TA8205AHQ データシートの表示（PDF） - Toshiba
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TA8205AHQ Datasheet PDF : 14 Pages
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TA8205AHQ/ALQ
5. Muting function
Through setting pin(1) (mute terminal) at about 1V or less, muting becomes possible.
The interval circuit of IC is shown in Fig.4.
When pin(1) is set to low, Q1 and Q2 are turned to on, the charge of the ripple condenser is discharged and the
bias is cut. The mute amount of 60dB or over can be obtained.
Since this mute function rapidly discharges the charge of the ripple filter capacitor of pin(8), the pop noise is
generated by the DC fluctuation of the bias section.
Therefore, this muting function is not appropriate to the audio muting but it is effective in muting at VCC→on.
6. External parts list and description
Symbol
Recom−
mended
Value
Feature
C1
4.7µF
DC blocking
C2
47µF
Feedback
condenser
Influence
Smaller Than
Recommended Value
Larger Than
Recommended Value
Related to pop noise at VCC→on.
Related to pop noise at VCC→on.
determination of low cut−off frequency.
C2 =
1
2π・fL・Rf
Remarks
Related to gain.
Refer to item 4.
C3
220µF
Ripple
reduction
Time constant is small
at VCC→on or off.
Time constant is large
at VCC→on or off.
C4
0.12µF
Oscillation
prevention
Made liable to
oscillate.
Oscillation allowance
improved.
Refer to item 3.
C5
1000µF
Repple
filter
For filtering power supply hum and ripple.
Large at using AC rectified power supply.
Small at using DC power supply.
5
2006-04-28
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