APA4838
Stereo 2.8W Audio Power Amplifier with DC Volume Control
and Selectable Gain
Features
General Description
The APA4838 is a monolithic integrated circuit, which pro-
vides 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 au-
dio power amplifiers, stereo docking outputs, and a se-
lectable gain control, 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 inte-
grated in APA4838, that reduces pops and clicks noise
during power up or shutdown mode operation, and pro-
tects 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 head-
phone 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
efficiency of the amplifiers, APA4838 also features a shut-
down function which keeps the supply current only 0.7µA
(typ).
•
•
•
•
•
•
•
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 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
Lead Free and Green Devices Available
(RoHS Compliant)
Pin Configuration
GND
Shutdown
Gain Select
Mode
Mute
VDD
DC Vol
GND
Right Dock
Right In
Beep In
Left In
Left Dock
GND
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 Out +
VDD
Right Out -
Right Gain 2
Right Gain 1
GND
BYPASS
HP Sense
GND
Left Gain 1
Left Gain 2
Left Out -
VDD
Left Out +
Applications
•
•
•
Notebook and Desktop Computers
Multimedia Monitors
Portable Applications
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.2
-
Nov., 2008
1
www.anpec.com.tw
APA4838
Ordering and Marking Information
APA4838
Assembly Material
Handling Code
Temperature Range
Package Code
APA4838 R :
APA4838
XXXXX
Package Code
R : TSSOP-28P
Temperature Range
I : -40 to 85
o
C
Handling Code
TR : Tape & Reel
Assembly Material
L : Lead Free Device
G : Halogen and Lead Free Device
XXXXX - Date Code
Note: ANPEC lead-free products contain molding compounds/die attach materials and 100% matte tin plate termination finish; which
are fully compliant with RoHS. ANPEC lead-free products meet or exceed the lead-free requirements of IPC/JEDEC J-STD-020C for
MSL classification at lead-free peak reflow temperature. ANPEC defines “Green” to mean lead-free (RoHS compliant) and halogen
free (Br or Cl does not exceed 900ppm by weight in homogeneous material and total of Br and Cl does not exceed 1500ppm by
weight).
Absolute Maximum Ratings
Symbol
V
DD
V
IN
T
A
T
J
T
STG
T
S
P
D
Supply Voltage
(Note 1)
Rating
-0.3 to 6
-0.3 to V
DD
+0.3
-40 to 85
Internally Limited
-65 to +150
260
Internally Limited
Unit
V
V
°C
°C
°C
°C
W
(Over operating free-air temperature range unless otherwise noted.)
Parameter
Input Voltage Range, HP sense, Shutdown, Mute, Mode, Gain
Select
Operating Ambient Temperature Range
Maximum Junction Temperature
Storage Temperature Range
Maximum Lead Soldering Temperature, 10 Seconds
Power Dissipation
Note 1 :APA4838 integrated internal thermal shutdown protection when junction temperature ramp up to 150°C
Thermal Characteristics
Symbol
θ
JA
Parameter
Thermal Resistance from Junction to Ambient in Free Air
(Note 2)
TSSOP-28P
Typical Value
45
Unit
o
C/W
Note 2 : 5 in
2
printed circuit board with 2oz trace and copper pad through 9 25mil diameter vias. The thermal pad on the TSSOP_P
package with solder on the printed circuit board.
Recommended Operating Conditions
Symbol
V
DD
V
IH
Supply Voltage
High Level Threshold Voltage
Shutdown, Mute, Mode, Gain Select
HP Sense
Low Level Threshold Voltage
Common Mode Input Voltage
2
Parameter
Range
4.5 ~ 5.5
2~
4~
~ 1.0
~3
V
DD
-1.0 ~
Unit
V
V
V
V
V
V
www.anpec.com.tw
V
IL
V
ICM
Shutdown, Mute, Mode, Gain Select
HP Sense
Copyright
©
ANPEC Electronics Corp.
Rev. A.2
-
Nov., 2008
APA4838
Electrical Characteristics
Electrical Characteristics for Entire IC
The following specifications apply for V
DD
= 5V unless otherwise noted. Limits apply for T
A
= 25°C
Symbol
V
DD
I
DD
I
SD
Parameter
Supply Voltage
Quiescent Power Supply Current
Shutdown Current
V
IN
=0V, I
O
=0A
V
PIN 2
= V
DD
Test Conditions
APA4838
Min.
4.5
-
-
Typ.
-
15
0.7
Max.
5.5
25
2.0
Unit
V
mA
µA
Electrical Characteristics for Volume Attenuators
The following specifications apply for V
DD
= 5V. Limits apply for T
A
= 25°C
Symbol
Parameter
Test Conditions
Gain with V
PIN 7
=5V
C
RANGE
Attenuator Range
Attenuation with V
PIN 7
=0V
V
PIN 5
=5V, Bridged Mode
A
M
Mute Attenuation
V
PIN 5
=5V, Single-Ended Mode
-70
-
-
-65
-70
-78
-
-
-
dB
Min.
-
APA4838
Typ.
-
Max.
