
1 = Selects RFINH input (for f
RF
> 345MHz)
RFLPF 5 0
0 = Disables RF LPF (for f
RF
> 110MHz)
1 = Enables RF LPF (for f
RF
< 110MHz)
CHBW 4 1
0 = Sets IF BW to 7MHz mode
1 = Sets IF BW to 8MHz mode
TFB[1:0] 3:2 10
Selects the tracking filter band of operation.
00 = VHFL (for f
RF
< 196MHz)
01 = VHFH (for 196MHz < f
RF
< 440MHz
10 = UHF (for f
RF
> 440MHz)
11 = Unused
IFSEL[1:0] 1:0 00
IF output selection.
00 = IFOUT1 DTV differential mode (for driving a differential bandpass filter)
01 = IFOUT1 DTV single-ended (for driving a switched BW single-ended SAW filter)
10 = IFOUT2 ATV single-ended
11 = Unused
BIT
NAME
BIT LOCATION
(0 = LSB)
TYPICAL
SETTING
FUNCTION
TFS[7:0] 7:0 N/A
Programs series capacitor values in the tracking filter. The value is determined
from the values in the ROM table applied to an equation executed in the Maxim-
provided device driver code.