RF2905 Просмотр технического описания (PDF) - RF Micro Devices
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RF2905 Datasheet PDF : 22 Pages
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RF2905
Pin Function Description
Interface Schematic
13
IF1 IN+ Balanced IF input to the 40dB limiting amplifier strip. A 10nF DC block-
IF1 BP+
IF1 BP-
ing capacitor is required on this input.
60 kΩ
60 kΩ
330
IF1 IN+
330
IF1 IN-
14
IF1 IN-
Functionally the same as pin 13 except inverting node amplifier input. See pin 13.
In single-ended applications, this input should be bypassed directly to
ground through a 10nF capacitor.
15
IF1 BP+ DC feedback node for the 40dB limiting amplifier strip. A 10nF bypass See pin 13.
capacitor from this pin to ground is required.
16
IF1 BP- Same as pin 15.
See pin 13.
17
IF1 OUT IF output from the 40dB limiting amplifier. The IF1 OUT output presents
a nominal 330Ω output resistance and interfaces directly to 10.7MHz
ceramic filters.
IF1 OUT
18
IF2 IN
Balanced IF input to the 60dB limiting amplifier strip. A 10nF DC block-
ing capacitor is required on this input. The IF2 IN input presents a nom-
inal 330Ω input resistance and interfaces directly to 10.7MHz ceramic
filters.
IF2 BP+
60 kΩ
330
IF2 BP-
60 kΩ
330
IF2 IN
11
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 BP+ DC feedback node for the 60dB limiting amplifier strip. A 10nF bypass See pin 18.
capacitor from this pin to ground is required.
22
IF2 BP- Same as pin 21.
See pin 18.
23
MUTE
This pin is used to mute the data output (DATA OUT). MUTE>2.0V
75 kΩ
turns the DATA OUT signal on. MUTE<1.0V turns the DATA OUT sig-
MUTE
nal off. The MUTE signal should be logic low in the Sleep Mode.
25 kΩ
24
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, into 51k Ω load, and
increases with increasing signal strength.
25
FM OUT Linear output from the FM demodulator. This pin is used in analog
applications when signal fidelity is important. This output is inverted for
low side injection of the LO and normal for high side injection.
VCC
RSSI
FM OUT
26 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 1MΩ or greater. When using a RF2905 transmitter and
receiver back to back a data inversion will occur, when the LO is low
side injected. A high side injection will add an inversion of the Rx data.
11-58
DATA OUT
Rev B11 010516
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