Rainbow Electronics MAX3540 - Manual (Page 8)

MAX3540
Complete Single-Conversion Television Tuner
8 _______________________________________________________________________________________
BIT NAME BIT LOCATION (0 = LSB)
RECOMMENDED
DEFAULT
FUNCTION
RESERVED 7 0 Must be set to 0.
IFO V LD [ 2:0] 6, 5, 4 000 Write content of ROM register OD[2:0] to this location.
CP[1:0] 3, 2 00
Selects the typical charge-pump current.
00 = 0.5mA
01 = 1mA
10 = 1.5mA
11 = 2mA
TF[1:0] 1, 0 00
Selects the tracking filter band of operation.
00 = VHF low
01 = VHF high
10 = UHF
11 = factory use only
Table 6. RSSI, Charge Pump, and Filter Select Register (Address: 0100
b
)
BIT NAME BIT LOCATION (0 = LSB)
RECOMMENDED
DEFAULT
FUNCTION
RESERVED 7–4 0000 Must be set to 0000.
SHDN_RF 3 0
RF shutdown.
0 = RF circuitry enabled
1 = RF circuitry disabled
SHDN_IFV
GA
2 1
IF VGA shutdown.
0 = IF VGA enabled
1 = IF VGA disabled
INPT[1:0] 1, 0 00
Selects the RF input.
00 = selects VHF_IN with LPF
01 = selects VHF_IN, no LPF
10 = selects UHF_IN
11 = factory use only
Table 7. Control Register (Address: 0101
b
)