2

• This catalog has only typical specifications because there is no space for detailed specifications. Therefore, please review our product specifications or consult the approval sheet for product specifications before ordering.

Ceramic resonators use the mechanical resonance of

piezoelectric ceramics. (Generally, lead zirconium

titanate: PZT.)

The oscillation mode varies with resonant frequency.

The table on the right shows this relationship.

As a resonator device, quartz crystal is well-known. RC

oscillation circuits and LC oscillation circuits are also

used to produce electrical resonance. The following are

① High stability of oscillation frequency:

Oscillation frequency stability is between that of

the quartz crystal and LC or RC oscillation circuits.

The temperature coefficient of quartz crystal is

for LC or RC oscillation circuits. For comparison

resonators.

② Small configuration and light weight:

The ceramic resonator is half the size of popular

quartz crystals.

③ Low price, non-adjustment:

cost and high stability.

Unlike RC or LC circuits, ceramic resonators use

mechanical resonance. This means it is not

basically affected by external circuits or by the

fluctuation of the supply voltage.

Highly stable oscillation circuits can therefore be

made without the need of adjustment.

The table briefly describes the characteristics of various

oscillator elements.

1

■

Vibration Mode and Frequency Range

Frequency (Hz)

Vibration Mode

1

Flexural

mode

2

Length

mode

3

Area

expansion

mode

4

Radius

vibration

5

Shear

thickness

mode

6

Thickness

expansion

mode

7

Surface

acoustic

wave

1k

10k 100k 1M 10M 100M

1G

■

Characteristics of Various Oscillator Elements

Name

Symbol

Price

Size

Adjust-

ment

Oscillation

Frequency

Initial

Tolerance

Long-term

Stability

LC

lower

cost

Big

Required

±2.0%

Fair

[Note] : ←̶→ show the direction of vibration

CR

lower

cost

Small

Required

±2.0%

Fair

Quartz

Crystal

Expen-

sive

Big

Not

required

±0.001%

Excellent

Ceramic

Resonator

Inexpen-

sive

Small

Not

required

±0.5%

Excellent

P17E.pdf

2012.10.31