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TDA8944AJ
2 x 7 W BTL audio amplifier with DC gain control
Rev. 01 -- 01 March 2002
M3D541
Product data
1. General description
The TDA8944AJ is a dual-channel audio power amplifier with DC gain control. It has an output power of 2 x 7 W at an 8 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 overall gain can be adjusted from +30 dB down to -50 dB using a DC control voltage. This feature can be used for volume control or a preset gain. The TDA8944AJ comes in a 17-pin DIL-bent-SIL (DBS) power package and is pin compatible with the TDA8944J.
2. Features
s s s s s s s s s s Gain/volume adjustment via a DC control pin Soft clipping Operating at a low supply voltage 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 with TDA8946AJ and TDA8580J.
3. Applications
s Mains fed applications (e.g. TV sound) s PC audio s Portable audio.
4. Quick reference data
Table 1: VCC Iq Istb Po THD Quick reference data Conditions VCC = 12 V; RL = THD = 10%; RL = 8 ; VCC = 12 V Po = 1 W Min 4.5 6 Typ 12 40 7 0.07 Max 18 50 10 0.5 Unit V mA A W % supply voltage quiescent supply current standby supply current output power total harmonic distortion Symbol Parameter
Philips Semiconductors
TDA8944AJ
2 x 7 W BTL audio amplifier with DC gain control
Quick reference data...continued Conditions Min 29 Typ 30 80 55 Max 31 Unit dB dB dB maximum voltage gain voltage gain control range supply voltage ripple rejection
Table 1: Gv(max) Gv(cr) SVRR
Symbol Parameter
5. Ordering information
Table 2: Ordering information Package Name TDA8944AJ DBS17P Description Version plastic DIL-bent-SIL power package; 17 leads (lead SOT243-1 length 12 mm) Type number
6. Block diagram
idth
VCC1 3
VCC2 16
1 IN1- IN1+ 8 6 4
OUT1-
OUT1+
GC
13
TDA8944AJ
14 OUT2-
IN2- IN2+
9 12 17 VCC
OUT2+
MODE SVR
10 11
STANDBY/ MUTE LOGIC
20 k
20 k 7 SGND 2 GND1
SHORT CIRCUIT AND TEMPERATURE PROTECTION 15
MGW587
GND2
Fig 1. Block diagram.
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Product data
Rev. 01 -- 01 March 2002
2 of 20
Philips Semiconductors
TDA8944AJ
2 x 7 W BTL audio amplifier with DC gain control
7. Pinning information
7.1 Pinning
handbook, halfpage
OUT1- GND1 VCC1 OUT1+ n.c. IN1+ SGND IN1- IN2-
1 2 3 4 5 6 7 8 9
TDA8944AJ
MODE 10 SVR 11 IN2+ 12 GC 13 OUT2- 14 GND2 15 VCC2 16 OUT2+ 17
MGW588
Fig 2. Pin configuration.
7.2 Pin description
Table 3: Symbol OUT1- GND1 VCC1 OUT1+ n.c. IN1+ SGND IN1- IN2- MODE SVR IN2+
9397 750 09433
Pin description Pin 1 2 3 4 5 6 7 8 9 10 11 12 Description negative loudspeaker terminal 1 ground channel 1 supply voltage channel 1 positive loudspeaker terminal 1 not connected positive input 1 signal ground negative input 1 negative input 2 mode selection input (standby, mute, operating) half supply voltage decoupling (ripple rejection) positive input 2
(c) Koninklijke Philips Electronics N.V. 2002. All rights reserved.
Product data
Rev. 01 -- 01 March 2002
3 of 20
Philips Semiconductors
TDA8944AJ
2 x 7 W BTL audio amplifier with DC gain control
Pin description...continued Pin 13 14 15 16 17 Description DC gain control negative loudspeaker terminal 2 ground channel 2 supply voltage channel 2 positive loudspeaker terminal 2
Table 3: Symbol GC OUT2- GND2 VCC2 OUT2+
8. Functional description
The TDA8944AJ is a stereo BTL audio power amplifier capable of delivering 2 x 7 W output power to an 8 load at THD = 10%, using a 12 V power supply and an external heatsink. The gain of both amplifiers can be adjusted through a DC control voltage (pin GC). This feature can be used for volume control or a preset gain. With the three-level MODE input the device can be switched from `standby' to `mute' and to `operating' mode. The TDA8944AJ outputs are protected by an internal thermal shutdown protection mechanism and a short-circuit protection.
