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TDA8552T-TDA8552TS
2 x 1.4 W BTL audio amplifiers with digital volume control and headphone sensing

Philips Semiconductors Preliminary speciﬁcation × 1.4 W BTL audio ampliﬁers with digital
volume control and headphone sensing TDA8552T ; TDA8552TS
FEATURES One pin digital volume control (for each channel) Volume setting with up/down pulses Auto repeat function on volume setting Headphone sensing Maximum gain set by selection pin Low sensitivity for EMC radiation Internal feedback resistors Flexibility in use Few external components Low saturation voltage of output stage Standby mode controlled by CMOS compatible levels Low standby current No switch-on/switch-off plops High supply voltage ripple rejection Protected against electrostatic discharge Outputs short-circuit safe to ground, VDD and across the
load Thermally protected.
APPLICATIONS Portable consumer products Notebook computers Communication equipment.
GENERAL DESCRIPTION
The TDA8552T is a two channel audio power amplifier that
provides an output power of 2× 1.4 W into an 8 Ω load
using a 5 V power supply. The circuit contains two BTL
power amplifiers, two digital volume controls and
standby/mute logic. Volume and balance of the amplifiers
are controlled using two digital input pins which can be
driven by simple push-buttons or by a microcontroller.
Using the selection pin (GAINSEL) the maximum gain can
be set at 20or30 dB. The headphone sense input (HPS)
can be used to detect if a headphone is plugged into the
jack connector. If a headphone is plugged into the jack
connector the amplifier switches from the BTL to the SE
mode and the BTL loudspeakers are switched off. This
also results in a reduction of quiescent current
consumption.
The TDA8552T is contained in a 20-pin small outline
package. For the TDA8552TS, which is contained in a
20-pin very small outline package, the maximum output
power is limited by the maximum allowed ambient
temperature. More information can be found in Section
“Thermal design considerations”. The SO20 package has
the four corner leads connected to the die pad so that the
thermal behaviour can be improved by the PCB layout.
ORDERING INFORMATION
Philips Semiconductors Preliminary speciﬁcation × 1.4 W BTL audio ampliﬁers with digital
volume control and headphone sensing TDA8552T; TDA8552TS
QUICK REFERENCE DATA
Philips Semiconductors Preliminary speciﬁcation × 1.4 W BTL audio ampliﬁers with digital
volume control and headphone sensing TDA8552T; TDA8552TS
BLOCK DIAGRAM
Philips Semiconductors Preliminary speciﬁcation × 1.4 W BTL audio ampliﬁers with digital
volume control and headphone sensing TDA8552T; TDA8552TS
PINNING
Note For the SO20 (SOT163-1) package only: the ground
pins1, 10,11 and 20 are mechanically connected to
the leadframe and electrically to the substrate of the
die. On the PCB the ground pins can be connected to
a copper area to decrease the thermal resistance.
Philips Semiconductors Preliminary speciﬁcation × 1.4 W BTL audio ampliﬁers with digital
volume control and headphone sensing TDA8552T; TDA8552TS
FUNCTIONAL DESCRIPTION
The TDA8552T is a 2× 1.4 W BTL audio power amplifier
capable of delivering 2× 1.4 W output power into an 8Ω
load at THD= 10% using a 5 V power supply. The gain of
the amplifier can be set by the digital volume control.
The gain in the maximum volume setting is 20 dB (low
gain) or 30 dB (high gain). This maximum gain can be
selected by the gain selection pin. The headphone sense
input (HPS) can be used to detect if a headphone is
plugged into the jack connector. If a headphone is plugged
into the jack connector the amplifier switches from the BTL
to the SE mode and the BTL loudspeakers are switched
off. This also results in a reduction of quiescent current
consumption. Using the MODE pin the device can be
switched to the standby condition, the mute condition or
the normal operating condition. The device is protected by
an internal thermal shutdown protection mechanism.
Power ampliﬁer
The power amplifier is a Bridge-Tied Load (BTL) amplifier
with a complementary CMOS output stage. The total
voltage loss for both output power MOS transistors is
within 1 V and with a 5 V supply and an 8 Ω loudspeaker
an output power of 1.4 W can be delivered. The total gain
of this power amplifier can be set at 20 or 30 dB by the
gain selection pin.
