PAM8014

PAM8014
3.2W MONO CLASS D AUDIO AMPLIFIER
Description
Pin Assignments
NEW PRODUCT
The PAM8014 is a 3.2W mono filter-less class-D amplifier with high
PSRR and differential input that eliminate noise and RF rectification.
Features like greater than 90% efficiency and small PCB area make
the PAM8014 Class-D amplifier ideal for portable applications. The
output uses a filter-less architecture minimizing the number of
external components and PCB area whilst providing a high
performance, simple and lower cost system.
(Top View)
The PAM8014 features short circuit protection and thermal shutdown.
The PAM8014 is available in U-WLB1313-9 package.
GND
OUT-
A1
A2
A3
VDD
PVDD
B1
B2
IN-
SD
OUT+
C1
C2
C3
PGND
B3
U-WLB1313-9
Features











Ultra Low EMI, -20dB Better Than FCC Class-B @ 300MHz
High Efficiency up to 93% @2W with a 8Ω Speaker
Shutdown Current <1μA
3.2W@10% THD Output with a 4Ω Load at 5V Supply
Demanding Few External Components
Superior Low Noise without Input
Supply Voltage from 2.5V to 5.5 V
Short Circuit Protection
Thermal Shutdown
Available in Space Saving U-WLB1313-9 Package
Totally Lead-Free&Fully RoHS Compliant (Notes 1& 2)

Halogen and Antimony Free. “Green” Device (Note 3)
Notes:
IN+
Applications






Cellular Phones/Smart Phones
MP4/MP3
VOIP
Digital Photo Frame
Electronic Dictionary
Portable Game Machines
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Typical Applications Circuit
VDD
1µF
PVDD
VDD
0.1µF
IN+
OUT+
Audio Input
INOUT-
0.1µF
Shut Down
SD
PGND
PAM8014
Document number: DS38114 Rev. 1 - 2
GND
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January 2016
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Pin Descriptions
NEW PRODUCT
Pin Number
Pin Name
Function
A1
IN+
A2
GND
Positive Differential Input
Ground
A3
OUT-
Negative BTL Output
B1
VDD
Power Supply
B2
PVDD
Power Supply
B3
PGND
Power Ground
C1
IN-
Negative Differential Input
C2
EN
Chip Enable
C3
OUT+
Positive BTL Output
Functional Block Diagram
VDD
RF
IN+
RIN
+
RIN
IN-
PWM
Modulator
-
PVDD
Gate
Drive
OUT+
Gate
Drive
OUT-
RF
EN
EN
Bias and
Vref
OSC
UVLO
SC
Protect
Startup
Protection
OTP
PGND
GND
Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.)
Symbol
VDD
Parameter
Value
Unit
6.0
V
-0.3 to VDD+0.3
V
-65 to +150
°C
+150
°C
Supply Voltage (VDD)
VI
Input Voltage (IN+, IN-, EN)
TS
Storage Temperature
TJ
Maximum Junction Temperature
Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.)
Symbol
Min
Max
Supply Voltage
2.5
5.5
V
TA
Operating Ambient Temperature Range
-25
+85
°C
TJ
Junction Temperature
-40
+125
°C
VDD
Parameter
PAM8014
Document number: DS38114 Rev. 1 - 2
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Unit
January 2016
© Diodes Incorporated
Electrical Characteristics (@TA = +25°C, VDD = 5V, RIN = 0, Gain=18dB, RL = L(33μH)+R+L(33μH), unless otherwise specified.)
