APA2120/2121
Stereo 2-W Audio Power Amplifier (with DC_Volume Control)
Features
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Low operating current with 14mA
Improved depop circuitry to eliminate turn-on
and turn off transients in outputs
High PSRR
32 steps volume adjustable by DC voltage with
hysteresis
2W per channel output power into 4Ω load at 5V,
BTL mode
Two output modes allowable with BTL and SE
modes selected by SE/BTL pin
Low current consumption in shutdown mode
(50µA)
Short Circuit Protection
Power off depop circuit integration
TSSOP-24 with or without thermal pad package
General Description
APA2120/1 is a monolithic integrated circuit, which
provides precise DC volume control, and a stereo
bridged audio power amplifiers capable of producing
2.7W(2.0W) into 3Ω with less than 10% (1.0%)
THD+N. The attenuator range of the volume control
in APA2120/1 is from 20dB (DC_Vol=0V) to -80dB
(DC_Vol=3.54V) with 32 steps. The advantage of
internal gain setting can be less components and PCB
area. Both of the depop circuitry and the thermal
shutdown protection circuitry are integrated in
APA2120/1, that reduce pops and clicks noise dur-
ing power up or shutdown mode operation. It also
improves the power off pop noise and protects the
chip from being destroyed by over temperature and
short current failure. To simplify the audio system
Applications
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NoteBook PC
LCD Monitor or TV
design, APA2120/1 combines a stereo bridge-tied
loads (BTL) mode for speaker drive and a stereo
single-end (SE) mode for headphone drive into a
single chip, where both modes are easily switched
by the SE/BTL input control pin signal. Besides, the
multiple input selection is used for portable audio
system.
Ordering and Marking Information
A P A 2 1 2 0 /1
H a n d lin g C o d e
Tem p. R ange
P ackage C ode
P ackage C ode
R : T S S O P -P *
Tem p. R ange
I : - 4 0 to 8 5
°
C
H a n d lin g C o d e
TU : Tube
T Y : T ra y
TR : Tape & R eel
A P A 2 1 2 0 /1 R :
A P A 2 1 2 0 /1
XXXXX
X X X X X - D a te C o d e
* TSSOP-P is a standard TSSOP package with a thermal pad exposure on the bottom of the package.
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 - Mar., 2003
1
www.anpec.com.tw
ANPEC [ ANPEC ELECTRONICS COROPRATION ]