8.1 Input configuration
The TDA8944AJ inputs can be driven symmetrical (floating) as well as asymmetrical. In the asymmetrical mode one input pin is connected via a capacitor to the signal source and the other input is connected to the signal ground. This signal ground 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 coupling capacitors for both pins are necessary.
handbook, halfpage
VCC
IN + IN - SVR signal ground power ground
signal source
MGW589
Fig 3. Asymmetrical input configuration.
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Product data
Rev. 01 -- 01 March 2002
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Philips Semiconductors
TDA8944AJ
2 x 7 W BTL audio amplifier with DC gain control
The input cut-off frequency is: 1 f i ( cut - off ) = -----------------------------------------2 ( 0.5 x R i x C i ) For Ri = 32 k and Ci = 220 nF: 1 f i ( cut - off ) = ------------------------------------------------------------------------------ = 45.2 Hz 3 -9 2 ( 0.5 x 32 x 10 x 220 x 10 )
(1)
(2)
As shown in Equation 2, large capacitors values for the inputs are not necessary; so the switch-on delay during charging of the input capacitors can be minimized. This results in a good low frequency response and good switch-on behaviour. Remark: To prevent high frequency oscillations do not leave the inputs open, connect a capacitor of 4.7 nF across the input pins close to the device (see Figure 15).
8.2 Power amplifier
The power amplifier is a Bridge-Tied Load (BTL) amplifier with an all-NPN output stage, capable of delivering a peak output current of 2 A. The BTL principle offers the following advantages:
* * * *
8.2.1
Lower peak value of the supply current The ripple frequency on the supply voltage is twice the signal frequency No expensive DC-blocking capacitor Good low frequency performance.
Output power measurement The output power as a function of the supply voltage is measured on the output pins at THD = 10%; see Figure 10. The maximum output power is limited by the supply voltage of 12 V and the maximum available output current: 2 A repetitive peak current.
8.2.2
Headroom Typical CD music requires at least 12 dB (factor 15.85) dynamic headroom compared to the average power output - for transferring the loudest parts without distortion. At VCC = 12 V, RL = 8 and Po = 4 W at THD = 0.2% (see Figure 8), the Average Listening Level (ALL) - music power - without any distortion yields: 4W P o ( ALL ) = ------------- = 252.4 mW 15.85 The power dissipation can be derived from Figure 12 on page 11 for 0 dB respectively 12 dB headroom.
(3)
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Product data
Rev. 01 -- 01 March 2002
5 of 20
Philips Semiconductors
TDA8944AJ
2 x 7 W BTL audio amplifier with DC gain control
Power rating as function of headroom Power output (THD = 0.2%) Po = 4 W Po(ALL) = 252.4 mW Power dissipation P = 7.8 W P = 4.0 W
Table 4: Headroom 0 dB 12 dB
For the average listening level a power dissipation of 4 W can be used for a heatsink calculation.
8.3 Mode selection
The TDA8944AJ has three functional modes, which can be selected by applying the proper DC voltage to pin MODE. Standby -- In this mode the current consumption is very low and the outputs are floating. The device is in standby mode when VMODE > (VCC - 0.5 V), or when the MODE pin is left floating. Mute -- In this mode the amplifier is DC-biased but not operational (no audio output). This allows the input coupling capacitors to be charged to avoid pop-noise. The device is in mute mode when 3.5 V < VMODE < (VCC - 1.5 V). Operating -- In this mode the amplifier is operating normally. The operating mode is activated at VMODE < 1.0 V. 8.3.1 Switch-on and switch-off To avoid audible plops during supply voltage switch-on or switch-off, the device is set to standby mode before the supply voltage is applied (switch-on) or removed (switch-off). The switch-on and switch-off time can be influenced by an RC-circuit on the MODE pin. Rapid on/off switching of the device or the rapid switching of the MODE pin may cause `click-and pop-noise'. This can be prevented by proper timing of the RC-circuit on the MODE pin.
8.4 DC gain control
The gain of both amplifiers can be adjusted (logarithmic) by applying an external DC voltage source on pin GC (see Figure 6). The DC voltage source range is 0.5 to 4.0 V. This feature can be used for volume control or a preset gain. The maximum voltage gain is set at +30 dB and the control range is more than 80 dB, so the minimal gain is less than -50 dB. When pin GC is not connected, the gain is set at +24 dB.
