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| TFA9881_1104 Datasheet, PDF (16/32 Pages) NXP Semiconductors – 3.4 W PDM input class-D audio amplifier | |||
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NXP Semiconductors
TFA9881
3.4 W PDM input class-D audio amplifier
12.2 AC characteristics
Table 17. AC characteristics
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
Output power
Po(RMS) RMS output power
THD + N = 1 %
VDDP = 3.6 V, fi = 100 Hz
VDDP = 5.0 V, fi = 100 Hz
THD + N = 1 %; RL = 8 Ω; LL = 44 μH
VDDP = 3.6 V, fi = 100 Hz
VDDP = 5.0 V, fi = 100 Hz
THD + N = 10 %
-
1.4 -
W
-
2.7 -
W
-
0.75 -
W
-
1.45 -
W
Performance
VDDP = 3.6 V, fi = 100 Hz
VDDP = 5.0 V, fi = 100 Hz
THD + N = 10 %; RL = 8 Ω; LL = 44 μH
VDDP = 3.6 V, fi = 100 Hz
VDDP = 5.0 V, fi = 100 Hz
-
1.75 -
W
-
3.4 -
W
-
0.95 -
W
-
1.85 -
W
ηpo
output power efficiency
Po(RMS) = 1.4 W
THD+N total harmonic distortion-plus-noise Po(RMS) = 100 mW
Vn(o)
output noise voltage
A-weighted
S/N
signal-to-noise ratio
VDDP = 5 V; Vo = 3.4 V (RMS); A-weighted
PSRR
power supply rejection ratio
Vripple = 200 mV; fripple = 217 Hz
VoM
peak output voltage
At â6 dBFS (peak) digital input
gain = â3 dB; VDDP = 3.6 V
RL = 4 Ω; LL = 20 μH
gain = 0 dB; VDDP = 3.6 V
RL = 4 Ω; LL = 20 μH
gain = +3 dB; VDDP = 5.0 V
RL = 8 Ω; LL = 44 μH
Power-up, power-down and propagation times
-
90 -
%
-
0.02 0.1 %
-
24 -
μV
-
103 -
dB
-
85 -
dB
-
2.3 -
V
3.1 3.3 3.5 V
-
4.7 -
V
td(on)
td(off)
tPD
turn-on delay time
turn-off delay time
propagation delay
[2] -
-
[2] -
-
[2] -
-
2
ms
5
μs
55 μs
[1] RL = load resistance; LL = load inductance.
[2] Inversely proportional to fclk.
TFA9881
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 â 1 April 2011
© NXP B.V. 2011. All rights reserved.
16 of 32
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