INTEGRATED CIRCUITS
DATA SHEET
TDA7057AQ
2 × 8 W stereo BTL audio output amplifier with DC volume control
Product specification |
1998 Apr 07 |
Supersedes data of 1997 July 15
File under Integrated Circuits, IC01
Philips Semiconductors |
Product specification |
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2 × 8 W stereo BTL audio output amplifier
TDA7057AQ
with DC volume control
FEATURES
∙DC volume control
∙Few external components
∙Mute mode
∙Thermal protection
∙Short-circuit proof
∙No switch-on and switch-off clicks
∙Good overall stability
∙Low power consumption
∙Low HF radiation
∙ESD protected on all pins.
QUICK REFERENCE DATA
GENERAL DESCRIPTION
The TDA7057AQ is a stereo BTL output amplifier with DC volume control. The device is designed for use in TVs and monitors, but is also suitable for battery-fed portable recorders and radios.
Missing Current Limiter (MCL)
A MCL protection circuit is built-in. The MCL circuit is activated when the difference in current between the output terminal of each amplifier exceeds 100 mA (typical 300 mA). This level of 100 mA allows for single-ended headphone applications.
SYMBOL |
PARAMETER |
CONDITIONS |
MIN. |
TYP. |
MAX. |
UNIT |
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VP |
supply voltage |
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4.5 |
− |
18 |
V |
Pout |
output power |
VP = 12 V; RL = 16 Ω |
3.0 |
3.5 |
− |
W |
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VP = 12 V; RL = 8 Ω |
− |
5.3 |
− |
W |
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VP = 15 V; RL = 8 Ω |
− |
8 |
− |
W |
Gv |
voltage gain |
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39.5 |
40.5 |
41.5 |
dB |
Gv |
voltage gain control |
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68 |
73.5 |
− |
dB |
Iq(tot) |
total quiescent current |
VP = 12 V; RL = ∞ |
− |
22 |
25 |
mA |
THD |
total harmonic distortion |
Po = 0.5 W |
− |
0.3 |
1 |
% |
ORDERING INFORMATION
TYPE |
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PACKAGE |
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NUMBER |
NAME |
DESCRIPTION |
VERSION |
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TDA7057AQ |
DBS13P |
plastic DIL-bent-SIL power package; 13 leads (lead length 12 mm) |
SOT141-6 |
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1998 Apr 07 |
2 |
Philips Semiconductors |
Product specification |
2 × 8 W stereo BTL audio output amplifier
TDA7057AQ
with DC volume control
BLOCK DIAGRAM
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V P |
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TDA7057AQ |
4 |
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input 1 |
3 |
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I |
i |
13 |
positive |
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output 1 |
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DC volume |
1 |
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Ι |
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control 1 |
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I |
i |
11 |
negative |
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output 1 |
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Vref |
STABILIZER |
TEMPERATURE |
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PROTECTION |
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input 2 |
5 |
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I |
i |
10 |
negative |
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output 2 |
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DC volume |
7 |
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ΙΙ |
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control 2 |
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I |
i |
8 |
positive |
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output 2 |
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2 |
6 |
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12 |
9 |
MSA714 |
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not |
signal |
power |
power |
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connected |
ground |
ground 1 |
ground 2 |
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Fig.1 Block diagram.
1998 Apr 07 |
3 |
Philips Semiconductors |
Product specification |
2 × 8 W stereo BTL audio output amplifier
TDA7057AQ
with DC volume control
PINNING
SYMBOL |
PIN |
DESCRIPTION |
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VC1 |
1 |
DC volume control 1 |
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n.c. |
2 |
not connected |
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Vl (1) |
3 |
voltage input 1 |
VP |
4 |
positive supply voltage |
Vl (2) |
5 |
voltage input 2 |
SGND |
6 |
signal ground |
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VC2 |
7 |
DC volume control 2 |
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OUT2+ |
8 |
positive output 2 |
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PGND2 |
9 |
power ground 2 |
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OUT2− |
10 |
negative output 2 |
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OUT1− |
11 |
negative output 1 |
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PGND1 |
12 |
power ground 1 |
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OUT1+ |
13 |
positive output 1 |
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FUNCTIONAL DESCRIPTION
The TDA7057AQ is a stereo output amplifier with two DC volume control stages. The device is designed for TVs and monitors, but is also suitable for battery-fed portable recorders and radios.
In conventional DC volume control circuits the control or input stage is AC-coupled to the output stage via external capacitors to keep the offset voltage low.
In the TDA7057AQ the two DC volume control stages are integrated into the input stages so that no coupling capacitors are required and a low offset voltage is still maintained. The minimum supply voltage also remains low.
The BTL principle offers the following advantages:
∙Lower peak value of the supply current
∙The frequency of the ripple on the supply voltage is twice the signal frequency.
Consequently, a reduced power supply with smaller capacitors can be used which results in cost reductions.
handbook, halfpage
VC1 |
1 |
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n.c. |
2 |
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VI (1) |
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3 |
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VP |
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4 |
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VI (2) |
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5 |
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SGND |
6 |
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TDA7057AQ |
VC2 |
7 |
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OUT2 |
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8 |
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PGND2 |
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9 |
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OUT2 |
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10 |
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OUT1 |
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11 |
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PGND1 |
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12 |
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OUT1 |
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13 |
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MSA716
Fig.2 Pin configuration.
For portable applications there is a trend to decrease the supply voltage, resulting in a reduction of output power at conventional output stages. Using the BTL principle increases the output power.
The maximum gain of the amplifier is fixed at 40.5 dB. The DC volume control stages have a logarithmic control characteristic. Therefore, the total gain can be controlled from +40.5 dB to −33 dB. If the DC volume control voltage falls below 0.4 V, the device will switch to the mute mode.
The amplifier is a short-circuit protected to ground, VP and across the load. A thermal protection circuit is also implemented. If the crystal temperature rises above +150 °C the gain will be reduced, thereby reducing the output power.
Special attention is given to switch-on and switch-off clicks, low HF radiation and a good overall stability.
1998 Apr 07 |
4 |
Philips Semiconductors |
Product specification |
2 × 8 W stereo BTL audio output amplifier
TDA7057AQ
with DC volume control
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOL |
PARAMETER |
CONDITIONS |
MIN. |
MAX. |
UNIT |
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VP |
supply voltage |
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− |
18 |
|
V |
IORM |
repetitive peak output current |
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− |
1.25 |
|
A |
IOSM |
non-repetitive peak output current |
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− |
1.5 |
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A |
Ptot |
total power dissipation |
Tcase < 60 °C |
− |
22.5 |
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W |
Tamb |
operating ambient temperature |
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−40 |
+85 |
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°C |
Tstg |
storage temperature |
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−55 |
+150 |
°C |
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Tvj |
virtual junction temperature |
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− |
150 |
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°C |
tsc |
short-circuit time |
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− |
1 |
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hr |
Vn |
input voltage pins 1, 3, 5 and 7 |
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− |
5 |
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V |
THERMAL CHARACTERISTICS |
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SYMBOL |
PARAMETER |
VALUE |
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UNIT |
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Rth j-c |
thermal resistance from junction to case |
4 |
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K/W |
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Rth j-a |
thermal resistance from junction to ambient in free air |
40 |
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K/W |
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Power dissipation
Assume VP = 12 V and RL = 16 Ω. The maximum sine wave dissipation is 2 × 1.8 W = 3.6 W. At Tamb(max) = 60 °C:
= (150 − 60)/3.6 = 25 K/W.
= Rth j-c + Rth c-hs + Rth hs.
= 25 − 4 = 21 K/W.
5
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