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TDF8599BTH Arkusz danych(PDF) 7 Page - NXP Semiconductors |
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TDF8599BTH Arkusz danych(HTML) 7 Page - NXP Semiconductors |
7 / 54 page TDF8599B_1 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 01 — 29 July 2009 7 of 54 NXP Semiconductors TDF8599B I2C-bus controlled dual channel class-D power amplifier [1] X = do not care. [1] X = do not care. 8.3 Pulse-width modulation frequency The output signal from the amplifier is a PWM signal with a clock 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 (see Figure 5). 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 TDF8599B devices are daisy-chained together in one audio application with a single device providing the clock frequency signal for all 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 TDF8599B in the application is configured as the clock-master. All other TDF8599B devices are configured as clock-slaves (see Figure 5). • The clock-master pin OSCIO is configured as the oscillator output. When a resistor (Rosc) is connected between pins OSCSET and AGND, the TDF8599B 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 TDF8599B is in Slave mode. Table 4. I2C-bus mode operation Pin EN Pin SEL_MUTE Bit IB1[D0] Bit IB2[D0] Mode HIGH (S2 closed) HIGH 1 0 Operating mode LOW 1 1 Mute mode LOW 0 X[1] Standby mode LOW (S2 open) X[1] X[1] X[1] off (default) Table 5. Non-I2C-bus mode operation Pin EN Pin SEL_MUTE Mode HIGH (S2 closed) HIGH (S1 open) Operating mode LOW (S1 closed) Mute mode (default) LOW (S2 open) X[1] off Table 6. Mode setting pin OSCIO Mode Settings Pin OSCSET Pin OSCIO Master Rosc > 26 kΩ output Slave Rosc =0 Ω; shorted to pin AGND input |
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