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TDF8599TH Datasheet(PDF) 8 Page - NXP Semiconductors |
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TDF8599TH Datasheet(HTML) 8 Page - NXP Semiconductors |
8 / 52 page TDF8599_1 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 01 — 13 November 2008 8 of 52 NXP Semiconductors TDF8599 Class-D power amplifier with load diagnostics [1] X = do not care 8.3 Pulse-width modulation frequency The output signal from the amplifier is a PWM signal with a switching frequency of fosc. This frequency is set by connecting a resistor (Rosc) between pins OSCSET and AGND. The optimal clock frequency setting is between 300 kHz and 400 kHz. Connecting a resistor with a value of 39 k Ω, for example, sets the clock frequency to 320 kHz. The external capacitor (Cosc) has no influence on the oscillator frequency. It does however, reduce jitter and sensitivity to disturbance. Using a 2nd order LC demodulation filter in the application generates an analog audio signal across the loudspeaker. 8.3.1 Master and slave mode selection In a master and slave configuration, multiple TDF8599 devices are daisy-chained together in one audio application with a single device providing the clock frequency signal for the other devices. In this situation, it is recommended that the oscillators of all devices are synchronized for optimum EMI behavior as follows: All OSCIO pins are connected together and one TDF8599 in the application is configured as the clock-master. All other TDF8599 devices are configured as clock-slaves (see Figure 6). • The clock-master pin OSCIO is configured as the oscillator output. When a resistor (Rosc) is connected between pins OSCSET and AGND, the TDF8599 is in Master mode. • The clock-slave pins OSCIO are configured as the oscillator inputs. When pin OSCSET is directly connected to pin AGND (see Table 6), the TDF8599 is in Slave mode. Table 4. I2C-bus mode operation Pin EN Bit IB1[D0] Bit IB2[D0] Mode S2 closed 1 0 Operating mode 1 1 Mute mode 0X[1] Standby mode S2 open X[1] X[1] off Table 5. Non-I2C-bus mode operation Pin EN Bit IB2[D0] Mode S2 closed S1 open Operating mode S2 closed Mute mode S2 open do not care off Table 6. Mode setting OSCIO Mode Settings Pin OSCSET Pin OSCIO Master Rosc > 26 kΩ output Slave Rosc =0kΩ; shorted to AGND input |
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