Symbol
VDD
Parameter
Test Conditions
Min
Typ
Max
Unit
—
2.5
—
5.5
V
VDD = 5.0V
—
3.2
—
VDD = 3.6V
—
1.6
—
VDD = 5.0V
—
2.45
—
VDD = 3.6V
—
1.3
—
VDD = 5.0V
—
1.8
—
VDD = 3.6V
—
0.95
—
VDD = 5.0V
—
1.40
—
VDD = 3.6V
—
0.72
—
—
0.17
—
—
0.16
—
—
0.14
—
—
0.16
—
Supply Voltage
THD+N = 10%, f = 1kHz, R = 4Ω
THD+N = 1%, f = 1kHz, R = 4Ω
PO
Output Power
NEW PRODUCT
THD+N = 10%, f = 1kHz, R = 8Ω
THD+N = 1%, f = 1kHz, R = 8Ω
VDD = 5.0V, PO = 1W, R = 8Ω
THD+N
Total Harmonic
Distortion Plus
Noise
VDD = 3.6V, PO = 0.1W, R = 8Ω
VDD = 5.0V, PO = 0.5W, R = 4Ω
VDD = 3.6V, PO = 0.2W, R = 4Ω
PSRR
Dyn
VN
f = 1kHz
f = 1kHz
W
W
W
W
%
%
Power Supply Ripple
Rejection
VDD = 3.6V, Input AC-ground with
C = 1μF
f = 217Hz
f = 1kHz
—
—
-75
-75
—
—
dB
Dynamic Range
VDD = 5V, THD = 1%, R = 8Ω
f = 1kHz
—
95
—
dB
Input AC-ground
No A
weighting
A-weighting
—
60
—
—
40
—
—
93
—
—
86
—
Output Noise
RL = 8Ω, THD = 10%
μV
η
Efficiency
IQ
Quiescent Current
VDD = 5V
No Load
—
4
—
ISD
Shutdown Current
VDD = 2.5V to 5V
SD = 0V
—
—
1
μA
RDS(ON)
Static Drain-to-Source
On-State Resistor
High Side PMOS, I = 500mA
VDD = 5.0V
—
200
—
mΩ
Low Side NMOS, I = 500mA
VDD = 5.0V
—
200
—
mΩ
fSW
Switching Frequency
VDD = 2.5V to 5.5V
—
—
250
—
kHz
Gv
Closed-Loop Gain
VDD = 2.5V to 5.5V
—
—
8
—
V/V
RIN
Input Impedance (In
Chip)
VDD = 2.5V to 5.5V
—
—
31
—
KΩ
tON
Turn-on Time
VDD = 2.5V to 5.5V
—
—
32
—
ms
VDD = 2.5V to 5.5V
—
—
+150
—
VDD = 2.5V to 5.5V
—
—
+40
—
OTP
OTH
Over Temperature
Protection
Over Temperature
Hysterisis
f = 1kHz
RL = 4Ω, THD = 10%
Output Offset Voltage
Input AC-ground, VDD = 5V
—
—
—
20
VIH
EN Input High Voltage
VDD = 5V
—
1.4
—
—
VIL
EN Input Low Voltage
VDD = 5V
—
—
—
1.0
Document number: DS38114 Rev. 1 - 2
mA
℃
VOS
PAM8014
%
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mV
V
January 2016
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Performance Characteristics
(@TA = +25°C, VDD = 5V, RIN = 0, Gain = 18dB, RL = L(33μH)+R+L(33μH), unless otherwise
specified.)
THD+N vs. Output Power (VDD=5V, RL=4Ω)
THD+N vs. Output Power (VDD=5V, RL=8Ω)
60
60
f=100Hz /1KHz/10KHz
Red/Blue/Pink
20
NEW PRODUCT
10
20
f=100Hz /1KHz/10KHz
Red/Blue/Pink
10
5
5
2
2
1
1
%
%
0.5
0.5
0.2
0.2
0.1
0.1
0.05
0.05
0.02
0.02
0.01
1m
2m
5m
10m
20m
50m
100m
200m
500m
1
2
0.01
1m
5
2m
5m
10m
20m
50m
W
THD+N vs. Output Power (VDD=3.6V, RL=4Ω)
200m
500m
1
2
3
2
3
THD+N vs. Output Power (VDD=3.6V, RL=8Ω)
60
60
f=100Hz /1KHz/10KHz
Red/Blue/Pink
20
10
20
10
f=100Hz /1KHz/10KHz
Red/Blue/Pink
5
5
2
2
1
1
%
%
0.5
0.5
0.2
0.2
0.1
0.1
0.05
0.05
0.02
0.02
0.01
1m
2m
5m
10m
20m
50m
100m
200m
500m
1
2
0.01
1m
5
2m
5m
10m
20m
50m
THD+N vs. Frequency (VDD=5.0V, RL=4Ω)
500m
1
10
5
5
PO=0.5W /1W/2W
Red/Blue/Pink
2
1
PO=0.3W /0.5W/1W
Red/Blue/Pink
1
0.5
0.5
%
0.2
0.2
0.1
0.1
0.05
0.05
0.02
20
200m
THD+N vs. Frequency (VDD=5.0V, RL=8Ω)
10
2
100m
W
W
%
100m
W
50
100
200
500
1k
2k
5k
10k
20k
0.02
20
Hz
PAM8014
Document number: DS38114 Rev. 1 - 2
50
100
200
500
1k
2k
5k
10k
20k
Hz
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Performance Characteristics
(@TA = +25°C, VDD = 5V, RIN = 0, Gain = 18dB, RL = L(33μH)+R+L(33μH), unless otherwise
specified.)