8.5 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 14 illustrates the SVRR as function of the frequency. A larger capacitor value on the SVR pin improves the ripple rejection behavior at the lower frequencies.
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Product data
Rev. 01 -- 01 March 2002
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Philips Semiconductors
TDA8944AJ
2 x 7 W BTL audio amplifier with DC gain control
8.6 Built-in protection circuits
The TDA8944AJ contains two types of protection circuits, i.e. short-circuit and thermal shutdown. 8.6.1 Short-circuit protection Short-circuit to ground or supply line -- This is detected by a so-called `missing current' detection circuit which measures the current in the positive supply line and the current in the ground line. A difference between both currents larger than 0.8 A, switches the power stage to the standby mode; high impedance of the outputs and very low supply current. Short-circuit across the load -- This is detected by an absolute-current measurement. An absolute-current larger than 2 A, switches the power stage to standby mode; high impedance of the outputs and a very low supply current. 8.6.2 Thermal shutdown protection The junction temperature is measured by a temperature sensor; at a junction temperature of approximately 150 C this detection circuit switches the power stage to the standby mode; high impedance of the outputs and very low supply current.
9. Limiting values
Table 5: Limiting values In accordance with the Absolute Maximum Rating System (IEC 60134). Symbol VCC VI IORM Tstg Tamb Ptot VCC(sc) Parameter supply voltage input voltage repetitive peak output current storage temperature operating ambient temperature total power dissipation supply voltage to guarantee short-circuit protection non-operating Conditions no signal operating Min -0.3 -0.3 -0.3 -55 -40 Max +25 +18 VCC + 0.3 2 +150 +85 18 15 Unit V V V A C C W V
10. Thermal characteristics
Table 6: Symbol Rth(j-a) Rth(j-mb) Thermal characteristics Parameter thermal resistance from junction to ambient Conditions in free air Value 40 4.5 Unit K/W K/W
thermal resistance from junction to mounting base both channels driven
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Product data
Rev. 01 -- 01 March 2002
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Philips Semiconductors
TDA8944AJ
2 x 7 W BTL audio amplifier with DC gain control
11. Static characteristics
Table 7: Static characteristics VCC = 12 V; Tamb = 25 C; RL = 8 ; VMODE = 0 V; Vi = 0 V; measured in test circuit Figure 15; unless otherwise specified. Symbol VCC Iq Istb VO VOUT[3] VMODE Parameter supply voltage quiescent supply current standby supply current DC output voltage differential output voltage offset mode selection input voltage operating mode mute mode standby mode IMODE VGC IGC
[1] [2] [3]
Conditions operating RL = VMODE = VCC
[2] [1]
Min 4.5 0 3.5 VCC - 0.5 -
Typ 12 40 6 2.75 600
Max 18 50 10 170 1.0 VCC - 1.5 VCC 20 -
Unit V mA A V mV V V V A V A
mode selection input current 0 < VMODE < VCC gain control voltage (pin GC) pin GC not connected current into pin GC VGC = 0 V
With a load connected at the outputs the quiescent current will increase, the maximum of this increase being equal to the differential output voltage offset (VOUT) divided by the load resistance (RL). The DC output voltage with respect to ground is approximately 0.5VCC. VOUT = VOUT+ - VOUT- .
MGW590
MGW591
handbook, halfpage
50
Iq (mA)
handbook, halfpage
50
Iq (mA)
40
40
30
30
20
20
10
10
0 0 4 8 12 16 20 VCC (V)
0 0 4 8 12 16 20 VMODE (V)
VCC = 12 V
Fig 4. Quiescent current as function of supply voltage.
Fig 5. Quiescent current as function of mode voltage.
