Rainbow Electronics MAX3540 User Manual
Page 8
MAX3540
Complete Single-Conversion Television Tuner
8
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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
)