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PDF TFA9882 Data sheet ( Hoja de datos )
| Número de pieza | TFA9882 | |
| Descripción | 3.4 W I2S input mono class-D audio amplifier | |
| Fabricantes | NXP Semiconductors | |
| Logotipo |  |
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TFA9882
3.4 W I2S input mono class-D audio amplifier
Rev. 2 — 20 April 2011
Product data sheet
1. General description
The TFA9882 is a mono, filter-free class-D audio amplifier in a 9-bump WLCSP (Wafer
Level Chip-Size Package) with a 400 μm pitch.
It receives audio and control settings via an I2S digital interface. The Power-down to
Operating mode transition is triggered when a clock signal is detected on the bit clock
input (BCK). Two devices can be combined to build a stereo application.
In stereo applications, the left or right I2S audio stream is selected by connecting the word
select signal to, respectively, pin WSL or pin WSR. Mono mixing can be achieved by
connecting the word select signal to both WSL and WSR. Switching off the word select
signal selects Mute mode.
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 the TFA9882
provides excellent audio performance and high supply voltage ripple rejection.
2. Features and benefits
Small outline WLCSP9 package: 1.27 × 1.49 × 0.6 mm
Wide supply voltage range (fully operationalwww.DataSheet.net/ from 2.5 V to 5.5 V)
High efficiency (90 %, 4 Ω/20 μH load) and low power dissipation
Quiescent power:
6.5 mW (VDDD = 1.8 V, VDDP = 3.6 V, 4 Ω/20 μH load, fs = 32 kHz)
7.65 mW (VDDD = 1.8 V, VDDP = 3.6 V, 4 Ω/20 μH load, fs = 48 kHz)
Output power:
1.4 W into 4 Ω at 3.6 V supply (THD = 1 %)
2.7 W into 4 Ω at 5.0 V supply (THD = 1 %)
3.4 W into 4 Ω at 5.0 V supply (THD = 10 %)
Output noise voltage: 24 μV (A-weighted)
Signal-to-noise ratio: 103 dB (VDDP = 5 V, A-weighted)
Fully short-circuit proof across load and to supply lines
Current limiting to avoid audio holes
Thermally protected
Undervoltage and overvoltage protection
High-pass filter for DC blocking
Simplified interface for audio and control settings
Left/right selection and mono mixing
Three gain settings: −3 dB, 0 dB and +3 dB
Datasheet pdf - http://www.DataSheet4U.co.kr/
1 page  
NXP Semiconductors
TFA9882
3.4 W I2S input mono class-D audio amplifier
8. Functional description
The TFA9882 is a high-efficiency mono Bridge Tied Load (BTL) class-D audio amplifier
with a digital stereo I2S input interface. A High-Pass (HP) filter removes the DC
components from the incoming I2S stream. This stream is subsequently converted into
two Pulse Width Modulated (PWM) signals. A 3-level PWM scheme supports filterless
speaker drive.
8.1 Mode selection and interfacing
The TFA9882 supports four operating modes:
• Power-down mode, with low supply current
• Mute mode, in which the output stages are floating so that the audio input signal is
suppressed
• Operating mode, in which the amplifier is fully operational, delivering an output signal
• Fault mode
The TFA9882 switches to Fault mode automatically when a protection mechanism is
activated (see Section 8.8). The defined patterns required on the BCK, WSL and WSR
inputs to select the other three modes are given in Table 4.
Power-down mode is selected when there is no bit clock signal on the BCK input.
Applying the bit clock signal will cause the TFA9882 to switch from Power-down mode to
Operating mode (provided the word select signal is switched on).
www.DataSheet.net/
Mute mode is activated when the word select signal is switched off.
The left or right channel is selected by applying the word select signal to, respectively, the
WSL or the WSR terminal. The word select terminal not connected should be connected
to VDDP or to PCB ground. This simplifies the connection to the VDDP terminal in the
WLCSP9 package.
When the word select signal is connected to both terminals, the TFA9882 amplifies the
sum of both channels divided by two.
Table 4. Mode selection
Mode
Channel
Frequency on BCK
Frequency on WSL
Power-down
0 Hz
don’t care
Mute
2.048 MHz to 3.072 MHz 0 Hz
Operating left
2.048 MHz to 3.072 MHz 32 kHz to 48 kHz
right 2.048 MHz to 3.072 MHz 0 Hz
(left + right) / 2 2.048 MHz to 3.072 MHz 32 kHz to 48 kHz
Frequency on WSR
don’t care
0 Hz
0 Hz
32 kHz to 48 kHz
32 kHz to 48 kHz
OUTA, OUTB
floating
floating
switching
switching
switching
TFA9882
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 20 April 2011
© NXP B.V. 2011. All rights reserved.
5 of 31
Datasheet pdf - http://www.DataSheet4U.co.kr/
5 Page 
NXP Semiconductors
TFA9882
3.4 W I2S input mono class-D audio amplifier
8.8.2 Supply voltage protection mechanisms (UVP and OVP)
UVP is activated, setting the outputs floating, if the supply voltage drops below the
undervoltage protection threshold, VP(uvp). This transition will be silent, without pop noise.
When the supply voltage rises above VP(uvp) again, the system will be restarted after
200 ms.
OVP is activated, setting the power stages floating, if the supply voltage rises above the
overvoltage protection threshold, VP(ovp). The power stages are re-enabled as soon as the
supply voltage drops below VP(ovp) again. The system will be restarted after 200 ms.
8.8.3 OverCurrent Protection (OCP)
OCP will detect a short circuit across the load or between one of the amplifier outputs and
one of the supply lines. If the output current exceeds the overcurrent protection threshold
(IO(ocp)), it will be limited to IO(ocp) while the amplifier outputs are switching (the amplifier is
not powered down completely). This is called current limiting. The amplifier can
distinguish between an impedance drop at the loudspeaker and a low-ohmic short circuit
across the load or to one of the supply lines. The impedance threshold depends on which
supply voltage is being used:
• In the event of a short circuit across the load or a short to one of the supply lines, the
audio amplifier is switched off completely. It will try to restart again after approximately
200 ms. If the short-circuit condition is still present after this time, this cycle will be
repeated. Average dissipation will be low because of the short duty cycle.
• In the event of an impedance drop (e.g. due to dynamic behavior of the loudspeaker),
the same protection mechanism will be activated. The maximum output current is
www.DataSheet.net/
again limited to IO(ocp), but the amplifier will not switch off completely (thus preventing
audio holes from occurring). This will result in a clipped output signal without artifacts.
TFA9882
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 20 April 2011
© NXP B.V. 2011. All rights reserved.
11 of 31
Datasheet pdf - http://www.DataSheet4U.co.kr/
11 Page | ||
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| PDF Descargar | [ Datasheet TFA9882.PDF ] | |
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