Direct-Conversion Tuner IC

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5

NAME

FUNCTION

1

IOUT

Inverting I-Channel Baseband Output

PIN

Pin Description

2

IOUT

Noninverting I-Channel Baseband Output

3

Downconverter +5V Supply. Bypass with a 10pF capacitor to GND as close to the IC as possible. Connect

an additional 0.1µF capacitor in parallel with the 10pF capacitor.

4

GND

Ground. Connect to a low-inductance ground plane.

5

RF +5V Supply. Bypass with a 22pF capacitor to GND as close to the IC as possible.

6

RFIN

Inverting RF Input. Connect to a 22pF capacitor in series with a 75

Ω resistor to GND.

7

RFIN

Noninverting RF Input. Connect via matching network to a 75

Ω cable.

8, 9

GND

RF Ground. Connect to a low-inductance ground plane.

10

GC

Gain-Control Input. Apply a voltage between 1V and 4V to control the gain of the RF amplifier. Bypass with a

1000pF capacitor to minimize noise on the control line.

11

PS_SEL

Prescaler Modulus Control. Drive PS_SEL <0.5V to operate in divide-by-33 mode. Drive PS_SEL >2.4V to

operate in divide-by-32 mode.

12

Prescaler +5V Supply. Bypass with a 1000pF capacitor to GND.

13

PSOUT

Inverting Prescaler Output

14

PSOUT

Noninverting Prescaler Output

15

GND

Prescaler Ground. Connect to a low-inductance ground plane.

16

GND

Local Oscillator Ground. Connect to a low-inductance ground plane.

17, 20

N.C.

No Connection. Do not make any connection to this pin.

18

LO

Inverting LO Input

19

LO

Noninverting LO Input

21

Local Oscillator +5V Supply. Bypass with a 22pF capacitor and a 0.1µF capacitor to pin 16.

22

GND

Downconverter Ground. Connect to a low-inductance ground plane.

23

QOUT

Noninverting Q-Channel Baseband Output

24

QOUT

Inverting Q-Channel Baseband Output