TDA8948J Datasheet PDF - NXP Semiconductors

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TDA8948J
NXP Semiconductors

Part Number TDA8948J
Description 4-channel audio amplifier
Page 26 Pages


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TDA8948J
4-channel audio amplifier
Rev. 01 — 27 February 2008
www.DataSheet4U.com
Product data sheet
1. General description
The TDA8948J contains four identical audio power amplifiers. The TDA8948J can be used
as four Single-Ended (SE) channels with a fixed gain of 26 dB, two times Bridge-Tied
Load (BTL) channels with a fixed gain of 32 dB or two times SE channels (26 dB gain)
plus one BTL channel (32 dB gain) operating as a 2.1 system.
The TDA8948J comes in a 17-pin Dil-Bent-Sil (DBS) power package. The TDA8948J is
pin compatible with the TDA8944AJ, TDA8946AJ and TDA8947J.
The TDA8948J contains a unique protection circuit that is solely based on multiple
temperature measurements inside the chip. This gives maximum output power for all
supply voltages and load conditions with no unnecessary audio holes. Almost any supply
voltage and load impedance combination can be made as long as thermal boundary
conditions (number of channels used, external heat sink and ambient temperature) allow
it.
2. Features
2.1 Functional features
I SE: 1 W to 18 W, BTL: 4 W to 36 W operation possibility (2.1 system)
Soft clipping.
I Standby and mute mode.
I No on/off switching plops.
I Low standby current.
I High supply voltage ripple rejection.
I Outputs short-circuit protected to ground, supply and across the load.
I Thermally protected.
I Pin compatible with TDA8944AJ, TDA8946AJ and TDA8947J.
3. Applications
I Television
I PC speakers
I Boom box
I Mini and micro audio receivers



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TDA8948J
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4-channel audio amplifier
4. Quick reference data
Table 1. Quick reference data
SE: VCC = 17 V; Tamb = 25 °C; RL = 4 ; fi = 1 kHz; VMODE1 = VCC; VMODE2 = VCC; measured in test
circuit Figure 11; unless otherwise specified.
BTL: VCC = 17 V; Tamb = 25 °C; RL = 8 ; f = 1 kHz; VMODE1 = VCC; VMODE2 = VCC; measured in test
circuit Figure 11; unless otherwise specified.
Symbol Parameter
Conditions
Min Typ Max Unit
VCC supply voltage operating
[1] 9
17 26 V
no (clipping signal) [2] - - 28 V
Iq
Istb
Po(SE)
quiescent current
standby current
SE output power
VCC = 17 V; RL =
-
VCC = 17 V;
see Figure 7:
[3] -
-
100 145 mA
- 10 µA
Po(BTL)
BTL output power
THD = 10 %;
RL = 4
THD = 0.5 %;
RL = 4
VCC = 20 V:
THD = 10 %;
RL = 4
VCC = 17 V;
see Figure 7:
6.5 8
-6
-
-
W
W
- 12 - W
THD
Gv
total harmonic
distortion
voltage gain
THD = 10 %;
RL = 8
THD = 0.5 %;
RL = 8
VCC = 20 V:
THD = 10 %;
RL = 8
SE; Po = 1 W
BTL; Po = 1 W
SE
BTL
14 16 -
- 12 -
W
W
- 24 - W
- 0.1 0.5 %
-
0.05 0.5
%
25 26 27 dB
31 32 33 dB
SVRR
supply voltage ripple SE:
rejection
fripple = 1 kHz
fripple =
100 Hz to 20 kHz
[4] -
[4] -
60 -
60 -
dB
dB
BTL:
fripple = 1 kHz
fripple =
100 Hz to 20 kHz
[4] -
[4] -
65 -
65 -
dB
dB
[1] A minimum load is required at supply voltages of VCC > 22 V; RL = 3 for SE and RL = 6 for BTL.
[2] The amplifier can deliver output power with non-clipping output signals into nominal loads as long as the
ratings of the IC are not exceeded.
[3] With a load connected at the outputs the quiescent current will increase.
TDA8948J_1
Product data sheet
Rev. 01 — 27 February 2008
© NXP B.V. 2008. All rights reserved.
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TDA8948J
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4-channel audio amplifier
[4] Supply voltage ripple rejection is measured at the output with a source impedance RSOURCE = 0 at the
input and with a frequency range from 20 Hz to 22 kHz (unweighted). The ripple voltage is a sine wave with
a frequency fripple and an amplitude of 300 mV (RMS), which is applied to the positive supply rail.
5. Ordering information
Table 2. Ordering information
Type number
Package
Name
Description
TDA8948J
DBS17P
DBS17P: plastic DIL-bent-SIL power package; 17 leads
(lead length 12 mm)
6. Block diagram
Version
SOT243-1
TDA8948J_1
Product data sheet
IN1+ 8
60 k
IN2+ 6
60 k
IN3+ 9
60 k
IN4+ 12
60 k
CIV 13
VCC
VCC1
3
+
+
+
+
VCC2
16
+
+
1 OUT1+
4 OUT2
14 OUT3
17 OUT4+
SHORT-CIRCUIT
AND
TEMPERATURE
PROTECTION
SVR 11 0.5VCC
7
SGND
MODE1 10
MODE2 5
Fig 1. Block diagram
VREF
STANDBY ALL
MUTE ALL
ON 1 + 2
MUTE 3 + 4
ON 3 + 4
TDA8948J
2
GND1
15
GND2
010aaa049
Rev. 01 — 27 February 2008
© NXP B.V. 2008. All rights reserved.
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7. Pinning information
7.1 Pinning
TDA8948J
www.DataSheet4U.com
4-channel audio amplifier
OUT1+ 1
GND1 2
VCC1 3
OUT24
MODE2 5
IN2+ 6
SGND 7
IN1+ 8
IN3+ 9
MODE1 10
SVR 11
IN4+ 12
CIV 13
OUT314
GND2 15
VCC2 16
OUT4+ 17
Fig 2. Pin configuration diagram
TDA8948J
010aaa046
7.2 Pin description
Table 3.
Symbol
OUT1+
GND1
VCC1
OUT2
MODE2
IN2+
SGND
IN1+
IN3+
MODE1
SVR
IN4+
CIV
OUT3
Pin description
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Description
non inverted loudspeaker output of channel 1
ground of channels 1 and 2
supply voltage channels 1 and 2
inverted loudspeaker output of channel 2
mode selection 2 input: Mute and On mode for channels 3 and 4
input channel 2
signal ground
input channel 1
input channel 3
mode selection 1 input: Standby, Mute and On mode for all
channels
half supply voltage decoupling (ripple rejection)
input channel 4
common input voltage decoupling
inverted loudspeaker output of channel 3
TDA8948J_1
Product data sheet
Rev. 01 — 27 February 2008
© NXP B.V. 2008. All rights reserved.
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