±0.5
dB
Unit
Electrical Characteristics for BTL Mode Operation
The following specifications apply for V
DD
= 5V unless otherwise noted. Limits apply for T
A
= 25°C
Symbol
V
OS
Parameter
Output Offset Voltage
V
IN
=0V
THD+N=1%, f
in
=1kHz
R
L
=3Ω
R
L
=4Ω
R
L
=8Ω
THD+N=10%, f
in
=1kHz
R
L
=8Ω
THD+N
PSRR
Crosstalk
S/N
V
N
A
VD
=2, f
in
=1kHz
Total Harmonic Distortion + Noise R
L
=4Ω, P
O
=1.5W
R
L
=8Ω, P
O
=1W
V
RIPPLE
=100mV
Rms
C
B
=2.2µF,
Power Supply Rejection Ratio
R
L
=8Ω, f
in
=1kHz
Channel Separation
Signal-to-Noise Ratio
Output Noise Voltage
C
B
=2.2µF, f
in
=1kHz, R
L
=8Ω
V
DD
=5V, P
O
=1.1W,
R
L
=8Ω,A-Weighting Filter
R
L
=8Ω,A-Weighting Filter
Test Conditions
Min.
-
APA4838
Typ.
5
2.3
2.0
1.2
1.5
0.07
0.07
70
90
95
30
-
-
-
-
Max.
-
Unit
mV
-
-
W
-
%
dB
dB
dB
µV
P
O
Output Power
-
-
-
-
-
-
Copyright
©
ANPEC Electronics Corp.
Rev. A.2
-
Nov., 2008
3
www.anpec.com.tw
APA4838
Electrical Characteristics (Cont.)
Electrical Characteristics for BTL Mode Operation
The following specifications apply for V
DD
= 5V unless otherwise noted. Limits apply for T
A
= 25°C
Symbol
V
OS
Parameter
Output Offset Voltage
V
IN
=0V
THD+N=1%, f
in
=1kHz
R
L
=3Ω
R
L
=4Ω
R
L
=8Ω
THD+N=10%, f
in
=1kHz
R
L
=8Ω
THD+N
PSRR
A
VD
=2, f
in
=1kHz
Total Harmonic Distortion + Noise R
L
=4Ω , P
O
=1.5W
R
L
=8Ω , P
O
=1W
V
RIPPLE
=100mV
Rms
C
B
=2.2µF,
Power Supply Rejection Ratio
R
L
=8Ω, f
in
=1kHz
C
B
=2.2µF, f
in
=1kHz, R
L
=8Ω
V
DD
=5V, P
O
=1.1W,
R
L
=8Ω,A-Weighting Filter
R
L
=8Ω,A-Weighting Filter
Test Conditions
Min.
-
APA4838
Typ.
5
2.3
2.0
1.2
1.5
0.07
0.07
70
90
95
30
Max.
-
Unit
mV
-
-
W
-
-
-
-
-
-
%
dB
dB
dB
µV
P
O
Output Power
-
-
-
-
-
-
Crosstalk Channel Separation
S/N
V
N
Signal-to-Noise Ratio
Output Noise Voltage
Electrical Characteristics for SE Mode Operation
The following specifications apply for V
DD
= 5V unless otherwise noted. Limits apply for T
A
= 25°C
Symbol
V
OS
P
O
Parameter
Output Offset Voltage
Output Power
V
IN
=0V
THD+N=1%, f
in
=1kHz
THD+N=10%, f
in
=1kHz
A
V
= 1, V
OUT
=1V
RMS
, R
L
=10kΩ,
f
in
=1kHz
P
O
=75mW, R
L
=32Ω, A
V
= 1,
f
in
=1kHz
V
RIPPLE
=100mV
RMS
, f
in
=120Hz,
C
B
=2.2µF
C
B
=2.2µF, R
L
=8Ω , f
in
=1kHz
P
O
=75mW, R
L
=32Ω, A-Weighting
Filter
R
L
=32Ω, A-Weighting Filter
Test Conditions
Min.
-
-
-
-
-
-
-
-
-
APA4838
Typ.
5
95
110
0.05
0.07
52
90
102
20
-
-
-
Max.
-
-
-
-
-
Unit
mV
mW
%
%
dB
dB
dB
µV
THD+N
Total Harmonic Distortion Plus
Noise
Power Supply Rejection Ratio
PSRR
Crosstalk Channel Separation
S/N
V
N
Signal-to-Noise Ratio
Output Noise Voltage
Copyright
©
ANPEC Electronics Corp.
Rev. A.2
-
Nov., 2008
4
www.anpec.com.tw
APA4838
Pin Description
PIN
NAME
GND
Shutdown
Gain Select
Mode
Mute
VDD
DC_Vol
Right Dock
Right In
Beep In
Left In
Left Dock
Left Out +
Left Out -
Left Gain 2
Left Gain 1
HP Sense
Bypass
Right Gain 1
Right Gain 2
Right Out -
Right Out +
NO.
1, 8, 14, 20,
23
2
3
4
5
6, 16, 27
7
9
10
11
12
13
15
17
18
19
21
22
24
25
26
28
I
I
I/O
Ground connection for circuitry.
I
I
I
I
Shutdown mode control signal input, place entire IC in shutdown mode when held high,
Idd=0.7µA
Gain select input pin, logic high will switch the amplifier to external gain mode, and logic low
will switch to internal unity gain.
Mode select input pin, fixed gain when logic L and gain adjustable mode when logic H.
Mute control input pin, active H.
Supply voltage input pin
Volume control function input pin.
FUNCTION
O Right docking output pin
I
I
I
Right channel audio input pin
Beep signal input pin
Left channel audio input pin
O Right docking output pin
O Left channel positive output pin
O Left channel negative output pin
Connect pin 2 of the external gain setting resistor for left channel
Connect pin 1 of the external gain setting resistor for left channel
Headphone sense control pin
Bypass pin
Connect pin 1 of the external gain setting resistor for right channel
Connect pin 2 of the external gain setting resistor for right channel
O Right channel negative output pin
O Right channel positive output pin
Copyright
©
ANPEC Electronics Corp.
Rev. A.2
-
Nov., 2008
5
www.anpec.com.tw
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