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PDF TFA9887 Data sheet ( Hoja de datos )
| Número de pieza | TFA9887 | |
| Descripción | Audio system | |
| Fabricantes | NXP Semiconductors | |
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TFA9887
Audio system with adaptive sound maximizer and speaker
protection
Rev. 1 — 11 July 2012
Product short data sheet
1. General description
The TFA9887 is an audio system consisting of a high efficiency class-D audio amplifier,
and embedded DSP with a sophisticated speaker-boost and protection algorithm and an
intelligent DC-to-DC converter. It can safely deliver 2.65 W (RMS; THD = 1 %) output
power into a 4 speaker that is nominally only rated for 0.5 W. The integrated intelligent
DC-to-DC converter allows the system to deliver this power from a battery voltage of
3.6 V. The audio input interface is I2S and the control settings are communicated via an
I2C-bus interface.
The TFA9887 guarantees safe speaker operation under all operating conditions. It
maximizes acoustic output while ensuring diaphragm displacement and voice coil
temperature do not exceed rated limits. The processing is capable of providing a
significant improvement in sound volume and quality, while also ensuring reliable
operation. This function is based on and adaptive model that operates in all loudspeaker
environments (e.g. free air, closed box or vented box). Furthermore, advanced signal
processing ensures the quality of the audio signal is always optimized.
Adaptive DC-to-DC conversion boosts the supply voltage only when necessary (when the
output signal level is high). This maximizes the output power of the class-D audio amplifier
while limiting quiescent power consumption. The TFA9887 also adapts the amplifier gain
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to limit battery current when the battery voltage is low.
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 TFA9887 is available in a 29-bump WLCSP (Wafer Level Chip-Size Package) with a
400 m pitch.
2. Features and benefits
Sophisticated speaker-boost and protection algorithm that maximizes speaker
performance while protecting the speaker:
Fully embedded software, no additional license fee or porting required.
Total integrated solution that includes DSP, amplifier, DC-to-DC, sensing and more.
Adaptive excursion control - guarantees that the speaker membrane excursion never
exceeds its rated limit
Real-time temperature protection - direct measurement ensures that voice coil
temperature never exceeds its rated limit
Datasheet pdf - http://www.DataSheet4U.co.kr/
1 page  
NXP Semiconductors
TFA9887
Audio system with adaptive sound maximizer and speaker 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
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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
TFA9887_SDS
Product short data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 11 July 2012
© NXP B.V. 2012. All rights reserved.
5 of 20
Datasheet pdf - http://www.DataSheet4U.co.kr/
5 Page 
NXP Semiconductors
TFA9887
Audio system with adaptive sound maximizer and speaker 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 = 10 %; CLIP = 00
-
2.55 -
W
-
2.65 -
W
-
1.5 -
W
-
1.65 -
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
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 bypassedwww.DataSheet.net/
-
-
0.03 0.1 %
31 -
V
CoolFlux DSP enabled
-
45 -
V
S/N signal-to-noise ratio
VO = 4.5 V (peak); A-weighted
CoolFlux DSP bypassed
-
100 -
dB
CoolFlux DSP enabled
-
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)
td(mute_off)
td(soft_mute)
turn-off delay time
mute off delay time
soft mute delay time
fs = 48 kHz
- - 6 ms
- - 10 s
- 1 - ms
- 1 - ms
[1] LBST = boot converter inductance; RL = load resistance; LL = load inductance (speaker).
TFA9887_SDS
Product short data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 11 July 2012
© NXP B.V. 2012. All rights reserved.
11 of 20
Datasheet pdf - http://www.DataSheet4U.co.kr/
11 Page | ||
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