ETC AUD4886

AUD4886
2 x 2W Stereo Audio Amplifier with Shutdown
General Description
Key Specifications
The AUD4886 is a stereo audio power amplifier essentially
designed for communication purpose such as mobile phone
and other portable devices. It can deliver 1 watt, per channel,
of continuous average power to an 8 Ohm BTL load. There is
less than 1% distortion from a 5V DC power supply.
The AUD4886 were specifically designed to provide high
quality output power with a minimal amount of external
components. It requires no output coupling capacitors, for
this reason, it is perfectly meet the needs of mobile phone
and other low voltage applications where require the
consumption of power in the smallest amount.
Features
The AUD4886 allows shutdown control on each channel, if
both shutdown control pin is being driven to logic low, a low
power consumption shutdown mode will be activated.
Additionally, the AUD4886 features an internal thermal
shutdown protection mechanism.
The AUD4886 has an advanced pop & click circuitry that
eliminates the noise during turning on and turning off of the
device.
Wide Power Supply
Voltage Range
Typical THD at 1W, 8Ω, 1kHz
High PSRR
Low Quiescent Current
2.7V < VDD < 5.5V
0.2% (typ)
64 dB (typ)
2.5 mA per ch (typ)
Space Saving Thermal Package
Ultra Low Current Shutdown
Mode
External Gain Configuration
Unity-gain stable
Can drive CL up to 200pF
Applications
Mobile Phones
PDAs
Notebook Computers
Portable electronic devices
Typical Application
V DD
CS
1.0µF
RF
20kΩ
Ri
20kΩ
- IN
+ IN
Ci
0.39µF
_
V O1 -
+
20kΩ
20kΩ
VIL
_
CB
1.0µF
BIAS
V IH
ShutDown
Shutdown
Control
ShutDown
V O1 +
+
V DD /2
V IH
+
A V = -1
_
V O2 +
Bypass
CB
1.0µF
Audio
Input
A V = -1
V DD /2
BIAS
Shutdown
Control
V IL
10
RL
8Ω
Bypass
THD + N (%)
Audio
Input
1
RL
8Ω
20kΩ
20kΩ
Ri
20kΩ
+ IN
- IN
Ci
0.39µF
V O2 -
+
_
0.1
GND
10-4
RF
20kΩ
10-2
10-1
100
Output Power (W)
Figure 1 Audio Power Amplifier with AV = 2
http://www.analogexpress.com
10-3
Figure 2 THD + N vs Output Power
1
V1.0
AUD4886 2 x 2W Stereo Audio Amplifier with Shutdown
September 2007
AUD4886 2 x 2W Stereo Audio Amplifier with Shutdown
Pin Assignment
AUD4886D14-4 (Bottom View)
Pin No.
Pin Name
Type
Description
1
IN1 +
I
Channel 1 positive differential input
2
IN1 -
I
Channel 1 negative differential input
3
Vo1 -
O
Channel 1 negative BTL output
4
VDD
I
Power supply
5
Vo2 -
O
Channel 2 negative BTL output
6
IN2 -
I
Channel 2 negative differential input
7
IN2 +
I
Channel 2 positive differential input
8
BYPASS2
I
Channel 2 common mode voltage
9
SD2
I
Channel 2 shutdown selection pin
10
Vo2 +
O
Channel 2 positive BTL Output
11
GND
I
Ground
12
Vo1 +
O
Channel 1 positive BTL Output
13
SD1
I
Channel 1 shutdown selection pin
14
BYPASS1
I
Channel 1 common mode voltage
Operation Conditions
Parameter
Symbol
Min
Power Supply Voltage
VDD
Operating Temperature Range
TA
Typ
Max
Unit
2.7
5.5
V
-40
85
°C
Ordering Information
+
Part Number
Package
Marking
AUD4886D14-4
14-lead DFN 4x3
A4886D WXYZ
+ WXYZ = assembly and date code
V1.0
2
http://www.analogexpress.com
If Military/Aerospace specified devices are required,
please contact the Analog Express Sales Office/Distributors
for availability and specifications.
Supply Voltage
Storage Temperature
Input Voltage
Power Dissipation
ESD Susceptibility
Junction Temperature
6.0V
-65°C to +150°C
-0.3V to VDD + 0.3V
Internally Limited
HBM 2000V
150°C
Thermal Resistance
θJC (DFN14 4x3)
θJA (DFN14 4x3)
63°C/W
12°C/W
Electrical Characteristics, VDD = 5V
The following specifications apply for the circuit shown in Figure 1, unless otherwise specified. Limits apply for TA = 25°C.
