TDA8551.PDF

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INTEGRATED CIRCUITS
DATA SHEET
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
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
•
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
load
•
Thermally protected.
QUICK REFERENCE DATA
SYMBOL
V
P
I
q
I
stb
P
o
G
v
n
vol
THD
SVRR
PARAMETER
supply voltage
quiescent current
standby current
output power
voltage gain
number of volume steps
total harmonic distortion
supply voltage ripple rejection
P
o
= 0.5 W
THD = 10%; R
L
= 8
Ω;
V
P
= 5 V
V
P
= 5 V
CONDITIONS
MIN.
2.7
−
−
1
−60
−
−
48
TYP.
5
6
−
1.4
−
64
0.15
−
GENERAL DESCRIPTION
TDA8551
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
Ω
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.
APPLICATIONS
•
Portable consumer products
•
Personal computers
•
Telephony.
MAX.
5.5
10
10
−
+20
−
−
−
UNIT
V
mA
µA
W
dB
%
dB
ORDERING INFORMATION
TYPE
NUMBER
TDA8551T
TDA8551
PACKAGE
NAME
SO8
DIP8
DESCRIPTION
plastic small outline package; 8 leads; body width 3.9 mm
plastic dual in-line package; 8 leads (300 mil)
VERSION
SOT96-1
SOT97-1
1998 Feb 23
2
Philips Semiconductors
Product specification
1 W BTL audio amplifier with digital volume control
BLOCK DIAGRAM
TDA8551
handbook, full pagewidth
VP
6
UP/DOWN
1
INTERFACE
up
UP/DOWN
COUNTER
MASTER
IN
4
VOLUME
CONTROL
VP
20 kΩ
8
OUT+
down
TDA8551
15 kΩ
SVR
3
5 kΩ
R
R
STANDBY/
MUTE/
OPERATING
2
MODE
15 kΩ
5
SLAVE
MGK363
OUT−
7
GND
Fig.1 Block diagram.
PINNING
SYMBOL
UP/DOWN
MODE
SVR
IN
OUT−
V
P
GND
OUT+
PIN
1
2
3
4
5
6
7
8
DESCRIPTION
digital trinary input for volume
control
digital trinary input for mode
selection (standby, mute, operating)
half supply voltage, decoupling
ripple rejection
audio input
negative loudspeaker output
terminal
supply voltage
ground
positive loudspeaker output
terminal
Fig.2 Pin configuration.
handbook, halfpage
UP/DOWN 1
MODE 2
8 OUT+
7
GND
VP
OUT−
TDA8551
SVR
IN
3
4
MGK362
6
5
1998 Feb 23
3
Philips Semiconductors
Product specification
1 W BTL audio amplifier with digital volume control
FUNCTIONAL DESCRIPTION
The TDA8551; TDA8551T is a 1 W BTL audio power
amplifier capable of delivering 1 W output power to 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. 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
Ω
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.
TDA8551
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
P
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 V
P
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
P
and V
P
−
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
P
−
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 0.5V
P
, or by waiting approximately 100 ms
before giving the first volume-UP pulses.
1998 Feb 23
4
Philips Semiconductors
Product specification
1 W BTL audio amplifier with digital volume control
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOL
V
P
V
I
I
ORM
T
stg
T
amb
V
sc
P
tot
PARAMETER
supply voltage
input voltage
repetitive peak output current
storage temperature
operating temperature
AC and DC short-circuit safe voltage
maximum power dissipation
SO8
DIP8
QUALITY SPECIFICATION
CONDITIONS
MIN.
−0.3
−0.3
−
−55
−40
−
−
−
TDA8551
MAX.
+5.5
V
P
+ 0.3
1
+150
+85
5.5
0.8
1.2
V
V
A
°C
°C
V
W
W
UNIT
Quality according to
“SNW-FQ-611 part E”,
if this type is used as an audio amplifier. Quality specifications are listed in
the
“Quality reference handbook”,
order number 9397 750 00192.
THERMAL CHARACTERISTICS
SYMBOL
R
th j-a
SO8
DIP8
PARAMETER
thermal resistance from junction to ambient
CONDITIONS
in free air
160
100
K/W
K/W
VALUE
UNIT
1998 Feb 23
5

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