Rainbow Electronics MAX2108 - Manual (Page 5)

MAX2108
Direct-Conversion Tuner IC
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NAME FUNCTION
1 IOUT Inverting I-Channel Baseband Output
PIN
Pin Description
2 IOUT Noninverting I-Channel Baseband Output
3 V CC
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 V CC 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 V CC 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 V CC 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