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June 1999 TOKO, Inc.

TK15324

TOTAL HARMONIC DISTORTION (FIGURE 4)

Use the lower distortion oscillator for this measurement

because distortion of the TK15324 is very low.

1) Pin 5 is in the open condition, or low level.

2) Connect a distortion analyzer to Pin 3.

3) Input the sine wave (1 kHz, 1 Vrms) to Pin 4.

4) Measure the distortion of Pin 3. This value is the

distortion of 1-Ach.

5) Next connect Pin 5 to the V

6) Input the same sine wave to Pin 2.

7) Measure in the same way. This value is the distortion

of 1-Bch.

CONTROL INPUT IMPEDANCE (FIGURE 3)

This is the input resistance of control terminal.

1) Measure the inflow current from V

2) Calculate:

IMP = V

TEST CIRCUITS AND METHODS (CONT.)

Figure 2

Figure 3

This resistance is the input impedance.

VCC

Cont.

+

+

~

CONTROL LOW/HIGH LEVEL (FIGURE 2)

This level is to measure the threshold level.

1) Input, the V

other measurements, omitted from the next for simplicity)

2) Input to Pin 4 with sine wave (f = 1 kHz, V

3) Connect an oscilloscope to Pin 3.

4) Drop the control voltage gradually from V

sine wave appears at the oscilloscope. This voltage is

the threshold level when the wave appears.

VCC

+