Operating Voltage
– HVDD= 3.0~3.6V
– VDD= 4.5~5.5V
No Output Capacitor at Headphone Amplifier
Required
Meeting VISTA Requirement
Low Distortion
AMP Mode
– THD+N=56dB, at VDD = 5V, RL = 4Ω, PO=1.5W
– THD+N=64dB, at VDD = 5V, RL = 8Ω, PO=0.9W
HP Mode
– THD+N=73dB, at HVDD=3.3V, RL=16Ω
PO=125mW
– THD+N=77dB, at HVDD=3.3V, RL=32Ω,
PO=88mW
– THD+N=85dB, at HVDD=3.3V, RL=10kΩ,
VO=1.7Vrms
Output Power at 1% THD+N
– 1.9W, at VDD = 5V, AMP Mode, RL = 4Ω
– 1.2W, at VDD = 5V, AMP Mode, RL = 8Ω
at 10% THD+N
–2.4W at VDD = 5V, AMP Mode, RL = 4Ω
–1.5W at VDD = 5V, AMP Mode, RL = 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 and Green Devices Available


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 doesn’t need the output capacitors for
DC blocking. The advantages of eliminating the output
capacitor are saving cost, PCB’s space, and component
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.
 
 
Applications
· Note Book PCs
· LCD Monitor