NXP Semiconductors TDA8944J Specification Sheet Download Page 12

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NXP Semiconductors

TDA8944J

2 x 7 W stereo BTL audio amplifier

Product specification

Rev. 02 — 14 February 2000

12 of 22

9397 750 06861

13. Internal circuitry

Table 9:

Internal circuitry

Pin

Symbol

Equivalent circuit

6 and 8 IN1+ and IN1

−

12 and 9

IN2+ and IN2

−

1 and 4

OUT1

−

and OUT1+

14 and 17

OUT2

−

and OUT2+

MODE

SVR

1.5 k

45 k

VCC

MGL946

1 : 1

1/2 VCC

(SVR)

8, 9

6, 12

100

MGL947

1, 4, 14, 17

1/2 VCC

1 k

10 k

OFF

HIGH

MUTE

HIGH

1 k

VCC

MGL949

Standby

20 k

VCC

MGL948

Summary of Contents for TDA8944J

Page 1: ...e with all other types in the TDA894x family One PCB footprint accommodates both the mono and the stereo products 2 Features Few external components Fixed gain Standby and mute mode No on off switchin...

Page 2: ...33 dB SVRR supply voltage ripple rejection 50 65 dB Table 1 Quick reference data continued Symbol Parameter Conditions Min Typ Max Unit Table 2 Ordering information Type number Package Name Descripti...

Page 3: ...4 15 16 17 OUT1 GND1 VCC1 OUT1 n c IN1 n c IN1 IN2 MODE SVR IN2 n c OUT2 GND2 VCC2 OUT2 Table 3 Pin description Symbol Pin Description OUT1 1 negative loudspeaker terminal 1 GND1 2 ground channel 1 VC...

Page 4: ...ed via a capacitor to the signal ground which should be as close as possible to the SVR electrolytic capacitor ground Note that the DC level of the input pins is half of the supply voltage VCC so coup...

Page 5: ...utput for transferring the loudest parts without distortion At VCC 12 V RL 8 and Po 4 W at THD 0 1 see Figure 6 the Average Listening Level ALL music power without any distortion yields Po ALL 4 W 15...

Page 6: ...he RC circuit on the MODE pin 8 4 Supply Voltage Ripple Rejection SVRR The SVRR is measured with an electrolytic capacitor of 10 F on pin SVR at a bandwidth of 10 Hz to 80 kHz Figure 13 on page 11 ill...

Page 7: ...rrent 2 A Tstg storage temperature non operating 55 150 C Tamb operating ambient temperature 40 85 C Ptot total power dissipation 18 W VCC sc supply voltage to guarantee short circuit protection 15 V...

Page 8: ...f 20 kHz so including noise Fig 3 Quiescent current as function of supply voltage Fig 4 Quiescent current as function of mode voltage handbook halfpage 50 40 30 20 10 0 0 4 8 12 16 VCC V Iq mA 20 MGL9...

Page 9: ...tage No bandpass filter applied Fig 6 Total harmonic distortion as function of output power Fig 7 Total harmonic distortion as function of frequency handbook full pagewidth 20 16 VMODE V 12 MGL957 8 4...

Page 10: ...r dissipation as function of supply voltage VCC 12 V Fig 10 Efficiency as function of output power Fig 11 Power dissipation as function of output power handbook halfpage 20 16 12 8 4 0 0 4 8 12 16 VCC...

Page 11: ...tion of frequency VCC 12 V Rs 0 Vripple 707 mV peak to peak no bandpass filter applied Curves A inputs short circuited Curves B inputs short circuited and connected to ground asymmetrical application...

Page 12: ...nternal circuitry Table 9 Internal circuitry Pin Symbol Equivalent circuit 6 and 8 IN1 and IN1 12 and 9 IN2 and IN2 1 and 4 OUT1 and OUT1 14 and 17 OUT2 and OUT2 10 MODE 11 SVR 1 5 k 1 5 k 45 k 45 k V...

Page 13: ...ng with the small AC input signals The small signal ground tracks should be physically located as far as possible from the power ground tracks Supply and output tracks should be as wide as possible fo...

Page 14: ...illations For suppressing higher frequency transients spikes on the supply line a capacitor with low ESR typical 100 nF has to be placed as close as possible to the device For suppressing lower freque...

Page 15: ...100 C P Rth tot 100 C Rth tot 100 8 12 5 K W Rth h a Rth tot Rth j mb 12 5 6 9 5 6 K W The calculation above is for an application at worstcase stereo sine wave output signals In practice music signa...

Page 16: ...ensions 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 DBS17...

Page 17: ...s must not exceed 5 seconds The device may be mounted up to the seating plane but the temperature of the plastic body must not exceed the specified maximum storage temperature Tstg max If the printed...

Page 18: ...ged to VCC 0 5 V VMODE VCC The power consumption of the TDA8944J will be reduced to 0 18 mW added Mute mode the DC level of the input and output pins remain on half the supply voltage added 2 5 V VMOD...

Page 19: ...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...

Page 20: ...ducts in automotive equipment or applications In the event that customer uses the product for design in and use in automotive applications to automotive specifications and standards customer a shall u...

Page 21: ...og Power Management Interface Security and Digital Processing expertise Customer notification This data sheet was changed to reflect the new company name NXP Semiconductors including new legal definit...

Page 22: ...7 2 Pin description 3 8 Functional description 4 8 1 Input configuration 4 8 2 Power amplifier 5 8 2 1 Output power measurement 5 8 2 2 Headroom 5 8 3 Mode selection 5 8 3 1 Switch on and switch off...

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