PSRR vs. Frequency (VDD=5.0V, RL=8Ω)
+0
+0
-10
-10
-20
-20
-30
-30
-40
d
B
-40
d
B
-50
-50
-60
-60
-70
-70
-80
-80
-90
-90
-100
20
-100
20
50
100
200
500
1k
2k
5k
10k
20k
50
100
200
500
Hz
1k
2k
5k
10k
20k
Hz
Frequency Response
Noise Floor
+20
+0
+19.75
-10
+19.5
CIN=1μF
+19.25
-20
+19
-30
+18.75
+18.5
-40
+18.25
+18
d
B
r
A
+17.75
+17.5
+17.25
d
B
r
-50
A
-70
-60
+17
-80
+16.75
+16.5
-90
+16.25
-100
+16
+15.75
-110
+15.5
+15.25
-120
20
+15
20
50
100
200
500
1k
2k
5k
10k
50
100
200
500
1k
2k
5k
10k
20k
Hz
20k
Hz
Efficiency vs. Output Power (VDD=5.0V, RL=4Ω)
Efficiency vs. Output Power (VDD=5.0V, RL=8Ω)
100
100
90
80
70
60
% 50
40
30
20
10
0
80
60
%
40
20
1800
1500
1300
1000
800
500
300
200
150
100 300 500 700 1000 1300 2000 3000
100
50
80
10
50
0
10
NEW PRODUCT
PSRR vs. Frequency (VDD=5.0V, RL=4Ω)
Output Power--mW
Output Power--mW
PAM8014
Document number: DS38114 Rev. 1 - 2
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Application Information
Close Loop Gain (GV)
The close loop gain is set by the ratio of the input resistance RIN and feedback resistance RF(refer to block diagram), and the close loop gain
equation is as follow:
Which RF is set at 124KΩ and RIN is 31KΩ, the GV default is 8V/V, which is 18dB.
NEW PRODUCT
Input Capacitors (CIN)
In the typical application, an input capacitor, CIN, is required to allow the amplifier to bias the input signal to the proper DC level for optimum
operation. In this case, CIN and the input impedance RIN form is a high-pass filter with the corner frequency determined in the follow equation:
It is important to consider the value of CIN as it directly affects the low frequency performance of the circuit. For example, when R IN is 31kΩ and
the specification calls for a flat bass response are down to 150Hz. Equation is reconfigured as followed:
When input resistance variation is considered, the CIN is 7nF, so one would likely choose a value of 10nF. A further consideration for this capacitor
is the leakage path from the input source through the input network CIN, RIN and feedback resistor RF to the load. This leakage current creates a
DC offset voltage at the input to the amplifier that reduces useful headroom, especially in high gain applications. For this reason, a low-leakage
tantalum or ceramic capacitor is the best choice. When polarized capacitors are used, the positive side of the capacitor should face the amplifier
input in most applications as the DC level is held at V DD/2, which is likely higher than the source DC level. Please note that it is important to
confirm the capacitor polarity in the application.
Decoupling Capacitor (CS)
The PAM8014 is a high-performance CMOS audio amplifier that requires adequate power supply decoupling to ensure the output total harmonic
distortion (THD) as low as possible. Power supply decoupling also prevents the oscillations causing by long lead length between the amplifier and
the speaker.
The optimum decoupling is achieved by using two different types of capacitors that target on different types of noise on the power supply leads.
For higher frequency transients, spikes, or digital hash on the line, a good low equivalent-series-resistance (ESR) ceramic capacitor, typically 1μF,
is placed as close as possible to the device VDD pin for the best operation. For filtering lower frequency noise signals, a large ceramic capacitor of
10μF or greater placed near the audio power amplifier is recommended.
How to Reduce EMI
Most applications require a ferrite bead filter for EMI elimination shown at Figure 1. The ferrite filter reduces EMI around 1MHz and higher. When
selecting a ferrite bead, choose one with high impedance at high frequencies, but low impedance at low frequencies.