Gain selection
The gain selection can be used for a fixed gain setting,
depending on the application. The gain selection pin must
be hard wired to ground (20 dB) or to VDD (30 dB). Gain
selecting during the operation is not advised, switching is
not guaranteed plop free.
Input attenuator
The volume control operates as a digitally controlled input
attenuator between the audio input pin and the power
amplifier. In the maximum volume control setting the
attenuation is 0 dB and in the minimum volume control
setting the typical attenuation is 80 dB. The attenuation
can be set in 64 steps by the UP/DOWN pin. Both
attenuators for channels 1 and 2 are separated from each
other and are controlled by there own UP/DOWN pin.
Balance control can be arranged by applying UP/DOWN
pulses only on pins6 and 7, see Fig.5.
Volume control
Each attenuator is controlled with its own UP/DOWN pin
(trinary input): Floating UP/DOWN pin: volume remains unchanged Negative pulses: decreasing volume Positive pulses: increasing volume.
Each pulse on the UP/DOWN pin results in a change in
gain of (typical value).
In the basic application the UP/DOWN pin is switched to
ground or VDD by a double push-button. When the supply
voltage is initially connected, after a complete removal of
the supply, the initial state of the volume control is an
attenuation of 40 dB (low volume), so the gain of the total
amplifier is −20 dB in the low gain setting or −10 dB in the
high gain setting. After powering-up, some positive pulses
have to be applied to the UP/DOWN pin for turning up to
listening volume.
Auto repeat
If the UP/DOWN pin is LOW or HIGH for the wait time (twait
in seconds) (one of the keys is pressed) then the device
starts making up or down pulses by itself with a frequency
given by (repeat function).
The wait time and the repeat frequency are set using an
internal RC oscillator with an accuracy of ±10%.
Volume settings in standby mode
When the device is switched with the MODE select pin to
the mute or the standby condition, the volume control
attenuation setting keeps its value, under the assumption
that the voltage on the VDD pin does not fall below the
minimum supply voltage. After switching the device back
to the operation mode, the previous volume setting is
maintained. In the standby mode the volume setting is
maintained as long as the minimum supply voltage is
available. The current consumption is very low,
approximately 1 μA (typ.). In battery fed applications the
volume setting can be maintained during battery exchange
if there is a supply capacitor available.------ 1.25 dB=rep
--------
Philips Semiconductors Preliminary speciﬁcation × 1.4 W BTL audio ampliﬁers with digital
volume control and headphone sensing TDA8552T; TDA8552TS
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
VDD and VDD− 0.5 V. At a mode select voltage level of less
than 0.5 V the amplifier is fully operational. In the range
between 1 V and VDD−1 V the amplifier is in the mute
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 0.5VDD, or by waiting
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.
When no headphone is plugged in, the voltage level at the
HPS pin will remain LOW. A voltage less than VDD− 1V at
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 VDD. The device then
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.
Philips Semiconductors Preliminary speciﬁcation × 1.4 W BTL audio ampliﬁers with digital
volume control and headphone sensing TDA8552T; TDA8552TS
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
THERMAL CHARACTERISTICS
See Section “Thermal design considerations” in Chapter “Test and application information”.
Table 1 Power rating; note1
Note The power rating is based on Rth(j-a) with recommended copper pattern of at least 4× 1cm2 to the corner leads and
copper under the IC package.
Philips Semiconductors Preliminary speciﬁcation × 1.4 W BTL audio ampliﬁers with digital
volume control and headphone sensing TDA8552T; TDA8552TS
QUALITY SPECIFICATION
Quality specification in accordance with “SNW-FQ-611 part E”, if this type is used as an audio amplifier.
DC CHARACTERISTICS
VDD =5V; Tamb =25 °C; RL =8 Ω; VMODE=0 V; total gain setting at 7 dB; according to Fig.4.; unless otherwise
speciﬁed.