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Product data
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TDA8944AJ
2 x 7 W BTL audio amplifier with DC gain control
12. Dynamic characteristics
Table 8: Dynamic characteristics VCC = 12 V; Tamb = 25 C; RL = 8 ; f = 1 kHz; VMODE = 0 V; Gv = 30 dB; VGC = 4.0 V; measured in test circuit Figure 15; unless otherwise specified. Symbol Po THD Gv(max) Gv(cr) Vi(rms) Zi(dif) Vn(o) SVRR Vo(mute) cs |Gv|
[1] [2] [3]
Parameter output power total harmonic distortion maximum voltage gain gain control range input voltage (RMS value) differential input impedance noise output voltage supply voltage ripple rejection output voltage channel separation channel unbalance
Conditions THD = 10% THD = 0.5% Po = 1 W 0.5 < VGC < 4.0 V Gv = 0 dB; THD <1% VGC = 4.0 V VGC = 1.0 V fripple = 1 kHz fripple = 100 Hz to 20 kHz mute mode Rsource = 0 Gv = 0 dB; VGC = 1.8 V
[1] [1] [2] [2] [3]
Min 6 29 1.0 50 50 -
Typ 7 5 0.07 30 80 65 120 30 55 55 30 75 -
Max 0.5 31 150 50 1
Unit W W % dB dB V k V V dB dB V dB dB
The noise output voltage is measured at the output in a frequency range from 20 Hz to 20 kHz (unweighted), with a source impedance Rsource = 0 at the input. Supply voltage ripple rejection is measured at the output, with a source impedance Rsource = 0 at the input. The ripple voltage is a sine wave with a frequency fripple and an amplitude of 700 mV (RMS), which is applied to the positive supply rail. Output voltage in mute mode is measured with VGC = 0 V and an input voltage of 1 V (RMS) in a bandwidth of 20 kHz, thus including noise.
MGW592
handbook, halfpage G
40 v (dB) 20
handbook, halfpage
10
MGW593
Vo (V)
1 10-1 10-2 10-3 10-4 10-5 0 4 8 VMODE (V) 12
0
-20 -40 -60 -80
0
1
2
3 VGC (V)
4
VCC = 12 V
Vi = 30 mV; VCC = 12 V
Fig 6. Voltage gain as function of control voltage.
Fig 7. Output voltage as function of mode voltage.
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Product data
Rev. 01 -- 01 March 2002
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Philips Semiconductors
TDA8944AJ
2 x 7 W BTL audio amplifier with DC gain control
102 handbook, halfpage THD (%) 10
MGW594
MGW595
handbook, halfpage
10
THD (%) 1
(1)
1
(2)
10-1 10-1
10-2 10-2
10-1
1
10
Po (W)
102
10-2 10 102 103 104 f (Hz) 105
VCC = 12 V
VCC = 12 V; no bandpass filter applied (1) Po = 0.1 W (2) Po = 1 W
Fig 8. Total harmonic distortion as function of output power.
16
MGW596
Fig 9. Total harmonic distortion as function of frequency.
MGW597
handbook, halfpage
handbook, halfpage
20
Po (W) 12
(2) (1)
Ptot (W)
16
12 8 8 4 4
0 0 4 8 12 16 20 VCC (V)
0 0 4 8 12 16 20 VCC (V)
RL = 8 (1) THD = 10% (2) THD = 1%
RL = 8
Fig 10. Output power as function of supply voltage.
Fig 11. Total power dissipation (worst-case) as function of supply voltage.
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Product data
Rev. 01 -- 01 March 2002
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TDA8944AJ
2 x 7 W BTL audio amplifier with DC gain control
MGW598
handbook, halfpage
10 P (W) 8
handbook, halfpage
0
MGW599
cs (dB)
-20
6
-40
4
-60
2
-80
0 0 2 4 6 8 Po (W) 10
-100 10
102
103
104
f (Hz)
105
VCC = 12 V; RL = 8
VCC = 12 V; no bandpass filter applied
Fig 12. Power dissipation as function of output power.
0
Fig 13. Channel separation as function of frequency.
MGW600
handbook, halfpage
SVRR (Hz) -20
-40
B A
-60
-80
-100 10
102
103
104
f (Hz)
105
VCC = 12 V; Rsource = 0 ; Vripple = 707 mV (RMS); a bandpass filter of 10 Hz to 80 kHz has been applied. Curve A: inputs short-circuited Curve B: inputs short-circuited and connected to ground.
Fig 14. Supply voltage ripple rejection as function of frequency.
