RF2926 Просмотр технического описания (PDF) - RF Micro Devices
Номер в каталоге
Компоненты Описание
производитель
RF2926 Datasheet PDF : 10 Pages
| |||
RF2926
Pin Function Description
Interface Schematic
30
RESNTR+
This port is used to supply DC voltage to the VCO as well as to tune the
RESNTR+
center frequency of the VCO. Equal value inductors should be con-
nected to this pin and pin 31 although a small imbalance can be used
to tune in the proper frequency range.
RESNTR-
4 kΩ
MOD IN
31
RESNTR- See RESNTR+ description.
See pin 30.
32
VCC2
This pin is used is supply DC bias to the VCO and buffer amps. A 10nF
capacitor is recommended for 10.7MHz IF applications.
33
GND4
GND4 is the ground shared on chip by the VCO, prescaler, and PLL
electronics.
34
MOD IN FM analog or digital modulation can be imparted to the VCO through See pin 30.
this pin. The VCO varies in accordance to the voltage level presented
to this pin. To set the deviation to a desired level, a voltage divider refer-
enced to VCC is the recommended. This deviation is also dependent
upon the overall capacitance of the external resonant circuit.
35
VCO OUT This pin is used is supply a buffered VCO output to go to the PLL chip.
This pin has a DC bias and needs to be AC coupled.
VCO OUT
36
LO-
Balanced input for the first LO. This signal is presented to both the
receiver second downconverter and transmit upconvertor.
LO-
LO+
11
37
LO+
Complementary input of LO-.
See pin 36.
38
GND8
Ground for LO amp and transmit upconvertor. Keep traces physically
short and immediately to the ground plane for best performance.
39
UP CONV The output of the transmit signal upconvertor. This signal should be fil-
tered to remove the undesired sideband and spurs before being applied
to the PA input, pin 45.
40
GND9
Same as pin 38.
See pin 38.
41
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 100pF capacitor is recommended for 915MHz applica-
tions. A 220pF capacitor is recommended for 433MHz applications.
42
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 signal
MUTE
off. The MUTE signal should be logic low in the Sleep Mode.
25 kΩ
43
MIX CA Mixer Current Adjust. This pin is used to adjust the current in the
receiver. A resistor connected to ground controls the bias current in the
mixer. The resistor should vary between 1kΩ to open circuit to vary the
current from 18mA to 10.6mA
44
PA INP
Input of the transmit power amplifier.
45
VCC3
This pin is used to supply DC bias to the transmitter PA. A RF bypass
capacitor should be connected directly to this pin and returned to
ground. A 100pF capacitor is recommended for 915MHz applications.
A 220pF capacitor is recommended for 433MHz applications.
11-190
Rev A5 010404
Share Link: 