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MAX3543

Multiband Analog and Digital Television Tuner

Maxim Integrated 

Multiband Analog and

Digital Television Tuner

Pin Description

PIN

NAME

FUNCTION

1

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

2

RFGND1

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

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

3

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

4

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

5

RFGND2

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

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

6

IFOUT1A

Dual-Mode DTV 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.

7

IFOUT1B

Dual-Mode DTV 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.

8

IFVGC 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

9

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

unconnected.

10, 11 IFIN-, IFIN+ Differential IF VGA Input. Connect to the IF filter output.

12, 17, 26 GND Ground. Connect pin to paddle ground to minimize trace inductance.

13, 27,

29, 39

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

14

IFOUT2

Single-Ended IF Output. Connect to the analog demodulator input. Requires a 1000pF DC-blocking

capacitor.

15, 16

DTVOUT-,

DTVOUT+

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

18

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

19

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

20

SCL

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

5kI pullup resistor.

21

XTALB

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

to XTALE.

22

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

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

23

REFDIV

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.

24

SDA

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

pullup resistor.

25

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

28

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

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