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PDF TDA8942P Data sheet ( Hoja de datos )
| Número de pieza | TDA8942P | |
| Descripción | 2 x 1.5 W stereo Bridge Tied Load BTL audio amplifier | |
| Fabricantes | NXP Semiconductors | |
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TDA8942P
2 x 1.5 W stereo Bridge Tied Load (BTL) audio amplifier
Rev. 02 — 14 March 2000
Product specification
1. General description
The TDA8942P is a dual-channel audio power amplifier for an output power of
2 × 1.5 W at a 16 Ω load and a 9 V supply. The circuit contains two Bridge Tied Load
(BTL) amplifiers with an all-NPN output stage and standby/mute logic.
The TDA8942P comes in a 16-pin dual in-line (DIP) package.The TDA8942P 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.
2. Features
c
c
s Few external components
s Fixed gain
s Standby and mute mode
s No on/off switching plops
s Low standby current
s High supply voltage ripple rejection
s Outputs short-circuit protected to ground, supply and across the load
s Thermally protected
s Printed-circuit board compatible.
3. Applications
s Mains fed applications (e.g. TV sound)
s PC audio
s Portable audio.
4. Quick reference data
Table 1: Quick reference data
Symbol Parameter
VCC supply voltage
Iq quiescent supply current
Istb standby supply current
Conditions
VCC = 12 V; RL = ∞
Min Typ Max Unit
6 9 18 V
- 22 32 mA
- - 10 µA
1 page  
Philips Semiconductors
TDA8942P
2 x 1.5 W stereo BTL audio amplifier
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:
• 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.
8.2.1 Output power measurement
The output power as a function of the supply voltage is measured on the output pins
at THD = 10%; see Figure 8. The maximum output power is limited by the maximum
power dissipation in the plastic dual in-line (DIP16) package.See also Section 14.2 on
page 16.
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 = 9 V, RL = 16 Ω and Po = 1 W at THD = 1% (see Figure 6a), the
Average Listening Level (ALL) – music power – without any distortion yields:
Po(ALL) = 1 W/15.85 = 63 mW.
The power dissipation can be derived from Figure 11 on page 11 for 0 dB
respectively 12 dB headroom.
Table 4: Power rating as function of headroom
Headroom
Power output (THD = 0.1%)
0 dB
12 dB
Po = 1 W
Po(ALL) = 63 mW
Power dissipation (P)
2.35 W
1.15 W
For the average listening level a power dissipation of 1.15 W can be used for
calculation of the maximum ambient temperature Tamb(max) (see Section 14.2).
8.3 Mode selection
The TDA8942P has three functional modes, which can be selected by applying the
proper DC voltage to pin MODE. See Figure 4 and 5 for the respective DC levels,
which depend on the supply voltage level. The MODE pin can be driven by a 3-state
logic output stage: e.g. a microcontroller with additional components for DC-level
shifting.
Standby — In this mode the current consumption is very low and the outputs are
floating. The device is in standby mode when (VCC − 0.5 V) < VMODE < VCC, or when
the MODE pin is left floating (high impedance). The power consumption of the
TDA8942P will be reduced to <0.18 mW.
9397 750 06862
Product specification
Rev. 02 — 14 March 2000
© Philips Electronics N.V. 2000. All rights reserved.
5 of 23
5 Page 
Philips Semiconductors
TDA8942P
2 x 1.5 W stereo BTL audio amplifier
100
handbook, halfpage
η
(%)
80
60
40
MGL998
(1)
(2)
20
0
0 0.5 1 1.5 2 2.5
Po (W)
(1) VCC = 9 V.
(2) VCC = 11 V.
Fig 10. Efficiency as function of output power.
0
handbooαkc, hsalfpage
(dB)
−20
3
handbookP, halfpage
(W)
2.5
2
MGL997
(1)
(2)
1.5
1
0.5
0
0 0.5 1 1.5 2 2.5
Po (W)
(1) VCC = 9 V; RL = 16 Ω.
(2) VCC = 11 V; RL = 25 Ω.
Fig 11. Power dissipation as function of output power.
MGL994
−40
−60
−80
−100
10
102 103
No bandpass filter applied.
Fig 12. Channel separation as function of frequency.
104 105
f (Hz)
9397 750 06862
Product specification
Rev. 02 — 14 March 2000
© Philips Electronics N.V. 2000. All rights reserved.
11 of 23
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