TDA8944AJ 데이터 시트보기 (PDF) - NXP Semiconductors.
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TDA8944AJ Datasheet PDF : 20 Pages
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Philips Semiconductors
TDA8944AJ
2 x 7 W BTL audio amplifier with DC gain control
Table 3:
Symbol
GC
OUT2−
GND2
VCC2
OUT2+
Pin description…continued
Pin
Description
13
DC gain control
14
negative loudspeaker terminal 2
15
ground channel 2
16
supply voltage channel 2
17
positive loudspeaker terminal 2
8. Functional description
The TDA8944AJ 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 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
signal
source
VCC
IN +
IN −
SVR
signal
ground
power
ground
Fig 3. Asymmetrical input configuration.
MGW589
9397 750 09433
Product data
Rev. 01 — 01 March 2002
© Koninklijke Philips Electronics N.V. 2002. All rights reserved.
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