PR

EL

IM

INA

RY

EVB72036

868/915MHz FSK/ASK Transmitter

Evaluation Board Description

3901272036 01

Page 7 of 12

EVB Description

Rev. 002

June/07

3

50

Fig. 6:

Circuit diagram with 50

Ω matching network

3.1

Board Component Values

Part

Size

Value @

868.3 MHz

Value @

915 MHz

Toler-

ance

Description

CM1

0805

1.8 pF

2.2 pF

±5%

impedance matching capacitor

CM2

0805

5.6 pF

5.6 pF

±5%

impedance matching capacitor

CM3

0805

68 pF

68 pF

±5%

impedance matching capacitor r

LM

0805

12 nH

10 nH

±5%

impedance matching inductor

LT

0805

15 nH

10 nH

±5%

output tank inductor

0805

22 pF

22 pF

±5%

XOSC FSK capacitor (

Δf = ±20 kHz), note 1

0805

27 pF

27 pF

±5%

CX2

0805

12pF

12 pF

±5%

XOSC capacitor (

Δf = ±20 kHz), note 1, only for FSK

CCK

0805

15 pF/ 180 pF

±5%

capacitor to control clock voltage swing (CKDIV 0 / 1)

RPS

0805

NIP

±5%

power-select resistor, see data sheet section 4.6

R1

0805

0

Ω

±5%

ASK jumper (for ASK only), see data sheet sect. 4.7

CB0

1206

220 nF

±20%

de-coupling capacitor

CB1

0805

330 pF

±10%

de-coupling capacitor

27.13438 MHz 28.59375 MHz

XTAL

SMD

6x3.5

±30ppm cali., ±30ppm temp

fundamental mode crystal,

CK

0805

1 nF

±10%

ROI coupling capacitor, only required for

external reference frequency input

Note 1:

depends on crystal parameters, other ∆f values can be selected with other CX1, CX2 values

NIP – not in place, may be used optionally