RF2919 Просмотр технического описания (PDF) - RF Micro Devices

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RF2919

915MHz ASK/OOK receiver

RF Micro Devices 

RF2919

Pin

16

Function

IF2 IN

Description

Inverting input to the 60dB limiting amplifier strip. A 10 nF DC blocking

capacitor is required on this input. The IF2 IN input presents a nominal

330Ω input resistance and interfaces directly to 10.7MHz ceramic fil-

ters.

Interface Schematic

IF2 BP-

60 kΩ

IF2 BP+

60 kΩ

330 Ω

IF2 IN

17

IF2 BP+ DC feedback node for the 60dB limiting amplifier strip. A 10nF bypass See pin 16.

capacitor from this pin to ground is required.

18

IF2 BP- See pin 17.

See pin 16.

19

VCC3

This pin is used is supply DC bias to the 60dB IF limiting amplifier. An

IF bypass capacitor should be connected directly to this pin and

returned to ground. A 10 nF capacitor is recommended for 10.7MHz IF

applications.

20

MUTE

This pin is used to mute the data output (DATA OUT). MUTE>2.0V

75 kΩ

turns the DATA OUT signal on. MUTE<1.0V turns the DATA OUT signal

MUTE

off.

25 kΩ

21

RSSI

A DC voltage proportional to the received signal strength is output from

this pin. The output voltage increases with increasing signal strength.

VCC

22

DATA IN- The inverting input of the data comparator. The RSSI is fed to this pin

via a 50kΩ resistor. This input is available for a data filtering capacitor

that provides noise and 2x IF rejection. The value of the capacitor can

DATA IN-

be calculated by C= 1/(2πF*50kΩ) where F is the desired 3dB band-

width.

RSSI

50 kΩ

RSSI

DATA IN+

50 kΩ

23

DATA OUT The data comparator output which contains the modulating data recov-

ered from the RSSI signal. Hysteresis can be added to the comparator

by placing a very large (<1MΩ) resistor between pins 23 and 24.The

magnitude of the load impedance is intended to be 1MΩ or greater.

24

DATA IN+ The non-inverting input of the data comparator. The RSSI is fed to this See pin 22.

pin via a 50kΩ resistor. This input is available for a large filtering capac-

itor such that the modulation signal can be filtered out leaving a DC ref-

erence signal for the comparator.

25

RESNTR- This port is used to supply DC voltage to the VCO as well as to tune the

RESNTR+

center frequency of the VCO. Equal value inductors should be con-

nected to this pin and pin 26.

DATA OUT

RESNTR-

11

26 RESNTR+ See pin 25.

See pin 25.

27

VCC2

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

IF bypass capacitor should be connected directly to this pin and

returned to ground. A 10nF capacitor is recommended for 10.7MHz IF

applications.

28

GND4

GND4 is the ground shared on chip by the VCO, prescaler, and PLL

electronics.

Rev A12 001113

11-147

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