Datasheet

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 I
2
S 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 I
2
S 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 operational 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 (V
DDD
= 1.8 V, V
DDP
= 3.6 V, 4 Ω/20 μH load, f
s
=32 kHz)
 7.65 mW (V
DDD
=1.8 V, V
DDP
= 3.6 V, 4 Ω/20 μH load, f
s
= 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 (V
DDP
= 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: −3dB, 0dB and +3dB
TFA9882
3.4 W I2S input mono class-D audio amplifier
Rev. 2 — 20 April 2011 Product data sheet