Table of Contents
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1. General description
2. Features
c
c
3. Applications
4. Quick reference data
TDA8944J
2 x 7 W stereo Bridge Tied Load (BTL) audio amplifier
Rev. 02 — 14 February 2000
The TDA8944J is a dual-channel audio power amplifier with an output power of
2 × 7 W at an 8 Ω load and a 12 V supply. The circuit contains two Bridge Tied Load
(BTL) amplifiers with an all-NPN output stage and standby/mute logic. The TDA8944J
comes in a 17-pin DIL-bent-SIL (DBS) power package. The TDA8944J is
printed-circuit board (PCB) compatible with all other types in the TDA894x family.
One PCB footprint accommodates both the mono and the stereo products.
Few external components
Fixed gain
Standby and mute mode
No on/off switching plops
Low standby current
High supply voltage ripple rejection
Outputs short-circuit protected to ground, supply and across the load
Thermally protected
Printed-circuit board compatible.
Mains fed applications (e.g. TV sound)
PC audio
Portable audio.
Table 1:
Quick reference data
Symbol Parameter
V
supply voltage
CC
I
quiescent supply current
q
I
standby supply current
stb
Conditions
= ∞
V
= 12 V; R
CC
L
Product specification
Min
Typ
Max
Unit
6
12
18
V
-
24
36
mA
μA
-
-
10
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Summary of Contents for NXP Semiconductors TDA8944J
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Page 1: General Description
1. General description The TDA8944J is a dual-channel audio power amplifier with an output power of 2 × 7 W at an 8 Ω load and a 12 V supply. The circuit contains two Bridge Tied Load (BTL) amplifiers with an all-NPN output stage and standby/mute logic. The TDA8944J comes in a 17-pin DIL-bent-SIL (DBS) power package. -
Page 2: Ordering Information
NXP Semiconductors Table 1: Symbol Parameter SVRR 5. Ordering information Table 2: Type number Package TDA8944J 6. Block diagram width Fig 1. Block diagram. 9397 750 06861 Product specification Quick reference data …continued Conditions output power THD = 10%; R... -
Page 3: Table Of Contents
IN2− MODE IN2+ 9397 750 06861 Product specification handbook, halfpage OUT1 GND1 V CC1 OUT1 n.c. n.c. TDA8944J MODE n.c. OUT2 GND2 V CC2 OUT2 Pin description Description negative loudspeaker terminal 1 ground channel 1 supply voltage channel 1 positive loudspeaker terminal 1... -
Page 4: Gnd1
OUT2+ 8. Functional description The TDA8944J is a stereo BTL audio power amplifier capable of delivering 2 × 7 W output power to an 8 Ω load at THD = 10%, using a 12 V power supply and an external heatsink. The voltage gain is fixed at 32 dB. -
Page 5: Power Amplifier
8.3 Mode selection The TDA8944J has three functional modes, which can be selected by applying the proper DC voltage to pin MODE. See which depend on the supply voltage level. The MODE pin can be driven by a 3-state logic output stage: e.g. -
Page 6: Out1
A larger capacitor value on the SVR pin improves the ripple rejection behaviour at the lower frequencies. 8.5 Built-in protection circuits The TDA8944J contains two types of protection circuits, i.e. short-circuit and thermal shutdown. 8.5.1 Short-circuit protection Short-circuit to ground or supply line —... -
Page 7: Limiting Values
= ∞ MODE operating mode mute mode standby mode 0 < V < V MODE Rev. 02 — 14 February 2000 TDA8944J 2 x 7 W stereo BTL audio amplifier −0.3 −0.3 −0.3 + 0.3 −55 +150 −40 Value Figure 14;... -
Page 8: Dynamic Characteristics
= 100 Hz ripple to 20 kHz mute mode = 0 Ω Rev. 02 — 14 February 2000 TDA8944J 2 x 7 W stereo BTL audio amplifier (mA) V CC = 12 V Figure 14; audio pass band 0.03 = 0 Ω... - Page 9 No bandpass filter applied. Fig 7. Total harmonic distortion as function of frequency. Rev. 02 — 14 February 2000 TDA8944J 2 x 7 W stereo BTL audio amplifier V MODE (V) P o = 0.1 W © NXP B.V. 2010. All rights reserved.
