Rainbow Electronics MAX3540 - Manual (Page 5)

MAX3540
Pin Description
PIN NAME FUNCTION
1 SCL 2-Wire Serial-Clock Interface. Requires a pullup resistor to V CC .
2 SDA 2-Wire Serial-Data Interface. Requires a pullup resistor to V CC .
3, 10, 23,
28, 32, 33,
37, 41, 44
V CC Power-Supply Connections. Bypass each supply pin to ground with a 1000pF capacitor.
4 UHF_IN UHF RF Input. Matched to 75 Ω over the operating band. Requires a DC-blocking capacitor.
5 VHF_IN VHF RF Input. Matched to 75 Ω over the operating band. Requires a DC-blocking capacitor.
6 RFGND2
RF Ground. Bypass to the PCB’s ground plane with a 1000pF capacitor. Do not connect RFGND2
and RFGND3 together.
7 LEXT RF VGA Supply Voltage. Connect through a 270nH pullup inductor to V CC .
8 RFGND3
RF Ground. Bypass to the PCB’s ground plane with a 1000pF capacitor. Do not connect RFGND2
and RFGND3 together.
9 RFAGC RF AG C G ai n- C ontr ol V ol tag e. Accep ts a D C vol tag e fr om 0.5V ( m i ni m um g ai n) to 3V ( m axi m um g ai n) .
11–22,
27, 31
GND Ground. Connect to the PCB’s ground plane.
24 IFOUT2- Inver ti ng IF- V G A Outp ut. C onnect to the i np ut of an anti - al i asi ng fi l ter . Req ui r es a D C - b l ocki ng cap aci tor .
25 IFOUT2+
Noninverting IF-VGA Output. Connect to the input of an anti-aliasing filter. Requires a DC-blocking
capacitor.
26 IFAGC IF AGC Gain-Control Voltage. Accepts a DC voltage from 0.5V (minimum gain) to 3V (maximum gain).
29 IFIN- Inverting IF-VGA Input. Connect to the output of an IF-SAW filter.
30 IFIN+ Noninverting IF-VGA Input. Connect to the output of an IF-SAW filter.
34 IFOVLD IF Power Detector Open-Collector Output. Requires a 10k Ω pullup resistor to V
CC
.
35 IFOUT1+ N oni nver ti ng IF- LN A Outp ut. Req ui r es a D C - b l ocki ng cap aci tor .
36 IFOUT1- Inverting IF-LNA Output. Requires a DC-blocking capacitor.
38 LDO VCO LDO Bypass. Bypass to ground with a 0.47μF capacitor.
39 GND_TUNE
VTUNE Ground Connection. Connect to the PCB ground plane. All loop filter component GND must
be connected to this pin (see the Typical Application Circuit).
40 VTUNE VCO Tuning Input. Connect to the PLL loop filter output.
42 MUX Test Output. Leave this pin unconnected during normal operation.
43 CP Charge-Pump Output. Connect to the PLL loop filter input.
45 XTALN Crystal Oscillator Feedback. See the Typical Application Circuit.
46 XTALP Crystal Input. Requires a DC-blocking capacitor.
47 ADDR1
2-Wire Serial-Interface Address Line 1. This pin along with ADDR2 sets the device address for the
I
2 C-compatible serial interface.
48 ADDR2
2-Wire Serial-Interface Address Line 2. This pin along with ADDR1 sets the device address for the
I
2 C-compatible serial interface.
EP EP Exposed Paddle. Solder evenly to the PCB ground plane for proper operation.
Complete Single-Conversion Television Tuner
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