TDF8599B datasheet(11/54 Pages) NXP

11 / 54 page

TDF8599B_1

Product data sheet

Rev. 01 — 29 July 2009

11 of 54

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.

[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.

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

AD modulation: 1

⁄2 π phase shift in Slave mode

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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