EVB72005

315MHz FSK/ASK Transmitter

Evaluation Board Description

39012 72005 01

Page 9 of 14

EVB Description

Rev. 007

June/07

5 6

4

23

1

12 34 56

RPS

CB0

CX2

XTAL

CX1

CB1

2

3

4

5

1

9

8

76

10

CK

CM1

CM3

LM

LT

CM2

OUT

4

50

Fig. 7:

Circuit diagram with 50

Ω matching network

4.1

Board Component Values to Fig. 7

Part

Size

Value

@ 315 MHz

Tolerance

Description

CM1

0805

10 pF

±5%

impedance matching capacitor

CM2

0805

15 pF

±5%

impedance matching capacitor

CM3

0805

82 pF

±5%

impedance matching capacitor

LM

0805

47 nH

±5%

impedance matching inductor

LT

0805

33 nH

±5%

output tank inductor

0805

15 pF

±5%

XOSC FSK capacitor (

Δf = ±20 kHz), note 1

0805

27 pF

±5%

CX2

0805

47 pF

±5%

XOSC capacitor (

Δf = ±20 kHz), note 1, only needed for FSK

RPS

0805

NIP

±5%

power-select resistor, see data sheet section 4.6

CB0

1206

220 nF

±20%

de-coupling capacitor

CB1

0805

330 pF

±10%

de-coupling capacitor

XTAL

HC49/S

9.84375MHz

±30ppm cal., ±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