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PDF TFA9895 Data sheet ( Hoja de datos )
| Número de pieza | TFA9895 | |
| Descripción | Boosted class-D audio amplifier | |
| Fabricantes | NXP Semiconductors | |
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TFA9895
Boosted class-D audio amplifier with speaker boost
protection and multiband dynamic range compressor
Rev. 1 — 23 October 2013
Product short data sheet
1. General description
The TFA9895 is a high efficiency class-D audio amplifier with a sophisticated speaker
boost protection algorithm that features multi-band compression. It can deliver 2.65 W
(RMS; THD = 1 %) output power into a 4 speaker at a battery voltage of 3.6 V. The
internal boost converter raises the supply voltage to 5.3 V, providing ample headroom for
major improvements in sound quality.
A safe working environment is provided for the speaker under all operating conditions.
The TFA9895 maximizes acoustic output while ensuring diaphragm displacement and
voice coil temperature do not exceed their rated limits. This function is based on a
speaker box model that operates in all loudspeaker environments (e.g. free air, closed box
or vented box). Furthermore, advanced signal processing ensures that the quality of the
audio signal is never degraded by unwanted clipping or distortion in the amplifier or
speaker.
Unlike competing solutions, the adaptive sound maximizer algorithm uses feedback to
accurately calculate both the temperature and the excursion, allowing the TFA9895 to
adapt to changes in the acoustic environment.
Internal intelligent DC-to-DC conversion boosts the supply rail to provide additional
headroom and power output. The supply voltage is only raised when necessary. This
precaution maximizes the output power of the class-D audio amplifier while limiting
quiescent power consumption.
The multi-band processing improves audio quality and apparent volume by allowing the
gain to remain stable in most of the signal while the protection reacts to only those
portions that would be unsafe. The TFA9895 also adds a high-frequency noise gate that
improves the sound of poor-quality audio sources.
The TFA9895 also incorporates advanced battery protection. By limiting the supply
current when the battery voltage is low, it prevents the audio system drawing excessive
load currents from the battery, which could cause a system undervoltage. The advanced
processor minimizes the impact of a falling battery voltage on the audio quality by
preventing distortion as the battery discharges.
The device features low RF susceptibility because it has a digital input interface that is
insensitive to clock jitter. The second order closed loop architecture used in a class-D
audio amplifier provides excellent audio performance and high supply voltage ripple
rejection. The audio input interface is I2S and the control settings are communicated via
an I2C-bus interface.
The TFA9895 is available in a 29-bump WLCSP (Wafer Level Chip-Size Package) with a
400 m pitch.
1 page  
NXP Semiconductors
TFA9895
Boosted class-D audio amplifier with speaker boost protection
7. Pinning information
7.1 Pinning
123 4567
E
D
C
B
A
bump A1
index area
a. Bottom view
Fig 2. Bump configuration
010aaa734
bump A1
index area
123
4567
A
B
C
D
E
b. Transparent top view
010aaa735
1234
A DATAI2 DATAO DATAI1 DATAI3
B WS2 WS1
TEST3
C BCK2 BCK1
TEST4
D n.c.
SCL
TEST5
E n.c. SDA VDDD GNDD
5
ADS1
VBAT
Transparent top view
Fig 3. Bump mapping
6
ADS2
7
OUTB
VDDP
TEST1
GNDP
OUTA
TEST2 GNDB
BST
INB
010aaa736
TFA9895_SDS
Product short data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 23 October 2013
© NXP B.V. 2013. All rights reserved.
5 of 21
5 Page 
NXP Semiconductors
TFA9895
Boosted class-D audio amplifier with speaker boost protection
11.2 AC characteristics
Table 7. AC characteristics
All parameters are guaranteed for VBAT = 3.6 V; VDDD = 1.8 V; VDDP = VBST = 5.3 V; LBST = 1 H[1]; RL = 4 [1]; LL = 20 H[1];
fi = 1 kHz; fs = 48 kHz; Tamb = 25 C; default settings, unless otherwise specified.
Symbol Parameter
Conditions
Min Typ Max Unit
Amplifier output power
Po(RMS) RMS output power
THD+N = 1 %; CLIP = 00
RL = 4 ; fs = 48 kHz
RL = 4 ; fs = 32 kHz
RL = 8 ; fs = 48 kHz
RL = 8 ; fs = 32 kHz
THD+N = 1 %; CLIP = 10
-
2.55 -
W
-
2.65 -
W
-
1.5 -
W
-
1.65 -
W
RL = 4 ; fs = 48 kHz
RL = 4 ; fs = 32 kHz
RL = 8 ; fs = 48 kHz
RL = 8 ; fs = 32 kHz
THD+N = 10 %; CLIP = 00
-
2.35 -
W
-
2.55 -
W
-
1.25 -
W
-
1.4 -
W
Amplifier output; pins OUTA and OUTB
RL = 4 ; fs = 48 kHz
RL = 4 ; fs = 32 kHz
RL = 8 ; fs = 48 kHz
RL = 8 ; fs = 32 kHz
-
3.75 -
W
-
3.75 -
W
- 2-W
- 2-W
VO(offset) output offset voltage
Amplifier performance
absolute value
- - 1 mV
po output power efficiency
including DC-to-DC converter; Po(RMS) [2] -
= 2.65 W;
80 -
%
THD+N
Vn(o)
total harmonic distortion-plus-noise Po(RMS) = 100 mW; RL = 8 ;
LL = 44 H
output noise voltage
A-weighted; DATAI1 = DATAI2 = 0 V
CoolFlux DSP disabled and
bypassed
[2] -
-
0.03 0.1 %
31 -
V
CoolFlux DSP enabled
[2] -
45 -
V
S/N signal-to-noise ratio
VO = 4.5 V (peak); A-weighted
CoolFlux DSP disabled and
bypassed
-
100 -
dB
CoolFlux DSP enabled
[2] -
97 -
dB
PSRR
power supply rejection ratio
Vripple = 200 mV (RMS); fripple = 217 Hz
Amplifier power-up, power-down and propagation delays
-
90 -
dB
td(on)
turn-on delay time
PLL locked on BCK (IPLL = 0)
fs = 8 kHz to 48 kHz
PLL locked on WS (IPLL = 1)
- - 2 ms
td(off)
turn-off delay time
fs = 8 kHz
fs = 48 kHz
- - 27 ms
- - 6 ms
- - 10 s
TFA9895_SDS
Product short data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 23 October 2013
© NXP B.V. 2013. All rights reserved.
11 of 21
11 Page | ||
| Páginas | Total 21 Páginas | |
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