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TDA8948J_1

© NXP B.V. 2008. All rights reserved.

Product data sheet

Rev. 01 — 27 February 2008

25 of 26

NXP Semiconductors

TDA8948J

4-channel audio amplifier

18. Legal information

18.1

Data sheet status

[1]

Please consult the most recently issued document before initiating or completing a design.

[2]

The term ‘short data sheet’ is explained in section “Definitions”.

[3]

The product status of device(s) described in this document may have changed since this document was published and may differ in case of multiple devices. The latest product status
information is available on the Internet at URL

http://www.nxp.com

.

18.2

Definitions

Draft — The document is a draft version only. The content is still under
internal review and subject to formal approval, which may result in
modifications or additions. NXP Semiconductors does not give any
representations or warranties as to the accuracy or completeness of
information included herein and shall have no liability for the consequences of
use of such information.

Short data sheet — A short data sheet is an extract from a full data sheet
with the same product type number(s) and title. A short data sheet is intended
for quick reference only and should not be relied upon to contain detailed and
full information. For detailed and full information see the relevant full data
sheet, which is available on request via the local NXP Semiconductors sales
office. In case of any inconsistency or conflict with the short data sheet, the
full data sheet shall prevail.

18.3

Disclaimers

General — Information in this document is believed to be accurate and
reliable. However, NXP Semiconductors does not give any representations or
warranties, expressed or implied, as to the accuracy or completeness of such
information and shall have no liability for the consequences of use of such
information.

Right to make changes — NXP Semiconductors reserves the right to make
changes to information published in this document, including without
limitation specifications and product descriptions, at any time and without
notice. This document supersedes and replaces all information supplied prior
to the publication hereof.

Suitability for use — NXP Semiconductors products are not designed,
authorized or warranted to be suitable for use in medical, military, aircraft,
space or life support equipment, nor in applications where failure or
malfunction of an NXP Semiconductors product can reasonably be expected
to result in personal injury, death or severe property or environmental

damage. NXP Semiconductors accepts no liability for inclusion and/or use of
NXP Semiconductors products in such equipment or applications and
therefore such inclusion and/or use is at the customer’s own risk.

Applications — Applications that are described herein for any of these
products are for illustrative purposes only. NXP Semiconductors makes no
representation or warranty that such applications will be suitable for the
specified use without further testing or modification.

Quick reference data — The Quick reference data is an extract of the
product data given in the Limiting values and Characteristics sections of this
document, and as such is not complete, exhaustive or legally binding.

Limiting values — Stress above one or more limiting values (as defined in
the Absolute Maximum Ratings System of IEC 60134) may cause permanent
damage to the device. Limiting values are stress ratings only and operation of
the device at these or any other conditions above those given in the
Characteristics sections of this document is not implied. Exposure to limiting
values for extended periods may affect device reliability.

Terms and conditions of sale — NXP Semiconductors products are sold
subject to the general terms and conditions of commercial sale, as published
at

http://www.nxp.com/profile/terms

, including those pertaining to warranty,

intellectual property rights infringement and limitation of liability, unless
explicitly otherwise agreed to in writing by NXP Semiconductors. In case of
any inconsistency or conflict between information in this document and such
terms and conditions, the latter will prevail.

No offer to sell or license — Nothing in this document may be interpreted
or construed as an offer to sell products that is open for acceptance or the
grant, conveyance or implication of any license under any copyrights, patents
or other industrial or intellectual property rights.

18.4

Trademarks

Notice: All referenced brands, product names, service names and trademarks
are the property of their respective owners.

19. Contact information

For more information, please visit:

http://www.nxp.com

For sales office addresses, please send an email to:

[email protected]

Document status

[1][2]

Product status

[3]

Definition

Objective [short] data sheet

Development

This document contains data from the objective specification for product development.

Preliminary [short] data sheet

Qualification

This document contains data from the preliminary specification.

Product [short] data sheet

Production

This document contains the product specification.

Summary of Contents for TDA8948J

Page 1: ...put 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...

Page 2: ...therwise 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 volta...

Page 3: ...ple and an amplitude of 300 mV RMS which is applied to the positive supply rail 5 Ordering information 6 Block diagram Table 2 Ordering information Type number Package Name Description Version TDA8948...

Page 4: ...tion Symbol Pin Description OUT1 1 non inverted loudspeaker output of channel 1 GND1 2 ground of channels 1 and 2 VCC1 3 supply voltage channels 1 and 2 OUT2 4 inverted loudspeaker output of channel 2...

Page 5: ...equency response and good switch on behavior 8 2 Power amplifier The power amplifier is a BTL and or SE amplifier with an all NPN output stage capable of delivering a peak output current of 4 A Using...

Page 6: ...VCC 17 V RL 8 and THD 0 1 5 The power dissipation can be derived from Figure 8 SE and BTL for a headroom of 0 dB and 12 dB respectively For heat sink calculation at the average listening level a powe...