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2 x 7 W BTL audio amplifier with DC gain control
13. Internal circuitry
Table 9: Pin 6 and 8 12 and 9 Internal circuitry Symbol IN1+ and IN1- IN2+ and IN2-
handbook, halfpage
Equivalent circuit
VCC
VCC
3 k
3 k
VCC
8, 9 32 k 32 k
6, 12
1/2 VCC (SVR)
MGW601
1 and 4 14 and 17
OUT1- and OUT1+ OUT2- and OUT2+
handbook, halfpage
VCC
600 1, 4, 14, 17 100 1/2 VCC
MGW602
10
MODE
handbook, halfpage
VCC
VCC
VCC
1 k
1 k
10 OFF HIGH MUTE HIGH
MGW603
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Product data
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TDA8944AJ
2 x 7 W BTL audio amplifier with DC gain control
Internal circuitry...continued Symbol SVR
handbook, halfpage
Table 9: Pin 11
Equivalent circuit
VCC Standby
VCC 17.6 k 11 17.6 k
MGW604
13
GC
handbook, halfpage
VCC
1:1
13 5.65 k 2.5 k
736
2.75 V
MGW605
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Product data
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TDA8944AJ
2 x 7 W BTL audio amplifier with DC gain control
14. Application information
VCC VCC1 3 Rsource 220 nF Vi IN1- 8 4.7 nF IN1+ 6 4 OUT1+ 220 nF VCC2 16 OUT1- RL 220 nF 4 4 100 nF 1000 F
handbook, full pagewidth
1
220 nF (1)
8
or
Rsource 220 nF Vi
GC 13
TDA8944AJ
14 OUT2- RL 17 VCC OUT2+ 220 nF 4 220 nF 4
IN2- 9 4.7 nF
220 nF (1) IN2+ 12
8
MODE 10 MICROCONTROLLER SVR 11
STANDBY/ MUTE LOGIC
20 k
20 k 10 F 7 SGND 2
SHORT CIRCUIT AND TEMPERATURE PROTECTION 15 GND2
MGW606
GND1
(1) To prevent high frequency oscillations do not leave the inputs open, connect a capacitor of 4.7 nF across the input pins close to the device.
Fig 15. Application diagram.
14.1 Printed-circuit board
14.1.1 Layout and grounding For a high system performance level certain grounding techniques are essential. The input reference grounds have to be tied with their respective source grounds and must have separate tracks from the power ground tracks; this will prevent the large (output) signal currents from interfering 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 for delivering maximum output power.
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Product data
Rev. 01 -- 01 March 2002
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Philips Semiconductors
TDA8944AJ
2 x 7 W BTL audio amplifier with DC gain control
4
OUT2-
220 nF ON MODE 10 F SVR
220 nF
OUT2+
4
1 220 nF 4.7 nF 4.7 nF 220 nF 1 220 nF 100 nF 4 1000 F
IN2+ IN2-
GC
SGND IN1- IN1+
OUT1-
220 nF
VCC
OUT1+
4
GND
MGW607
Fig 16. Printed-circuit board layout (single-sided); components view.
14.1.2
Power supply decoupling Proper supply bypassing is critical for low-noise performance and high supply voltage ripple 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 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 frequency noise and ripple signals, a large electrolytic capacitor - e.g. 1000 F or greater - must be placed close to the device. The bypass capacitor on the SVR pin reduces the noise and ripple on the midrail voltage. For good THD and noise performance a low ESR capacitor is recommended.
14.2 Thermal behaviour and heatsink calculation
The measured maximum thermal resistance of the IC package, Rth(j-mb) is 4.5 K/W. A calculation for the heatsink can be made, with the following parameters: Tamb = 50 C VCC = 12 V and RL = 8 Tj(max) = 150 C Rth(tot) is the total thermal resistance between the junction and the ambient including the heatsink. In the heatsink calculations the value of Rth(mb-h) is ignored.
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Product data
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TDA8944AJ
2 x 7 W BTL audio amplifier with DC gain control
At VCC = 12 V and RL = 8 the measured worst-case sine-wave dissipation is 8 W; see Figure 12. For Tj(max) = 150 C the temperature rise - caused by the power dissipation - is: 150 - 50 = 100 C. P x Rth(tot) = 100 C Rth(tot) = 100/8 = 12.5 K/W Rth(h-a) = Rth(tot) - Rth(j-mb) = 12.5 - 4.5 = 8.0 K/W. The calculation above is for an application at worst-case (stereo) sine-wave output signals. In practice music signals will be applied, which decreases the maximum power dissipation to approximately half of the sine-wave power dissipation (see Section 8.2.2). This allows for the use of a smaller heatsink: P x Rth(tot) = 100 C Rth(tot) = 100/(0.5 x 8) = 25 K/W Rth(h-a) = Rth(tot) - Rth(j-mb) = 25 - 4.5 = 20.5 K/W. To increase the lifetime of the IC, Tj(max) should be reduced to 125 C. This requires a heatsink of approximately 14 K/W for music signals.
