RF2915 Просмотр технического описания (PDF) - RF Micro Devices

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производитель

RF2915

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

RF Micro Devices 

RF2915

Pin

28

29

30

31

Function

VCC1

DATA OUT

Description

Interface Schematic

This pin is used to supply DC bias to the LNA, Mixer, first IF amplifier

and Bandgap reference. A RF bypass capacitor should be connected

directly to this pin and returned to ground. A 22 pF capacitor is recom-

mended for 915MHz applications. A 68pF capacitor is recommended

for 433MHz applications.

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. When using a RF2915 transmitter and

receiver back to back a data inversion will occur with low side LO injec-

tion.

DATA OUT

VCC3

LVL ADJ

This pin is used to supply DC bias and colletor current to the transmitter

PA. It also supplies voltage to the 2nd IF amplifier, Demodulator and

data slicer. A RF bypass capacitor should be connected directly to this

pin and returned to ground. A 22 pF capacitor is recommended for

915MHz applications. A 68pF capacitor is recommended for 433MHz

applications.

This pin is used to vary the transmitter output power. An output level

adjustment range greater than 12dB is provided through analog volt-

age control of this pin. DC current of the transmitter power amp is also

reduced with output power.

NOTE: This pin MUST be low when the transmitter is disabled.

40 kΩ

LVL ADJ

400

4 kΩ

32 RX ENABL Enable pin for the receiver circuits. RX ENABL>2.0V powers up all

receiver functions. RX ENABL<1.0V turns off all receiver functions

except the PLL functions and the RF mixer.

RX ENABL

50 kΩ

Operation

Mode

Sleep Mode

Transmit Mode

Receive Mode

PLL Lock

TX ENABL RX ENABL

Function

Low

High

Low

High

Low

Low

High

High

Entire chip is powered down. Total current consumption is <1µA. *

Transmitter, VCO are on.

Receiver, VCO are on. *

VCO is on. This mode allows time for a synthesizer loop to lock without

spending current on the transmitter or receiver.

* LVL ADJ pin must be low to disable transmitter.

11

Rev A7 001011

11-117

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