TDF8599TH datasheet(12/52 Pages) NXP

12 / 52 page

TDF8599_1

Product data sheet

Rev. 01 — 13 November 2008

12 of 52

NXP Semiconductors

TDF8599

Class-D power ampliﬁer with load diagnostics

In non-I2C-bus mode pin MOD is used to select:

1. AD or BD modulation type (see Section 8.4.1).

2. 1

⁄

2 π phase shift when oscillator is used in Slave mode (see Section 8.4.2).

3. Parallel mode operation (see Section 8.4.3).

In I2C-bus mode, pin MOD can only select Parallel mode. In addition, the modulation type

and phase shift are programmed using I2C-bus commands.

The information on pin MOD is latched when one of the TDF8599 outputs starts switching

to avoid incorrect information on pin MOD caused by disturbances of switching ampliﬁer

outputs.

8.4.1 Modulation mode

In non-I2C-bus mode, pin MOD is used to select either AD or BD modulation mode. 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, Figure 11 and Figure 12 show simpliﬁed representations of AD and BD

modulation.

Table 8.

Operation mode selection with the MOD pin

RMOD (kΩ)

I2C-bus mode

Non-I2C-bus mode

0 (short to GND) 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

BD modulation: 1

⁄

2 π phase shift in Slave mode

100

Parallel mode

AD modulation: no phase shift in Slave mode

∞ (open)

BD modulation: no phase shift in Slave mode

Fig 10. AD/BD modulation switching circuit

001aai778

+VP

OUTP

INxP

INxN

OUTN

+VP

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