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TDF8599ATH Datasheet(PDF) 11 Page - NXP Semiconductors |
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TDF8599ATH Datasheet(HTML) 11 Page - NXP Semiconductors |
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11 / 54 page  TDF8599A_2 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 02 — 30 June 2009 11 of 54 NXP Semiconductors TDF8599A I2C-bus controlled dual channel class-D power amplifier 8.4 Operation mode selection Pin MOD is used to select specific operating modes. The resistor (RMOD) connected between pins MOD and AGND together with the non-I2C-bus/I2C-bus mode determine the operating mode (see Table 8). The mode of operation depends on whether non-I2C-bus mode or I2C-bus mode is active. This in turn is determined by the resistor value connected between pins ADS and AGND. In non-I2C-bus mode, pin MOD is used to select: • AD or BD modulation (see Section 8.4.1). • 1 ⁄ 2 π phase shift when oscillator is used in Slave mode (see Section 8.4.2). • Parallel mode operation (see Section 8.4.3). In I2C-bus mode, pin MOD can only select Parallel mode. In addition, the modulation mode and phase shift are programmed using I2C-bus commands. [1] RADS ≥ 4.7 kΩ; See Table 13 on page 23. [2] RADS = 0 Ω; pin ADS is short circuited to pin AGND. [3] See Section 8.4.3 on page 14 for more detailed information. In I2C-bus mode, pin MOD is latched using the I2C-bus command IB3[D7] = 1. This avoids amplifier switching interference generating incorrect information on pin MOD. In non-I2C-bus mode or when IB3[D7] = 0, the information on pin MOD is latched when one of the TDF8599A’s outputs starts switching. 8.4.1 Modulation mode In non-I2C-bus mode, pin MOD is used to select either AD or BD modulation mode (see Table 8). In I2C-bus mode, the modulation mode is selected using an I2C-bus command. • AD modulation mode: the bridge halves switch in opposite phase. • BD modulation mode: the bridge halves switch in phase but the input signal for the modulators is inverted. Figure 10 and Figure 11 show simplified representations of AD and BD modulation. Table 8. Operation mode selection with the MOD pin RMOD (kΩ) I2C-bus mode[1] Non-I2C-bus mode[2] 0 (short to AGND) Stereo mode AD modulation: no phase shift in Slave mode 4.7 BD modulation: no phase shift in Slave mode 13 AD modulation: 1 ⁄2 π phase shift in Slave mode 33 Parallel mode[3] BD modulation: 1 ⁄2 π phase shift in Slave mode 100 AD modulation: no phase shift in Slave mode ∞ (open) BD modulation: no phase shift in Slave mode |
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