TFA9881

TFA9881 3.4 W PDM input class-D audio amplifier Rev. 3 — 23 April 2013 Product data sheet 1. General description The TFA9881 is a mono, filter-free class-D audio amplifier in a 9-bump WLCSP (Wafer Level Chip-Size Package) with a 400 m pitch. The digital input interface is an over-sampled Pulse Density Modulated (PDM) bit stream. The TFA9881 receives audio and control settings via this interface. Dedicated silence patterns are used to configure the control settings of the device, such as mute, gain, Pulse Width Modulated (PWM) output slope, clip control and bandwidth extension (this control mechanism is not required if the default settings are used). The Power-down to Operating mode transition is triggered when a clock signal is detected. 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 TFA9881 provides excellent audio performance and high supply voltage ripple rejection. 2. Features and benefits  Small outline WLCSP9 package: 1.3  1.3  0.6 mm  Wide supply voltage range (fully operational from 2.5 V to 5.5 V)  High efficiency (90 %, 4 /20 H load) and low power dissipation  Quiescent power:  6.5 mW (VDDD = 1.8 V, VDDP = 3.6 V, 4 /20 H load, fclk = 2.048 MHz)  7.8 mW (VDDD = 1.8 V, VDDP = 3.6 V, 4 /20 H load, fclk = 6.144 MHz)  Output power:  1.4 W into 4  at 3.6 V supply (THD = 1 %)  2.7 W into 4  at 5.0 V supply (THD = 1 %)  3.4 W ...