RF2945PCBA-M Просмотр технического описания (PDF) - RF Micro Devices
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RF2945PCBA-M Datasheet PDF : 24 Pages
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RF2945
Pin Function Description
Interface Schematic
1
TX ENABL Enables the transmitter circuits. TX ENABL>2.0V powers up all trans-
mitter functions. TX ENABL<1.0V turns off all transmitter functions
except the PLL functions.
TX ENABL
20 kΩ
40 kΩ
2
TX OUT RF output pin for the transmitter electronics. TX OUT output impedance
is a low impedance when the transmitter is enabled. TX OUT is a high
impedance when the transmitter is disabled.
3
GND2
Ground connection for the 40 dB IF limiting amplifier and Tx PA func-
tions. Keep traces physically short and connect immediately to ground
plane for best performance.
4
RX IN
RF input pin for the receiver electronics. RX IN input impedance is a
low impedance when the transmitter is enabled. RX IN is a high imped-
ance when the receiver is disabled.
VCC
20
TX OUT
RX IN
500
5
GND1
Ground connection for RF receiver functions. Keep traces physically
short and connect immediately to ground plane for best performance.
6
LNA OUT Output pin for the receiver RF low noise amplifier. This pin is an open
collector output and requires an external pull up coil to provide bias and
tune the LNA output. A capacitor in series with this output can be used
to match the LNA to 50Ω impedance image filters.
7
GND3
Same as pin 3.
8
MIX IN
RF input to the RF Mixer. An LC matching network between LNA OUT
and MIX IN can be used to connect the LNA output to the RF mixer
input in applications where an image filter is not needed or desired.
VCC
MIX IN
LNA OUT
GND5
9
GND5
GND5 is the ground connection shared by the input stage of the trans-
mit power amplifier and the receiver RF mixer.
10
MIX OUT IF output from the RF mixer. Interfaces directly to 10.7MHz ceramic IF
MIX OUT
filters as shown in the application schematic. A pull-up inductor and
series matching capacitor should be used to present a 330Ω termina-
tion impedance to the ceramic filter. Alternately, an IF tank can be used
to tailor the IF frequency and bandwidth to meet the needs of a given
15 pF
15 pF
application.
GND5
GND5
11
VREF IF DC voltage reference for the IF limiting amplifiers. A 10nF capacitor .
from this pin to ground is required.
12
RSSI
A DC voltage proportional to the received signal strength is output from
this pin. The output voltage range is 0.5V to 2.3V and increases with
VCC
increasing signal strength.
RSSI
13
IF1 IN
IF input to the 40dB limiting amplifier strip. A 10nF DC blocking capaci-
tor is required on this input.
IF1 BP+
60 kΩ
IF1 BP-
60 kΩ
330
330
IF1 IN
11
Rev A10 000919
11-219
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