Application Hints

The PCB is to arrange such that there are maximum ground lines (ground area) voltage supply has to be blocked

to ground by a capacitor of 10...100 nF in order to avoid distortions. Blocking should be as close as possible to

the circuit.

an external oscillator is possible to pin 4 or pin 5. The unused input must be connected to ground via capacitor

and in the same time be connected to supply voltage at pin 6.

It is recommendable to profide off earth connections 1 and 3, because in this way common - mode interferences

more effectively can be suppessed. Single - sided capacitive control of pin 1 and 2 is possible, the unused input

must be connected to ground via capacitor.

Mixer outputs 15 and 16 can be used equivalently.

Load resistances of the mixer (IF selection) at pin 15 respectively pin 16 should run to approximately 7 k

Ω.

To avoid saturation of the multiplier the maximum peak voltage occuring during operation should not exceed the

that the control characteristics of IF - and RF - part optimally be matched.

Peak voltage at pin 7 occuring during operation should not exceed 2 V that the IF output does not go into

saturation.

All the RF bypass capacitors should amount to 100 nF. Sufficient decoupling of wavemagnet and oscillator coil is

to be taken into consideration.

All components and parts must be carefully proportioned in order to obtain optimum wise characteristics.

Wavemagnets applied should so much mass as possible. The transformation ratio of the input circuitry should run

to 10...12.

In order to improve RF response characteristic a RF preselector can be additionally preceded or the wavemagnet

can be tighty coupled by means of an emitter follower impedance transformer.

Improvement of signal - to - noise ratio at average input voltages can be obtained by delayed control of the RF

part. Control should be start at approximately 1...2 mV.

TCA 440 T

~

~

~

4

5

6

2

1

3

8

11

13

9

7

14

15

12

10

16

S3

330p

±2.5%

W1a

W1

100n

+50%

-20%

R

1.8k

±2%

20

µ

±20%

8.2k

±5%

100n

+50%

-20%

4.7

µ

±50%

S1

100

±2%

W

Rp3

1.5n

±2.5%

x

A

12k

±2%

3.3n

+50%

-20%

4.7

µ

±50%

1.5n

±2.5%

Rp2

W

10n

+50%

-20%

W

1.5k

±2%

100n

+50%

-20%

25

Ω ≤ RG ≤

100

Ω

47

100n

+50%

-20%

39k

±2%

S2

• TCA440 T

Copying is generally permitted, indicating the source. However, our consent must be obtained in all cases. MEGAXESS reserves the

right to make changes in specifications at any time and without notice. The information and suggestions are given without obligation

and cannot give rise to any liability, they do not indicate the availability of the components mentioned. The information included

herein is believed to be accurate and reliable. However, MEGAXESS assumes no responsibility for its use; nor for any infringements

of patents or of other rights of third parties which may result from its use.

Megaxess GmbH Deutschland • POB 1370 • 15236 Frankfurt(Oder) • Germany

Phone +49 335 2005 • FAX +49 335 3251 • Internet http://www. megaxess.de

09/00

TCA440/T

11