303.825 MHz

SAW Resonator

RF Monolithics, Inc.

Phone: (972) 233-2903

Fax: (972) 387-8148

E-mail: info@rfm.com

Page 2 of 2

RFM Europe

Phone: 44 1963 251383

Fax: 44 1963 251510

http://www.rfm.com

©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.

RO2104A-061901

Electrical Connections

The SAW resonator is bidirectional and may be in-

stalled with either orientation. The two terminals

are interchangeable and unnumbered. The callout

NC indicates no internal connection. The NC pads

assist with mechanical positioning and stability.

External grounding of the NC pads is recommend-

ed to help reduce parasitic capacitance in the cir-

cuit.

Typical Test Circuit

Typical Application Circuits

Equivalent LC Mode

l

Temperature Characteristics

The curve shown on the right

accounts for resonator contri-

bution only and does not in-

clude LC component tempera-

ture contributions

.

Typical Circuit Board

Land Pattern

The circuit board land pattern shown below is one possible design. The op-

timum land pattern is dependent on the circuit board assembly process

which varies by manufacturer. The distance between adjacent land edges

should be at a maximum to minimize parasitic capacitance. Trace lengths

from terminal lands to other components should be short and wide to mini-

mize parasitic series inductances.

Case Design

The case material is black alumina with contrasting symbolization. All pads

are nominally centered with respect to the base and consist of 40 to

70 microinches electroless gold on 60-350 micorinches electroless nickel.

NC

NC

Terminal

Terminal

From 50

Ω

Network Analyzer

Network Analyzer

To 50

Ω

ELECTRICAL TEST

+9VDC

47

RF Bypass

L1

(Antenna)

C1

C2

200k

Ω

Modulation

Input

ROXXXXA

Bottom View

470

Typical Low-Power Transmitter Application

RF Bypass

L1

C1

C2

ROXXXXA

Bottom View

Typical Local Oscillator Application

+VDC

+VDC

Output

Dimensions

Millimeters

Inches

Min

Max

Min

Max

A

5.74

5.99

0.226

0.236

B

3.73

3.99

0.147

0.157

C

1.91

2.16

0.075

0.085

D

0.94

1.10

0.037

0.043

E

0.83

1.20

0.033

0.047

F

1.16

1.53

0.046

0.060

G

0.94

1.10

0.037

0.043

H

0.43

0.59

0.017

0.023

K

0.43

0.59

0.017

0.023

M

5.08

5.33

0.200

0.210

N

0.38

0.64

0.015

0.025

P

3.05

3.30

0.120

0.130

0.05 pF*

0.05 pF

Cp

Co

+

=

*Case Parasitics

Cp

Rm

Lm

Cm

-80 -60 -40 -20

0 +20 +40 +60

0

-50

-100

-150

+80

-200

0

-50

-100

-150

-200

f

∆T = T

Typical Dimension:

0.010 to 0.047 inch

(0.25 to 1.20 mm)

(4 Places)