TFA9881_1104 PHILIPS [NXP Semiconductors], TFA9881_1104 Datasheet - Page 8

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

NXP Semiconductors
Table 9.
All parameters are guaranteed for V
otherwise specified.
[1]
TFA9881
Product data sheet
Symbol
V
oM
R
L
= load resistance; L
Parameter
peak output voltage
Output voltage
8.4.2 Clip control
8.4.3 Gain selection
8.4.4 PWM slope selection
L
Table 7.
[1]
[2]
Table 8.
TFA9881 clip control is off by default. Clip control can be turned on via silence pattern
0xD2 (see
is at maximum with clip control off.
Signal conversion from digital audio in to PWM modulated audio out is independent of
supply voltages V
level is just below the clipping point at a supply voltage of 3.6 V at −6 dBFS (peak) input.
The TFA9881 supports two further gain settings to support full output power at
V
0xD4 and 0xD8 (see
Table 9
settings.
The rise and fall times of the PWM output edges can be set to one of two values, as
detailed in
low’ is selected via silence pattern 0xE1 (see
to reduce Electro-Magnetic Interference (EMI).
Byte
0xE4
0xAA
0x66
0xAC
Bytes 1 to 32 .................... 33 ................................. 127, 128 129
= load inductance.
DDP
The related bytes are the bytes from the first column phase shifted by 1, 2, 3, 4, 5, 6 and 7 bits.
A silence pattern containing this byte will be recognized once the TFA9881 has powered up.
[2]
[2]
= 2.5 V and V
details the corresponding peak output voltage level at −6 dBFS for the three gain
TEST
Conditions
at −6 dBFS (peak) digital input
Table
Silence patterns
Silence pattern recognition
Section
gain = −3 dB, V
gain = 0 dB, V
gain = +3 dB, V
= V
Related bytes
0x72/39/9C/4E/27/93/C9
0x55
0x33/99/CC
0x56/2B/95/CA/65/B2/59
All information provided in this document is subject to legal disclaimers.
10. The default setting is ‘slope normal’ (10 ns with V
DDP
DDP
8.4.1). The TFA9881 clips smoothly with clip control on. Output power
DDP
= 3.6 V; V
Section
and V
= 5.0 V. The gain settings can be selected via silence patterns
Rev. 2 — 1 April 2011
DDP
DDP
DDP
Mute mode (outputs floating)
…continued
[1]
DDD
= 3.6 V, R
8.4.1).
DDD
= 2.5 V, R
= 5.0 V, R
. At the default gain setting (0 dB), the audio output signal
= 1.8 V; L
L
L
L
= 4 Ω; default
= 8 Ω, L
= 4 Ω
L
= 20
Section
Control settings
bandwidth extension on (f
f
defaults; no mute, reset settings to default
Mute mode (no setting); see
Power-down mode; see
3.4 W PDM input class-D audio amplifier
clk
L
μ
= 44 μH
= 64f
H
[1]
, f
8.4.1). This function is implemented
s
); see
clk
= 6.144 MHz, T
control setting activated
[1]
[1]
[1]
Section 8.4.6
Min
-
-
-
Section 8.4.8
Typ
2.3
3.3
4.7
DDP
s
= 32 kHz or
TFA9881
© NXP B.V. 2011. All rights reserved.
amb
Section 8.4.7
= 3.6 V). ‘Slope
= 25
Max
-
-
-
°
C unless
Unit
V
V
V
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