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參數(shù)資料
| 型號： | RF2945 |
| 廠商： | RF MICRO DEVICES INC |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | 433/868/915MHZ FSK/ASK/OOK TRANSCEIVER |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PQFP32 |
| 封裝： | 5 X 5 MM, PLASTIC, LQFP-32 |
| 文件頁數(shù)： | 5/24頁 |
| 文件大?。?/td> | 742K |
| 代理商： | RF2945 |
11-219
RF2945
Rev A10 000919
11
T
Pin
1
Function
TX ENABL
Description
Enables the transmitter circuits. TX ENABL>2.0V powers up all trans-
mitter functions. TX ENABL<1.0V turns off all transmitter functions
except the PLL functions.
Interface Schematic
2
TX OUT
RF output pin for the transmitter electronics. TX OUT output impedance
is a low impedance when the transmitter is enabled. TX OUT is a high
impedance when the transmitter is disabled.
3
GND2
Ground connection for the 40 dB IF limiting amplifier and Tx PA func-
tions. Keep traces physically short and connect immediately to ground
plane for best performance.
RF input pin for the receiver electronics. RX IN input impedance is a
low impedance when the transmitter is enabled. RX IN is a high imped-
ance when the receiver is disabled.
4
RX IN
5
GND1
Ground connection for RF receiver functions. Keep traces physically
short and connect immediately to ground plane for best performance.
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
impedance image filters.
Same as pin 3.
6
LNA OUT
7
8
GND3
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.
9
GND5
GND5 is the ground connection shared by the input stage of the trans-
mit power amplifier and the receiver RF mixer.
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
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.
DC voltage reference for the IF limiting amplifiers. A 10nF capacitor
from this pin to ground is required.
A DC voltage proportional to the received signal strength is output from
this pin. The output voltage range is 0.5V to 2.3V and increases with
increasing signal strength.
10
MIX OUT
11
VREF IF
.
12
RSSI
13
IF1 IN
IF input to the 40dB limiting amplifier strip. A 10nF DC blocking capaci-
tor is required on this input.
40 k
20 k
TX ENABL
TX OUT
20
V
CC
RX IN
500
LNA OUT
V
CC
GND5
MIX IN
MIX OUT
15 pF
15 pF
GND5
GND5
V
CC
RSSI
IF1 IN
330
330
60 k
60 k
IF1 BP+
IF1 BP-
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