AUD4886
Symbol
Parameter
IDD
Quiescent Power Supply Current
per channel
ISD
Shutdown Current
VOS
Output Offset Voltage (absolute)
ROUT
Resistor Output to GND
PO
Output Power (8Ω)
(4Ω)
Conditions
Typical
Limit
Units
(Limits)
VIN = 0V, IO = 0A, No Load
2.5
14
mA (max)
VIN = 0V, IO = 0A, 8Ω Load
3.5
16
mA (max)
VSD = VSD Mode
-
3
µA (max)
30
mV (max)
9.7
kΩ (max)
7.0
kΩ (min)
8.5
THD+N = 1% (max); f = 1kHz
THD+N = 10% (max); f = 1kHz
THD+N = 1% (max); f = 1kHz
THD+N = 10% (max); f = 1kHz
1.3
1.6
2
2.6
W
TWU
Wake-up time
THD+N
Total Harmonic Distortion+Noise
PO = 0.5W; f = 1kHz; RL = 8Ω
PO = 0.5W; f = 1kHz; RL = 4Ω
0.2
0.3
%
Xtalk
Crosstalk
PO = 0.5W; f = 1kHz
-80
dB
PSRR
Power Supply Rejection Ratio
VRIPPLE = 200mV sine p-p
Input terminated with 10Ω
-61 (217Hz)
-64 (1kHz)
dB
Efficiency
η
VDD = 5.0V, PO = 1W
63
%
http://www.analogexpress.com
100
W
3
300
ms
V1.0
AUD4886 2 x 2W Stereo Audio Amplifier with Shutdown
Absolute Maximum Ratings
AUD4886 2 x 2W Stereo Audio Amplifier with Shutdown
Electrical Characteristics, VDD = 3.7V
The following specifications apply for the circuit shown in Figure 1, unless otherwise specified. Limits apply for TA = 25°C.
AUD4886
Symbol
IDD
Parameter
Quiescent Power Supply Current
Per channel
ISD
Shutdown Current
VOS
Output Offset Voltage
Output Power (8Ω)
PO
(4Ω)
Conditions
Units
(Limits)
Typical
Limit
VIN = 0V, IO = 0A, No Load
3
12
mA (max)
VIN = 0V, IO = 0A, 8Ω Load
4
15
mA (max)
VSD = VSD Mode
-
2
µA (max)
30
mV (max)
THD+N = 1% (max); f = 1kHz
THD+N = 10% (max); f = 1kHz
THD+N = 1% (max); f = 1kHz
THD+N = 10% (max); f = 1kHz
PO = 0.5W; f = 1kHz; RL = 4Ω
PO = 0.5W; f = 1kHz; RL = 8Ω
0.65
0.8
1
1.5
0.2
0.3
W
W
THD+N
Total Harmonic Distortion+Noise
%
Xtalk
Crosstalk
PO = 0.5W; f = 1kHz
-80
dB
PSRR
Power Supply Rejection Ratio
VRIPPLE = 200mV sine p-p
Input terminated with 10Ω
-61 (217Hz)
-63 (1kHz)
dB
Efficiency
η
VDD = 5.0V, PO = 1W
63
%
Electrical Characteristics, VDD = 3V
The following specifications apply for the circuit shown in Figure 1, unless otherwise specified. Limits apply for TA = 25°C.
AUD4886
Symbol
IDD
Parameter
Quiescent Power Supply Current
Per channel
ISD
Shutdown Current
VOS
Output Offset Voltage
Output Power (8Ω)
PO
(4Ω)
Conditions
Units
(Limits)
Typical
Limit
VIN = 0V, IO = 0A, No Load
3.5
12
mA (max)
VIN = 0V, IO = 0A, 8Ω Load
4.5
15
mA (max)
VSD = VSD Mode
-
2
µA (max)
30
mV (max)
THD+N = 1% (max); f = 1kHz
THD+N = 10% (max); f = 1kHz
THD+N = 1% (max); f = 1kHz
THD+N = 10% (max); f = 1kHz
PO = 0.3W; f = 1kHz; RL = 8Ω
PO = 0.5W; f = 1kHz; RL = 4Ω
0.4
0.5
0.6
0.8
0.2
0.2
W
W
THD+N
Total Harmonic Distortion+Noise
Xtalk
Crosstalk
PO = 0.3W; f = 1kHz
-80
dB
PSRR
Power Supply Rejection Ratio
VRIPPLE = 200mV sine p-p
Input terminated with 10Ω
-61 (217Hz)
-63 (1kHz)
dB
Efficiency
η
VDD = 5.0V, PO = 1W
63
%
V1.0
4
%
http://www.analogexpress.com
Shutdown Control
In order to reduce the power consumption while device is not in use, there is shutdown circuitry employed to switch off the
amplifier bias of each channel. By applying a logic low signal to shutdown pin of selected channel, the related bias circuitry
will be switched off to minimize the current draw. While the device may be disabled with shutdown voltages in between
ground and supply, the idle current may be greater than the typical value. To avoid unwanted state changes, the shutdown
pin should be tied to a definite voltage.
