Philips TDA8551 Datasheet

INTEGRATED CIRCUITS
DATA SH EET
TDA8551
1 W BTL audio amplifier with digital volume control
Product specification Supersedes data of 1997 May 07 File under Integrated Circuits, IC01
1998 Feb 23
Philips Semiconductors Product specification
1 W BTL audio amplifier with digital volume control TDA8551
FEATURES
One pin digital volume control
Volume setting with UP/DOWN pulses
Flexibility in use
Few external components
Low saturation voltage of output stage
standby mode controlled by CMOS compatible levels
GENERAL DESCRIPTION
The TDA8551; TDA8551T is a one channel 1 W Bridge-Tied Load (BTL) audio power amplifier capable of delivering 1 W output power to an 8 load at THD = 10% using a 5 V power supply. The circuit contains a BTL power amplifier, a digital volume control and standby/mute logic. The TDA8551T comes in an 8 pin SO package and the TDA8551 in a 8 pin DIP package.
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
P
and across the
APPLICATIONS
Portable consumer products
Personal computers
Telephony.
load
Thermally protected.
QUICK REFERENCE DATA
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
V
P
I
q
I
stb
P
o
G
v
n
vol
THD total harmonic distortion P
supply voltage 2.7 5 5.5 V quiescent current VP=5V 610mA standby current −−10 µA output power THD = 10%; RL=8Ω; VP= 5 V 1 1.4 W voltage gain 60 +20 dB number of volume steps 64
= 0.5 W 0.15 %
o
SVRR supply voltage ripple rejection 48 −−dB
ORDERING INFORMATION
TYPE
NUMBER
NAME DESCRIPTION VERSION
PACKAGE
TDA8551T SO8 plastic small outline package; 8leads; body width 3.9 mm SOT96-1 TDA8551 DIP8 plastic dual in-line package; 8 leads (300 mil) SOT97-1
1998 Feb 23 2
Philips Semiconductors Product specification
1 W BTL audio amplifier with digital volume control TDA8551
BLOCK DIAGRAM
handbook, full pagewidth
UP/DOWN
SVR
1
4
IN
3
OPERATING
INTERFACE
downup
UP/DOWN COUNTER
VOLUME
CONTROL
STANDBY/
MUTE/
27
MODE
V
P
15 k
15 k
GND
TDA8551
V
P
6
MASTER
20 k
5 k
R R
SLAVE
MGK363
8
OUT+
5
OUT
Fig.1 Block diagram.
PINNING
SYMBOL PIN DESCRIPTION
UP/DOWN 1 digital trinary input for volume
control
MODE 2 digital trinary input for mode
selection (standby , mute, operating)
SVR 3 half supply voltage, decoupling
ripple rejection IN 4 audio input OUT 5 negative loudspeaker output
terminal V
P
6 supply voltage GND 7 ground OUT+ 8 positive loudspeaker output
terminal
1998 Feb 23 3
handbook, halfpage
UP/DOWN
1 2
TDA8551
3
SVR
4
IN
MGK362
Fig.2 Pin configuration.
8 7 6 5
OUT+ GNDMODE V
P
OUT
Philips Semiconductors Product specification
1 W BTL audio amplifier with digital volume control TDA8551
FUNCTIONAL DESCRIPTION
The TDA8551; TDA8551T is a 1 W BTL audio power amplifier capable of delivering 1 W output power to 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. In the maximum volume setting the gain is 20 dB. Using the MODE pin the device can be switched to the standby condition, the mute condition and 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 W can be delivered. The total gain of this power amplifier is internally fixed at 20 dB.
Volume control
The volume control operates as a digital controlled 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. This UP/DOWN pin is a trinary input:
Floating UP/DOWN pin: volume remains unchanged
Negative pulses: setting volume towards minimum
Positive pulses: setting volume towards maximum.
