TK15210 Ver la hoja de datos (PDF) - Toko America Inc
Número de pieza
componentes Descripción
Fabricante
TK15210 Datasheet PDF : 12 Pages
| |||
TK15210
TEST CIRCUITS AND METHODS (CONT.)
RESIDUAL NOISE (FIGURE 7)
VCC
+
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 high level.
2) Connect an AC volt meter to Pin 2.
5K
+
3) Connect a capacitor to GND from Pin 1.
4) Measure the AC voltage of Pin 2. This value is the noise
VV
~ ~
~
V4 V3
of Ach. If external noise exists, use optional filters to
eliminate it.
5) Next, connect Pin 4 to GND, or low level.
Figure 8
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.
I/O TERMINAL VOLTAGE (FIGURE 9)
+
V~
This is the DC voltage of the input and output.
VCC
Because the input and the output are nearly equal, only the
output is measured.
+
1) Pin 4 is in the open condition, or high 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 GND, or low 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 high level.
2) Connect AC volt meters to Pin 2 and Pin 3.
3) Connect a capactior and a resistance in series to GND
from Pin 1.
4) Input 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 Log10 (V4 / V3)
This value is the cross talk to Ach from Bch.
8) Next, connect Pin 4 to GND, or low level.
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.
January 2000 TOKO, Inc.
Page 5
Share Link: 