RF2512 データシートの表示（PDF） - RF Micro Devices

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RF2512

UHF TRANSMITTER

RF Micro Devices 

RF2512

Pin Function Description

Interface Schematic

1

OSC B2 This pin is connected directly to the reference oscillator transistor base.

The intended reference oscillator configuration is a modified Colpitts.

OSC B1

An appropriate capacitor as chosen by the customer should be con-

OSC E

nected between pin 1 and pin 2.

OSC B2

2

OSC E

This pin is connected directly to the emitter of the reference oscillator See pin 1.

transistor. An appropriate capacitor as chosen by the customer should

be connected from this pin to ground.

3

OSC B1 This pin is connected directly to the reference oscillator transistor base. See pin 1.

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.

4 PLL ENABL 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

PLL ENABL

50 kΩ

low (PLL ENABL<1.0V) powers down the PLL and VCO.

5

GND1

Ground connection for the PA buffer amp. Keep traces physically short

and connect immediately to ground plane for best performance.

6

VCC3

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.

7

LVL ADJ 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.

40 kΩ

LVL ADJ

400

4 kΩ

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.

VCC

20

TX OUT

9

GND2

Ground connection for the Tx PA functions. Keep traces physically

short and connect immediately to ground plane for best performance.

10

VCC1

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.

11 TX ENABL 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.

TX ENABL

20 kΩ

40 kΩ

11

12

PRESCL Dual-modulus/Dual-divide prescaler output. The output can be inter-

OUT

faced to an external PLL IC for additional flexibility in frequency pro-

gramming.

13

VREF P

Rev B9 010509

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.

PRESCL

OUT

11-13

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