RF2938 Ver la hoja de datos (PDF) - RF Micro Devices

Número de pieza

componentes Descripción

Fabricante

RF2938

2.4GHZ SPREAD-SPECTRUM TRANSCEIVER

RF Micro Devices 

RF2938

Pin

36

37

38

39

40

41

42

43

44

45

46

47

48

Pkg

Base

Function

NC

NC

RSSI

DCFB I

DCFB Q

VCC3

VREF 2

NC

BW CTRL

VCC2

VREF 1

RX VGC

NC

ESD

Description

No internal connection. May be grounded or connected on adjacent

signal or left floating. Connect to ground for best results.

No internal connection. May be grounded or connected on adjacent

signal or left floating. Connect to ground for best results.

Received signal strength indicator. Connect 8.2pF to ground. Output

impedance is 40kΩ in parallel with 2pF.

DC feedback capacitor for in-phase channel. Requires decoupling

capacitor to ground. (22nF recommended)

DC feedback capacitor for quadrature channel. Requires capacitor to

ground. (22nF recommended)

Supply for the I and Q data amps.This pin should be bypassed with a

10nF capacitor connected as direct as possible to GND3. Ground this

pin if data amps are not used.

Gain control reference voltage. No current should be drawn from this

pin (<50µA). 2.0V nominal.

No internal connection. May be grounded or connected on adjacent

signal or left floating. Connect to ground for best results.

This pin requires a resistor to ground to set the baseband LPF band-

width of the receiver and transmit GmC filter amps.

Supply for the I and Q baseband and GmC filters. This pin should be

bypassed with a 10nF capacitor.

This is a bypass pin for the bias circuits of the GmC filter amps and for

I/Q inputs. No current should be drawn from this pin (<10µA). 1.7V

nominal.

Receiver IF and baseband amp gain control voltage. Negative slope.

No internal connection. May be grounded or connected on adjacent

signal or left floating. Connect to ground for best results.

Ground for all circuitry in the device. A very low inductance from the

base to the PCB groundplane is essential for good performance. Use

an array of vias immediately underneath the device.

This diode structure is used to provide electrostatic discharge protec-

tion to 3kV using the Human body model. The following pins are pro-

tected: 3-6, 9, 10, 12, 26-34, 38-42, 44-47.

Interface Schematic

VCC

11

Rev A8 010418

2-7

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