RF2926 Просмотр технического описания (PDF) - RF Micro Devices
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RF2926 Datasheet PDF : 10 Pages
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RF2926
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
11
2
TX OUT RF output pin for the transmitter electronics. TX OUT output impedance
is a low impedance (see output impedance plot in Figure TBD) 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 (see input impedance plot in Figure TBD) when the
receiver is enabled. RX IN is a high impedance 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 GND Ground connection for the LNA.
7
LNA GND Ground connection for the LNA.
8
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.
9
GND3
Same as pin 4.
10
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
11
GND5
GND5 is the ground connection shared by the input stage of the trans-
mit power amplifier and the receiver RF mixer.
12
MIX OUT+ Complementary (with respect to pin 13) IF output from the RF mixer.
MIX OUT+
Alternately, an IF tank can be used to tailor the IF frequency and band-
width to meet the needs of a given application.
15 pF
MIX OUT-
15 pF
GND5
GND5
13
MIX OUT- IF output from the RF mixer. For a balanced mixer output, pull-up induc- See pin 12.
tors from pin 12 and 13 to VCC and a capacitor between the pins should
be used. The sum of the total pull-up inductance should be used to res-
onate the capacitor between pins 12 and 13.
14
IF1 BP+ DC feedback node for the 40dB limiting amplifier strip. A 10nF bypass See pin 16.
capacitor from this pin to ground is required.
15
IF1 IN
IF input to the 40dB limiting amplifier strip. A DC blocking capacitor is
IF1 BP+
IF1 BP-
required on this input. The value of this capacitor should be small
60 kΩ
60 kΩ
enough as to not attenuate the IF frequency when terminated into the
330Ω input impedance.
330
330
IF1 IN+
11-188
Rev A5 010404
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