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PDF MC4066 Data sheet ( Hoja de datos )
| Número de pieza | MC4066 | |
| Descripción | 1.3 W Stereo Class AB Audio Power Amplifier | |
| Fabricantes | MegaPower | |
| Logotipo |  |
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MC4066
1.3 W Stereo Class AB Audio Power Amplifier
General Description
The MC4066 is a 1.3W bridge-connected dual
audio power amplifier , when supplied with 5V
voltage,the MC4066 can deliver 1.3W to a 8Ω
load with the THD+N rate lower than 1.0%.
The dual audio power amplifier design of
MC4066 provides high quality dual-channel
output while requiring few external components
and consumingvery little PCB space.
The MC4066’s power-saving feature is another
plus tailored for handheld device. When the
power-saving mechanism is activated, only
0.04μA current is running on the MC4066. Other
features such as thermal shutdown protection
and “click and pops” reduction during power-up
ensure the safety and reliability in real
applications.
The MC4066 is available in a 3mm*3mm*0.75mm
16-pin QFN package
Function Block Diagram
Features
PO at 1% THD+N, VDD = 5V
RL = 8 Ω 1.3W (typ)
2.7-5.5V operation
0.04μA ultra low current shutdown mode
Suppress pop & click circuitry
PSRR @ 217Hz:70dB(TYP)
Thermal shutdown protection
RoHS compliant and 100% lead(Pb)-free
Applications
PAD,GPS
Mobile Phones
Notebook,EPC
Portable Electronis devices
2 , 11
VDD
5,6,7,13,14 ,16
GND
15
SHUTDOWN
Power&Depop
Circuit
Shutdown
Circuit
4 INA
8 Bias Voltage
Generator
9 INB
- -OUTA 3
+
+OUTA 1
-
+
+
-
+OUTB 12
+
- -OUTB 10
Figure1.
www.megapower.com.cn
1
Jan,2010 Rev 1.0
Free Datasheet http://www.Datasheet4U.com
1 page  
MC4066
1.3 W Stereo Class AB Audio Power Amplifier
Electrical Characteristics(5V)
( VDD= 5V, TA = 25°C unless otherwise noted )
Symbol
Parameter
IDD
Quiescent power supply current
V IN=0V,Io=0 A
ISD
Shutdown current
GND applied to the shutdown pin
VIH Shutdown input voltage high
VIL Shutdown input voltage low
TWU
Turn on time
1uF bypass cap(C4)
Output offset voltage
Vos
V IN=0V
THD+N=1% , f=1 kH z
RL =8Ω
Output power
Po THD+N=10% , f=1k Hz
RL =8Ω
THD+N
Total harmonic Distortion+noise
1K H z, Avd= 2
RL=8Ω , Po= 0.7W
PSRR
X talk
Input unterminated 217Hz, RL=8Ω
V ripple= 200m V p-p C4= 1uF,
Input unterminated 1KHz, RL=8Ω
Power Supply V ripple= 200m V p-p C4 =1 uF,
Rejection ratio Input grounded 217Hz, RL=8Ω
V ripple= 200m V p-p C4 =1 uF,
Input grounded 1KHz, RL=8Ω
V ripple= 200m V p-p C4 =1 uF,
Channel separation
f=1K H z, C4 = 1uF
Min.
0.7
1.1
Typ.
6.0
0.04
1.2
1
100
Max.
10
1.0
1.5
5
1.3
1.6
0.06
70
60
70
65
80
Unit
mA
uA
V
V
ms
mV
W
W
%
dB
dB
dB
dB
dB
www.megapower.com.cn
5
Jan,2010 Rev 1.0
Free Datasheet http://www.Datasheet4U.com
5 Page 
MC4066
1.3 W Stereo Class AB Audio Power Amplifier
Components
Proper external components are essential for
building up an MC4066 system.Although the
MC4066 can function well with various external
component combinations,most optimized
performance and cost are achieved only with
careful selection.
The MC4066 is unity-gain stable which provides
wide design feasibility for designers.The gain is
set to meet individual application requirements
but no higher in order to get minimum THD+N
and maximum Signal-Noise Ratio(SNR).
However,lower gain demands input signals with
greater voltage swings to achieve maximum
output power.Fortunately,many signal sources
such as CODECs have outputs of 1VRMS
(2.83VP-P).
Input Capacitor
High value input coupling capacitors(C1,C2 ) are
required to amplifying the low inputting audio
signal as illustrated in Figure 1.However,high
value capacitor can be expensive in cost and big
in size which may become a fatal issue for
handheld devices.Besides,the speakers in
handheld and portable devices,either internal or
external,seldom reproduce signals below
150Hz.Therefore,big input capacitor has very
little influence in output signal quality in
applications using limited frequency response
speakers.
Besides the cost and size,C1 and C2 also
influence the click and pop performance.When
the supply voltage is fed in,a transient(pop) is
generated as the charge on the input capacitor
changes from 0 to a quiescent state.The
magnitude of the pop is proportional to the input
capacitance.The higher the capacitance is,the
more time it requires to reach quiescent DC
voltage(usually 0.5VDD) when charged with a
fixed current.The amplifier output charges the
input capacitor through the feedback resistirs
(R2,R4).Therefore,pops can be minimized with
input capacitance no higher than necessary to
provide -3dB frequency.
R1 and R3 are input resistors.C1 and C2
produce -3dB high pass filter cutoff frequency as
stated in Equation(6).
f-3dB=1/(2πRINCIN)=1/(2πR1C1) (6)
Bypass Capacitor
Bypass capacitor determines the time needed
for setting MC4066 to quiescent operation and
plays an important role in minimizing turn-on
pops.The slower the output ramp to quiescent
DC voltage(0.5VDD nominal),the smaller the
turn-on pop is.The relationship between the
capacitance and turn-on time is listed in the table
below.In Figure 1,C4 is a 1.0uF bypass capacitor
which,altogether with C1,minimizes the pops
and clicks.
C4
0.01uF
0.1uF
0.22uF
0.47uF
1.0uF
TON
38ms
40ms
50ms
70ms
100ms
Micro-Power Shutdown
The MC4066’s power saving scheme is realized
through the SHUTDOWN pin and the voltage
applied on it.The micro-power shutdown is
performed to turn off the amplifier’s bias circuitry
as long as the SHUTDOWN pin is grounded.
Typically,current as low as 0.04uA can be
achieved by applying a votage close to GND to
the SHUTDOWN pin.
The Micro-Power shutdown can be initiated and
controlled by either a single-pole,single-throw
switch,or a microprocessor,or a microcontroller.
A switch is employed in the reference design
illustrated in Figure 1.Connect an external 100k
resistor between the SHUTDOWN pin and the
ground;connect the switch between the
SHUTDOWN pin and VDD. Closing the switch
sets the amplifier in normal function,while
opening the switch sets the SHUTDOWN pin to
ground through the 100k resistor and
consequently actives the shutdown. The switch
and resistor design guarantees that the
SHUTDOWN pin is not float to prevent unwanted
state changes.In digital systems, where
mircoprocessoes or microcontrollers are
deployed,digital output can be applied to control
the SHUTDOWN input voltage.
www.megapower.com.cn
11
Jan,2010 Rev 1.0
Free Datasheet http://www.Datasheet4U.com
11 Page | ||
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