Ferrite Bead
OUT+
200pF
Ferrite Bead
OUT-
200pF
Figure 1. Ferrite Bead Filter to Reduce EMI
PAM8014
Document number: DS38114 Rev. 1 - 2
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Application Information (Cont.)
Shutdown Operation
In order to reduce power consumption while not in use, the PAM8014 contains shutdown circuitry amplifier off when logic low is placed on the EN
pin. By switching the shutdown pin connected to GND, the PAM8014 supply current draw will be minimized in idle mode.
Under Voltage Lock-out (UVLO)
The PAM8014 incorporates circuitry designed to detect low supply voltage. When the supply voltage drops to 2.0V or below, the PAM8014 goes
into a state of shutdown, and the device comes out of its shutdown state and restore to normal function only when V DD higher than 2.2V.
NEW PRODUCT
Short Circuit Protection (SCP)
The PAM8014 has short circuit protection circuitry on the outputs to prevent the device from damage when output-to-output shorts or output-toGND shorts occur. When a short circuit occurs, the device immediately goes into shutdown state. Once the short is removed, the device will be
reactivated.
Over Temperature Protection (OTP)
Thermal protection on the PAM8014 prevents the device from damage when the internal die temperature exceeds +150°C. There is a +15°C
tolerance on this trip point from device to device. Once the die temperature exceeds the set point, the device will enter the shutdown state and the
outputs are disabled. This is not a latched fault. The thermal fault is cleared once the temperature of the die decreased by +40°C. This large
hysteresis will prevent motor boating sound well and the device begins normal operation at this point with no external system interaction.
POP and Click Circuitry
The PAM8014 contains circuitry to minimize turn-on and turn-off transients or “click and pops”, where turn-on refers to either power supply turn-on
or device recover from shutdown mode. When the device is turned on, the amplifiers are internally muted. An internal current source ramps up the
internal reference voltage. The device will remain in mute mode until the reference voltage reach half supply voltage, 1/2 V DD. As soon as the
reference voltage is stable, the device will begin full operation. For the best power-off pop performance, the amplifier should be set in shutdown
mode prior to removing the power supply voltage.
Ordering Information (Note 4)
PAM8014 X X X
Note:
Pin Configuration
Package
Packing
A: 9 Pin
Z: U-WLB1313-9
R: Tape & Reel
Part Number
Package
PAM8014AZR
U-WLB1313-9
7” Tape and Reel
Quantity
Part Number Suffix
3000/Tape & Reel
-7
4. For packaging details, go to our website at http://www.diodes.com/products/packages.html.
PAM8014
Document number: DS38114 Rev. 1 - 2
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© Diodes Incorporated
Marking Information
NEW PRODUCT
PAM8014- U-WLB1313-9
BJ: Product Code
Y: Year 0~9
W: Week: A~Z: 1~26 weeks;
a~z: 27~52 weeks; z
represents 52 and 53
weeks.
Package Outline Dimensions
Please see AP02001 at http://www.diodes.com/_files/datasheets/ap02001.pdf for the latest version.
U-WLB1313-9
D
9x-Ø b
Da
Pin #1 ID
U-WLB1313-9
Ea
E
e
e
A2
A1
Dim
Min
Max
Typ
A
0.500 0.600 0.550
A1
0.185 0.235 0.210
A2
0.315 0.365 0.340
b
0.208 0.308 0.258
D
1.240
--Da
0.750 0.850 0.800
E
1.240
--Ea
0.750 0.850 0.800
e
0.400 BSC
All Dimensions in mm
A
SEATING PLANE
PAM8014
Document number: DS38114 Rev. 1 - 2
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Suggested Pad Layout
Please see AP02001 at http://www.diodes.com/_files/datasheets/ap02001.pdf for the latest version.
U-WLB1313-9
D (9x)
C1
NEW PRODUCT
Dimensions
C
C1
C2
D
C2
Value
(in mm)
0.400
0.800
0.800
0.258
C
C
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
(AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).
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Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express
written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
A. Life support devices or systems are devices or systems which:
1. are intended to implant into the body, or
2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the
labeling can be reasonably expected to result in significant injury to the user.
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failure of the life support device or to affect its safety or effectiveness.
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representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems.
Copyright © 2016 Diodes Incorporated
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PAM8014
Document number: DS38114 Rev. 1 - 2
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