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TDA8944AJ Datasheet(PDF) 4 Page - NXP Semiconductors |
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TDA8944AJ Datasheet(HTML) 4 Page - NXP Semiconductors |
4 / 20 page Philips Semiconductors TDA8944AJ 2 x 7 W BTL audio amplifier with DC gain control Product data Rev. 01 — 01 March 2002 4 of 20 9397 750 09433 © Koninklijke Philips Electronics N.V. 2002. All rights reserved. 8. Functional description The TDA8944AJ is a stereo BTL audio power amplifier capable of delivering 2 × 7W 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. GC 13 DC gain control OUT2 − 14 negative loudspeaker terminal 2 GND2 15 ground channel 2 VCC2 16 supply voltage channel 2 OUT2 + 17 positive loudspeaker terminal 2 Table 3: Pin description…continued Symbol Pin Description Fig 3. Asymmetrical input configuration. handbook, halfpage MGW589 power ground signal ground signal source IN + IN − SVR VCC |
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