APA2181
Low Supply Current, 50mW Stereo Cap-Free Headphone Driver
Features
•
•
•
•
Operating Voltage: 2.3V~5.5V
Supply Current
- I
DD
=1mA at V
DD
=3.6V
Low Shutdown Current
- I
DD
=5µA at V
DD
=3.6V
Ground Reference Output
- No Output Capacitor Required (for DC Blocking)
- Save the PCB Space
- Reduce the BOM Costs
- Improve the Low Frequency Response
General Description
The APA2181 is a stereo, fixed gain, single supply, and
cap-free headphone driver, which is available in a
WLCSP1.6x1.6-12 package.
The APA2181 is ground-reference output, and no need
the output capacitors for DC blocking. The advantages of
eliminating the output capacitor are saving the cost, elimi-
nating component height, and improving the low frequency
response.
The internal fixed gain setting (-1.5V/V) can minimize the
external component counts and save the PCB space. High
PSRR provides increased immunity to noise and RF
rectification. LDO is the best solution for microphone
detection circuit requirement, and it can lower the total
BOM costs.
The APA2181 is capable of driving 50mW at 3.6V into16Ω
load, and provides thermal protection.
•
•
•
•
•
•
•
•
Output Power 50mW/Ch into 16Ω at V
DD
=3.6V
High PSRR: 80dB at 217Hz
Fast Start-Up Time: 4ms
Integrate the De-pop Circuitry
Thermal Protection
Integrated LDO (Low Dropout Regulator) for
Microphone Detection Circuit (1.9V)
Surface-Mount Packaging
WLCSP1.6x1.6-12
Lead Free and Green Devices Available
(RoHS Compliant)
Simplified Application Circuit
Stereo
Headphone
Stereo
Input
Signal
Shutdown
Control
RIN
LIN
ROUT
APA2181
SDN
LOUT
LOUT To Microphone
Detection Circuit
Applications
•
•
•
•
Handsets
PDAs
Portable Multimedia Devices
Notebooks
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 - Apr., 2010
1
www.anpec.com.tw
APA2181
Pin Configuration
LOUT
(C1)
ROUT
(C2)
LIN
(C3)
RIN
(C4)
VSS
(B1)
SDN
(B2)
GND
(B3)
VDD
(B4)
VOUT
(A1)
CPN
(A2)
PGND
(A3)
CPP
(A4)
A 8 1
V X
Marking
Date
Code
PIN A1
WLCSP1.6x1.6-12
(Top View)
Voltage Code
Ordering and Marking Information
APA2181
Assembly Material
Handling Code
Temperature Range
Package Code
Voltage Code
A81
VX
Voltage Code
D : 1.9V M : 2.8V
Package Code
HA : WLCSP1.6x1.6-12
Temperature Range
I : - 40 to 85
o
C
Handling Code
TR : Tape & Reel
Assembly Material
G : Halogen and Lead Free Device
X - Date Code ; V - Voltage Code
APA2181 HA:
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-020D 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
PGND
_
GND
V
DD
V
SDN
V
SS
V
OUT
V
CPP
V
CPN
T
J
T
STG
PGND to GND Voltage
(Note 1)
Rating
-0.3 to 0.3
-0.3 to 5.5
GND-0.3 to V
DD
+0.3
-5.5 to 0.3
V
SS
-0.3 to V
DD
+0.3
PGND-0.3 to V
DD
+0.3
PV
SS
-0.3 to PGND+0.3
150
-65 to +150
2
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o
Parameter
Unit
Supply Voltage (VDD to GND and PGND)
Input Voltage (SDN to GND)
VSS to GND and PGND Voltage
ROUT and LOUT to GND Voltage
CPP to PGND Voltage
CPN to PGND Voltage
Maximum Junction Temperature
Storage Temperature Range
V
C
Copyright
©
ANPEC Electronics Corp.
Rev. A.2 - Apr., 2010
APA2181
Absolute Maximum Ratings (Cont.)
Symbol
T
SDR
P
D
Parameter
Maximum Soldering Temperature Range, 10 Seconds
Power Dissipation
(Note 1)
Rating
260
Internally Limited
Unit
o
C
W
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
Thermal Characteristics
Symbol
θ
JA
Parameter
Thermal Resistance - Junction to Ambient
(Note 2)
Typical Value
WLCSP1.6x1.6-12
160
Unit
O
C/W
Note 2: Please refer to “Thermal Pad Consideration”. 2 layered 5 in2 printed circuit boards with 2oz trace and copper through several
thermal vias. The thermal pad is soldered on the PCB.
Recommended Operating Conditions
Symbol
V
DD
V
IH
V
IL
T
A
T
J
R
L
Supply Voltage
High Level Threshold Voltage
Low Level Threshold Voltage
Operating Ambient Temperature Range
Operating Ambient Temperature Range
Headphone Resistance
SDN
SDN
Parameter
Range
2.3 ~ 5.5
1.0 ~ V
DD
0 ~ 0.35
-40 ~ 85
-40 ~ 125
16 ~ 100k
Ο
Unit
V
C
Ω
Electrical Characteristics
V
DD
=3.6V, V
GND
=V
PGND
=0V, V
SDN
=V
DD
, C
CPF
=C
CPO
=1µF, C
i
=1µF, T
A
=25 C (unless otherwise noted)
Symbol
I
DD
I
SD
I
I
Parameter
V
DD
Supply Current
V
DD
Shutdown Current
Input current
V
SDN
=0V
SDN
Test Conditions
Min.
