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TDA8933BTW Datasheet(PDF) 11 Page - NXP Semiconductors |
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TDA8933BTW Datasheet(HTML) 11 Page - NXP Semiconductors |
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11 / 42 page  TDA8933B_1 © NXP B.V. 2008. All rights reserved. Preliminary data sheet Rev. 01 — 23 October 2008 11 of 42 NXP Semiconductors TDA8933B Class D audio amplifier 8.5 Diagnostic input and output Except for TF, whenever one of the protections is triggered pin DIAG is activated to LOW level (see Table 6). An internal current source will pull up the open-drain DIAG output to approximately 2.5 V. This current source can deliver approximately 50 µA. The DIAG pin refers to pin CGND. The diagnostic output signal during different short circuit conditions is illustrated in Figure 5. Using pin DIAG as input, a voltage < 0.8 V will put the device into Fault mode. 8.6 Differential inputs For a high common-mode rejection ratio and for maximum flexibility in the application the audio inputs are fully differential. By connecting the inputs anti-parallel the phase of one of the two channels can be inverted so that the amplifier can then operate as a mono BTL amplifier. The input configuration for a mono BTL application is illustrated in Figure 6. In the SE configuration it is also recommended to connect the two differential inputs in anti-phase. This has advantages for the current handling of the power supply at low signal frequencies and minimizes supply pumping (see also Section 14.8). Fig 5. Diagnostic output for different short circuit conditions 001aad759 ≈ 50 ms shorted load amplifier restart no restart ≈ 50 ms 0 V 2.4 V Vo short to supply line 0 V 2.4 V Vo Fig 6. Input configuration for a mono BTL application 001aad760 IN1P OUT1 audio input IN2P IN2N IN1N OUT2 |
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