- Page 10 MGL962 handbook, halfpage P o (W) Fig 11. Power dissipation as function of output power. Rev. 02 — 14 February 2000 TDA8944J 2 x 7 W stereo BTL audio amplifier P tot R L = 8 voltage. R L = 8...
- Page 11 Fig 13. Supply voltage ripple rejection as function of frequency. 9397 750 06861 Product specification handbook, halfpage (dB) Rev. 02 — 14 February 2000 TDA8944J 2 x 7 W stereo BTL audio amplifier MGL958 f (Hz) f (Hz) MGL956 © NXP B.V. 2010. All rights reserved.
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Page 12: Mode
IN1+ and IN1− IN2+ and IN2− 8, 9 OUT1− and OUT1+ OUT2− and OUT2+ MODE Rev. 02 — 14 February 2000 TDA8944J 2 x 7 W stereo BTL audio amplifier V CC V CC 1.5 k 1.5 k 45 k... -
Page 13: Application Information
Supply and output tracks should be as wide as possible for delivering maximum output power. 9397 750 06861 Product specification 220 nF 45 k 1/2 V CC 220 nF 45 k 220 nF TDA8944J 220 nF 45 k 1/2 V CC 45 k V CC MODE STANDBY/ MUTE LOGIC signal Rev. -
Page 14: Power Supply Decoupling
220 nF 1.5 nF 220 nF OUT1 100 nF OUT1 Rev. 02 — 14 February 2000 TDA8944J 2 x 7 W stereo BTL audio amplifier 56 mm MUTE V CC 1000 F MGL951 © NXP B.V. 2010. All rights reserved. -
Page 15: Thermal Behaviour And Heatsink Calculation
= 25 °C; V = 12 V; f = 1 kHz; R and 13. Rev. 02 — 14 February 2000 TDA8944J 2 x 7 W stereo BTL audio amplifier should be reduced to 125 °C. This requires a j(max) = 8 Ω; audio pass band 22 Hz to 22 kHz;... -
Page 16: Out2
20.0 12.2 2.54 1.27 5.08 19.6 11.8 REFERENCES JEDEC JEITA Rev. 02 — 14 February 2000 TDA8944J 2 x 7 W stereo BTL audio amplifier non-concave view B: mounting base side 10 mm 12.4 11.0 EUROPEAN PROJECTION SOT243-1 2.00 0.03 1.45... -
Page 17: Soldering
For SDIP packages, the longitudinal axis must be parallel to the transport direction of the printed-circuit board. For PMFP packages hot bar soldering or manual soldering is suitable. Rev. 02 — 14 February 2000 TDA8944J 2 x 7 W stereo BTL audio amplifier Soldering method Dipping... -
Page 18: Revision History
18. Revision history Table 11: Revision history Rev Date CPCN Description 000214 - Product specification; second version; supersedes initial version TDA8944J-01 of 14 April 1999 (9397 750 04881). Modifications: • Table 1 on page • Figure 1 on page •... -
Page 19: Out2
Limiting values and Characteristics sections of this document, and as such is not complete, exhaustive or legally binding. Rev. 02 — 14 February 2000 TDA8944J 2 x 7 W stereo BTL audio amplifier using Semiconductors customer’s... - Page 20 NXP Semiconductors’ standard warranty and NXP Semiconductors’ product specifications. Rev. 02 — 14 February 2000 TDA8944J 2 x 7 W stereo BTL audio amplifier © NXP B.V. 2010 All rights reserved. 20 of 22...
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Page 21: Contact Information
For sales office addresses, please send an email to: 9397 750 06861 Product specification http://www.nxp.com salesaddresses@nxp.com Rev. 02 — 14 February 2000 TDA8944J 2 x 7 W stereo BTL audio amplifier © NXP B.V. 2010. All rights reserved. 21 of 22... - Page 22 Date of release: 14 February 2000 Document order number: 9397 750 06861 Printed in The Netherlands TDA8944J 2 x 7 W stereo BTL audio amplifier...
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