MAX2117 데이터 시트보기 (PDF) - Maxim Integrated

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MAX2117

Complete, Direct-Conversion Tuner for MMDS Applications

Maxim Integrated 

Complete, Direct-Conversion Tuner for

MMDS 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]

BIT LOCATION (0 = LSB)

7, 6, 5

DEFAULT

000

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

R[4:0]

4–0

00100

00011 = Divide by 3

00100 = Divide by 4 (default)

…

11111 = Divide by 31

Table 6. PLL Register

BIT NAME

BIT LOCATION (0 = LSB)

D48

7

CPS

6

ICP

5

X

4–0

DEFAULT

1

1

0

X

FUNCTION

VCO divider setting.

0 = Divide by 4. Use for LO frequencies ≥ 563MHz.

1 = Divide by 8. Use for LO frequencies < 563MHz.

Charge-pump current mode.

0 = Charge-pump current controlled by ICP bit

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

Charge-pump current.

0 = 600µA typical

1 = 1200µA typical

Don’t care.

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