Rainbow Electronics MAX3580 - Manual (Page 10)

MAX3580
Direct-Conversion TV Tuner
10 ______________________________________________________________________________________
Pin Description
PIN NAME FUNCTION
1 SDA Serial-Data Input Line. Requires a pullup resistor to V
CC
.
2 SCL Serial-Clock Input. Requires a pullup resistor to V CC .
3 RFIN2 Second RF Input
4 RFIN First RF Input
5 ADDR2
Address Line. Sets the 3rd LSB of the device address. Connect to ground to set for “0” or V CC to set
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 External Bias Inductor. Connect to V
CC
with a 270nH inductor.
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. Connect a 10k Ω pullup resistor to V
CC and a RC network to RF_AGC.
14 VCC_BB D C S up p l y for Baseb and Fi l ter . C onnect as cl ose as p ossi b l e a 10nF cap aci tor fr om thi s p i n to g r ound .
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 D C S up p l y for Refer ence Osci l l ator . C onnect as cl ose as p ossi b l e a 10nF cap aci tor fr om thi s p i n to g r ound .
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 EP Exposed Paddle. Solder to the board’s ground plane to achieve the lowest possible impedance path.