Philips TDA8552TS, TDA8552T Datasheet

INTEGRATED CIRCUITS

DATA SH EET

TDA8552T; TDA8552TS

2 × 1.4 W BTL audio amplifiers with
digital volume control and
headphone sensing

Preliminary specification
Supersedes data of 1998 Feb 26
File under Integrated Circuits, IC01

1998 Jun 02

Philips Semiconductors Preliminary specification

2 × 1.4 W BTL audio amplifiers with digital
volume control and headphone sensing

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, V

load

• Thermally protected.

APPLICATIONS

and across the

DD

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 20 or 30 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.

TDA8552T; TDA8552TS

• Portable consumer products

• Notebook computers

• Communication equipment.

ORDERING INFORMATION

TYPE

NUMBER

TDA8552T SO20 plastic small outline package; 20 leads; body width 7.5 mm SOT163-1
TDA8552TS SSOP20 plastic shrink small outline package; 20 leads; body width 4.4 mm SOT266-1

NAME DESCRIPTION VERSION

PACKAGE

1998 Jun 02 2

Philips Semiconductors Preliminary specification

2 × 1.4 W BTL audio amplifiers with digital

TDA8552T; TDA8552TS

volume control and headphone sensing

QUICK REFERENCE DATA

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

V

DD

I

q

I

stb

P

o

G

v

N

step

THD total harmonic distortion P
SVRR supply voltage ripple

supply voltage 2.7 5 5.5 V
quiescent supply current BTL mode; VDD=5V − 14 20 mA

BTL mode; V
SE mode; V
SE mode; V

= 3.3 V − 10 15 mA

DD

=5V − 8.5 12 mA

DD

= 3.3 V − 58mA

DD

standby current − 110µA
output power THD = 10%; RL=8Ω; VDD=5V 1 1.4 − W
voltage gain low gain; maximum volume − 20 − dB

low gain; minimum volume −−60 − dB
high gain; maximum volume − 30 − dB
high gain; minimum volume −−50 − dB

number of volume steps − 64 −

= 0.5 W − 0.1 − %

o

50 −−dB

rejection

1998 Jun 02 3

Philips Semiconductors Preliminary specification

2 × 1.4 W BTL audio amplifiers with digital
volume control and headphone sensing

BLOCK DIAGRAM

handbook, full pagewidth

17

IN1

UP/DOWN1

SVR

IN2

6

16

15

VOLUME
CONTROL

20
kΩ

0.5V

DD

UP/DOWN
COUNTER

up down

INTERFACE

VOLUME
CONTROL

20
kΩ

20 dB

30 dB

V

DD

15 kΩ

0.5V

DD

15 kΩ

0.5V

3.4 kΩ

1.6 kΩ

DD

0.5V

TDA8552T; TDA8552TS

V

DD1VDD2VDD3VDD4

381318

MASTER

15 kΩ

20 kΩ
20 kΩ

SLAVE

DD

TDA8552T

MASTER

12

OUT1+

19

OUT1−

2

OUT2+

UP/DOWN2

MODE

HPS

0.5V

UP/DOWN
COUNTER

7

INTERFACE

5

STANDBY/MUTE

4

AND OPERATING

DD

up down

20 dB

0.5V

DD

SELECTION

3.4 kΩ

1.6 kΩ

DD

0.5V

GAIN

V

DD

30 dB

15 kΩ

0.5V

15 kΩ

Fig.1 Block diagram.

15 kΩ

20 kΩ
20 kΩ

SLAVE

DD

1, 10, 11, 2014

GAINSEL GND1 to GND4

9

OUT2−

MGM608

1998 Jun 02 4

Philips Semiconductors Preliminary specification

2 × 1.4 W BTL audio amplifiers with digital
volume control and headphone sensing

PINNING

SYMBOL PIN

GND1 1 ground 1, substrate/leadframe
OUT2+ 2 positive loudspeaker terminal

V

DD1

HPS 4 digital input for headphone

MODE 5 digital trinary input for mode

UP/DOWN1 6 digital trinary input for volume

UP/DOWN2 7 digital trinary input for volume

V

DD2

OUT2− 9 negative loudspeaker terminal

GND2 10 ground 2, substrate/leadframe
GND3 11 ground 3, substrate/leadframe
OUT1+ 12 positive loudspeaker terminal

V

DD3

GAINSEL 14 digital input for gain selection
IN2 15 audio input channel 2
SVR 16 half supply voltage, decoupling

IN1 17 audio input channel 1
V

DD4

OUT1− 19 negative loudspeaker terminal

GND4 20 ground 4, substrate/leadframe

(1)

DESCRIPTION

output channel 2

3 supply voltage 1

sensing

selection (standby, mute and
operating)

control channel 1

control channel 2

8 supply voltage 2

output channel 2

output channel 1

13 supply voltage 3

ripple rejection

18 supply voltage 4

output channel 1

handbook, halfpage

UP/DOWN1
UP/DOWN2

TDA8552T; TDA8552TS

GND1

1

OUT2+

2

V

3

DD1
HPS

4

MODE

5

TDA8552T

6
7

V

8

DD2

OUT2−

9

GND2

10

MGM610

Fig.2 Pin configuration.

