NXP Semiconductors TFA9879, Руководство пользователя

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NXP Semiconductors
UM10340_5
TFA9879 demonstration PCB
© NXP B.V. 2011. All rights reserved.
User manual Rev. 05 — 30 aug. 2011 11 of 20
3. Performance characterization TFA9879HN
Table below shows the measured performance figures of the TFA9879HN demonstration
PCB. Digital I2S input signal is applied to connector X4 and the audio analyzer is
connected via an AUX-0025 passive filter from Audio Precision to the PWM outputs
(OUTA, OUTB).
V
P
= 3.7 V, 8
Ω
+ 44
µ
H, f
i
= 1 kHz, I2S format, f
S
= 48kHz, T
amb
= 25
°
C unless specified
otherwise.
Table 2. Performance figures
Symbol Parameters Conditions / Notes Min Typ Max Unit
V
p
Supply voltage 2.5
1
5.5
1
V
P
o
RMS output power Clip control on
3
(off
4
)
R
L
= 8
Ω;
V
p
= 3.7 V
THD+N = 10 % 760 (870) mW
THD+N = 1 % 590 (720) mW
R
L
= 8
Ω;
V
p
= 4.2 V
THD+N = 10 % 970 (1120) mW
THD+N = 1 % 770 (940) mW
R
L
= 8
Ω
; V
p
= 5.0 V
THD+N = 10% 1.4 (1.6) W
THD+N = 1% 1.1(1.3) W
R
L
= 4
Ω
; V
p
= 3.7 V
THD+N = 10% 1.3 (1.5) W
THD+N = 1% 1.0 (1.2) W
R
L
= 4
Ω
; V
p
= 4.2 V
THD+N = 10% 1.7 (2.0) W
THD+N = 1% 1.3 (1.6) W
R
L
= 4
Ω
; V
p
= 5.0 V
THD+N = 10% 2.4 (2.7) W
THD+N = 1% 1.9 (2.2) W
THD+N Total Harmonic Distortion
and Noise
R
L
= 8
Ω
; P
o
= 100 mW, AES17 brick wall filter 20 kHz
0.015 %
R
L
= 4
Ω
, P
o
= 100 mW, AES17 brick wall filter 20 kHz
0.025 %
η
Efficiency TFA9879
4
V
p
= 3.7V, R
l
= 4
Ω
, P
o
= 1.3W
V
p
= 3.7V, R
l
= 8
Ω
, P
o
= 0.76W
88
92 %
%
V
p
= 5V, R
l
= 4
Ω
, P
o
= 2.4W
V
p
= 5V, R
l
= 8
Ω
, P
o
= 1.4W
88
91 %
%
SEN Input Sensitivity P
O
= 100 mW, Volume 0dB -13 dBFS
V
n(o)
Noise output voltage V
p
= 5 V, Soft mute, A-weighted 58
µ
V
S/N Signal to Noise ratio A-weighted w.r.t. V
o
= 3.5 V
RMS
-95 dB
BW Band Width +/- 1 dB @ Po = 100mW 10…20.000 Hz
PSRR Power Supply Rejection
Ratio Vripple = 200mVrms, f = 217Hz, no input signal -76 dB