Philips TDA8552TS-N1, TDA8552T-N1 Datasheet

DATA SH EET
Preliminary specification Supersedes data of 1998 Feb 26 File under Integrated Circuits, IC01
1998 Jun 02
INTEGRATED CIRCUITS
TDA8552T; TDA8552TS
1998 Jun 02 2
Philips Semiconductors Preliminary specification
2 × 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, V
DD
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 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.
ORDERING INFORMATION
TYPE
NUMBER
PACKAGE
NAME DESCRIPTION VERSION
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
1998 Jun 02 3
Philips Semiconductors Preliminary specification
2 × 1.4 W BTL audio amplifiers with digital volume control and headphone sensing
TDA8552T; TDA8552TS
QUICK REFERENCE DATA
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
V
DD
supply voltage 2.7 5 5.5 V
I
q
quiescent supply current BTL mode; VDD=5V 14 20 mA
BTL mode; V
DD
= 3.3 V 10 15 mA
SE mode; V
DD
=5V 8.5 12 mA
SE mode; V
DD
= 3.3 V 58mA
I
stb
standby current 110µA
P
o
output power THD = 10%; RL=8Ω; VDD=5V 1 1.4 W
G
v
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
N
step
number of volume steps 64
THD total harmonic distortion P
o
= 0.5 W 0.1 %
SVRR supply voltage ripple
rejection
50 −−dB
1998 Jun 02 4
Philips Semiconductors Preliminary specification
2 × 1.4 W BTL audio amplifiers with digital volume control and headphone sensing
TDA8552T; TDA8552TS
BLOCK DIAGRAM
Fig.1 Block diagram.
handbook, full pagewidth
MGM608
20 k
15 k
20 k 20 k
3.4 k
1.6 k
20 dB
30 dB
20 k
15 k
20 k 20 k
3.4 k
1.6 k
15 k
15 k
15 k
15 k
20 dB
30 dB
0.5V
DD
0.5V
DD
0.5V
DD
0.5V
DD
0.5V
DD
0.5V
DD
V
DD
V
DD
0.5V
DD
0.5V
DD
VOLUME CONTROL
VOLUME CONTROL
MASTER
SLAVE
TDA8552T
MASTER
SLAVE
UP/DOWN COUNTER
INTERFACE
UP/DOWN COUNTER
INTERFACE
STANDBY/MUTE
AND OPERATING
GAIN
SELECTION
UP/DOWN1
UP/DOWN2
IN1
17
6
16
15
7
5 4
IN2
SVR
MODE
HPS
GAINSEL GND1 to GND4
OUT2
OUT2+
OUT1
OUT1+
V
DD1VDD2VDD3VDD4
381318
12
19
2
9
1, 10, 11, 2014
up down
up down
1998 Jun 02 5
Philips Semiconductors Preliminary specification
2 × 1.4 W BTL audio amplifiers with digital volume control and headphone sensing
TDA8552T; TDA8552TS
PINNING
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.
SYMBOL PIN
(1)
DESCRIPTION
GND1 1 ground 1, substrate/leadframe OUT2+ 2 positive loudspeaker terminal
output channel 2
V
DD1
3 supply voltage 1
HPS 4 digital input for headphone
sensing
MODE 5 digital trinary input for mode
selection (standby, mute and operating)
UP/DOWN1 6 digital trinary input for volume
control channel 1
UP/DOWN2 7 digital trinary input for volume
control channel 2
V
DD2
8 supply voltage 2
OUT2 9 negative loudspeaker terminal
output channel 2 GND2 10 ground 2, substrate/leadframe GND3 11 ground 3, substrate/leadframe OUT1+ 12 positive loudspeaker terminal
output channel 1 V
DD3
13 supply voltage 3 GAINSEL 14 digital input for gain selection IN2 15 audio input channel 2 SVR 16 half supply voltage, decoupling
ripple rejection IN1 17 audio input channel 1 V
DD4
18 supply voltage 4
OUT1 19 negative loudspeaker terminal
output channel 1 GND4 20 ground 4, substrate/leadframe
Fig.2 Pin configuration.
handbook, halfpage
GND1
OUT2+
V
DD1 HPS
MODE UP/DOWN1 UP/DOWN2
V
DD2
OUT2
GND2
GND4 OUT1 V
DD4
IN1
IN2 GAINSEL
SVR
V
DD3
OUT1+ GND3
1 2 3 4 5 6 7 8 9
10
11
12
20 19 18 17 16 15 14 13
TDA8552T
MGM610
1998 Jun 02 6
Philips Semiconductors Preliminary specification
2 × 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 8 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 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 V
DD
(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 pins 6 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 (t
wait
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 V
DD
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.
80 64
------
1.25 dB=
1
t
rep
--------
1998 Jun 02 7
Philips Semiconductors Preliminary specification
2 × 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 V
DD
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 V
DD
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 0.5V
DD
, 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 V
DD
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.
1998 Jun 02 8
Philips Semiconductors Preliminary specification
2 × 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; note 1
Note
1. The power rating is based on R
th(j-a)
with recommended copper pattern of at least 4 × 1cm2 to the corner leads and
copper under the IC package.
SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT
V
DD
supply voltage operating 0.3 +5.5 V
V
i
input voltage 0.3 VDD+ 0.3 V
I
ORM
repetitive peak output current 1A
T
stg
storage temperature 55 +150 °C
T
amb
operating ambient temperature 40 +85 °C
V
sc
AC and DC short-circuit safe voltage 5.5 V
P
tot
maximum power dissipation SO20 2.2 W
SSOP20 1.1 W
SYMBOL PARAMETER CONDITIONS VALUE UNIT
R
th(j-a)
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
V
DD
(V) RL()
Po(W)
THD = 10%
OPERATION
MUSIC POWER
P
max
(W)
T
amb(max)
(°C)
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
1998 Jun 02 9
Philips Semiconductors Preliminary specification
2 × 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
V
DD
=5V; T
amb
=25°C; RL=8Ω; V
MODE
= 0 V; total gain setting at 7 dB; according to Fig.4.; unless otherwise
specified.
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
V
DD
supply voltage 2.7 5 5.5 V
I
DD
supply current BTL mode; VDD=5V;
RL=∞; note 1
14 20 mA
SE mode; V
DD
=5V 8.5 12 mA
BTL mode; V
DD
= 3.3 V;
RL= ; note 1
10 15 mA
SE mode; V
DD
= 3.3 V 58mA
I
stb
standby current V
MODE=VDD
110µA
V
O
DC output voltage note 2 2.5 V
V
OUT+
V
OUT
differential output offset
voltage
GAINSEL = 0 V −−50 mV GAINSEL = V
DD
−−150 mV
Mode select pin
V
MODE
input voltage standby VDD− 0.5 − V
DD
V
mute 1 V
DD
1.4 V
operating 0 0.5 V
I
MODE
input current 0 < V
MODE<VDD
−−1µA
α
mute
mute attenuation note 3 80 tbf dB
Gain select pin
V
GAINSEL
input voltage low gain (20 dB) 0 0.6 V
high gain (30 dB) 4.1 V
DD
V
I
GAINSEL
input current −−1µA
Headphone sense pin
V
HPS
input voltage SE mode; headphone
detected
VDD− 1 V
DD
V
I
HPS
input current −−1µA
Loading...
+ 19 hidden pages