Copyright

© ANPEC Electronics Corp.

Rev. A.3 - Jul., 2009

www.anpec.com.tw

1

ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and

advise customers to obtain the latest version of relevant information to verify before placing orders.

100mW Stereo Cap-Free Headphone Driver

APA2178

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 advan-

tages of eliminating the output capacitor are saving the

cost, PCB’s space, and component height.

The built-in gain setting can minimize the external com-

ponent counts and save the PCB space. High PSRR pro-

vides 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 por-

table multimedia device.

Moreover, the APA2178 is also equipped other features.

For example, it is capable of driving 100mW at 3.3V into

16

Ω, at THD+N=10% and provides thermal and short cir-

cuit protection.

Features

General Description

Applications

– I

– I

at 1% THD+N

– 70mW, at V

at 10% THD+N

– 100mW, at V

– WLCSP2x2-16

(RoHS Compliant)

Simplified Application Circuit

Stereo

Headphone

ROUT

RIN

RSD

LIN

LOUT

LSD

R-CH

Input

L-CH

Input

Shutdown

Control

APA2178