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TDA8932B Datasheet(PDF) 7 Page - NXP Semiconductors |
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TDA8932B Datasheet(HTML) 7 Page - NXP Semiconductors |
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7 / 48 page  TDA8932B_4 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 04 — 18 December 2008 7 of 48 NXP Semiconductors TDA8932B Class-D audio amplifier 8.3 Pulse width modulation frequency The output 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 pins 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 an optimized value of 320 kHz (see Figure 5). If two or more TDA8932B devices are used in the same audio application, it is recommended to synchronize the switching frequency of all devices. This can be realized by connecting all OSCIO pins together and configure one of the TDA8932B in the application as clock master, while the other TDA8932B devices are configured in slave mode. Pin OSCIO is a 3-state input or output buffer. Pin OSCIO is configured in master mode as an oscillator output and in slave mode as an oscillator input. Master mode is enabled by applying a resistor while slave mode is entered by connecting pin OSCREF directly to pin VSSD(HW) (without any resistor). The value of the resistor also sets the frequency of the carrier which can be estimated by the following formula: Fig 4. Start-up sequence VP POWERUP DREF HVPREF HVP1, HVP2 ENGAGE 2.0 V (typical) 1.2 V (typical) audio PWM OUT1, OUT2 DIAG OSCIO 001aaf885 operating operating PWM PWM sleep mute operating fault AUDIO AUDIO AUDIO ≤ 0.8 V |
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