RF105 Просмотр технического описания (PDF) - Conexant Systems

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RF105

900 MHz Digital Spread Spectrum Transceiver

Conexant Systems 

900 MHz Digital Spread Spectrum Transceiver

RF105

Recommendations on Layout and Implementation_____

A typical applications schematic is shown in Figure 4. All

Vcc pins should be decoupled as close to the supply pin as

possible, preferably right at the input pins.

All ground pins should have minimum trace inductance to

ground. If a ground plane cannot be provided right at the

pins, the vias to the ground plane should be placed as

close to the pins as possible. There should be one via for

each ground pin. If the ground plane is at the bottom layer,

it is recommended to have two vias in parallel for each

ground pin.

VCC1 (pin 6), VCC2 (pin 26), and VCC3 (pin 31) should be

connected to the common Vcc supply through individual

decoupling networks.

ESD Sensitivity _________________________________

The RF105 is a static-sensitive electronic device. Do not

operate or store near strong electrostatic fields. Take

proper Electrostatic Discharge (ESD) precautions.

SYNTHEN

STROBE

0.047µF

33pF

820pF

0.015µF

3920 Ω

820pF

3920 Ω

33pF

1000pF

Voltage

Regulator

VCC

0.056µF (optional)

CLK

FREF

51k Ω

DATA

1000pF

0.01µF

33pF

VCC

10Ω

TXD

TXDATA 1000pF

Shaping Filter

RXEN

LNAATTN

LNAIN

33pF *

10nH *

3.3pF *

1

2

3

4

5

6

7

8

9

10

11

12

Rmod

1.2k Ω

RFOUT

50Ω

TXEN

2200pF

* Matching network values are layout-dependent.

RF105

36

Cservo

35

0.082µF

34

Cservo

33

0.082µF

32

33pF

0.047µF

31

VCC

30

+

RXI

29

28

+

RXQ

27

26

VCC

25

33pF

0.047µF

Rgmc

875Ω

PS2

PS1

402 Ω

GC

0.056µF

Figure 4. Typical Applications Diagram – RF105

W117, Rev. B

Conexant

3

September 28, 1999

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