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參數(shù)資料
| 型號(hào)： | RF2926 |
| 廠商： | RF MICRO DEVICES INC |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | UHF DUAL CONVERSION TRANSCEIVER |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PQFP48 |
| 封裝： | PLASTIC, LQFP-48 |
| 文件頁(yè)數(shù)： | 5/10頁(yè) |
| 文件大小： | 327K |
| 代理商： | RF2926 |
11-189
RF2926
Rev A5 010404
11
T
Pin
16
17
Function
IF1 BP-
GND7
Description
See pin 14.
Interface Schematic
See pin 15.
Ground connection for 40dB IF limiting amplifier. Keep traces physically
short and connect immediately to ground plane for best performance.
IF output from the 40dB limiting amplifier. The IF1 OUT output presents
a nominal 330
output resistance and interfaces directly to 10.7MHz
ceramic filters.
18
IF1 OUT
19
GND6
Ground connection for 60dB IF limiting amplifier. Keep traces physically
short and connect immediately to ground plane for best performance.
DC voltage reference for the IF limiting amplifiers. A 10nF capacitor
from this pin to ground is required.
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
input resistance and interfaces directly to 10.7MHz ceramic filters.
20
VREF IF
21
IF2 IN
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 21.
See pin 20.
23
24
IF2 BP-
DATA OUT
See pin 20.
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
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
60 k
IF2 BP+
IF2 BP-
DATA OUT
V
CC
RSSI
FM OUT
50 k
DATA REF
DEMOD IN
10 k
V
CC
IF Output
V
CC
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