APA4838 Datasheet, PDF (1/29 Pages) Anpec Electronics Coropration – Stereo 2.8W Audio Power Amplifier with DC Volume Control and Selectable Gain

APA4838
Stereo 2.8W Audio Power Amplifier with DC Volume Control
and Selectable Gain
Features
General Description
• Operating Voltage : 4.5V to 5V
The APA4838 is a monolithic integrated circuit , which
• Stereo switchable bridged/single-ended
provides DC volume control , and a stereo bridged
audio power amplifiers capable of producing 2.8W
power amplifiers
(2.3W) into 3Ω with less than 10% (1.0%) THD+N.
• DC Volume Control Interface , 0dB to –78dB
with precision scale
APA4838 includes a DC volume control , stereo
bridge-tied and single-ended audio power amplifiers
, stereo docking outputs , and a selectable gain con-
• Supply Current , I_DD = 15mA at Stereo BTL
• Low Shutdown Current , I_DD = 0.7µA
trol , that makes it optimally fittable for notebook PC
, multimedia monitors , and other portable
applications. The attenuator range of the volume
• Bridge-Tied Load (BTL) or Single-Ended-(SE) control in APA4838 is from 0dB (DC_Vol=0.8V_DD) to
Modes Operation
•
Output Power at 1% THD+N , V =5V
DD
–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
– 2.3W/Ch (typ) into a 3 Ω Load
clicks noise during power up or shutdown mode op-
– 2.0W/Ch (typ) into a 4 Ω Load
eration , and protects the chip from being destroyed
by over temperature failure. To simplify the audio
– 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
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
– 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
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).
• Depop Circuitry Integrated
• Thermal shutdown protection and over current ^{Pin Description}
protection circuitry
• High supply voltage ripple rejection
• PC99 Compliant
• 28-pin TSSOP-P (with enhanced thermal pad)
power package available
Applications
• Notebook and Desktop Computers
• Multimedia Monitors
• Portable Applications
GND
1
Shutdown
2
Gain Select
3
Mode
4
Mute
5
V
6
DD
DC Vol
7
GND
8
Right Dock
9
Right In
10
Beep In
11
Left In
12
Left Dock
13
GND
14
28
Right Out +
27
V_DD
26
Right Out -
25
Right Gain 2
24
Right Gain 1
23
GND
22
BYPASS
21
HP Sense
20
GND
19
Left Gain 1
18
Left Gain 2
17
Left Out -
16
V
DD
15
Left Out +
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.1 - Apr., 2003
www.anpec.com.tw