Copyright
ANPEC Electronics Corp.
Rev. A.2 - Jul., 2005
APA2068
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.
Stereo 2.6W Audio Power Amplifier (with DC_Volume Control)
Features
Low Operating Current with 9mA
Improved Depop Circuitry to Eliminate Turn-on
and Turn-off Transients in Outputs
High PSRR
32 Steps Volume Adjustable by DC Voltage with
Hysteresis
2.6W per Channel Output Power into 4
Load at
5V,BTL Mode
Two Output Modes Allowable with BTL and SE
Modes Selected by SE/BTL pin
Low Current Consumption in Shutdown Mode
(1
A)
Short Circuit Protection
Thermal shutdown protection and over current
protection circuitry
Maximum Output Swing Clamping Function
SOP-16-P Packages with Thermal Pad Package
Lead Free Available (RoHS Compliant)
Applications
General Description
Ordering and Marking Information
APA2068 is a monolithic integrated circuit, which
provides precise DC volume control, and a stereo
bridged audio power amplifiers capable of producing
2.6W (1.8W) into 4
with less than 10% (1.0%)THD+N.
The attenuator range of the volume control in APA2068
is from 20dB (DC_Vol=0V) to -80dB (DC_Vol=3.54V)
with 32 steps. The advantage of internal gain setting
can be less components and PCB area. Both of the
depop circuitry and the thermal shutdown protection
circuitry are integrated in APA2068, that reduce pops
and clicks noise during power up or shutdown mode
operation. It also improves the power off pop noise
and protects the chip from being destroyed by over
temperature and short current failure. To simplify the
audio system design, APA2068 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 SE/BTL input control pin signal.
NoteBook PC
LCD Monitor or TV
APA2068
Handling Code
Temp. Range
Package Code
Package Code
KA : SOP-16-P
Operating Ambient Temp. Range
I : - 40 to 85 C
Handling Code
TU : Tube TR : Tape & Reel
Lead Free Code
L : Lead Free Device Blank : Original Device
APA2068 KA :
APA2068
XXXXX
XXXXX - Date Code
Lead Free 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 and compatible with both SnPb and lead-free soldiering
operations. 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.
Copyright
ANPEC Electronics Corp.
Rev. A.2 - Jul., 2005
APA2068
www.anpec.com.tw
2
Block Diagram
(Over operating free-air temperature range unless otherwise noted.)
Symbol
Parameter
Rating
Unit
V
DD
Supply Voltage Range
-0.3 to 6
V
V
IN
Input Voltage Range, SE/BTL,
SHUTDOWN, Mute
-0.3 to V
DD
+0.3
V
T
A
Operating Ambient Temperature Range
-40 to 85
C
T
J
Maximum Junction Temperature
Intermal Limited*
1
C
T
STG
Storage Temperature Range
-65 to +150
C
T
S
Soldering Temperature,10 seconds
260
C
V
ESD
Electrostatic Discharge
-3000 to 3000*
2
-200 to 200*
3
V
P
D
Power Dissipation
Intermal Limited
Absolute Maximum Ratings
Notes:
1.APA2068 integrated internal thermal shutdown protection when junction temperature ramp up to 150C
2.Human body model: C=100pF, R=1500
, 3 positives pulse plus 3 negative pulses
3.Machine model: C=200pF, L=0.5
F, 3 positive pulses plus 3 negative pulses
S h u t d o w n
c k t
P o w e r a n d
D e p o p c i r c u i t
SE/BTL
LOUT+
LOUT-
LIN-
SE/BTL
S H U T D O W N
B Y PA S S
M u t e
MUTE
V o l u m e
C o n t r o l
VOLUME
A P A 2 0 6 8 _ B l o c k
ROUT+
RIN-
B Y P A S S
ROUT-
GND
V D D
V O L M A X
Min.
Max.
Unit
Supply Voltage, V
DD
4.5
5.5
V
SHUTDOWN, Mute
2
High level threshold voltage, V
IH
SE/BTL
4
V
SHUTDOWN, Mute
1.0
Low level threshold voltage, V
IL
SE/BTL
3
V
Common mode input voltage, V
ICM
V
DD
-1.0
V
Recommended Operating Conditions
Copyright
ANPEC Electronics Corp.
Rev. A.2 - Jul., 2005
APA2068
www.anpec.com.tw
3
V
DD
=5V, -20C<T
A
<85C
(unless otherwise noted)
Electrical Characteristics
Thermal Characteristics
APA2068
Symbol
Parameter
Test Condition
Min. Typ. Max.
Unit
V
DD
Supply Voltage
4.5
5.5
V
SE/BTL=0V
9
20
I
DD
Supply Current
SE/BTL=5V
4
10
mA
I
SD
Supply Current in Shutdown
Mode
SE/BTL=0V
SHUTDOWN=0V
1
A
I
IH
High input Current
900
nA
I
IL
Low Input Current
900
nA
V
OS
Output Differential Voltage
5
mV
Symbol
APA2068
Unit
Parameter
Test Condition
Min. Typ. Max.
