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TDA8933BTW Datasheet(PDF) 7 Page - NXP Semiconductors |
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TDA8933BTW Datasheet(HTML) 7 Page - NXP Semiconductors |
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7 / 42 page  TDA8933B_1 © NXP B.V. 2008. All rights reserved. Preliminary data sheet Rev. 01 — 23 October 2008 7 of 42 NXP Semiconductors TDA8933B Class D audio amplifier 8.3 Pulse Width Modulation (PWM) frequency The output signal of the amplifier is a PWM signal with a carrier frequency of approximately 320 kHz. Using a 2nd-order low-pass filter in the application results in an analog audio signal across the loudspeaker. The PWM switching frequency can be set by an external resistor Rosc connected between pin OSCREF and VSSD(HW). The carrier frequency can be set between 300 kHz and 500 kHz. Using an external resistor of 39 k Ω, the carrier frequency is set to a typical value of 320 kHz (see Figure 4). If two or more TDA8933B devices are used in the same audio application, it is recommended to synchronize the switching frequency of all devices. See Section 14.6 for more information. The value of the resistor also sets the frequency of the carrier and can be calculated with Equation 1: (1) Where: fosc = oscillator frequency (Hz) Fig 3. Start-up sequence VP POWERUP DREF HVPREF HVP1, HVP2 ENGAGE 2.0 V (typical) 1.2 V (typical) PWM OUT1, OUT2 DIAG OSCIO 010aaa457 operating operating PWM PWM sleep mute operating fault AUDIO AUDIO AUDIO ≤ 0.8 V f osc 12.45x10 9 R osc ------------------------- = |
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