TFA9881_1104 PHILIPS [NXP Semiconductors], TFA9881_1104 Datasheet - Page 10

• Manufacturer Part Number: TFA9881_1104
• Description: 3.4 W PDM input class-D audio amplifier
• Manufacturer: PHILIPS [NXP Semiconductors]

NXP Semiconductors
TFA9881
Product data sheet
8.4.7 Mute
8.4.8 Power-down
corner frequency where the noise is increasing. The bandwidth in
clock input frequency. This bandwidth can be extended via the bandwidth extension
silence pattern (0xE4; see
the bandwidth extension setting. The bandwidth and the PWM switching frequency when
bandwidth extension is on and off are given in
Remark: The Bandwidth extension should be switched off when f
Table 12.
Mute mode is activated when the mute silence pattern (at least 32 consecutive 0x66
bytes) is applied on the DATA input. The TFA9881 remains in Mute mode as long as the
0x66 pattern is repeated. It will return to Operating mode when a pattern other than 0x66
is received. Transitions to and from Mute mode occur as soon as the relevant pattern is
recognized by the TFA9881 (hard mute and hard unmute).
Power-down mode is activated when the power-down silence pattern (at least 128
consecutive 0xAC bytes) is applied on the DATA input. The TFA9881 remains in
Power-down mode as long as the 0xAC pattern is repeated. It will return to Operating
mode when a pattern other than 0xAC is received.
Setting
bandwidth extension on
bandwidth extension off; default setting
Fig 8.
Output power spectrum, f
Bandwidth extension setting
All information provided in this document is subject to legal disclaimers.
(dBFS)
output
−120
−160
−40
−80
Rev. 2 — 1 April 2011
10
Section
10
clk
2
8.4.1). The PWM switching frequency also scales with
= 6.144 MHz
10
Bandwidth
3
-------- -
128
f
-------- -
256
f
clk
clk
3.4 W PDM input class-D audio amplifier
Table
10
4
12.
10
010aaa709
5
f (Hz)
Switching frequency
10
f
------- -
6
16
f
------- -
clk
clk
8
Figure 8
clk
> 4.1 MHz.
TFA9881
© NXP B.V. 2011. All rights reserved.
scales with the
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