15. Test information
15.1 Quality information
The "General Quality Specification for Integrated Circuits, SNW-FQ-611D" is applicable (ordering code 9397 750 05459). 15.1.1 Test conditions Tamb = 25 C; VCC = 12 V; f = 1 kHz; RL = 8 ; audio pass band 22 Hz to 22 kHz; unless otherwise specified. Remark: In the graphs as function of frequency no bandpass filter was applied; see Figure 9 and 13.
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Product data
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TDA8944AJ
2 x 7 W BTL audio amplifier with DC gain control
16. Package outline
DBS17P: plastic DIL-bent-SIL power package; 17 leads (lead length 12 mm) SOT243-1
non-concave D x Dh
Eh
view B: mounting base side
d
A2
B j E A
L3
L
Q c vM
1 Z e e1 bp wM
17 m e2
0
5 scale
10 mm
DIMENSIONS (mm are the original dimensions) UNIT mm A 17.0 15.5 A2 4.6 4.4 bp 0.75 0.60 c 0.48 0.38 D (1) 24.0 23.6 d 20.0 19.6 Dh 10 E (1) 12.2 11.8 e 2.54 e1 e2 Eh 6 j 3.4 3.1 L 12.4 11.0 L3 2.4 1.6 m 4.3 Q 2.1 1.8 v 0.8 w 0.4 x 0.03 Z (1) 2.00 1.45
1.27 5.08
Note 1. Plastic or metal protrusions of 0.25 mm maximum per side are not included. OUTLINE VERSION SOT243-1 REFERENCES IEC JEDEC EIAJ EUROPEAN PROJECTION
ISSUE DATE 97-12-16 99-12-17
Fig 17. DBS17P package outline.
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Product data
Rev. 01 -- 01 March 2002
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Philips Semiconductors
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2 x 7 W BTL audio amplifier with DC gain control
17. Soldering
17.1 Introduction to soldering through-hole mount packages
This text gives a brief insight to wave, dip and manual soldering. A more in-depth account of soldering ICs can be found in our Data Handbook IC26; Integrated Circuit Packages (document order number 9398 652 90011). Wave soldering is the preferred method for mounting of through-hole mount IC packages on a printed-circuit board.
17.2 Soldering by dipping or by solder wave
The maximum permissible temperature of the solder is 260 C; solder at this temperature must not be in contact with the joints for more than 5 seconds. The total contact time of successive solder waves 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-circuit board has been pre-heated, forced cooling may be necessary immediately after soldering to keep the temperature within the permissible limit.
17.3 Manual soldering
Apply the soldering iron (24 V or less) to the lead(s) of the package, either below the seating plane or not more than 2 mm above it. If the temperature of the soldering iron bit is less than 300 C it may remain in contact for up to 10 seconds. If the bit temperature is between 300 and 400 C, contact may be up to 5 seconds.
17.4 Package related soldering information
Table 10: Package DBS, DIP, HDIP, SDIP, SIL
[1]
Suitability of through-hole mount IC packages for dipping and wave soldering methods Soldering method Dipping suitable Wave suitable[1]
For SDIP packages, the longitudinal axis must be parallel to the transport direction of the printed-circuit board.
18. Revision history
Table 11: Rev Date 01 20020301 Revision history CPCN Description Product data (9397 750 09433)
9397 750 09433
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Product data
Rev. 01 -- 01 March 2002
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2 x 7 W BTL audio amplifier with DC gain control
19. Data sheet status
Data sheet status[1] Objective data Preliminary data Product status[2] Development Qualification Definition This data sheet contains data from the objective specification for product development. Philips Semiconductors reserves the right to change the specification in any manner without notice. This data sheet contains data from the preliminary specification. Supplementary data will be published at a later date. Philips Semiconductors reserves the right to change the specification without notice, in order to improve the design and supply the best possible product. This data sheet contains data from the product specification. Philips Semiconductors reserves the right to make changes at any time in order to improve the design, manufacturing and supply. Changes will be communicated according to the Customer Product/Process Change Notification (CPCN) procedure SNW-SQ-650A.
Product data
Production
[1] [2]
Please consult the most recently issued data sheet before initiating or completing a design. The product status of the device(s) described in this data sheet may have changed since this data sheet was published. The latest information is available on the Internet at URL http://www.semiconductors.philips.com.
