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參數資料
| 型號： | RF2513 |
| 廠商： | RF MICRO DEVICES INC |
| 元件分類： | 通信及網絡 |
| 英文描述： | UHF TRANSMITTER |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PDSO24 |
| 封裝： | PLASTIC, SSOP-24 |
| 文件頁數： | 3/14頁 |
| 文件大?。?/td> | 321K |
| 代理商： | RF2513 |
11-25
RF2513
Rev B8 010509
11
T
Pin
1
Function
OSC B2
Description
This pin is connected directly to the reference oscillator transistor base.
The intended reference oscillator configuration is a modified Colpitts.
An appropriate capacitor as chosen by the customer should be con-
nected between pin 1 and pin 2.
Interface Schematic
2
OSC E
This pin is connected directly to the emitter of the reference oscillator
transistor. An appropriate capacitor as chosen by the customer should
be connected from this pin to ground.
This pin is connected directly to the reference oscillator transistor base.
The intended reference oscillator configuration is a modified Colpitts.
An appropriate capacitor as chosen by the customer should be con-
nected between pin 3 and pin 2.
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 electronics. A logic
low (PLL ENABL<1.0V) powers down the PLL and VCO.
See pin 1.
3
OSC B1
See pin 1.
4
PLL ENABL
5
GND1
Ground connection for the PA buffer amp. Keep traces physically short
and connect immediately to ground plane for best performance.
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.
This pin is used to vary the transmitter output power. An output level
adjustment range greater than 12dB is provided through analog volt-
age control of this pin. DC current of the transmitter power amp ia also
reduced with output power. This pin MUST be low when the transmitter
is disabled.
6
VCC3
7
LVL ADJ
8
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.
9
GND2
Ground connection for the Tx PA functions. Keep traces physically
short and connect immediately to ground plane for best performance.
This pin is used to supply DC bias to the PA buffer amp. 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.
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.
10
VCC1
11
TX ENABL
12
PRESCL
OUT
Dual-modulus/Dual-divide prescaler output. The output can be inter-
faced to an external PLL IC for additional flexibility in frequency pro-
gramming.
13
VREF P
Bias voltage reference pin for bypassing the prescaler and phase
detector. The bypass capacitor should be of appropriate size to provide
filtering of the reference crystal frequency and be connected directly to
this pin.
OSC E
OSC B1
OSC B2
50 k
PLL ENABL
400
4 k
LVL ADJ
40 k
TX OUT
20
V
CC
40 k
20 k
TX ENABL
PRESCL
OUT
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