11-147
RF2919
Rev A12 001113
11
Pin
Function
Description
Interface Schematic
16
IF2 IN
Inverting input to the 60dB limiting amplifier strip. A 10 nF DC blocking
capacitor is required on this input. The IF2 IN input presents a nominal
330
Ω input resistance and interfaces directly to 10.7MHz ceramic fil-
ters.
17
IF2 BP+
DC feedback node for the 60dB limiting amplifier strip. A 10nF bypass
capacitor from this pin to ground is required.
See pin 16.
18
IF2 BP-
See pin 17.
See pin 16.
19
VCC3
This pin is used is supply DC bias to the 60dB IF limiting amplifier. An
IF bypass capacitor should be connected directly to this pin and
returned to ground. A 10 nF capacitor is recommended for 10.7MHz IF
applications.
20
MUTE
This pin is used to mute the data output (DATA OUT). MUTE> 2.0V
turns the DATA OUT signal on. MUTE<1.0V turns the DATA OUT signal
off.
21
RSSI
A DC voltage proportional to the received signal strength is output from
this pin. The output voltage increases with increasing signal strength.
22
DATA IN-
The inverting input of the data comparator. The RSSI is fed to this pin
via a 50k
Ω resistor. This input is available for a data filtering capacitor
that provides noise and 2x IF rejection. The value of the capacitor can
be calculated by C= 1/(2
πF*50kΩ) where F is the desired 3dB band-
width.
23
DATA OUT
The data comparator output which contains the modulating data recov-
ered from the RSSI signal. Hysteresis can be added to the comparator
by placing a very large (< 1M
Ω) resistor between pins 23 and 24.The
magnitude of the load impedance is intended to be 1M
Ω or greater.
24
DATA IN+
The non-inverting input of the data comparator. The RSSI is fed to this
pin via a 50k
Ω resistor. This input is available for a large filtering capac-
itor such that the modulation signal can be filtered out leaving a DC ref-
erence signal for the comparator.
See pin 22.
25
RESNTR-
This port is used to supply DC voltage to the VCO as well as to tune the
center frequency of the VCO. Equal value inductors should be con-
nected to this pin and pin 26.
26
RESNTR+
See pin 25.
See pin 25.
27
VCC2
This pin is used is supply DC bias to the VCO, prescaler, and PLL. An
IF bypass capacitor should be connected directly to this pin and
returned to ground. A 10nF capacitor is recommended for 10.7MHz IF
applications.
28
GND4
GND4 is the ground shared on chip by the VCO, prescaler, and PLL
electronics.
IF2 IN
330
Ω
60 k
Ω
60 k
Ω
IF2 BP-
IF2 BP+
MUTE
75 k
Ω
25 k
Ω
V
CC
RSSI
50 k
Ω
50 k
Ω
DATA IN+
DATA IN-
RSSI
DATA OUT
RESNTR-
RESNTR+
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