20. Definitions
Short-form specification -- The data in a short-form specification is extracted from a full data sheet with the same type number and title. For detailed information see the relevant data sheet or data handbook. Limiting values definition -- Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 60134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability. Application information -- Applications that are described herein for any of these products are for illustrative purposes only. Philips Semiconductors make no representation or warranty that such applications will be suitable for the specified use without further testing or modification.
21. Disclaimers
Life support -- These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips Semiconductors customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from such application. Right to make changes -- Philips Semiconductors reserves the right to make changes, without notice, in the products, including circuits, standard cells, and/or software, described or contained herein in order to improve design and/or performance. Philips Semiconductors assumes no responsibility or liability for the use of any of these products, conveys no licence or title under any patent, copyright, or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless otherwise specified.
Contact information
For additional information, please visit http://www.semiconductors.philips.com. For sales office addresses, send e-mail to: sales.addresses@www.semiconductors.philips.com.
9397 750 09433
Fax: +31 40 27 24825
(c) Koninklijke Philips Electronics N.V. 2002. All rights reserved.
Product data
Rev. 01 -- 01 March 2002
19 of 20
Philips Semiconductors
TDA8944AJ
2 x 7 W BTL audio amplifier with DC gain control
Contents
1 2 3 4 5 6 7 7.1 7.2 8 8.1 8.2 8.2.1 8.2.2 8.3 8.3.1 8.4 8.5 8.6 8.6.1 8.6.2 9 10 11 12 13 14 14.1 14.1.1 14.1.2 14.2 15 15.1 15.1.1 16 17 17.1 17.2 17.3 17.4 18 19 20 21 General description . . . . . . . . . . . . . . . . . . . . . . 1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Quick reference data . . . . . . . . . . . . . . . . . . . . . 1 Ordering information . . . . . . . . . . . . . . . . . . . . . 2 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Pinning information . . . . . . . . . . . . . . . . . . . . . . 3 Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 3 Functional description . . . . . . . . . . . . . . . . . . . 4 Input configuration . . . . . . . . . . . . . . . . . . . . . . 4 Power amplifier . . . . . . . . . . . . . . . . . . . . . . . . . 5 Output power measurement . . . . . . . . . . . . . . . 5 Headroom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Mode selection . . . . . . . . . . . . . . . . . . . . . . . . . 6 Switch-on and switch-off. . . . . . . . . . . . . . . . . . 6 DC gain control . . . . . . . . . . . . . . . . . . . . . . . . . 6 Supply Voltage Ripple Rejection (SVRR) . . . . . 6 Built-in protection circuits . . . . . . . . . . . . . . . . . 7 Short-circuit protection . . . . . . . . . . . . . . . . . . . 7 Thermal shutdown protection . . . . . . . . . . . . . . 7 Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . . 7 Thermal characteristics. . . . . . . . . . . . . . . . . . . 7 Static characteristics. . . . . . . . . . . . . . . . . . . . . 8 Dynamic characteristics . . . . . . . . . . . . . . . . . . 9 Internal circuitry. . . . . . . . . . . . . . . . . . . . . . . . 12 Application information. . . . . . . . . . . . . . . . . . 14 Printed-circuit board . . . . . . . . . . . . . . . . . . . . 14 Layout and grounding . . . . . . . . . . . . . . . . . . . 14 Power supply decoupling . . . . . . . . . . . . . . . . 15 Thermal behaviour and heatsink calculation . 15 Test information . . . . . . . . . . . . . . . . . . . . . . . . 16 Quality information . . . . . . . . . . . . . . . . . . . . . 16 Test conditions . . . . . . . . . . . . . . . . . . . . . . . . 16 Package outline . . . . . . . . . . . . . . . . . . . . . . . . 17 Soldering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Introduction to soldering through-hole mount packages . . . . . . . . . . . . . . . . . . . . . . 18 Soldering by dipping or by solder wave . . . . . 18 Manual soldering . . . . . . . . . . . . . . . . . . . . . . 18 Package related soldering information . . . . . . 18 Revision history . . . . . . . . . . . . . . . . . . . . . . . . 18 Data sheet status . . . . . . . . . . . . . . . . . . . . . . . 19 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
(c) Koninklijke Philips Electronics N.V. 2002. Printed in The Netherlands
All rights are reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license under patent- or other industrial or intellectual property rights. Date of release: 01 March 2002 Document order number: 9397 750 09433

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