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CERAMIC RESONATOR PRINCIPLES - page 4 / 7

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3994.21

3991.80

3997.49

3995.46

4000.87

3997.96

3998.18

3995.96

4001.09

3998.87

3998.37

3996.01

From this data, it is possible to predict that the standard ZTA4.00MG resonator will have an approximate +0.06% frequency shift from the original 4.00MHz ±0.5% initial tolerance. This is of course a negligible shift and will not affect circuit performance in any way.

CERAMIC RESONATOR APPLICATIONS

By actually setting up this circuit as well as the standard test circuit shown in Fig.3.1 below, it is possible to establish the average shift that can be expected when using the ZTA4.OMG with a 6805 processor. The actual data is shown below:

RESONATOR SAMPLE #

1 2 3 4 5 X

IC: MC6805C4

IC: CD4O69UBE

Figure 3.1) Basic Oscillation Circuit with CMOS Inverter

INV.1

IC

INV.2

IC

VDD Output

R f = 1 M

IC: CD4069UBE (MOS) X: Ceramic Resonator

R

d

C

L1

=C

L2

= Loading Capacitance

Rd: Damping Resistance

C

L1

X

C

L2

190 ~ 249KHz

+5V

330pF

470pF

1M

0

250 ~ 374KHz

+5V

220pF

470pF

1M

0

375 ~ 429KHz

+5V

120pF

470pF

1M

0

430 ~ 699KHz

+5V

100pF

100pF

1M

0

700 ~ 1250KHZ

+5V

100pF

100pF

1M

5.6K

1.25 ~ 1.80MHz

+5V

30pF

30pF

1M

0

1.80 ~ 6.30MHz

+5V

30pF

30pF

1M

0

6.31 ~ 13.0MHz

+12V

30pF

30pF

1M

0

OUTPUT

FREQUENCY RANGE

VDD

CL1

CIRCUIT CONSTANT

CL2

Rf

Rd

CD4069UBE (RCA)

Figure 3.2) CMOS Standard Circuit

14

V

DD

1

CL1

R

d

CL2

7

4

3

R

f

2

190 ~ 374KHz

470pF

470pF

1M

5.6K

375 ~ 429KHz

330pF

330pF

1M

5.6K

430 ~ 699KHz

220pF

220pF

1M

5.6K

700 ~ 999KHz

150pF

150pF

1M

5.6K

1000 ~ 1250KHz

100pF

100pF

1M

5.6K

1.251 ~ 1.80Mhz

100pF

100pF

1M

1.0K

1.80 ~ 6.30MHz

100pF

100pF

1M

680

6.31 ~ 13.0MHz

100pF

100pF

1M

220

13.01 ~ 19.99 MHz

30pF

30pF

1M

0

20.00 ~ 25.99MHz

15pF

15pF

1M

0

26.00 ~ 32.00Mhz

5pF

5pF

1M

0

OUTPUT

FREQUENCY RANGE

CL1

CIRCUIT CONSTANT

CL2

Rf

Rd

TC74HCUO4 (TOSHIBA)

Figure 3.3) HCMOS Standard Circuit

V

DD

14

+5VDC

1

CL1

R

d

CL2

7

4

3

R

f

2

ECS, INC. INTERNATIONAL 1105 S. RIDGEVIEW, OLATHE, KS 66062 • 913-782-7787 • 800-237-1041 • FAX 913-782-6991 • WWW.ECSXTAL.COM

TECHNICAL REFERENCE

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TECHNICAL REFERENCE

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