11-189
RF2926
Rev A5 010404
11
Pin
Function
Description
Interface Schematic
16
IF1 BP-
See pin 14.
See pin 15.
17
GND7
Ground connection for 40dB IF limiting amplifier. Keep traces physically
short and connect immediately to ground plane for best performance.
18
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.
19
GND6
Ground connection for 60dB IF limiting amplifier. Keep traces physically
short and connect immediately to ground plane for best performance.
20
VREF IF
DC voltage reference for the IF limiting amplifiers. A 10nF capacitor
from this pin to ground is required.
21
IF2 IN
IF input to the 60dB limiting amplifier strip. A 10nF DC blocking capaci-
tor is required on this input. The IF2 IN input presents a nominal 330
Ω
input resistance and interfaces directly to 10.7MHz ceramic filters.
22
IF2 BP+
DC feedback node for the 60dB limiting amplifier strip. A 10nF bypass
capacitor from this pin to ground is required.
See pin 20.
23
IF2 BP-
See pin 21.
See pin 20.
24
DATA OUT
Demodulated data output from the demodulator. Output levels on this
are TTL/CMOS compatible. The magnitude of the load impedance is
intended to be 1M
Ω or greater.
25
RSSI
A DC voltage proportional to the received signal strength is output from
this pin. The output voltage range is 0.5V to 2.5V and increases with
increasing signal strength.
26
FM OUT
Linear output from the FM demodulator. This pin is used in analog
applications when signal fidelity is important.
27
DATA REF
This pin is used for setting the adaptive Data Slicer DC reference level.
A capacitor from this pin to ground can be used to set the reference
level at the average DC level of the data bit stream.The DC level deter-
mines the bit decision threshold.
28
DEMOD IN
This pin is the input to the FM demodulator. This pin is NOT AC cou-
pled. Therefore, a DC blocking capacitor is required on this pin to avoid
shorting the demodulator input with the LC tank. A ceramic discrimina-
tor or DC blocked LC tank resonant at the IF should be connected to
this pin.
29
VCC4
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 10nF capacitor is recommended for 10.7MHz IF
applications.
IF1 OUT
IF2 IN
330
330
60 k
Ω
60 k
Ω
IF2 BP+
IF2 BP-
DATA OUT
V
CC
RSSI
FM OUT
50 k
Ω
DATA REF
DEMOD IN
10 k
Ω
V
CC
IF Output
V
CC
Korean ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
