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©2008 by RF Monolithics, Inc.

RO3156A - 3/27/08

Electrical Connections

The SAW resonator is bidirectional and may be

installed 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

recommended to help reduce parasitic

capacitance in the circuit.

Typical Test Circuit

Typical Application Circuits

Temperature Characteristics

The curve shown on the right

accounts for resonator

contribution only and does not

include LC component

temperature contributions.

Typical

Circuit

Board

Land Pattern

The circuit board land pattern

shown below is one possible design. The optimum 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 minimize parasitic

series inductances.

Case Design

Terminal

Terminal

ELECTRICAL TEST

From 50

Ω

Network Analyzer

To 50

Ω

Network Analyzer

50

Ω Source

at F

C

REFLECTED

INCIDENT

P

P

Low-Loss

Matching

Network to

50

Ω

Terminal

Terminal

NC

NC

POWER TEST

CW RF Power Dissipation =

INCIDENT -

REFLECTED

P

P

C1

C2

L1

(Antenna)

+9VDC

47

RF Bypass

Modulation

Input

Typical Low-Power Transmitter Application

RO3XXXA

Bottom View

470

200k

Ω

C1

C2

L1

Output

+VDC

RF Bypass

+VDC

Typical Local Oscillator Applications

RO3XXXA

Bottom View

Dimensions Millimeters

Inches

Min

Nom

Max

Min

Nom Max

A

4.87

5.0

5.13

.191

.196

.201

B

3.37

3.5

3.63

.132

.137

.142

C

1.45

1.53

1.60

.057

.060

.062

D

1.35

1.43

1.50

.040

.057

.059

E

.67

.80

.93

.026

.031

.036

F

.37

.50

.63

.014

.019

.024

G

1.07

1.20

1.33

.042

.047

.052

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

ΔT = T

Typical Dimension:

0.010 to 0.047 inch

(0.25 to 1.20 mm)

(4 Places)

B

C

D

E (3x)

F (4x)

G (1x)

Top View

Side View

Bottom View

1

2

3

4