Page 4

May 1999 TOKO, Inc.

TK15321

TEST CIRCUITS AND METHODS (CONT.)

VCC

Cont.

+

+

~

Figure 2

VCC

+

Figure 3

VCC

Cont.

+

+

Figure 4

TOTAL HARMONIC DISTORTION (FIGURE 4)

Use the lower distortion oscillator for this measurement

because distortion of the TK15321 is very low.

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

6) Input the same sine wave to Pin 2.

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

of 1-Bch.

VOLTAGE GAIN (FIGURE 5)

This is the output level against input level.

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

2) Connect AC volt meters to Pin 4 and Pin 3.

(Using the same type meter is best)

3) Input a sine wave (f = max. 20 kHz, 1 Vrms) to Pin 4.

4) Measure the level of Pin 4 and name this V1.

5) Measure the level of Pin 3 and name this V2.

6) Calculate Gain = 20 Log (( |V2 - V1| )/V1)

V1<V2 + Gain, V1>V2 - Gain

This value is the voltage gain of 1-Ach.

7) Next, connect Pin 5 to the GND, or low level.

8) Input the same sine wave to Pin 2.

9) Measure and calculate in the same way.

This value is the voltage gain of 1-Bch.

CONTROL OUTFLOW/INFLOW CURRENT (FIGURE 3)

This current means the maximum current with the control.

1) Measure the current from Pin 5 to GND. This current is

the outflow current.

2) Next, measure the current from V

This

current is the inflow current.