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參數(shù)資料
| 型號(hào)： | RF2917 |
| 廠商： | RF MICRO DEVICES INC |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | 433/868/915MHZ FM/FSK RECEIVER |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PQFP32 |
| 封裝： | 5 X 5 MM, PLASTIC, LQFP-32 |
| 文件頁數(shù)： | 5/14頁 |
| 文件大?。?/td> | 408K |
| 代理商： | RF2917 |
11-133
RF2917
Rev B2 010118
11
T
Pin
16
Function
IF2 IN
Description
Inverting input to the 60dB limiting amplifier strip. A 10nF DC blocking
capacitor is required on this input. The IF2 IN input presents a nominal
330
input resistance and interfaces directly to 10.7MHz ceramic fil-
ters.
Interface Schematic
17
IF2 BP+
DC feedback node for the 60dB limiting amplifier strip. A 100nF bypass
capacitor from this pin to ground is required.
See pin 17.
See pin 16.
18
19
IF2 BP-
VCC3
See pin 16.
This pin is used to 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.
This pin is used to select FM, FSK, or mute at the FM OUT pin.
MUTE>Vcc - 0.4V turns the FM OUT signal off. MUTE<0.4V turns the
FM OUT signal on for FSK digital data. When MUTE is left floating, the
FM OUT signal is linear FM.
20
MUTE
21
RSSI
A DC voltage proportional to the received signal strength is output from
this pin. The output voltage increases with increasing signal strength.
22
FM OUT
Demodulated output from the discriminator/demodulator. Output levels
on this are CMOS compatible in FSK mode (see pin 20). In linear FM
mode, the demodulated signal level is approximately 240mVpp on a
DC voltage offset. The magnitude of the load impedance is intended to
be 1M
or greater.
IF output from the 60dB limiting amplifier strip. This pin is intended to
be connected to pin 24 through a 5pF capacitor (for 10.7MHz IF appli-
cations). This capacitor in conjunction with a tank resonant at the IF fre-
quency connected from pin 24 to ground is used to form an FM
discriminator.
23
IF2 OUT
24
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
a DC path to ground. A DC blocked LC tank resonant at the IF or
ceramic discriminator should be connected to this pin.
25
RESNTR-
This port is used to supply DC voltage to the VCO as well as to tune the
center frequency of the VCO. Equal value inductors should be con-
nected to this pin and pin 26.
26
27
RESNTR+
VCC2
See pin 25.
See pin 25.
This pin is used to supply DC bias to the VCO, prescaler, and PLL. 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.
GND4 is the ground shared on chip by the VCO, prescaler, and PLL
electronics.
28
GND4
IF2 IN
330
330
60 k
60 k
IF2 BP+
IF2 BP-
MUTE
V
CC
V
CC
RSSI
IF2 OUT
DEMOD IN
10 k
V
CC
RESNTR-
RESNTR+
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