TK15220 Ver la hoja de datos (PDF) - Toko America Inc
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TK15220 Datasheet PDF : 12 Pages
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TK15220
TEST CIRCUITS AND METHODS (CONT.)
RESIDUAL NOISE (FIGURE 7)
This value is not a S/N ratio. This is a noise which occurs
from the device itself.
1) Pin 4 is in the open condition, or low level.
2) Connect an AC volt meter to Pin 2.
3) Connect a capacitor to GND from Pin 1.
4) Measure the AC voltage of Pin 2. This value is the noise
of Ach. If the influence of noise from outside exists, use
optional filters.
5) Next, connect Pin 4 to the VCC, or high level.
6) Remove the capacitor of Pin 1 and connect the capacitor
to Pin 3.
7) Measure in the same way.
This value is the noise level of Bch.
+
V~
VCC
+
+
5K
V~
V4
+
~ V~
V3
VCC
+
Figure 8
I/O TERMINAL VOLTAGE (FIGURE 9)
This is the DC voltage of the input and output.
Because the input and the output are nearly equal,
only the output is measured.
1) Pin 4 is in the open condition, or low level.
2) Connect a DC volt meter to Pin 2 and measure.
This value is the terminal voltage of Ach.
3) Next, connect Pin 4 to the VCC, or high level.
4) Measure in the same way.
This value is the terminal voltage of Bch.
VCC
Figure 7
+
CROSS TALK (FIGURE 8)
This is the cross talk between Ach and Bch.
1) Pin 4 is in the open condition, or low level.
2) Connect AC volt meters to Pin 2 and Pin 3.
3) Connect a capacitor and a resistance in series to GND
from Pin 1.
4) Input a sine wave (10 kHz, 1 Vrms) to Pin 3.
5) Measure the level of Pin 3 and name this V3.
6) Measure the level of Pin 2 and name this V4.
7) Calculate:
Cross Talk = 20 Log (V4 / V3)
This value is the cross talk to Ach from Bch.
8) Next, connect Pin 4 to the V , or high level.
CC
9) Change line of Pin 1 and Pin 3.
10) Input the same sine wave to Pin 1.
11) Measure and calculate in the same way.
This value is the isolation to Bch from Ach.
V
Figure 9
OUTPUT TERMINAL DIFFERENCE
This is the DC output voltage difference between Ach and
Bch. This is calculated by using values measured at the
I/O Terminal Voltage.
∆ Vcent = | (Ach DC output value) - (Bch DC output
value) |
This value is the voltage difference.
June 1999 TOKO, Inc.
Page 5
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