TFA9881 datasheet(6/32 Pages) PHILIPS

Part #	TFA9881

Description	3.4 W PDM input class-D audio amplifier

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Manufacturer	PHILIPS [NXP Semiconductors]

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TFA9881

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Product data sheet

Rev. 2 — 1 April 2011

6 of 32

NXP Semiconductors

TFA9881

3.4 W PDM input class-D audio amplifier

8.3 Power up/down sequence

The TFA9881 power-up/power-down sequence is shown in Figure 6. External power

supplies VDDP and VDDD should be within their operating limits before the TFA9881

switches to Operating mode. The TFA9881 should be switched to Power-down mode

before the power supplies are disconnected or turned off.

[1]

RL = load resistance; LL = load inductance.

[2]

Inversely proportional to fclk.

Fig 5.

Digital stereo PDM selection

Table 5.

Left/right selection

LRSEL pin state

Description

LOW

left content amplified

HIGH

right content amplified

010aaa702

CLK

DATA

LEFT

RIGHT

Fig 6.

Power-up/power-down sequence

VDDP,

VDDD

CLK

128·fs or 64·fs clock signal

DATA

OUTA,

OUTB

td(on)

Power-down

Operating

Mute

Operating

Mute

Power-down

td(on)

Operating

td(off)

Power-down

switching

PDM

32 times

0x66

floating

0x66 .......

PDM

switching

32 times

0xAC

96 times

0xAC

128

× 0xAC

floating

0xAC .......

PDM

switching

010aaa710

Table 6.

Power-up/power-down timing

All parameters are guaranteed for VTEST =VDDP = 3.6 V; VDDD = 1.8 V; RL =4 Ω[1]; LL =20 μH[1];

fi = 1 kHz; fclk = 6.144 MHz; Tamb = 25 °C; default settings, unless otherwise specified.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

td(on)

turn-on delay time

[2] --

2

ms

td(off)

turn-off delay time

[2] --

5

μs

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