Page 7: ...Rejection SVRR is measured with an electrolytic capacitor of 150 F on pin SVR using a bandwidth of 20 Hz to 22 kHz Figure 10 illustrates the SVRR as function of the frequency A larger capacitor value...

Page 8: ...be activated when necessary so even during a short circuit condition a certain amount of pulsed current will still be flowing through the short just as much as the power stage can handle without exce...

Page 9: ...fied Symbol Parameter Conditions Min Typ Max Unit Supply VCC supply voltage operating 1 9 17 26 V no clipping signal 2 28 V Iq quiescent current VCC 17 V RL 3 100 145 mA Istb standby current 10 A Outp...

Page 10: ...y fripple and an amplitude of 300 mV RMS which is applied to the positive supply rail 3 Output voltage in mute mode is measured with VMODE1 VMODE2 7 V and Vi 1 V RMS in a bandwidth from 20 Hz to 22 kH...

Page 11: ...105 104 103 102 10 1 coc005 fi 1 kHz 1 1 SE at THD 10 2 2 SE at THD 10 3 3 SE at THD 10 4 4 SE at THD 10 5 8 SE at THD 10 fi 1 kHz 1 16 BTL at THD 10 2 8 BTL at THD 10 3 6 BTL at THD 10 4 4 BTL at TH...

Page 12: ...TL Fig 6 Total harmonic distortion plus noise as a function of output power 102 10 1 10 1 10 2 mce488 10 1 102 1 10 Po W THD N 102 10 1 10 1 10 2 mce487 10 1 1 THD N 10 Po W 102 VCC 17 V Po 1 W RL 4 V...

Page 13: ...on as a function of channel output power per channel worst case all channels driven 010aaa430 0 20 Po W 20 0 4 8 12 16 4 Ptot W 8 12 16 Po W 0 20 16 8 12 4 010aaa432 8 12 4 16 20 Ptot W 0 VCC 17 V RL...

Page 14: ...V RMS A band pass filter of 20 Hz to 22 kHz has been applied Inputs short circuited VCC 17 V RSOURCE 0 Vripple 300 mV RMS A band pass filter of 20 Hz to 22 kHz has been applied Inputs short circuited...

Page 15: ...F 100 nF 470 nF IN3 IN4 OUT3 OUT4 Vi Vi Vi VCC VCC RL8 22 F 2 2 F 10 k 50 k 270 BC547 BC547 7 5 V micro controller 2 15 GND1 GND2 60 k 60 k 3 8 6 60 k 60 k 9 12 14 17 TDA8948J MUTE 3 4 ON 3 4 010aaa05...

Page 16: ...mended to use Schottky diodes to the supply voltage and ground Fig 12 Application diagram with one pin control and reduction of capacitor VCC1 VCC2 16 220 nF IN1 IN2 OUT1 OUT2 220 nF RL4 RL4 470 F 1 4...

Page 17: ...e rejection The respective capacitor location should be as close as possible to the device and grounded to the power ground Proper power supply decoupling also prevents oscillations For suppressing hi...

Page 18: ...the maximum temperature increase divided by the power dissipation Rth tot Tj max Tamb max P At VCC 17 V and RL 4 4 SE the measured worst case sine wave dissipation is 17 W see Figure 8 For Tj max 150...

Page 19: ...applicable Tamb 25 C external heat sink of 4 3 K W 1 RL 1 2 RL 2 3 RL 3 4 RL 4 5 RL 8 Tamb 25 C external heat sink of 4 3 K W 1 RL 2 2 RL 4 3 RL 6 4 RL 8 5 RL 16 a 4 times various SE loads with music...

Page 20: ...ions Note 1 Plastic or metal protrusions of 0 25 mm maximum per side are not included SOT243 1 0 5 10 mm scale D L E A c A2 L3 Q w M bp 1 d D Z e e x h 1 17 j Eh non concave 99 12 17 03 03 12 DBS17P p...

Page 21: ...older The wave soldering process is suitable for the following Through hole components Leaded or leadless SMDs which are glued to the surface of the printed circuit board Not all SMDs can be wave sold...

Page 22: ...It is imperative that the peak temperature is high enough for the solder to make reliable solder joints a solder paste characteristic In addition the peak temperature must be low enough that the packa...

Page 23: ...rther information on temperature profiles refer to Application Note AN10365 Surface mount reflow soldering description MSL Moisture Sensitivity Level Fig 16 Temperature profiles for large and small co...

Page 24: ...data sheet Rev 01 27 February 2008 24 of 26 NXP Semiconductors TDA8948J 4 channel audio amplifier 17 Revision history Table 14 Revision history Document ID Release date Data sheet status Change notic...

Page 25: ...to result in personal injury death or severe property or environmental damage NXP Semiconductors accepts no liability for inclusion and or use of NXP Semiconductors products in such equipment or appli...

Page 26: ...figuration 5 8 2 Power amplifier 5 8 2 1 Output power measurement 6 8 2 2 Headroom 6 8 3 Mode selection 6 8 4 Supply voltage ripple rejection 7 8 5 Built in protection circuits 8 9 Limiting values 8 1...

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