11-132
RF2917
Rev B2 010118
11
Pin
Function
Description
Interface Schematic
1
VCC1
This pin is used to supply DC bias to the receiver RF electronics. A RF
bypass capacitor should be connected directly to this pin and returned
to ground. A 22pF capacitor is recommended for 915MHz applications.
A 100pF capacitor is recommended for 433MHz applications.
2RX IN
RF input pin for the receiver electronics. RX IN input impedance is a
low impedance when enabled. RX IN is a high impedance when the
receiver is disabled.
3
GND1
Ground connection for RF receiver functions. Keep traces physically
short and connect immediately to ground plane for best performance.
4LNA 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.
5
GND2
GND2 is connection for the 40 dB IF limiting amplifier. Keep traces
physically short and connect immediately to ground plane for best per-
formance.
6
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.
7
GND3
GND3 is the ground connection for the receiver RF mixer.
8MIX OUT
IF output from the RF mixer. Interfaces directly to 10.7MHz ceramic IF
filters as shown in the application schematic. A pull-up inductor and
series matching capacitor should be used to present a 330
Ω 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
application. In addition to the matching components, a 15pF capacitor
should be placed from this pin to ground.
9IF1 IN-
Balanced IF input to the 40dB limiting amplifier strip. A 10nF DC block-
ing capacitor is required on this input.
10
IF1 IN+
Functionally the same as pin 9 except non-inverting node amplifier
input. In single-ended applications, this input should be bypassed
directly to ground through a 10 nF capacitor.
See pin 9.
11
IF1 BP+
DC feedback node for the 40dB limiting amplifier strip. A 100nF bypass
capacitor from this pin to ground is required.
See pin 9.
12
IF2 BP-
See pin 11.
See pin 9.
13
IF1 OUT
IF output from the 40dB limiting amplifier. The IF1 OUT output presents
a nominal 330
Ω output resistance and interfaces directly to 10.7MHz
ceramic filters.
14
VREF IF
DC voltage reference for the IF limiting amplifiers (typically 1.1V). A
0.1
µF capacitor from this pin to ground is required.
15
GND5
Ground connection for 60dB IF limiting amplifier. Keep traces physically
short and connect immediately to ground plane for best performance.
RX IN
LNA OUT
MIX IN
MIX OUT+
V
CC
IF1 IN-
IF1 IN+
330
330
60 k
Ω
60 k
Ω
IF1 BP+
IF1 BP-
IF1 OUT
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