MAX2120(2007) 查看數據表（PDF） - Maxim Integrated

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MAX2120
(Rev.:2007)

Complete, Direct-Conversion Tuner for DVB-S and Free-to-Air Applications

Maxim Integrated 

Complete, Direct-Conversion Tuner for DVB-S

and Free-to-Air Applications

Table 4. Charge-Pump Register

BIT NAME

BIT LOCATION (0 = LSB)

CPMP[1:0]

7, 6

CPLIN[1:0]

5, 4

X

3–0

DEFAULT

00

00

X

FUNCTION

Charge-pump minimum pulse width. Users must program to 00

upon powering up the device.

Controls charge-pump linearity.

00 = Typically balanced charge and sink currents.

Other values are not tested.

Don’t care.

Table 5. XTAL Buffer and Reference Divider Register

BIT NAME

XD[2:0]

R[4:0]

BIT LOCATION (0 = LSB)

7, 6, 5

4–0

DEFAULT

000

00100

FUNCTION

Sets the crystal-divider setting.

000 = Divide by 1 (default)

001 = Divide by 2

011 = Divide by 3

100 = Divide by 4

101 through 110 = All divide values from 5 (101) to 7 (110)

111 = Divide by 8

Sets the PLL reference-divider (R) number.

00001 = Divide by 1

00010 = Divide by 2

00011 = Divide by 3

00100 = Divide by 4 (default)

00101 through 11110 = All divide values from 3 (00101) to 29

(11110)

11111 = Divide by 31

Table 6. PLL Register

BIT NAME

BIT LOCATION (0 = LSB)

D24

7

CPS

6

ICP

5

X

4–0

DEFAULT

1

VCO divider setting.

0 = Divide by 2

1 = Divide by 4 (default)

FUNCTION

Charge-pump current mode. Users must program to 0 upon

1

powering up the device.

0 = Charge-pump current controlled by ICP bit

1 = Charge-pump current controlled by VCO autoselect (VAS)

Charge-pump current.

0

0 = 600μA typical

1 = 1200μA typical

X

Don’t care.

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