In many applications, output signal from a microcontroller is used to control the shutdown circuitry, which provides a quick,
smooth transition to shutdown. Another solution is to use a single-throw switch in conjunction with an external resistor
(pull-up or pull-down, depending on shutdown mode selection). This scheme guarantees that the shutdown pin will not float,
thus preventing unwanted state changes.
Selection of External Components
The external components will be the one of the important factor to affect the amplifier performance, proper selection on
them will allow system function in more efficiency way. The AUD4886 should be used in low gain configurations to minimize
THD+N values, and maximize the signal to noise ratio. Besides gain, another major consideration in system performance is
the closed loop bandwidth of the amplifier. To a large extent, the bandwidth is dictated by the choice of external
components.
The input coupling capacitor forms a first order high pass filter, which limits low frequency response, and should be chosen
based on needed frequency response for a few distinct reasons. In many cases the speakers used in portable systems,
whether internal or external, have little ability to reproduce signals below 100Hz to 150Hz. Thus, using a large input
capacitor may not increase actual system performance.
Besides minimizing the input capacitor size, careful consideration should be paid to the bypass capacitor value. It will
determine how fast the chip turns on.
Power Dissipation
The maximum internal power dissipation pre channel is 4 times that of a single-ended amplifier. The maximum power
dissipation for a given application can be derived from the power dissipation graphs or from equation listed below.
2
2
PDMAX = 4*(VDD) /(2π RL)
It is critical that the maximum junction temperature TJMAX of 150°C is not exceeded. TJMAX is a function of PDMAX and the PC
board foil area. By adding copper foil, the thermal resistance of the application can be reduced from the free air value of θJA,
resulting in higher PDMAX values without thermal shutdown protection circuitry being activated. Additional copper foil can be
added to any of the leads connected to the AUD4886.
http://www.analogexpress.com
5
V1.0
AUD4886 2 x 2W Stereo Audio Amplifier with Shutdown
Application Information
THD+N vs Output Power
VDD = 5V, RL = 4Ω, and f = 1kHz
THD+N vs Output Power
VDD = 5V, RL = 8Ω, and f = 1kHz
10
THD + N (%)
THD + N (%)
10
1
1
0.1
10-4
10-3
10-2
10-1
0.1 -3
10
100
10-2
THD+N vs Output Power
VDD = 3.7V, RL = 8Ω, and f = 1kHz
100
THD+N vs Output Power
VDD = 3.7V, RL = 4Ω, and f = 1kHz
10
10
THD + N (%)
THD + N (%)
10-1
Output Power (W)
Output Power (W)
1
1
0.1
10-4
10-3
10-2
10-1
0.1 -3
10
100
10-2
Output Power (W)
10-1
100
Output Power (W)
THD+N vs Output Power
VDD = 3V, RL = 8Ω, and f = 1kHz
THD+N vs Output Power
VDD = 3V, RL = 4Ω, and f = 1kHz
10
10
THD + N (%)
THD + N (%)
AUD4886 2 x 2W Stereo Audio Amplifier with Shutdown
Typical Performance Characteristics
1
1
0.1
10-4
10-3
10-2
10-1
0.1 -3
10
100
Output Power (W)
V1.0
10-2
10-1
100
Output Power (W)
6
http://www.analogexpress.com
AUD4886 2 x 2W Stereo Audio Amplifier with Shutdown
Typical Performance Characteristics
THD+N vs Output Power
VDD = 2.7V, RL = 4Ω, and f = 1kHz
THD+N vs Output Power
VDD = 2.7V, RL = 8Ω, and f = 1kHz
10
THD + N (%)
THD + N (%)
10
1
1
0.1
10-4
10-3
10-2
10-1
0.1 -3
10
100
10-2
Output Power (W)
THD + N vs Frequency
VDD = 5V, PO=250mW, RL = 8Ω
10
