APA2058 Datasheet, PDF (1/28 Pages) Anpec Electronics Coropration – 2.4W Stereo Fully Differential Audio Power Amplifier With Stereo Class AB Cap-free Headphone Driver and LDO

APA2058
2.4W Stereo Fully Differential Audio Power Amplifier With Stereo Class AB
Cap-free Headphone Driver and LDO
Features
• Meeting VISTA^TM Requirement
• Fully Differential Power Amplifier with
Excellent RF Rectification Immunity
• No Output Capacitor Required for Head
Phone Driver
• Integrated LDO (Low Dropout Regulator) for
Audio Codec (3.3V)
• Adjustable Gain Setting for Power Amplifier
• A_V=-1.5V/V Fixed Gain Setting for Headphone
Driver
• Fast Start-up Time
• Integrated De-Pop Circuitry
• High PSRR (Power Supply Rejection Ratio)
• Thermal and Over-Current Protections
• Less External Components Required
• Space Saving Package
– TQFN5x5-32A
• Lead Free and Green Devices Available
(RoHS Compliant)
Applications
• LCD Monitor
• Notebook
• Protable DVD
Simplified Application Circuit
Audio
Codec
LDO (Low Drop
-Out Regulator)
Stereo
Speakers
Stereo
Headphone
General Description
The APA2058 is a stereo fully differential audio power
amplifier with stereo Class-AB cap-free headphone driver
and LDO available in a TQFN5X5-32A pins package.
The built-in gain setting at power amplifier can minimize
the external component counts. For the flexible application,
the gain can be set to 4-steps, 10, 12, 15.6, and 21.6dB by
gain control pins (GAIN0 and GAIN1). The power amplifier’s
fully differential architecture provides high PSRR, in-
creased immunity to noise and RF rectification.
The APA2058 power amplifiers are capable of driving
2.4W at V_DD=5V into 4Ω speaker, the cap-free headphone
drivers can provide 180mW at HV_DD=3.3V into16Ω
headphones, and the LDO has a maximum 200mA(3.3V)
driver current for audio codec. The APA2058 provides ther-
mal and over-current protections.
The cap-free headphone driver eliminates the DC block-
ing capacitors at outputs, save the PCB space. The inte-
gration of fully differential power amplifier, cap-free head-
phone driver, and LDO is a best solution for VISTA^TM re-
quirement and it can lower the total BOM costs.
+0
-10
V_DD=5.0V
R_L=4Ω
-20 ^AV=10dB
V_in=0.2V_PP
-30 ^C_i^=0.47µF
Input Short
-40 _{AMP Mode}
-50
-60
-70
-80
-90
-100
20
100
1k
Frequency (Hz)
10k 20k
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 - Aug., 2008
www.anpec.com.tw