20
19
18
17
16
15
14
13
12
11

GND4
OUT1−
V

DD4

IN1
SVR
IN2
GAINSEL
V

DD3

OUT1+
GND3

Note

1. For the SO20 (SOT163-1) package only: the ground
pins 1, 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.

1998 Jun 02 5

Philips Semiconductors Preliminary specification

2 × 1.4 W BTL audio amplifiers with digital
volume control and headphone sensing

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 8 Ω
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

TDA8552T; TDA8552TS

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 (t
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).

80

-----­64

1

-------­t

rep

1.25 dB=

wait

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 V
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 pins 6 and 7, see Fig.5.

1998 Jun 02 6

(30 dB). Gain

DD

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 V
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.

pin does not fall below the

DD

Philips Semiconductors Preliminary specification

2 × 1.4 W BTL audio amplifiers with digital
volume control and headphone sensing

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

and VDD− 0.5 V. At a mode select voltage level of less

DD

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.

− 1 V the amplifier is in the mute

DD

, or by waiting

DD

TDA8552T; TDA8552TS

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 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.

− 1V at

DD

1998 Jun 02 7

Philips Semiconductors Preliminary specification

2 × 1.4 W BTL audio amplifiers with digital

TDA8552T; TDA8552TS

volume control and headphone sensing

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 134).

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

V

DD

V

i

I

ORM

T

stg

T

amb

V

sc

P

tot

THERMAL CHARACTERISTICS

See Section “Thermal design considerations” in Chapter “Test and application information”.

SYMBOL PARAMETER CONDITIONS VALUE UNIT

R

th(j-a)

supply voltage operating −0.3 +5.5 V
input voltage −0.3 VDD+ 0.3 V
repetitive peak output current − 1A
storage temperature −55 +150 °C
operating ambient temperature −40 +85 °C
AC and DC short-circuit safe voltage − 5.5 V
maximum power dissipation SO20 − 2.2 W

SSOP20 − 1.1 W

thermal resistance from junction to ambient

for the TDA8552T (SO20) in free air 60 K/W

extra copper 55 K/W

for the TDA8552TS (SSOP20) in free air 110 K/W

extra copper 80 K/W

Table 1 Power rating; note 1

MUSIC POWER

V

(V) RL(Ω)

DD

Po(W)

THD = 10%

OPERATION

T

P

(W)

max

amb(max)

SO20 SSOP20

3.3 4 0.9 BTL 0.55 120 106

3.3 8 0.6 BTL 0.28 134 127

3.3 16 0.3 BTL 0.14 142 139

3.3 32SE 0.035 headphone 0.03 150 150

5.0 4 2.0 BTL 1.25 81 50

5.0 8 1.4 BTL 0.65 114 98

5.0 16 0.8 BTL 0.32 132 124

5.0 32SE 0.09 headphone 0.07 146 144
continuous sine wave

3.3 4 0.9 BTL 1.1 89 62

5 8 1.4 BTL 1.25 81 50

Note

1. The power rating is based on R

with recommended copper pattern of at least 4 × 1cm2 to the corner leads and

th(j-a)

copper under the IC package.

(°C)

1998 Jun 02 8

Philips Semiconductors Preliminary specification

2 × 1.4 W BTL audio amplifiers with digital

TDA8552T; TDA8552TS

volume control and headphone sensing

QUALITY SPECIFICATION

Quality specification in accordance with

DC CHARACTERISTICS

V

DD

=5V; T

=25°C; RL=8Ω; V

amb

specified.

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

V

DD

I

DD

I

stb

V

O

V

OUT+

− V

OUT−

supply voltage 2.7 5 5.5 V
supply current BTL mode; VDD=5V;

standby current V
DC output voltage note 2 − 2.5 − V

 differential output offset

voltage

Mode select pin

V

MODE

I

MODE

α

mute

input voltage standby VDD− 0.5 − V

input current 0 < V
mute attenuation note 3 80 tbf − dB

Gain select pin

V

GAINSEL

I

GAINSEL

input voltage low gain (20 dB) 0 − 0.6 V

input current −−1µA

Headphone sense pin

V

I

HPS

HPS

input voltage SE mode; headphone

input current −−1µA

“SNW-FQ-611 part E”

= 0 V; total gain setting at 7 dB; according to Fig.4.; unless otherwise

MODE

, if this type is used as an audio amplifier.

− 14 20 mA

RL=∞; note 1
SE mode; V
BTL mode; V

=5V − 8.5 12 mA

DD

DD

= 3.3 V;

− 10 15 mA

RL= ∞; note 1
SE mode; V

MODE=VDD

= 3.3 V − 58mA

DD

− 110µA

GAINSEL = 0 V −−50 mV
GAINSEL = V

DD

−−150 mV

mute 1 − V
operating 0 − 0.5 V

MODE<VDD

−−1µA

high gain (30 dB) 4.1 − V

VDD− 1 − V

detected

DD

− 1.4 V

DD

DD

DD

V

V

V

1998 Jun 02 9