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APA4838 Datasheet(PDF) 1 Page - Anpec Electronics Coropration

Part No. APA4838
Description  Stereo 2.8W Audio Power Amplifier with DC Volume Control and Selectable Gain
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Maker  ANPEC [Anpec Electronics Coropration]
Homepage  http://www.anpec.com.tw
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 1 page
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Stereo 2.8W Audio Power Amplifier with DC Volume Control
and Selectable Gain
Copyright
 ANPEC Electronics Corp.
Rev. A.1 - Apr., 2003
APA4838
www.anpec.com.tw
1
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.
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
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 8
Ω Load
Single-ended mode at 1.0% THD+N
95mW/Ch (typ) into 32
Ω 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
Features
General Description
Applications
Pin Description
Notebook and Desktop Computers
Multimedia Monitors
Portable Applications
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 3
Ω 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).
S hutdow n
GND
V
DD
GND
HP Sense
BY PA SS
Right Dock
G ain S elect
Mode
Mute
DC V ol
R ight In
B eep In
Left In
Left D ock
GND
10
1
2
3
4
5
6
7
8
9
11
12
13
14
R ight O ut +
V
DD
R ight O ut -
R ight G ain 2
R ight G ain 1
GND
Left G ain 1
Left G ain 2
Left O ut -
GND
V
DD
Left O ut +
28
27
26
25
24
23
22
21
20
19
18
17
16
15




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