P
O
THD=10%, R
L
=3
, Fin=1kHz
2.9
THD=10%, R
L
=4
, Fin=1kHz
2.6
THD=10%, R
L
=8
, Fin=1kHz
1.6
THD=1%, R
L
=3
, Fin=1kHz
2.4
THD=1%, R
L
=4
, Fin=1kHz
1.8
Maximum Output Power
THD=0.5%, R
L
=8
, Fin=1kHz
1
1.3
W
THD+N
P
O
=1.2W, R
L
=4
, Fin=1kHz
0.07
Total Harmonic Distortion Plus
Noise
P
O
=0.9W, R
L
=8
, Fin=1kHz
0.08
%
PSRR Power Ripple Rejection Ratio
V
IN
=0.1Vrms, R
L
=8
, C
B
=1
F,
Fin=120Hz
60
dB
Xtalk Channel Separation
C
B
=1
F, R
L
=8
, Fin=1kHz
90
dB
S/N
Signal to Noise Ratio
P
O
=1.1W, R
L
=8
, A_wieght
95
dB
Symbol
Parameter
Value
Unit
R
THJA
Thermal Resistance from Junction to Ambient in Free Air
SOP-16-P
45
C/W
Operating Characteristics, BTL mode
V
DD
=5V,T
A
=25C,R
L
=4
, Gain=2V/V (unless otherwise noted)
Copyright
ANPEC Electronics Corp.
Rev. A.2 - Jul., 2005
APA2068
www.anpec.com.tw
4
Electrical Characteristics (Cont.)
Operating Characteristics, SE mode. V
DD
=5V,T
A
=25C, Gain=1V/V (unless otherwise noted)
APA2068
Symbol
Parameter
Test Condition
Min. Typ. Max.
Unit
THD=10%, R
L
=16
, Fin=1kHz
220
THD=10%, R
L
=32
, Fin=1kHz
120
THD=1%, R
L
=16
, Fin=1kHz
160
P
O
Maximum Output Power
THD=1%, R
L
=32
, Fin=1kHz
95
mW
P
O
=125mW, R
L
=16
, Fin=1kHz
0.09
THD+N Total Harmonic Distortion Plus
Noise
P
O
=65mW, R
L
=32
, Fin=1kHz
0.09
%
PSRR Power Ripple Rejection Ratio
V
IN
=0.1Vrms, R
L
=8
, C
B
=1
F,
Fin=120Hz
60
dB
Xtalk Channel Separation
C
B
=1
F, R
L
=32
, Fin=1kHz
60
dB
S/N
Signal to Noise Ratio
P
O
=75mW, SE, R
L
=32
, A_wieght
100
dB
Pin Description
BYPASS 4
13 SE/BTL
VOLMAX 8
GND 5
15 VDD
LIN- 6
12 GND
SHUTDOWN 2
14 ROUT+
RIN- 3
16 ROUT-
11 LOUT+
10 VDD
VOLUME 7
MUTE 1
9 LOUT-
APA2068
Thermal Pad
(Connected to GND for better heat dissipation)
Pin Function Description
Pin
No.
Name
Config
Function Description
1
MUTE
I
Mute control signal input, hold low for normal operation, hold high
to mute.
2
SHUTDOWN
I
It will be into shutdown mode when pull low. I
SD
= 1
A
3
RIN-
I
Right channel input terminal
4
BYPASS
I
Bias voltage generator
5,12
GND
-
Ground connection, Connected to thermal pad.
6
LIN-
I
Left channel input terminal
7
VOLUME
I
Input signal for internal volume gain setting.
8
VOLMAX
I
Setting the maximum output swing. Input a non-zero voltage (V
C
)
to this pin, the output voltage swing will be clamped between V
OH
(the maximum positive value) - V
C
& V
OL
(the minimum negative
value) + V
C
. Disable this function when tie this pin to GND.
Maximum input voltage
1/2 VDD.
Copyright
ANPEC Electronics Corp.
Rev. A.2 - Jul., 2005
APA2068
www.anpec.com.tw
5
Pin
No.
Name
Config
Function Description
9
LOUT-
O
Left channel positive output in BTL mode and SE mode.
10,15
VDD
-
Supply voltage
11
LOUT+
O
Left channel negative output in BTL mode and high impedance in
SE mode.
13
SE/BTL
I
Output mode control input, high for SE output mode and low for
BTL mode.
14
ROUT+
O
Right channel negative output in BTL mode and high impedance
in SE mode.
16
ROUT-
O
Right channel positive output in BTL mode and SE mode.
Pin Function Description (Cont.)
SHUTDOWN
Mute
SE/BTL
Operating mode
L
X
X
Shutdown mode
H
L
L
BTL out
H
L
H
SE out
H
H
X
Mute
Control Input Table
Typical Application Circuit
SE/BTL Signal
4
4
Ring
Headphone
Jack
Sleeve
Control
Pin
Tip
SE/BTL
Signal
1
F
220
F
220
F
1k
1k
R-Ch
Input
V DD
100k
Shutdow n
Signal
1
F
L-CH
Input
V DD
VDD
GND
100
F
0.1
F
100k
Shutdown
ckt
SE/BTL
LOUT+
LOUT-
LIN-
SE/BTL
SHUTDOWN
BYPASS
Mute
MUTE
Volume
Control
VOLUME
A2068_AppCkt
ROUT+
RIN-
BYPASS
ROUT-
VOLMAX
MUTE Signal
V DD
50k
VOLMAX Signal
2.2
F
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