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TFA9812_2 © NXP B.V. 2009. All rights reserved.
Preliminary data sheet Rev. 02 — 22 January 2009 57 of 66
NXP Semiconductors
TFA9812
BTL stereo Class-D audio amplifier with I
2
S input
a. V
P
= 12 V; R
L
= 2 × 6 Ω; P
o
= 1 W b. V
P
= 12 V; R
L
= 2 × 8 Ω; P
o
= 1 W
Fig 18. Total harmonic distortion-plus-noise as a function of frequency
010aaa484
1
10
−1
10
THD+N
(%)
10
−2
f (Hz)
10 10
5
10
4
10
2
10
3
010aaa485
1
10
−1
10
THD+N
(%)
10
−2
f (Hz)
10 10
5
10
4
10
2
10
3
V
P
= 12 V; P
O
= 1 W
(1) R
L
= 6 Ω 15 µH / 680 µF
(2) R
L
= 8 Ω 15 µH / 680 µF
V
P
= 12 V; R
L
= 8 Ω; f
i
= 1 kHz
(1) 0 dB
(2) 24 dB gain boost
Fig 19. Gain as a function of frequency Fig 20. Gain as a function of AVOL
010aaa486
−1
1
3
G
(dB)
−3
f (Hz)
10 10
5
10
4
10
2
10
3
(1)
(2)
AVOL (V)
03210.5 1.5 2.5
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−80
−100
−60
−20
−40
0
G
(dB)
−120
(1)(2)