tda7053at-n2 NXP Semiconductors, tda7053at-n2 Datasheet - Page 4

• Manufacturer Part Number: tda7053at-n2
• Description: Stereo Btl Audio Output Amplifier With Dc Volume Control
• Manufacturer: NXP Semiconductors

Philips Semiconductors
PINNING
FUNCTIONAL DESCRIPTION
The TDA7053A and TDA7053AT are stereo output
amplifiers with two DC volume control stages, designed for
TV and monitors, but 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.
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:
Consequently, a reduced power supply with smaller
capacitors can be used which results in cost reductions.
1997 Jul 15
n.c.
VC1
n.c.
V
V
V
SGND
VC2
OUT2+
PGND2
n.c.
OUT2
OUT1
PGND1
n.c.
OUT1+
SYMBOL
I (1)
P
I (2)
Lower peak value of the supply current
The frequency of the ripple on the supply voltage is twice
the signal frequency.
Stereo BTL audio output amplifier with DC
volume control
PIN
10
12
13
14
15
16
11
1
2
3
4
5
6
7
8
9
not connected
DC volume control 1
not connected
voltage input 1
positive supply voltage
voltage input 2
signal ground
DC volume control 2
positive output 2
power ground 2
not connected
negative output 2
negative output 1
power ground 1
not connected
positive output 1
DESCRIPTION
4
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 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 short-circuit protected to ground, V
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.
SGND
V
V
VC1
VC2
I (1)
I (2)
n.c.
n.c.
V P
Fig.2 Pin configuration.
1
2
3
4
5
6
7
8
TDA7053AT
TDA7053A
MSA719 - 2
15
14
13
12
10
16
11
9
Product specification
n.c.
PGND1
PGND2
OUT1
TDA7053A
OUT1
OUT2
n.c.
OUT2
P
and