Application Circuits
Typical Application Circuit
Circuit 1
TemplateByTechPubs
FPGA / MCU
FPGA / MCU
Y1
+5V
+5V
+3.3V
+3.3V
...
...
MAX11947
MAX11947
C2
C1
RF Cable0
RF Cable0
RF Cable3
RF Cable3
LPF0
LPF0
LPF3
LPF3
Logic Supply Voltage
VL
V
L
Analog Supply Voltage
VCC
V
CC
External Crystal Input Terminal. Feed with 8.704MHz (±30ppm) input clock for external synchronization.
XTAL1
XTAL1
External Crystal Input Terminal. Connect to GND for external synchronization.
XTAL2
XTAL2
CRYSTAL OSC
CRYSTAL
OSC
/4
/4
MOD
MOD
Sync Output. Open-drain output of the 8.704MHz clock to synchronize other devices.
SYNCOUT
SYNCOUT
SPI INTERFACE
SPI
INTERFACE
Active-Low, SPI Bus Chip Enable
CSB
CSB
SPI Bus Serial Clock Input
SCLK
SCLK
MODEM INTERFACE
MODEM
INTERFACE
Modem Tx Digital Signal Input
TXIN
TXIN
Modem Rx Digital Signal Output
RXOUT
RXOUT
Direction Output. DIR is asserted high when the data stream is seen at the receiver.
DIR
DIR
GAIN CTRL
GAIN
CTRL
SENS CTRL
SENS
CTRL
DEMOD
DEMOD
MUX
MUX
RF MUX Port 0
P0
P0
RF MUX Port 1
P1
P1
RF MUX Port 2
P2
P2
RF MUX Port 3
P3
P3
BUFFER CTRL
BUFFER
CTRL
Ground
GND
GND
SPI Bus Serial Data Input
SDI
SDI
SPI Bus Serial Data Output
SDO
SDO
C5
C6
RS485 CTRL
RS485
CTRL
C7
C8
Output Bias Reference. Decouple BIAS with 1μF to GND.
BIAS
BIAS
C9
