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Rainbow Electronics MAX3541 User Manual

Page 12

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MAX3541

Complete Single-Conversion
Television Tuner

12

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BIT NAME

BIT LOCATION (0 = LSB)

RECOMMENDED

DEFAULT

FUNCTION

RESERVED

7

0

Must be set to 0.

IFOVLD[2:0]

6-4

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

Selects the tracking filter band of operation.
0 = VHF
1 = UHF

RESERVED

0

0

Must be set to 0.

Table 6. IFOVLD, 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

S H DN _IFV GA

2

0

IF VGA shutdown.
0 = IF VGA enabled
1 = IF VGA disabled

INPT[1:0]

1-0

01

Selects the RF input.
00 = Selects VHF_IN, LPF enabled
01 = Selects VHF_IN, LPF disabled
10 = Selects UHF_IN
11 = Factory use only

Table 7. Control Register (Address: 0101

b

)

BIT NAME

BIT LOCATION (0 = LSB)

RECOMMENDED

DEFAULT

FUNCTION

SHDN_MIX

7-6

00

Mixer shutdown.
00 = Mixer enabled
01,10 = Factory use only
11 = Mixer disabled

SHDN_IF

5

0

IF shutdown.
0 = IF section enabled
1 = IF section disabled

SHDN_OD

4

0

IFOVLD shutdown.
0 = Power detector enabled
1 = Power detector disabled

SHDN_SYN

3

0

Frequency synthesizer shutdown.
0 = Synthesizer enabled
1 = Synthesizer disabled

RESERVED

2-0

000

Must be set to 000.

Table 8. Shutdown Register (Address: 0110

b

)