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TDF8599B

I2C-bus controlled dual channel 43 W/4Ω, single channel 85 W/1Ω class-D power amplifier with load diagnostics

NXP Semiconductors. 

NXP Semiconductors

TDF8599B

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.

Table 8. Operation mode selection with the MOD pin

RMOD (kΩ)

I2C-bus mode[1]

0 (short to AGND) Stereo mode

Non-I2C-bus mode[2]

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

[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 TDF8599B’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.

TDF8599B_1

Product data sheet

Rev. 01 — 29 July 2009

© NXP B.V. 2009. All rights reserved.

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