THD + N (%)
THD + N (%)
1
0.1
1
0.1
102
103
104
0.01 1
10
105
102
Frequency (Hz)
104
105
THD + N vs Frequency
VDD = 5V, PO=1W, RL = 4Ω
10
THD + N (%)
10
THD + N (%)
103
Frequency (Hz)
THD + N vs Frequency
VDD = 5V, PO=500mW, RL = 4Ω
1
0.1
0.01 1
10
100
THD + N vs Frequency
VDD = 5V, PO=500mW, RL = 8Ω
10
0.01 1
10
10-1
Output Power (W)
1
0.1
102
103
104
0.01 1
10
105
Frequency (Hz)
http://www.analogexpress.com
102
103
104
105
Frequency (Hz)
7
V1.0
THD + N vs Frequency
VDD = 3.7V, PO=500mW, RL = 4Ω
THD + N vs Frequency
VDD = 3.7V, PO=500mW, RL = 8Ω
10
THD + N (%)
THD + N (%)
10
1
0.1
1
0.1
0.01 1
10
102
103
104
0.01 1
10
105
102
103
Frequency (Hz)
105
THD + N vs Frequency
VDD = 3V, PO=500mW, RL = 4Ω
10
THD + N (%)
10
THD + N (%)
104
Frequency (Hz)
THD + N vs Frequency
VDD = 3V, PO=250mW, RL = 8Ω
1
0.1
1
0.1
0.01 1
10
102
103
104
0.01 1
10
105
102
103
Frequency (Hz)
104
105
Frequency (Hz)
Output Power Vs VDD
RL = 8 Ω
Output Power Vs VDD
RL = 4 Ω
4
3
Output Power (W)
3
Output Power (W)
AUD4886 2 x 2W Stereo Audio Amplifier with Shutdown
Typical Performance Characteristics
2
THD + N = 10%
1
THD + N = 10%
2
THD + N = 1%
1
THD + N = 1%
0
1
2
3
4
5
6
0
VDD (V)
V1.0
1
2
3
4
5
6
VDD (V)
8
http://www.analogexpress.com
AUD4886 2 x 2W Stereo Audio Amplifier with Shutdown
Typical Performance Characteristics
Cross-talk vs Frequency
VDD = 3.3V, RL = 8Ω, and PO = 0.5W
0
0
-20
-20
-40
-40
Gain (dB)
Gain (dB)
Cross-talk vs Frequency
VDD = 5V, RL = 8Ω, and PO = 1W
-60
-80
-100 0
10
-60
-80
101
102
103
-100 0
10
104
101
Frequency (Hz)
102
103
104
Frequency (Hz)
Closed-Loop Frequency Response
VDD = 5.5V, Av = 2
Closed-Loop Frequency Response
VDD = 5.5V, Av = 2
180
10
Gain (dB)
Phase (DEG)
120
60
0
-60
-120
0 0
10
101
102
103
104
-180 0
10
105
101
102
Frequency (Hz)
104
105
Power Supply Rejection Ratio (PSRR) vs Frequency
VDD = 5V, RL = 8Ω, and Input Floating
0
0
-20
-20
Gain (dB)
Gain (dB)
Power Supply Rejection Ratio (PSRR) vs Frequency
VDD = 5V, RL = 8Ω, and Input terminated with 10Ω
-40
-40
-60
-60
-80 1
10
103
Frequency (Hz)
102
103
-80 1
10
104
http://www.analogexpress.com
102
103
104
Frequency (Hz)
Frequency (Hz)
9
V1.0
Power Supply Rejection Ratio (PSRR) vs Frequency
VDD = 3.3V, RL = 8Ω, and Input Floating
Power Supply Rejection Ratio (PSRR) vs Frequency
VDD = 3.3V, RL = 8Ω, and Input terminated with 10Ω
0
0
-20
-20
Gain (dB)
Gain (dB)
AUD4886 2 x 2W Stereo Audio Amplifier with Shutdown
Typical Performance Characteristics
-40
-60
-80 1
10
-60
102
103
-80 1
10
104
Frequency (Hz)
V1.0
-40
102
103
104
Frequency (Hz)
10
http://www.analogexpress.com
AUD4886 2 x 2W Stereo Audio Amplifier with Shutdown
Package Dimensions
http://www.analogexpress.com
11
V1.0
AUD4886 2 x 2W Stereo Audio Amplifier with Shutdown
Tape and Reel Drawing
V1.0
12
http://www.analogexpress.com
AUD4886 2 x 2W Stereo Audio Amplifier with Shutdown
LIFE SUPPORT POLICY
ANALOG EXPRESS’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEM WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF ANALOG EXPRESS. As used herein:
1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body,
or (b) 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 a significant injury to the user.
2. A critical component is any component of a life support device or system whose failure to perform can be
reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.
Analog Express Inc.
US Tel: (1) 713 666 9459
HK Tel: (852) 2823 9200
www.analogexpress.com
Email: [email protected]
http://www.analogexpress.com
13
V1.0