-
-
-
APA2181
Typ.
1
5
0.1
Max.
2
10
-
mA
µA
Unit
o
CHARGE PUMP
f
OSC
R
eq
DRIVERS
A
V
△A
V
R
i
R
f
V
SR
V
OS
V
N
Internal Voltage Gain
Gain Matching
Input Resistance
Feedback Resistance
Slew Rate
Output Offset Voltage
Output Noise
V
DD
=2.3V to 5.5V, R
L
= 16Ω
No Load
-1.55
-
12
17
-
-8
-
-1.5
1
14
21
2.5
-
27
-1.45
2
16
25
-
8
-
kΩ
V/µs
mV
µVrms
V/V
%
Switching Frequency
Equivalent Resistance
400
-
500
15
600
18
kHz
Ω
Copyright
©
ANPEC Electronics Corp.
Rev. A.2 - Apr., 2010
3
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APA2181
Electrical Characteristics (Cont.)
V
DD
=3.6V, V
GND
=V
PGND
=0V, V
SDN
=V
DD
, C
CPF
=C
CPO
=1µF, C
i
=1µF, T
A
=25 C (unless otherwise noted)
Symbol
DRIVERS (CONT.)
V
DD
=2.3V to 5.5V, V
rr
=200mVrms
f
in
= 217Hz
f
in
= 1kHz
f
in
= 20kHz
-80
-80
-40
400
4
8
50
60
70
80
0.03
0.03
0.20
85
85
70
95
-60
-60
-35
-
-
-
-
mW
-
-
Parameter
Test Conditions
Min.
APA2181
Typ.
Max.
Unit
o
PSRR
Power Supply Rejection Ratio
-
dB
C
L
T
start-up
V
ESD
Maximum Capacitive Load
Start-up Time
ESD Protection
OUTR, OUTL
THD+N=1%, f
in
=1kHz
R
L
=16Ω
R
L
=32Ω
THD+N=10%, f
in
=1kHz
R
L
=16Ω
R
L
=32Ω
P
O
=20mW, R
L
=32Ω
f
in
=20Hz
f
in
=1kHz
f
in
=20kHz
P
O
=40mW, R
L
=32Ω,
f
in
=20Hz
f
in
=1kHz
f
in
=20kHz
V
DD
=5V, P
O
=140mW, R
L
=32Ω,
With A-weighting Filter
-
-
-
pF
ms
kV
P
O
Output Power (Stereo, In
Phase)
45
THD+N
Total Harmonic Distortion
Plus Noise
-
-
%
Crosstalk
Channel Separation
75
-
dB
-
S/N
Signal to Noise Ratio
-
LDO (LOW DROP-OUT REGULATOR)
V
O
I
O
I
LIM
I
SC
PSRR
Output Voltage Accuracy
Output Current
Current-Limit
Short Circuit Current-Limit
Power Supply Rejection Ratio
I
O
=1mA, f
in
=1kHz
Over Temp & Over Load Current
-
5
30
6
-
±5
-
40
8
40
-
-
50
10
-
dB
mA
%
Copyright
©
ANPEC Electronics Corp.
Rev. A.2 - Apr., 2010
4
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APA2181
Typical Operating Characteristics
THD+N vs. Output Power
10
10
THD+N vs. Output Power
THD+N (%)
0.1
f
in
=1kHz
f
in
=20Hz
V
DD
=4.2V
R
L
=16Ω
C
in
=1µF
BW<80kHz
Stereo, in Phase
THD+N (%)
1
f
in
=20kHz
1
f
in
=20kHz
0.1
f
in
=1kHz
f
in
=20Hz
V
DD
=3.6V
R
L
=16Ω
C
in
=1µF
BW<80kHz
Stereo, in Phase
0.01
0
50m
100m
150m
Output Power (mW)
200m
0.01
0
25m
50m
75m
100m
Output Power (mW)
125m
THD+N vs. Output Power
10
10
THD+N vs. Output Power
THD+N (%)
0.1
f
in
=1kHz
f
in
=20Hz
V
DD
=2.8V
R
L
=16Ω
C
in
=1µF
BW<80kHz
Stereo, in Phase
THD+N (%)
1
f
in
=20kHz
1
f
in
=20kHz
0.1
f
in
=1kHz
f
in
=20Hz
V
DD
=4.2V
R
L
=32Ω
C
in
=1µF
BW<80kHz
Stereo, in Phase
0.01
0
15m
30m
45m
60m
Output Power (mW)
75m
0.01
0
50m
100m
150m
Output Power (mW)
200m
THD+N vs. Output Power
10
10
THD+N vs. Output Power
THD+N (%)
1
f
in
=20kHz
0.1
f
in
=1kHz
f
in
=20Hz
V
DD
=3.6V
R
L
=32Ω
C
in
=1µF
BW<80kHz
Stereo, in Phase
THD+N (%)
1
f
in
=20kHz
0.1
f
in
=1kHz
0.01
0
f
in
=20Hz
V
DD
=2.8V
R
L
=16Ω
C
in
=1µF
BW<80kHz
Stereo, in Phase
50m
75m
100m
25m
Output Power (mW)
125m
0.01
0
15m
30m
45m
60m
Output Power (mW)
75m
Copyright
©
ANPEC Electronics Corp.
Rev. A.2 - Apr., 2010
5
www.anpec.com.tw
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