Each pulse on the UP/DOWN pin results in a change in gain of 80/64 = 1.25 dB (typical value). In the basic application the UP/DOWN pin is switched to ground or V 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. After powering-up, some positive pulses have to be applied to the UP/DOWN pin for turning up to listening volume. When the device is switched with the MODE select pin to the mute or the standby condition, the volume control attenuation setting remains on its value, assumed that the voltage on pin VP does not fall below the minimum supply voltage. After switching the device back to the operation mode, the previous volume setting is maintained.
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 VP− 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 VP− 1.4 V the amplifier is in the mute condition. The mute condition is useful for using it as a ‘fast mute’; in this mode 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 done by holding the MODE pin at a level of 0.5VP, or by waiting approximately 100 ms before giving the first volume-UP pulses.
P
P
1998 Feb 23 4
Philips Semiconductors Product specification
1 W BTL audio amplifier with digital volume control TDA8551
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT
V
P
V
I
I
ORM
T
stg
T
amb
V
sc
P
tot
QUALITY SPECIFICATION
supply voltage 0.3 +5.5 V input voltage 0.3 VP+ 0.3 V repetitive peak output current 1A storage temperature 55 +150 °C operating temperature 40 +85 °C AC and DC short-circuit safe voltage 5.5 V maximum power dissipation SO8 0.8 W
DIP8 1.2 W
Quality according to the
“Quality reference handbook”
“SNW-FQ-611 part E”
, order number 9397 750 00192.
, if this type is used as an audio amplifier. Quality specifications are listed in
THERMAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS VALUE UNIT
R
th j-a
thermal resistance from junction to ambient in free air
SO8 160 K/W DIP8 100 K/W
1998 Feb 23 5
Philips Semiconductors Product specification
1 W BTL audio amplifier with digital volume control TDA8551
CHARACTERISTICS
V
=5V; T
P
test circuit of Fig.4.
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
DC characteristics
V
P
I
q
I
stb
V
O
V
OUT+
Mode select pin
V
MODE
I
MODE
α mute attenuation note 3 80 90 dB
=25°C; RL=8Ω; V
amb
supply voltage 2.7 5 5.5 V quiescent current RL= ; note 1 610 mA standby current V DC output voltage note 2 2.5 V
V
differential output offset −−50 mV
OUT
input voltage standby mode VP− 0.5 V
input current 0 < V
= 0 V; total gain setting at +7 dB (unless otherwise specified); measured in
MODE
MODE=VP
mute mode 1 V
−−10 µA
P P
operating mode 0 0.5 V
MODE<VP
−−100 nA
V
1.4 V
Volume control
t
rep
V
th(UP)
V
float(max)
V
float(min
V
th(DOWN)
I
UP/DOWN
G
v(max)
) UP/DOWN pin floating low level 1.0 −− V
pulse repetition time 100 −− ns UP/DOWN pin up threshold level 4.2 V
P
V
UP/DOWN pin floating high level −−3.4 V
UP/DOWN pin down threshold level 0 0.6 V input current UP/DOWN pin 0 < V maximum voltage gain (including
UP/DOWN<VP
−−200 µA 19 20 21 dB
power amplifier)
G
v(min)
minimum voltage gain (including
62 60 58 dB
power amplifier)
n
vol
G
v
Z
i
V
i(rms)(max)
number of volume steps 64 voltage gain variation per step 1.25 dB input impedance 14 20 k maximum input voltage (RMS value) −−2.0 V
AC characteristics (f = 1 kHz)
P
o
output power THD = 10% 1 1.4 W
THD = 0.5% 0.6 1.0 W THD total harmonic distortion P V
n(o)
noise output voltage note 5 60 100 µV
= 0.5 W; note 4 0.15 0.5 %
o
SVRR supply voltage ripple rejection note 6 48 53 dB V
i(IN)(max)
maximum input voltage on pin IN THD = 1%;
−−2.0 V Gv= 50 dB to 0 dB
1998 Feb 23 6
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