RF2917 データシートの表示（PDF） - RF Micro Devices

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RF2917

433/868/915MHZ FM/FSK RECEIVER

RF Micro Devices 

RF2917

Pin Function Description

Interface Schematic

29

LOOP FLT Output of the charge pump, and input to the VCO control. An RC net-

work from this pin to ground is used to establish the PLL bandwidth.

VCC

LOOP FLT

30

OSC B

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

The intended reference oscillator configuration is a modified Colpitts. A

100pF capacitor should be connected between pin 30 and pin 31.

OSC B

OSC E

31

OSC E

This pin is connected directly to the emitter of the reference oscillator See pin 30.

transistor. A 100pF capacitor should be connected from this pin to

ground.

32

PD

This pin is used to power up or down the RF2917. A logic high (PWR

DWN >2.0 V) powers up the receiver and PLL. A logic low (PWR DWN

<1.0 V) powers down circuit to standby mode.

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, 5, 7-19, 21-24, 27-31.

11

11-134

Rev B2 010118

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