RF2945PCBA-L Просмотр технического описания (PDF) - RF Micro Devices

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RF2945PCBA-L

433/868/915MHZ FSK/ASK/OOK TRANSCEIVER

RF Micro Devices 

RF2945

Pin Function Description

Interface Schematic

14

IF1 BP+ DC feedback node for the 40dB limiting amplifier strip. A 10nF bypass See pin 13.

capacitor from this pin to ground is required.

15

IF1 BP- Same as pin 14.

See pin 13.

16

IF1 OUT IF output from the 40dB limiting amplifier. The IF1 OUT output presents

a nominal 330 Ω output resistance and interfaces directly to 10.7MHz

ceramic filters.

IF1 OUT

17

IF2 IN

IF input to the 60dB limiting amplifier strip. A 10nF DC blocking capaci-

tor is required on this input. The IF2 IN input presents a nominal 330 Ω

input resistance and interfaces directly to 10.7MHz ceramic filters.

IF2 BP+

60 kΩ

IF2 BP-

60 kΩ

330

330

IF2 IN

18

IF2 BP+ DC feedback node for the 60dB limiting amplifier strip. A 10nF bypass See pin 17.

capacitor from this pin to ground is required.

19

IF2 BP- Same as pin 18.

See pin 17.

20

GND6

Ground connection for 60dB IF limiting amplifier. Keep traces physically

short and connect immediately to ground plane for best performance.

21 DEMOD IN This pin is the input to the FM demodulator. This pin is NOT AC cou-

pled. Therefore, a DC blocking capacitor is required on this pin to avoid

shorting the demodulator input with the LC tank. A ceramic discrimina-

tor or DC blocked LC tank resonant at the IF should be connected to

this pin.

VCC

DEMOD IN

10 kΩ

11

22

DATA REF This pin is used for setting the adaptive Data Slicer DC reference level.

A capacitor from this pin to ground can be used to set the reference

level at the average DC level of the data bit stream.The DC level deter-

mines the bit decision threshold.

50kΩ

DATA REF

23

MOD IN FM analog or digital modulation can be imparted to the VCO through See pin 24.

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. This deviation is also dependent

upon the overall capacitance of the external resonant circuit.

24

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 25 although a small imbalance can be used

to tune in the proper frequency range.

RESNTR-

4 kΩ

MOD IN

25

RESNTR- See RESNTR+ description.

See pin 24.

26

VCO OUT This pin is used is supply a buffered VCO output to go to the PLL chip.

This pin has a DC bias and needs to be AC coupled.

VCO OUT

27

GND4

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

electronics.

11-220

Rev A10 000919

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