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參數(shù)資料
| 型號(hào)： | RF2908 |
| 廠商： | RF MICRO DEVICES INC |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | 915MHZ SPREAD SPECTRUM RECEIVER WITH PLL FREQUENCY SYNTHESIZER |
| 中文描述： | TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, PQFP48 |
| 封裝： | PLASTIC, LQFP-48 |
| 文件頁數(shù)： | 6/18頁 |
| 文件大?。?/td> | 534K |
| 代理商： | RF2908 |
11-90
RF2908
Rev C1 010904
11
T
Pin
35
Function
PLL ENABL
Description
This pin is used to power up or down the VCO and PLL. A logic high
(PLL ENABL>2.0V) powers up the VCO and PLL circuitry. A logic low
(PLL ENABL<1.0V) powers down the PLL and VCO.
Enable pin for the receiver circuits. RX ENABL>2.0V powers up all
receiver functions. RX ENABL<1.0V turns off all receiver functions
except the PLL functions and the RF mixer.
Bandwidth select logic input. Pin 37 and pin 38 provide a two bit control
word for the setting of the IF bandwidth. See Table1.
Bandwidth select logic input. Pin 37 and pin 38 provide a two bit control
word for the setting of the IF bandwidth. See Table1.
Logic-level data output for the quadrature channel. This is a digital out-
put signal obtained from the output of a Schmitt trigger.
Received signal strength indicator for the quadrature channel.
Interface Schematic
36
RX ENABL
37
BW SEL2
38
BW SEL1
39
Q DATA
40
41
42
43
44
RSSI Q
VREF
IF OUT Q
VGC
VCC1
Gain control reference voltage.
Analog signal IF output for quadrature channel.
Gain control voltage.
Power supply for bias circuits and VGA amplifiers for both the in-phase
and quadrature channels.
DC feedback capacitor for quadrature channel.
45
46
47
48
DCFB Q
GND1
IN Q-
IN Q+
Ground for VCC1 for both the in-phase and quadrature channels.
Minus input for quadrature channel
Plus input for quadrature channel
Table 1: Bandw idth Selec tion Controls
BWSEL1
BWSEL2
IF
-3dB
Frequency
1MHz
2MHz
4MHz
8MHz
0
0
1
1
0
1
0
1
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