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Satellite IF Switch
Detailed Description
The MAX12005 satellite IF switch features eight 75 I
inputs with three selectable gain steps of 0, +6dB, and
+12dB. Each of the eight input amplifiers feeds into four
nine-to-one multiplexers with the switching controlled
by voltage/tone or DiSEqC signaling from up to four
receivers. The output of each multiplexer is then sent to
a satellite receiver through a 75 I buffered output stage.
The satellite IF switch has four modes of operation. Two
modes are used to increase the number of IF inputs by
cascading two MAX12005 ICs together. The first IC is
set to master mode to enable the four cascade inputs.
The second IC is set to slave mode with its outputs
connected to the cascade inputs of the master IC.
The LNB mode sets up the IC to recognize LNB DiSEqC
signaling to control switching and ignore DiSEqC
signaling for multiswitch applications. The single mode
sets up the IC to recognize multiswitch DiSEqC signaling
to control switching and ignore LNB DiSEqC signaling.
For the LNB, single, and slave modes, the four cascade
inputs are disabled.
Input Gain Select
The voltage supplied to the GAIN_SELECT pin provides
the selection for one of three gain settings available at all
eight input stages, as follows:
GND = 0dB
1/2 V CC = +6dB
V CC = +12dB
The +6dB gain step voltage can be set through the
use of a simple supply voltage-divider. This gain select
feature is intended to compensate for input signal losses
due to the use of input RF signal splitters.
Chip Mode Select
The voltage supplied to the MODE_SELECT pin provides
the selection for one of four IC operational modes, as
follows:
GND = LNB Mode
1/3 V CC = Slave Mode (Cascade Operation)
2/3 V CC = Master Mode (Cascade Operation)
V CC = Single Mode
The slave mode and master mode voltages can be set
through the use of simple supply voltage-dividers.
Switch Control
Voltage/tone signaling is the default switch control after
power-up or when a receiver is connected or recon-
nected with the die power on. After an individual decoder
receives a DiSEqC signal, that decoder switches from
voltage/one control to DiSEqC control until a new receiver
connection is made or when the IC has a power-on reset.
Layout Considerations
To minimize coupling between different sections of the
IC, a star power-supply routing configuration with a large
decoupling capacitor at a central V CC node is recom-
mended. The V CC traces branch out from this node,
each going to a separate V CC node in the circuit. Place
a bypass capacitor as close as possible to each sup-
ply pin. This arrangement provides local decoupling at
each V CC pin. Use at least one via per bypass capacitor
for a low-inductance ground connection. Do not share
the capacitor ground vias with any other branch. The
MAX12005 EV kit can be used as a starting point for
layout. For best performance, take into consideration
grounding and routing of RF, baseband, and power-
supply PCB proper line. Make connections from vias
to the ground plane as short as possible. On the high-
impedance ports, keep traces short to minimize shunt
capacitance. EV kit schematic and Gerber files can be
found at www.maxim-ic.com .
SPI is a trademark of Motorola, Inc.
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