APA2057A
2.4W Stereo Audio Power Amplifier (with Gain Setting) & Capfree Headphone Driver
Features
General Description
The APA2057A is a monolithic integrated circuit, which
combines a stereo power amplifier and a stereo output
capacitor-less headphone amplifier. The stereo power
amplifier provides 19-steps gain setting for flexible
application. The headphone amplifier is ground-refer-
ence output, and no need the output capacitors for DC
blocking. The advantages of eliminating the output ca-
pacitor are saving the cost, PCB’ space and component
s
height.
Both the de-pop circuitry and the thermal shutdown
protection circuitry are integrated in the APA2057A,
which reduces pops and clicks noise during power on/
off and in shutdown mode. Thermal shutdown protects
the chip from being destroyed by over-temperature
failure. To simplify the audio system design in notebook
computer applications, the APA2057A provides the in-
ternal gain setting, and these features can minimize
components and PCB area.
The APA2057A is available in both TSSOP-28P and
TQFN5x5-28 packages. Both packages are character-
ized by space saving and thermal efficiency.
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Operating Voltage
– HV
DD
= 3.0~3.6V
– V
DD
= 4.5~5.5V
No Output Capacitor at Headphone Amplifier
Required
Meeting VISTA Requirement
Low Distortion
AMP mode
– THD+N=56dB, at V
DD
= 5V, R
L
= 4Ω, P
O
=1.5W
– THD+N=64dB, at V
DD
= 5V, R
L
= 8Ω, P
O
=0.9W
HP mode
– THD+N=73dB, at HV
DD
=3.3V, R
L
=16Ω
P
O
=125mW
– THD+N=77dB, at HV
DD
=3.3V, R
L
=32Ω,
P
O
=88mW
– THD+N=85dB, at HV
DD
=3.3V, R
L
=10kΩ,
V
O
=1.7Vrms
Output Power at 1% THD+N
– 1.9W, at V
DD
= 5V, AMP mode, R
L
= 4Ω
– 1.2W, at V
DD
= 5V, AMP mode, R
L
= 8Ω
at 10% THD+N
–2.4W at V
DD
= 5V, AMP mode, R
L
= 4Ω
–1.5W at V
DD
= 5V, AMP mode, R
L
= 8Ω
Depop Circuitry Integrated
Internal 19-steps Gain Setting for Flexible Applica-
tion
Thermal Shutdown Protection and Over Current
Protection Circuitry
High Supply Voltage Ripple Rejection
Surface-Mount Packaging
– TSSOP-28P (with enhanced thermal pad)
– TQFN5x5-28 (with enhanced thermal pad)
Lead Free Available (RoHS Compliant)
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Applications
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Note book PCs
LCD monitor
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.1 - Aug., 2007
1
www.anpec.com.tw
ANPEC [ ANPEC ELECTRONICS COROPRATION ]
