tda8552t NXP Semiconductors, tda8552t Datasheet - Page 7

• Manufacturer Part Number: tda8552t
• Description: 2 X 1.4 W Btl Audio Amplifiers With Digital Volume Control And Headphone Sensing
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Mode select pin
The device is in the standby mode (with a very low current
consumption) if the voltage at the MODE pin is between
V
than 0.5 V the amplifier is fully operational. In the range
between 1 V and V
condition. The mute condition is useful for using it as a ‘fast
mute’, in this mode the output signal is suppressed, while
the volume setting remains at its value. It is advised to
keep the device in the mute condition while the input
capacitor is being charged. This can be achieved by
holding the MODE pin at a level of 0.5V
approximately 100 ms before giving the first volume-UP
pulses.
Headphone sense pin (HPS)
A headphone can be connected to the amplifier by using a
coupling capacitor for each channel. The common ground
pin of the headphone is connected to the ground of the
amplifier, see Fig.4. By using the HPS pin as illustrated in
Fig.4, the TDA8552T detects if a headphone jack plug is
inserted into the connector.
2002 Jan 04
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2 x 1.4 W BTL audio amplifiers with digital
volume control and headphone sensing
and V
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0.5 V. At a mode select voltage level of less
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1 V the amplifier is in the mute
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, or by waiting
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When no headphone is plugged in, the voltage level at the
HPS pin will remain LOW. A voltage less than V
the HPS pin will keep the device in the BTL mode, thus the
loudspeakers can be operational. If the HPS pin is not
connected then the device will remain in the BTL mode.
When a headphone is plugged into the connector, the
voltage at the HPS pin will be set to V
switches to the Single-Ended (SE) mode, this means that
the slave power amplifiers at the outputs OUT1 and
OUT2 will be switched to the standby mode. This results
in floating outputs OUT1 and OUT2 , the loudspeaker
signal is thus attenuated by approximately 80 dB and only
the headphone can operate.
One of the benefits of this system is that the loudspeaker
current does not flow through the jack connector switch,
which could give some output power loss. The other
benefit is that the quiescent current is reduced when the
headphone jack is inserted.
TDA8552T; TDA8552TS
Product specification
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. The device then
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1 V at