tda8542t NXP Semiconductors, tda8542t Datasheet - Page 4

• Manufacturer Part Number: tda8542t
• Description: 2 X 1 W Btl Audio Amplifier
• Manufacturer: NXP Semiconductors

Philips Semiconductors
PINNING
1998 Apr 01
handbook, halfpage
LGND
OUTL+
MODE
SVR
BTL/SE
n.c.
OUTR+
RGND
V
OUTR
INR
INR+
INL+
INL
OUTL
V
CCR
CCL
2
SYMBOL
1 W BTL audio amplifier
BTL/SE
OUTR
OUTL
MODE
RGND
LGND
SVR
n.c.
PIN
Fig.2 Pin configuration.
10
12
13
14
15
16
11
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
ground, left channel
positive loudspeaker terminal,
left channel
operating mode select (standby,
mute, operating)
half supply voltage, decoupling
ripple rejection
BTL loudspeaker or SE
headphone operation
not connected
positive loudspeaker terminal,
right channel
ground, right channel
supply voltage, right channel
negative loudspeaker terminal,
right channel
negative input, right channel
positive input, right channel
positive input, left channel
negative input, left channel
negative loudspeaker terminal,
left channel
supply voltage, left channel
TDA8542
MGB974
DESCRIPTION
16
15
14
13
12
11
10
9
V CCL
OUTL
INL
INL
INR
INR
OUTR
V CCR
4
FUNCTIONAL DESCRIPTION
The TDA8542(T) is a 2
capable of delivering 2
at THD = 10% using a 5 V power supply. Using the MODE
pin the device can be switched to standby and mute
condition. The device is protected by an internal thermal
shutdown protection mechanism. The gain can be set
within a range from 6 dB to 30 dB by external feedback
resistors.
Power amplifier
The power amplifier is a Bridge Tied Load (BTL) amplifier
with a complementary PNP-NPN output stage.
The voltage loss on the positive supply line is the
saturation voltage of a PNP power transistor, on the
negative side the saturation voltage of a NPN power
transistor. The total voltage loss is <1 V and with a 5 V
supply voltage and an 8
1 W can be delivered.
Mode select pin
The device is in the standby mode (with a very low current
consumption) if the voltage at the MODE pin is
>(V
level of less than 0.5 V the amplifier is fully operational.
In the range between 1.5 V and V
is in mute condition. The mute condition is useful to
suppress plop noise at the output caused by charging of
the input capacitor.
Headphone connection
A headphone can be connected to the amplifier using two
coupling capacitors for each channel. The common
GND pin of the headphone is connected to the ground of
the amplifier (see Fig.13). In this case the BTL/SE pin must
be either on a logic HIGH level or not connected at all.
The two coupling capacitors can be omitted if it is allowed
to connect the common GND pin of the headphone jack
not to ground, but to a voltage level of
In this case the BTL/SE pin must be either on a logic LOW
level or connected to ground. If the BTL/SE pin is on a
LOW level, the power amplifier for the positive
loudspeaker terminal is always in mute condition.
CC
0.5 V), or if this pin is floating. At a MODE voltage
1 W output power to an 8
1 W BTL audio power amplifier
loudspeaker an output power of
CC
Product specification
1
1.5 V the amplifier
2
V
TDA8542
CC
(see Fig.13).
load