MAX3540 データシートの表示（PDF） - Maxim Integrated

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MAX3540

Complete Single-Conversion Television Tuner

Maxim Integrated 

Complete Single-Conversion Television Tuner

Table 6. RSSI, Charge Pump, and Filter Select Register (Address: 0100b)

BIT NAME

BIT LOCATION (0 = LSB)

RECOMMENDED

DEFAULT

FUNCTION

RESERVED

IFOVLD[2:0]

7

6, 5, 4

0

Must be set to 0.

000

Write content of ROM register OD[2:0] to this location.

CP[1:0]

3, 2

Selects the typical charge-pump current.

00 = 0.5mA

00

01 = 1mA

10 = 1.5mA

11 = 2mA

TF[1:0]

1, 0

Selects the tracking filter band of operation.

00 = VHF low

00

01 = VHF high

10 = UHF

11 = factory use only

Table 7. Control Register (Address: 0101b)

BIT NAME BIT LOCATION (0 = LSB) RECOMMENDED

DEFAULT

RESERVED

7–4

0000

Must be set to 0000.

SHDN_RF

3

RF shutdown.

0

0 = RF circuitry enabled

1 = RF circuitry disabled

SHDN_IFV

2

GA

IF VGA shutdown.

1

0 = IF VGA enabled

1 = IF VGA disabled

FUNCTION

INPT[1:0]

1, 0

Selects the RF input.

00 = selects VHF_IN with LPF

00

01 = selects VHF_IN, no LPF

10 = selects UHF_IN

11 = factory use only

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