TA7280 Ver la hoja de datos (PDF) - Toshiba
Número de pieza
componentes Descripción
Fabricante
TA7280 Datasheet PDF : 14 Pages
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TA7280,81P
The voltage gain in this circuit is 6dB higher than that in Dual mode.
GV
=
20log
Rf
+ R1 + R2
Rf + R1
(dB)
In case of Rf = 0
GV = 52+6 = 58 (dB)
In case of Rf = 430Ω
GV = 34+6 = 40 (dB)
Each voltage gain can be set as shown above.
2. Muting
Audio muting can be accomplished by connecting pin(6) (ripple filter) to GND as shown in (Fig. 3).
Then, the bias circuits are cut off.
However, caution must be exercised to the following items.
(1) The recovery time from the muting operation is determined
by the capacities of the ripple filter capacitor between
pin(6) and GND, and of the capacitor for NF.
(2) As this muting system is operated by the short-circuit of
ripple filter: C5, the ripple rejection ratio becomes worse
in the muting condition.
At mute on, some pop noise of breaking the bias are
produced.
The output waveform at muting on
/ off during BTL, are shown in
(Fig.4).
(Provided VCC = 13.2V, RL = 4Ω, non-
signal.)
50dB or more can be obtained for
muting amount.
3
2002-10-30
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