MAX2112 Просмотр технического описания (PDF) - Maxim Integrated

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MAX2112

Complete, Direct-Conversion Tuner for DVB-S2 Applications

Maxim Integrated 

MAX2112

Complete, Direct-Conversion

Tuner for DVB-S2 Applications

PIN

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

8

Pin Description

NAME

VCC_RF2

VCC_RF1

GND

RFIN

GC1

VCC_LO

VCC_VCO

VCOBYP

VTUNE

GNDTUNE

GNDSYN

CPOUT

VCC_SYN

XTAL

FUNCTION

DC Power Supply for LNA. Connect to a +3.3V low-noise supply. Bypass to GND with a 1nF capacitor

connected as close as possible to the pin. Do not share capacitor ground vias with other ground connections.

DC Power Supply for LNA. Connect to a +3.3V low-noise supply. Bypass to GND with a 1nF capacitor

connected as close as possible to the pin. Do not share capacitor ground vias with other ground connections.

Ground. Connect to board’s ground plane for proper operation.

Wideband 75Ω RF Input. Connect to an RF source through a DC-blocking capacitor.

RF Gain-Control Input. High-impedance analog input with a 0.5V to 2.7V operating range.

VGC1 = 0.5V corresponds to the maximum gain setting.

DC Power Supply for LO Generation Circuits. Connect to a +3.3V low-noise supply. Bypass to GND with

a 1nF capacitor connected as close as possible to the pin. Do not share capacitor ground vias with

other ground connections.

DC Power Supply for VCO Circuits. Connect to a +3.3V low-noise supply. Bypass to GND with a 1nF

capacitor connected as close as possible to the pin. Do not share capacitor ground vias with other

ground connections.

Internal VCO Bias Bypass. Bypass to GND with a 100nF capacitor connected as close as possible to

the pin. Do not share capacitor ground vias with other ground connections.

High-Impedance VCO Tune Input. Connect the PLL loop filter output directly to this pin with as short of a

connection as possible.

Ground for VTUNE. Connect to the PCB ground plane.

Ground for Synthesizer. Connect to the PCB ground plane.

Charge-Pump Output. Connect this output to the PLL loop filter input with the shortest connection

p o ss i b l e .

DC Power Supply for Synthesizer Circuits. Connect to a +3.3V low-noise supply. Bypass to GND with a

1nF capacitor connected as close as possible to the pin. Do not share capacitor ground vias with other

ground connections.

Crystal-Oscillator Interface. Use with an external parallel-resonance-mode crystal through a series 1nF

capacitor. See the Typical Application Circuit.

REFOUT Crystal-Oscillator Buffer Output. A DC-blocking capacitor must be used when driving external circuitry.

VCC_DIG

QOUT+

QOUT-

IOUT+

IOUT-

IDC+

IDC-

QDC+

QDC-

VCC_BB

DC Power Supply for Digital Logic Circuits. Connect to a +3.3V low-noise supply. Bypass to GND with a

1nF capacitor connected as close as possible to the pin. Do not share capacitor ground vias with other

ground connections.

Quadrature Baseband Differential Output. AC-couple with 47nF capacitors to the demodulator input.

In-Phase Baseband Differential Output. AC-couple with 47nF capacitors to the demodulator input.

I-Channel Baseband DC Offset Correction. Connect a 47nF ceramic chip capacitor from IDC- to IDC+.

Q-Channel Baseband DC Offset Correction. Connect a 47nF ceramic chip capacitor from QDC- to QDC+.

DC Power Supply for Baseband Circuits. Connect to a +3.3V low-noise supply. Bypass to GND with

a 1nF capacitor connected as close as possible to the pin. Do not share capacitor ground vias with

other ground connections.

Maxim Integrated

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