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TDF8599

I2C-bus controlled dual channel 43 W/2Ωsingle channel 85 W/1Ω class-D power amplifier with load diagnostics

NXP Semiconductors. 

NXP Semiconductors

TDF8599

Class-D power amplifier with load diagnostics

Table 4. I2C-bus mode operation

Pin EN

Bit IB1[D0]

S2 closed

1

1

0

S2 open

X[1]

[1] X = do not care

Bit IB2[D0]

0

1

X[1]

X[1]

Mode

Operating mode

Mute mode

Standby mode

off

Table 5. Non-I2C-bus mode operation

Pin EN

Bit IB2[D0]

S2 closed

S1 open

S2 closed

S2 open

do not care

Mode

Operating mode

Mute mode

off

8.3 Pulse-width modulation frequency

The output signal from the amplifier is a PWM signal with a switching 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 kΩ, for example, sets the clock frequency to 320 kHz. 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 TDF8599 devices are daisy-chained together

in one audio application with a single device providing the clock frequency signal for the

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 TDF8599 in the application is configured

as the clock-master. All other TDF8599 devices are configured as clock-slaves (see

Figure 6).

• The clock-master pin OSCIO is configured as the oscillator output. When a resistor

(Rosc) is connected between pins OSCSET and AGND, the TDF8599 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 TDF8599 is in Slave

mode.

Table 6.

Mode

Master

Slave

Mode setting OSCIO

Settings

Pin OSCSET

Rosc > 26 kΩ

Rosc = 0 kΩ; shorted to AGND

Pin OSCIO

output

input

TDF8599_1

Product data sheet

Rev. 01 — 13 November 2008

© NXP B.V. 2008. All rights reserved.

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