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

14 MOD CTRL This pin is used to select the prescaler modulus. A logic “high” selects

64 or 128 for the prescaler divisor. A logic “low” selects 65 or 129 for

the prescaler divisor.

MOD CTL

15

DIV CTRL This pin is used to select the desired prescaler divisor. A logic “high”

selects the 64/65 divisor. A logic low selects the 128/129 divisor.

DIV CTL

16

MOD IN FM analog or digital modulation can be imparted to the VCO through See pin 18.

this pin. The VCO varies in accordance to the voltage level presented

to this pin. To set the deviation to a desired level, a voltage divider refer-

enced to Vcc is the recommended. Because the modulation varactors

are part of the resonator tank, the deviation is slightly dependent upon

the components used in the external tank.

17

VCC2

This pin is used to is supply DC bias to the VCO, prescaler, and PLL.

18

RESNTR- The RESNTR pins are used to supply DC voltage to the VCO, as well

as to tune the center frequency of the VCO. Equal value inductors

RESNTR+

should be connected to this pin and pin 20.

RESNTR-

11

4 kΩ

MOD IN

19

NC

Not internally connected.

20 RESNTR+ See pin 18.

See pin 18.

21

GND3

GND is the ground shared on chip by the VCO, prescaler, and PLL

electronics. Keep traces physically short and connect immediately to

ground plane for best performance.

22

NC

Not internally connected.

23

LOOP FLT Output of the charge pump. An RC network from this pin to ground is

used to establish the PLL bandwidth.

VCC

LOOP FLT

24

OSC SEL A logic high (OSC SEL>2.0V) applied to this pin powers on reference

oscillator 2 and powers down reference oscillator 1. A logic low (OSC

SEL<1.0V) applied to this pin powers on reference oscillator 1 and

powers down reference oscillator 2.

ESD

This diode structure is used to provide electrostatic discharge protec-

tion to 3kV using the Human body model. The following pins are pro-

VCC

tected: 1-3, 9, 10, 12-15, 17, 21, 23.

11-14

Rev B9 010509

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