TA8194Z View Datasheet(PDF) - Toshiba

Part Name

Description

Manufacturer

TA8194Z

MUTING IC

Toshiba 

TA8194Z

Operating Description

The TA8194Z is a muting control IC to prevent pop noise made at time of power on and off of audio

equipments.

This IC has built-in 4 terminals for sensing bias line voltage of audio equipment.

According to sensing voltage rising and setting, this IC occurs muting control signal and supply control signal.

Followings are basic operation of this IC, refer to timing chart: Page 6.

(1) Muting control signal occurs at VCC ON under any condition of B1, B2, B3 sensing voltage.

(2) Muting control signal occurs at VS output off.

(3) Muting control signal stops after (TM ON) s at VS output on.

Muting time (TM ON) depends on capacitor value connected to TC terminal: Pin(5).

(TM ON) is 1.0~1.1s (typ.) under condition of CTC = 10µF.

The above are applied in case sensing voltage rises fast enough.

Muting control off sense voltage: (VM OFF) is higher than VS ON sense voltage (VVS ON), so in case sensing

voltage rises slowly, the period sensing voltage rising from (VVS ON) to (VM ON) should be counted.

(4) Muting control signal occurs at VCC OFF. In this case, muting time depends on capacitor value connected to

CH terminal: Pin(14). This capacitor is back-up capacitor at VCC OFF. Muting control signal operation at

VCC OFF is by charge of this capacitor.

(5) Manual muting control terminal: Pin(6).

Muting control signal occurs by adding H-level signal at manual mute control terminal under any condition

of VS control output.

(6) VS control output signal occurs at condition of sensing terminal voltage is following.

VCC･B1･(B2 + B3) = H-level

(7) Sense voltage of VS ON / OFF and muting on / off control are set individually, so control signal output operate

sequentially as follows.

· Sensing voltage rising: VS control output signal stop after muting control signal occurs.

(VM ON > VVS OFF)

· Sensing voltage setting: Muting control signal stops after (TM ON) s at sensing voltage setting to

(VM OFF) after VS control output occurs. (VVS ON < VM OFF)

There are muting period before and after at VS control signal stops and occurs.

(8) Sense voltage of VS ON / OFF and muting on / off control have hysteresis voltage of 0.2~0.3V.

(9) Protection function terminal: Pin(9).

· Adding H-level control signal: VS control signal stops and muting control signal occurs.

· Adding L-level control signal from H-level: VS control signal occurs and after the period: DTP OFF,

muting control signal stops.

DTP OFF depends on capacitor value connected to TC terminal as TM ON.

5

2002-10-30

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