APA2181 Datasheet, PDF (1/21 Pages) Anpec Electronics Coropration – Low Supply Current, 50mW Stereo Cap-Free Headphone Driver

APA2181
Low Supply Current, 50mW Stereo Cap-Free Headphone Driver
Features
General Description
• Operating Voltage: 2.3V~5.5V
• Supply Current
- I =1mA at V =3.6V
DD
DD
• Low Shutdown Current
- I_DD=5µA at V_DD=3.6V
• Ground Reference Output
- No Output Capacitor Required (for DC Blocking)
- Save the PCB Space
- Reduce the BOM Costs
- Improve the Low Frequency Response
•
Output
Power
50mW/Ch
into
16Ω
at
V =3.6V
DD
• High PSRR: 80dB at 217Hz
• Fast Start-Up Time: 4ms
• Integrate the De-pop Circuitry
• Thermal Protection
• Integrated LDO (Low Dropout Regulator) for
Microphone Detection Circuit (1.9V)
• Surface-Mount Packaging
WLCSP1.6x1.6-12
• Lead Free and Green Devices Available
(RoHS Compliant)
Applications
The APA2181 is a stereo, fixed gain, single supply, and
cap-free headphone driver, which is available in a
WLCSP1.6x1.6-12 package.
The APA2181 is ground-reference output, and no need
the output capacitors for DC blocking. The advantages of
eliminating the output capacitor are saving the cost, elimi-
nating component height, and improving the low frequency
response.
The internal fixed gain setting (-1.5V/V) can minimize the
external component counts and save the PCB space. High
PSRR provides increased immunity to noise and RF
rectification. LDO is the best solution for microphone
detection circuit requirement, and it can lower the total
BOM costs.
The APA2181 is capable of driving 50mW at 3.6V into16Ω
load, and provides thermal protection.
Simplified Application Circuit
Stereo
RIN
Input
Signal
LIN
Shutdown SDN
Control
APA2181
Stereo
Headphone
ROUT
LOUT
LOUT _{To Microphone}
Detection Circuit
• Handsets
• PDAs
• Portable Multimedia Devices
• Notebooks
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.2 - Apr., 2010
www.anpec.com.tw