Philips Semiconductors Preliminary speciﬁcation × 1.4 W BTL audio ampliﬁers with digital
volume control and headphone sensing TDA8552T; TDA8552TS
Notes With a load connected at the outputs the quiescent current will increase, the maximum of this increase being equal The DC output voltage with respect to ground is approximately 0.5VDD. Output voltage in mute position is measured with an input of 1 V (RMS) in a bandwidth of 20 kHz, so including noise,
gain select pin is LOW (0V). DC output offset voltageL
----------------------------------------------------------------×
Philips Semiconductors Preliminary speciﬁcation × 1.4 W BTL audio ampliﬁers with digital
volume control and headphone sensing TDA8552T; TDA8552TS
AC CHARACTERISTICS (VDD= 3.3V)
Tamb =25 °C; RL =8 Ω; f=1 kHz; total gain setting at 7 dB; VMODE=0 V; gain select pin is at 0V
(maximum gain=20 dB); according to Fig.4.
Notes Volume setting at maximum. The noise output voltage is measured at the output in a frequency band from 20 Hz to 20 kHz (unweighted),
Rsource =0 Ω, gain select pin is LOW (0 V). Supply voltage ripple rejection is measured at the output, with a source impedance of Rsource =0 Ω at the input.
The ripple voltage is a sine wave with a frequency of 1 kHz and an amplitude of 100 mV (RMS) is applied to the
positive supply rail, gain select pin is LOW (0 V). Channel suppression is measured at the output with a source impedance of Rsource =0 Ω at the input and a
frequency of 1 kHz. The output level in the operating single-ended channel (OUT+) is set at 2 V (RMS).
Philips Semiconductors Preliminary speciﬁcation × 1.4 W BTL audio ampliﬁers with digital
volume control and headphone sensing TDA8552T; TDA8552TS
AC CHARACTERISTICS (VDD =5V)
Tamb =25 °C; RL =8 Ω; f=1 kHz; total gain setting at 7 dB; VMODE=0 V; Gain select pin is at 0V
(maximum gain=20 dB); according to Fig.4; package is SO20.
Notes Volume setting at maximum. The noise output voltage is measured at the output in a frequency band from 20 Hz to 20 kHz (unweighted),
Rsource =0Ω. Supply voltage ripple rejection is measured at the output, with a source impedance of Rsource =0 Ω at the input.
The ripple voltage is a sine wave with a frequency of 1 kHz and an amplitude of 100 mV (RMS) is applied to the
positive supply rail, gain select pin is LOW (0 V). Channel suppression is measured at the output with a source impedance of Rsource =0 Ω at the input and a
frequency of 1 kHz. The output level in the operating single-ended channel (OUT+) is set at 1 V (RMS).
Philips Semiconductors Preliminary speciﬁcation × 1.4 W BTL audio ampliﬁers with digital
volume control and headphone sensing TDA8552T; TDA8552TS
AC CHARACTERISTICS (FOR HEADPHONE; RL =32 Ω; CONNECTED SE)
VDD =5V; Tamb =25 °C; f=1 kHz; total gain setting at 20 dB; VMODE=0 V; gain select pin is 0V
(maximum gain=20 dB); according to Fig.4.
Notes The noise output voltage is measured at the output in a frequency band from 20 Hz to 20 kHz (unweighted),
Rsource =0 Ω, gain select pin is LOW (0 V). Supply voltage ripple rejection is measured at the output, with a source impedance of Rsource =0 Ω at the input.
The ripple voltage is a sine wave with a frequency of 1 kHz and an amplitude of 100 mV (RMS) is applied to the
positive supply rail, gain select pin is LOW (0 V).
Philips Semiconductors Preliminary speciﬁcation × 1.4 W BTL audio ampliﬁers with digital
volume control and headphone sensing TDA8552T; TDA8552TS
TEST AND APPLICATION INFORMATION

Partno	Mfg	Dc	Qty	Available	Descript
TDA8552T	PHILIPS	N/a	68	avai	2 x 1.4 W BTL audio amplifiers with digital volume control and headphone sensing
TDA8552TS	PHI	N/a	831	avai	2 x 1.4 W BTL audio amplifiers with digital volume control and headphone sensing