APA2178
100mW Stereo Cap-Free Headphone Driver
Features
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 advan-
tages of eliminating the output capacitor are saving the
cost, PCB’ space, and component height.
s
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
16Ω, at THD+N=10% and provides thermal and short cir-
cuit protection.
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No Output Capacitor Required
Operating Voltage: 1.8V~4.5V
Supply Current
– I
DD
=5mA at V
DD
=3.3V
Low Shutdown Current
– I
DD
=1µA at V
DD
=3.3V
Meeting VISTA Requirements
Output Power
at 1% THD+N
– 70mW, at V
DD
=3.3V, R
L
= 16Ω
at 10% THD+N
– 100mW, at V
DD
=3.3V, R
L
= 16Ω
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)
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Applications
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Handsets
PDAs
Portable multimedia devices
Notebooks
Simplified Application Circuit
R-CH
Input
RIN
ROUT
L-CH
Input
LIN
Stereo
Headphone
APA2178
LOUT
Shutdown
Control
RSD
LSD
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.
Copyright
©
ANPEC Electronics Corp.
Rev. A.3 - Jul., 2009
1
www.anpec.com.tw
ANPEC [ ANPEC ELECTRONICS COROPRATION ]
