APA2178 Datasheet, PDF (1/30 Pages) Anpec Electronics Coropration – 100mW Stereo Cap-Free Headphone Driver

APA2178
100mW Stereo Cap-Free Headphone Driver
Features
• No Output Capacitor Required
• Operating Voltage: 1.8V~4.5V
• Supply Current
– I =5mA at V =3.3V
DD
DD
• Low Shutdown Current
– I_DD=1µA at V_DD=3.3V
• Meeting VISTA Requirements
• Output Power
at 1% THD+N
–
70mW,
at
V =3.3V,
DD
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)
Simplified Application Circuit
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’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
16Ω, at THD+N=10% and provides thermal and short cir-
cuit protection.
Applications
• Handsets
• PDAs
• Portable multimedia devices
• Notebooks
R-CH
RIN
Input
L-CH
LIN
Input
Shutdown
Control
RSD
LSD
APA2178
Stereo
Headphone
ROUT
LOUT
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.
1
Rev. A.3 - Jul., 2009
www.anpec.com.tw