MAX2120CTI+ Datasheet MAX2120CTI+, MAX2120CTI+T | P10-P12

MAX2120

Complete, Direct-Conversion Tuner for DVB-S

and Free-to-Air Applications

10 ______________________________________________________________________________________

MSB LSB

DATA BYTE

REG

NAME

READ/

WRITE

REG

ADDRESS

D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0]

N-Divider

MSB

Write 0x00 X N[14] N[13] N[12] N[11] N[10] N[9] N[8]

N-Divider

LSB

Write 0x01 N[7] N[6] N[5] N[4] N[3] N[2] N[1] N[0]

Charge

Pump

Write 0x02

CPMP[1]

CPMP[0]

CPLIN[1]

CPLIN[0]

XXXX

4 Not Used Write 0x03 X X X X X X X X

5 Not Used Write 0x04 X X X X X X X X

XTAL

Divider/

R-Divider

Write 0x05 XD[2] XD[1] XD[0] R[4] R[3] R[2] R[1] R[0]

7 PLL Write 0x06 D24 CPS ICP X X X X X

8 VCO Write 0x07 VCO[4] VCO[3] VCO[2] VCO[1] VCO[0] VAS ADL ADE

9 LPF Write 0x08 LPF[7] LPF[6] LPF[5] LPF[4] LPF[3] LPF[2] LPF[1] LPF[0]

10 Control Write 0x09 STBY X

PWDN

X BBG[3] BBG[2] BBG[1] BBG[0]

11 Shutdown Write 0x0A X

PLL

DIV

VCO

RFMIX

RFVGA

12 Test Write 0x0B

CPTST[2]

CPTST[1]

CPTST[0]

TURBO

MUX[2]

MUX[1]

MUX[0]

Status

Byte-1

Read 0x0C POR VASA VASE LD X X X X

Status

Byte-2

Read 0x0D VCOSBR[4] VCOSBR[3] VCOSBR[2] VCOSBR[1] VCOSBR[0] ADC[2] ADC[1] ADC[0]

Table 1. Register Configuration

0 = Set to “0” for factory-tested operation.

1 = Set to “1” for factory-tested operation.

X = Don’t care.

BIT NAME BIT LOCATION (0 = LSB) DEFAULT FUNCTION

X 7 X Don’t care.

N[14:8] 6–0 0000011

Sets the most significant bits of the PLL integer-divide number (N).

Default value is N = 950 decimal. N can range from 16 to 2175.

Table 2. N-Divider MSB Register

Table 3. N-Divider LSB Register

Detailed Description

The MAX2120 includes 12 user-programmable registers

and 2 read-only registers. See Table 1 for register con-

figurations. The register configuration of Table 1 shows

each bit name and the bit usage information for all regis-

ters. Note that all registers must be written after and no

earlier than 100µs after the device is powered up.

BIT NAME BIT LOCATION (0 = LSB) DEFAULT FUNCTION

N[7:0] 7–0 10110110

Sets the least significant bits of the PLL integer-divide number (N).

Default value is N = 950 decimal. N can range from 16 to 2175.

MAX2120

Complete, Direct-Conversion Tuner for DVB-S

and Free-to-Air Applications

______________________________________________________________________________________ 11

BIT NAME BIT LOCATION (0 = LSB) DEFAULT FUNCTION

CPMP[1:0] 7, 6 00

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

upon powering up the device.

CPLIN[1:0] 5, 4 00

Controls charge-pump linearity.

00 = Typically balanced charge and sink currents.

Other values are not tested.

X 3–0 X Don’t care.

Table 4. Charge-Pump Register

BIT NAME BIT LOCATION (0 = LSB) DEFAULT FUNCTION

XD[2:0] 7, 6, 5 000

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

R[4:0] 4–0 00100

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 5. XTAL Buffer and Reference Divider Register

BIT NAME BIT LOCATION (0 = LSB) DEFAULT FUNCTION

D24 7 1

VCO divider setting.

0 = Divide by 2. Use for LO frequencies ≥ 1125MHz.

1 = Divide by 4. Use for LO frequencies < 1125MHz.

CPS 6 1

Charge-pump current mode.

0 = Charge-pump current controlled by ICP bit

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

ICP 5 0

Charge-pump current.

0 = 600µA typical

1 = 1200µA typical

X 4–0 X Don’t care.

Table 6. PLL Register

MAX2120

Complete, Direct-Conversion Tuner for DVB-S

and Free-to-Air Applications

12 ______________________________________________________________________________________

BIT NAME BIT LOCATION (0 = LSB) DEFAULT FUNCTION

VCO[4:0] 7–3 11001

Controls which VCO is activated when using manual VCO

programming mode. This also serves as the starting point for

the VCO autoselect mode.

VAS 2 1

VCO Autoselection (VAS) Circuit

0 = Disable VCO selection must be program through I

1 = Enable VCO selection controlled by autoselection circuit

ADL 1 0

Enables or disables the VCO tuning voltage ADC latch when

the VCO autoselect mode (VAS) is disabled.

0 = Disables the ADC latch

1 = Latches the ADC value

ADE 0 0

Enables or disables VCO tuning voltage ADC read when the

VCO autoselect mode (VAS) is disabled.

0 = Disables ADC read

1 = Enables ADC read

Table 7. VCO Register

BIT NAME BIT LOCATION (0 = LSB) DEFAULT FUNCTION

LPF[7:0] 7–0 01001011

Sets the baseband lowpass filter 3dB corner frequency. 3dB

corner frequency = 4MHz + (LPF[7:0] - 12) x 290kHz.

Table 8. Lowpass Filter Register

BIT NAME BIT LOCATION (0 = LSB) DEFAULT FUNCTION

STBY 7 0

Software standby control.

0 = Normal operation

1 = Disables the signal path and frequency synthesizer, leaving

only the 2-wire bus, crystal oscillator, XTALOUT buffer, and

XTALOUT buffer divider active

X 6 X Don’t care.

PWDN 5 0

Factory use only.

0 = Normal operation; other value is not tested.

X 4 X Don’t care.

BBG[3:0] 3–0 0000

Baseband gain setting (1dB typical per step).

0000 = Minimum gain (0dB)

…

1111 = Maximum gain (15dB typical)

Table 9. Control Register

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P21

MAX2120CTI+

Mfr. #:

Buy MAX2120CTI+

Manufacturer:

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Description:

Tuners Direct Conversion Tu Ner For Dvb-S -75 To

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MAX2120CTI+

MAX2120CTI+

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