TK15125 Ver la hoja de datos (PDF) - Toko America Inc
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TK15125 Datasheet PDF : 8 Pages
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TK15125
TIMING-CHART AND ACTION TIME AT MUTE
Test conditions: VCC = ±5 V, Timing Capacitor = 0.047 µF
The following values are typical characteristics; accordingly they are not guaranteed values.
ATTACK ACTION START (MUTE ON)
When the attack action is started (‘mute on’ is initiated), the capacitor on Pin 13 starts to charge. The voltage at the
capacitor on Pin 13 rises by 1.8 V. The 1.8 V rise time can be calculated by the following equation:
T1 ≈ Capacitance X 1.8 V =
Charge Current
0.047 µF X 1.8 V
12 µA
= 7.1 msec
When the capacitor of Pin 13 rises by 1.8 V to -3.2 V as detected by the upper limit circuit, the mute action functions
(VSS + 1.8 V = -3.2 V). In this estimate, when the capacitor on Pin 13 has risen by 0.7 V to 0.8 V, the attenuation is
approximately 90% of the final attenuation achieved. This results in the following calculation and timing chart.
T2 ≈ 0.047 µF X 0.75 V
12 µA
= 2.9 msec
This time is the attack time.
Control SW_on
-3 V
Pin 13
-4 V
Capacitor pin voltage
-5 V
1 2 3 4 5 6 7 8 (ms)
T1
T2
Input
wave
Output
wave
RELEASE ACTION START (MUTE OFF)
When the release action is started (‘mute off’ is initiated) the capacitor on Pin 13 starts to discharge. The voltage
at the capacitor on Pin 13 falls to VSS + 10 mV. This fall time can be calculated by the following equation:
T3 ≈ Capacitance X 1.8 V =
Disharge Current
0.047 µF X 1.8 V
3 µA
= 28 msec
In this estimate, when the capacitor on Pin 13 has fallen to VSS + 0.7 V to 0.8 V, the signal is restored to approximately
90% of its value. This results in the following calculation and timing chart:
T4 ≈ 0.047 µF X 1.05 V
3 µA
= 16 msec
This time is the release time.
Accordingly, the release action time is 12 msec
(T3 - T4 = 28 msec - 16 msec = 12 msec).
Control SW_off
-3 V
-4 V
Pin 13
-5 V
10 20 30 (ms)
T3
T4
Capacitor pin voltage
Output
wave
July 1999 TOKO, Inc.
Page 7
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