MAX3544CTL Просмотр технического описания (PDF) - Maxim Integrated

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MAX3544CTL

Multiband Digital Television Tuner

Maxim Integrated 

Multiband Digital Television Tuner

Pin Description

PIN

1

2

3

4

5

6

7

8

9

10, 11

12, 14,

17, 26

13, 27,

29, 39

15, 16

18

19

20

21

22

23

24

25

28

NAME

FUNCTION

RFINH High-Frequency RF Input. Matched to 75I over the operating band. Requires a DC-blocking capacitor.

RFGND1

RF Ground. Bypass to the PCB’s ground plane with a 1000pF capacitor. Keep traces as short as pos-

sible to minimize inductance to ground plane. Do not connect RFGND1 and RFGND2 together.

RFVGC

VCCIF

RFGND2

RF VGA Gain Control Voltage. Accepts a DC voltage from 0.5V to 3V.

IF Power Supply. Requires a 600I series ferrite bead to a bypass capacitor to ground.

RF Ground. Bypass to the PCB’s ground plane with a 1000pF capacitor. Keep traces as short as pos-

sible to minimize inductance to ground plane. Do not connect RFGND1 and RFGND2 together.

IFOUT1A

Dual-Mode IF Output. In single-ended mode, this pin is the IF signal output. In differential mode, this pin

is the positive terminal of the differential IF output.

IFOUT1B

Dual-Mode IF Output. In single-ended mode, this pin is the SAW filter bandwidth switch. In differential

mode, this pin is the negative terminal of the differential IF output.

IFVGC

ADDR

IF VGA Gain Control Voltage. Accepts a DC voltage from 0.5V to 3V.

2-Wire Serial-Interface Address Line. This pin sets the device address for the I2C-compatible serial

interface. There are three selectable addresses based on the state of this pin: logic-low, logic-high, or

unconnected.

IFIN-, IFIN+ Differential IF VGA Input. Connect to the IF filter output.

GND Ground. Connect pin to paddle ground to minimize trace inductance.

VCC Power-Supply Connections. Bypass each supply pin with a separate 1000pF capacitor to ground.

DTVOUT-,

DTVOUT+

Differential IF VGA Output. Connect to the demodulator input. Requires a 1000pF DC-blocking capacitor.

REFOUT

VCCDIG

SCL

Crystal Output to Drive Baseband IC. Output frequency is fXTAL or fXTAL/4.

Digital Supply. Requires a 15I series resistor to a 1FF bypass capacitor.

2-Wire Serial Clock Interface. Connect to the serial bus and ensure the bus includes an approximately

5kI pullup resistor.

XTALB

Crystal Oscillator Base. Connect to the crystal through a DC-blocking capacitor and connect a capacitor

to XTALE.

XTALE Crystal Oscillator Emitter. Connect a capacitor to ground and a capacitor to XTALB.

REFDIV

Reference Frequency Divider Control. Three modes are available depending on the state of this pin:

high = fXTAL/1, low = fXTAL/4, unconnected = state determined by register. Note: Power-up state of

register is not guaranteed; therefore, unconnected mode should only be used if the controller can

reprogram I2C in any of the divider settings.

SDA

2-Wire Serial Data Interface. Connect to serial bus and ensure the bus includes an approximately 5kI

pullup resistor.

TUNE PLL Charge-Pump Output and TUNE Input. Connect to the PLL loop filter.

LDOBYP Bypass for On-Chip VCO LDO. Bypass to ground with a 0.47FF capacitor.

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