RF2908 查看數據表（PDF） - RF Micro Devices

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RF2908

915MHZ SPREAD SPECTRUM RECEIVER WITH PLL FREQUENCY SYNTHESIZER

RF Micro Devices 

RF2908

Pin Function Description

Interface Schematic

35 PLL ENABL This pin is used to power up or down the VCO and PLL. A logic high

(PLL ENABL>2.0V) powers up the VCO and PLL circuitry. A logic low

(PLL ENABL<1.0V) powers down the PLL and VCO.

36 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.

37

BW SEL2 Bandwidth select logic input. Pin 37 and pin 38 provide a two bit control

word for the setting of the IF bandwidth. See Table1.

38

BW SEL1 Bandwidth select logic input. Pin 37 and pin 38 provide a two bit control

word for the setting of the IF bandwidth. See Table1.

39

Q DATA Logic-level data output for the quadrature channel. This is a digital out-

put signal obtained from the output of a Schmitt trigger.

40

RSSI Q Received signal strength indicator for the quadrature channel.

41

VREF

Gain control reference voltage.

42

IF OUT Q Analog signal IF output for quadrature channel.

43

VGC

Gain control voltage.

44

VCC1

Power supply for bias circuits and VGA amplifiers for both the in-phase

and quadrature channels.

45

DCFB Q DC feedback capacitor for quadrature channel.

46

GND1

Ground for VCC1 for both the in-phase and quadrature channels.

47

IN Q-

Minus input for quadrature channel

48

IN Q+

Plus input for quadrature channel

Table 1: Bandwidth Selection Controls

BWSEL1

BWSEL2

IF-3dB

Frequency

0

0

1 MHz

0

11

1

1

2 MHz

0

4 MHz

1

1

8 MHz

11-90

Rev C1 010904

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