APA4835 Datasheet, PDF (1/22 Pages) Anpec Electronics Coropration – Stereo 2.8W Audio Power Amplifier with DC Volume Control and Selectable Gain

APA4835
Features
Stereo 2.8W Audio Power Amplifier with DC Volume Control
and Selectable Gain
General Description
• Operating Voltage : 3.3V to 5V
• Stereo switchable bridged/single-ended
power amplifiers
• DC Volume Control Interface , 0dB to –105dB
• Low Supply Current , I_DD = 13mA 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
– 2.2W/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
• System Beep Detect
• Thermal shutdown protection circuitry
• High supply voltage ripple rejection
• Low Crossover Distortion
• PC99 Compliant
• 28-pin TSSOP-P (with enhanced thermal pad)
power package available
Applications
• Notebook and Desktop Computers
• Multimedia Monitors
• Portable Applications
The APA4835 is a monolithic integrated circuit , which
provides DC volume control , and a stereo bridged
audio power amplifiers capable of producing 2.8W
(2.2W) into 3Ω with less than 10% (1.0%) THD+N.
APA4835 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 APA4835 is from 0dB (DC_Vol=0.7V_DD) to
–105dB (DC_Vol=0V) with 32 steps. Both of the
depop circuitry and the thermal shutdown protection
circuitry are integrated in APA4835 , that reduces
pops and clicks noise during power up or shutdown
mode operation , and protects the chip from being
destroyed by over temperature failure. To simplify
the audio system design , APA4835 combines a ste-
reo 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. Be-
sides the low supply current design to increase the
efficiency of the amplifiers , APA4835 also features a
shutdown function which keeps the supply current
only 0.7µA (typ).
Pin Description
GND
1
SHUTDOWN
2
Gain Select
3
Mode
4
Mute
5
V_DD
6
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.7 - Mar., 2003
www.anpec.com.tw