Direct-Conversion TV Tuner

10

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Pin Description

PIN

NAME

FUNCTION

1

SDA

2

SCL

3

RFIN2

Second RF Input

4

RFIN

First RF Input

5

ADDR2

for “1.”

6

GND_LNA

Not Internally Connected. Connect to ground.

7

VCC_RF

DC Supply for RF LNA. Connect as close as possible a 100pF capacitor from this pin to GND.

8

LEXT

9

RF_AGC

Gain Control Input for RF VGA.

10

IND1

VHF Inductor Pin 1. Keep traces to inductor as short as possible.

11

IND2

VHF Inductor Pin 2. Keep traces to inductor as short as possible.

12

N.C.

No Connection

13

OVLD_DET

Overload Detector Output. No connection required to this pin.

14

VCC_BB

DC Supply for Baseband Filter. Connect as close as possible a 10nF capacitor from this pin to ground.

15

BBQ-

Quadrature Inverted Baseband Output

16

BBQ+

Quadrature Noninverted Baseband Output

17

BBI-

In-Phase, Inverted Baseband Output

18

BBI+

In-Phase, Noninverted Baseband Output

19

BB_AGC

Gain Control Input for Baseband VGAs

20

VCC_VCO

DC Supply for the VCO. Connect as close as possible a 100pF capacitor from this pin to ground.

21

VTUNE

VCO Tuning Voltage Input. Connect the PLL loop filter output directly to this pin.

22

GND_TUNE

Ground Reference for the Tuning Voltage. Connect to ground of the loop filter.

23

LDO

VCO LDO Output. Connect a 0.1µF capacitor to ground.

24

CP

Charge-Pump Output. Connect the charge-pump output to the PLL loop filter input.

25

GND_CP

Ground for the Charge Pump

26

VCC_SYN

DC Supply for Synthesizer and Serial-Interface Control. Connect as close as possible a 10nF

capacitor from this pin to ground.

27

GND_PLL

Ground for the PLL

28

MUX

Multiplex Output Line. Can be used as a PLL lock-detector output.

29

REF_BUFF

Buffered Output of Reference Oscillator

30

VCC_XTAL

DC Supply for Reference Oscillator. Connect as close as possible a 10nF capacitor from this pin to ground.

31

XB

Reference Input. Connect to a parallel resonant mode XTAL through a load-matching capacitor, or

can also be used as a reference clock input pin.

32

XE

Reference Oscillator Feedback. Connect to a capacitive divider when used in self-oscillating mode.

—EP

Exposed Paddle. Internally connected to ground. Solder EP to the board’s ground plane to achieve

the lowest possible impedance path and optimum RF performance.