RF2926 Просмотр технического описания (PDF) - RF Micro Devices

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RF2926

UHF DUAL CONVERSION TRANSCEIVER

RF Micro Devices 

RF2926

Pin Function Description

Interface Schematic

16

IF1 BP- See pin 14.

See pin 15.

17

GND7

Ground connection for 40dB IF limiting amplifier. Keep traces physically

short and connect immediately to ground plane for best performance.

18

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

19

GND6

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

short and connect immediately to ground plane for best performance.

20

VREF IF DC voltage reference for the IF limiting amplifiers. A 10nF capacitor

from this pin to ground is required.

21

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

22

IF2 BP+ DC feedback node for the 60dB limiting amplifier strip. A 10nF bypass See pin 20.

capacitor from this pin to ground is required.

23

IF2 BP- See pin 21.

See pin 20.

24 DATA OUT Demodulated data output from the demodulator. Output levels on this

are TTL/CMOS compatible. The magnitude of the load impedance is

intended to be 1MΩ or greater.

DATA OUT

25

RSSI

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

this pin. The output voltage range is 0.5V to 2.5V and increases with

increasing signal strength.

26

FM OUT Linear output from the FM demodulator. This pin is used in analog

applications when signal fidelity is important.

VCC

RSSI

FM OUT

11

27

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.

50 kΩ

DATA REF

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

VCC

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

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

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

this pin.

VCC

10 kΩ

DEMOD IN

29

VCC4

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 10nF capacitor is recommended for 10.7MHz IF

applications.

Rev A5 010404

11-189

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