General Description

The APA2178 is a stereo, fixed gain, Cap-Free headphone driver which is available in a WLCSP2x2-16 package.

The APA2178 is a ground-reference output, and doesn’t need the output capacitors for DC blocking. The advantages of eliminating the output capacitor are saving the cost, PCB’s space, and component height.

The built-in gain setting can minimize the external component counts and save the PCB space. High PSRR provides increased immunity to noise and RF rectification. In addition to these features, a fast startup time and small package size make the APA2178 an ideal choice for portable multimedia device.

Features

• No Output Capacitor Required

• Operating Voltage: 1.8V~4.5V

• Supply Current

– IDD=5mA at VDD=3.3V

• Low Shutdown Current

– IDD=1mA at VDD=3.3V

• Meeting VISTA Requirements

• Output Power at 1 THD+N

– 70mW, at VDD=3.3V, RL = 16W at 10 THD+N

– 100mW, at VDD=3.3V, RL = 16W

• Less External Components Required

• High PSRR: 78dB at 217Hz

• Short-Circuit and Thermal Protection

• ± 8KV ESD Performance

• Surface-Mount Packaging

– WLCSP2x2-16

• Lead Free and Green Devices Available (RoHS Compliant)

Applications

• Handsets

• PDAs

• Portable multimedia devices

• Notebooks