APA4838
Stereo 2.8W Audio Power Amplifier with DC Volume Control
and Selectable Gain
Features
•
•
•
•
•
•
•
Operating Voltage : 4.5V to 5V
Stereo switchable bridged/single-ended
power amplifiers
DC Volume Control Interface , 0dB to –78dB
with precision scale
Supply Current , I
DD
= 15mA at Stereo BTL
Low Shutdown Current , I
DD
= 0.7µA
Bridge-Tied Load (BTL) or Single-Ended-(SE)
Modes Operation
Output Power at 1% THD+N , V
DD
=5V
General Description
The APA4838 is a monolithic integrated circuit , which
provides DC volume control , and a stereo bridged
audio power amplifiers capable of producing 2.8W
(2.3W) into 3Ω with less than 10% (1.0%) THD+N.
APA4838 includes a DC volume control , stereo
bridge-tied and single-ended audio power amplifiers
, stereo docking outputs , and a selectable gain con-
trol , that makes it optimally fittable for notebook PC
, multimedia monitors , and other portable
applications. The attenuator range of the volume
control in APA4838 is from 0dB (DC_Vol=0.8V
DD
) to
–78dB (DC_Vol=0V) with 31 steps. Both of the depop
circuitry and the thermal shutdown protection circuitry
are integrated in APA4838 , that reduces pops and
clicks noise during power up or shutdown mode op-
eration , and protects the chip from being destroyed
by over temperature failure. To simplify the audio
system design , APA4838 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 HP Sense input control pin signal. Besides
the low supply current design to increase the effi-
ciency of the amplifiers , APA4838 also features a
shutdown function which keeps the supply current
only 0.7µA (typ).
•
–
2.3W/Ch (typ) into a 3
Ω
Load
–
2.0W/Ch (typ) into a 4
Ω
Load
–
1.2W/Ch (typ) into a 8
Ω
Load
Output Power at 10% THD+N , V
DD
=5V
–
2.8W/Ch (typ) into a 3
Ω
Load
–
2.3W/Ch (typ) into a 4
Ω
Load
–
1.5W/Ch (typ) into a 8Ω Load
•
•
•
•
•
•
Single-ended mode at 1.0% THD+N
–
95mW/Ch (typ) into 32Ω Load
Depop Circuitry Integrated
Thermal shutdown protection and over current
protection circuitry
High supply voltage ripple rejection
PC99 Compliant
28-pin TSSOP-P (with enhanced thermal pad)
power package available
Pin Description
GN D
Shutdown
G ain Select
M ode
M ute
V
DD
DC V ol
GN D
Right Dock
Right In
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
Right O ut +
V
DD
Right O ut -
Right G ain 2
Right G ain 1
GN D
BY PA SS
HP Sense
GN D
Left G ain 1
Left G ain 2
Left O ut -
V
DD
Left O ut +
Applications
•
•
•
Notebook and Desktop Computers
Multimedia Monitors
Portable Applications
Beep In
Left In
Left Dock
GN D
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
-
Apr., 2003
1
www.anpec.com.tw
ANPEC [ ANPEC ELECTRONICS COROPRATION ]
