11-188
RF2926
Rev A5 010404
11
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.
2TX 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.
4RX 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.
5
GND1
Ground connection for RF receiver functions. Keep traces physically
short and connect immediately to ground plane for best performance.
6LNA GND
Ground connection for the LNA.
7LNA GND
Ground connection for the LNA.
8LNA 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 50
Ω 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.
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.
Alternately, an IF tank can be used to tailor the IF frequency and band-
width to meet the needs of a given application.
13
MIX OUT-
IF output from the RF mixer. For a balanced mixer output, pull-up induc-
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.
See pin 12.
14
IF1 BP+
DC feedback node for the 40dB limiting amplifier strip. A 10nF bypass
capacitor from this pin to ground is required.
See pin 16.
15
IF1 IN
IF input to the 40dB limiting amplifier strip. A DC blocking capacitor is
required on this input. The value of this capacitor should be small
enough as to not attenuate the IF frequency when terminated into the
330
Ω input impedance.
40 k
Ω
20 k
Ω
TX ENABL
TX OUT
20
V
CC
RX IN
500
LNA OUT
V
CC
GND5
MIX IN
MIX OUT-
MIX OUT+
15 pF
15 pF
GND5
GND5
IF1 IN+
330
330
60 k
Ω
60 k
Ω
IF1 BP+
IF1 BP-
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