TFA9882 NXP Semiconductors, TFA9882 Datasheet - Page 5

• Manufacturer Part Number: TFA9882
• Description: The TFA9882 is a mono, filter-free class-D audio amplifier in a 9-bump WLCSP (WaferLevel Chip-Size Package) with a 400 µm pitch
• Manufacturer: NXP Semiconductors

NXP Semiconductors
8. Functional description
Table 4.
TFA9882
Product data sheet
Mode
Power-down
Mute
Operating
Mode selection
Channel
left
right
(left + right) / 2 2.048 MHz to 3.072 MHz 32 kHz to 48 kHz
8.1 Mode selection and interfacing
The TFA9882 is a high-efficiency mono Bridge Tied Load (BTL) class-D audio amplifier
with a digital stereo I
components from the incoming I
two Pulse Width Modulated (PWM) signals. A 3-level PWM scheme supports filterless
speaker drive.
The TFA9882 supports four operating modes:
The TFA9882 switches to Fault mode automatically when a protection mechanism is
activated (see
inputs to select the other three modes are given in
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).
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 V
WLCSP9 package.
When the word select signal is connected to both terminals, the TFA9882 amplifies the
sum of both channels divided by two.
•
•
•
•
DDP
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
Frequency on BCK
0 Hz
2.048 MHz to 3.072 MHz 0 Hz
2.048 MHz to 3.072 MHz 32 kHz to 48 kHz
2.048 MHz to 3.072 MHz 0 Hz
or to PCB ground. This simplifies the connection to the V
Section
All information provided in this document is subject to legal disclaimers.
2
S input interface. A High-Pass (HP) filter removes the DC
8.8). The defined patterns required on the BCK, WSL and WSR
Rev. 2 — 20 April 2011
Frequency on WSL
don’t care
2
S stream. This stream is subsequently converted into
3.4 W I2S input mono class-D audio amplifier
Table
Frequency on WSR
don’t care
0 Hz
0 Hz
32 kHz to 48 kHz
32 kHz to 48 kHz
4.
DDP
terminal in the
TFA9882
© NXP B.V. 2011. All rights reserved.
OUTA, OUTB
floating
floating
switching
switching
switching
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