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PDF EUA2011A Data sheet ( Hoja de datos )
| Número de pieza | EUA2011A | |
| Descripción | 2.5-W Mono Filterless Class-D Audio Power Amplifier | |
| Fabricantes | Eutech Microelectronics | |
| Logotipo |  |
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EUA2011A
Low EMI, Ultra-Low Distortion, 2.5-W Mono
Filterless Class-D Audio Power Amplifier
DESCRIPTION
The EUA2011A is a high efficiency, 2.5W mono class-D
audio power amplifier. A new developed filterless PWM
modulation architecture further reduces EMI and THD+N,
as well as eliminates the LC output filter, reducing external
component count, system cost, and simplifying design.
Operating in a single 5V supply, EUA2011A is capable of
driving 4Ω speaker load at a continuous average output of
2.5W/10% THD+N or 2W/1% THD+N. The EUA2011A
has high efficiency with speaker load compared to a typical
class AB amplifier. With a 3.6V supply driving an 8Ω
speaker , the efficiency for a 400mW power level is 84%.
In cellular handsets, the earpiece, speaker phone, and
melody ringer can each be driven by the EUA2011A. The
gain of EUA2011A is externally configurable which allows
independent gain control from multiple sources by
summing signals from separate sources.
The EUA2011A is available in space-saving WCSP
package.
FEATURES
z Unique Modulation Scheme Reduces EMI Emissions
z Efficiency at 3.6V With an 8-Ω Speaker:
− 84% at 400 mW
z Low 2.4-mA Quiescent Current and
0.5-µA Shutdown Current
z 2.5V to 5.5V Wide Supply Voltage
z Ultra-Low Distortion - 0.07% THD+N at 1W and
8-Ω Load
z Shutdown Pin Compatible with 1.8V Logic GPIO
z Improved PSRR (−72 dB) Eliminates Need for a
Voltage Regulator
z Fully Differential Design Reduces RF Rectification
and Eliminates Bypass Capacitor
z Improved CMRR Eliminates Two Input
Coupling Capacitors
z Internally Generated 250-kHz Switching
Frequency
z Integrated Pop and Click Suppression Circuitry
z 1.5mm × 1.5mm Wafer Chip Scale Package (WCSP)
z RoHS compliant and 100% lead(Pb)-free
Typical Application Circuit
APPLICATIONS
z Ideal for Wireless or cellular Handsets and PDAs
DS2011A Ver 0.2 July 2008
Figure1
1
1 page  
EUA2011A
Electrical Characteristics TA = 25°C ,Gain= 2V/V,RL=8Ω (Unless otherwise noted)
Symbol
Parameter
Conditions
EUA2011A
Min Typ Max.
VDD= 5V
THD+N=10%,
f=1kHz, RL=4Ω
VDD= 3.6V
VDD= 2.5V
2.50
1.25
0.58
PO Output power
VDD= 5V
THD+N=1%,
f=1kHz, RL=4Ω
VDD= 3.6V
VDD= 2.5V
VDD= 5V
THD+N=10%,
f=1kHz, RL=8Ω
VDD= 3.6V
VDD= 2.5V
2
1
0.45
1.58
0.80
0.36
VDD= 5V
THD+N=1%,
f=1kHz, RL=8Ω
VDD= 3.6V
VDD= 2.5V
1.26
0.63
0.29
THD+N
Total harmonic distortion
plus noise
VDD= 5V,PO=1W, RL=8Ω, f=1kHz
VDD= 3.6V,PO=0.5W, RL=8Ω, f=1kHz
VDD= 2.5V,PO=200mW, RL=8Ω, f=1kHz
0.07
0.05
0.05
Unit
W
W
W
W
%
kSVR Supply ripple rejection ratio
VDD= 3.6V, Inputs f=217 Hz,
ac-grounded with V(RIPPLE)=200mVpp
CI= 2µF
-60
dB
SNR Signal-to-noise ratio
Vn Output voltage noise
CMRR
ZI
Common mode rejection
ratio
Start-up time from shutdown
VDD= 5V,PO=1W, RL=8Ω
VDD= 3.6V,
f=20Hz to
No weighting
20kHz,Inputs
ac-grounded with A weighting
CI= 2µF
VDD= 3.6V,
VIC=1 VPP
f=217 Hz
VDD= 3.6V
85 dB
220
µVRMS
96
-55 dB
11.5 ms
DS2011A Ver 0.2 July 2008
5
5 Page 
EUA2011A
Application Information
Fully Differential Amplifier
The EUA2011A is a fully differential amplifier that
features differential inputs and outputs. The EUA2011A
also includes a common mode feedback loop that controls
the output bias value to average it at VCC/2 for any DC
common mode input voltage. This allows the device to
always have a maximum output voltage swing, and by
consequence, maximize the output power. Moreover, as
the load is connected differentially, compared to a
single-ended topology, the output is four times higher for
the same power supply voltage. The fully differential
EUA2011A can still be used with a single-ended input;
however, the EUA2011A should be used with differential
inputs when in a noisy environment, like a wireless
handset, to ensure maximum noise rejection.
Advantages of Fully Differential Amplifiers
The advantages of a full-differential amplifier are:
z Very high PSRR (Power Supply Rejection Ratio).
z High common mode noise rejection.
z Virtually zero pop without additional circuitry,
giving an faster start-up time compared to
conventional single-ended input amplifiers.
z No input coupling capacitors required thanks to
common mode feedback loop.
z Midsupply bypass capacitor not required.
Figure 30. Differential Input Configuration
Figure 32. Single-Ended Input Configuration
Gain Selection
The input resistors (RI) set the gain of the amplifier
according to equation (1).
Gain = 2 × 150kΩ
RI
V
V
---------------------------------(1)
Resistor matching is very important for CMRR, PSRR,
and harmonic distortion. It is recommended to use 1%
tolerance resistors or better to keep the performance
optimized. Matching is more important than overall
tolerance. Resistor arrays with 1% matching can be used
with a tolerance greater than 1%.
Keeping the input trace as short as possible to limit noise
injection on the high-impedance nodes.
For optimal performance the gain should be set to 2 V/V
or lower. Lower gain allows the EUA2011A to operate at
its best, and keeps a high voltage at the input making the
inputs less susceptible to noise.
Power Supply Decoupling Capacitor (CS)
The EUA2011A is a high-performance CMOS class-D
audio amplifier that requires adequate power supply
decoupling to ensure the efficiency is high and total
harmonic distortion (THD) is low. For higher frequency
transients, spikes, or digital hash on the line, a good low
equivalent-series-resistance (ESR) ceramic capacitor,
typically 1µF, placed as close as possible to the device
VDD lead works best. Placing this decoupling capacitor
close to the EUA2011A is very important for the
efficiency of the class-D amplifier, because any resistance
or inductance in the trace between the device and the
capacitor can cause a loss in efficiency. For filtering
lower-frequency noise signals, a 10µF or greater capacitor
placed near the audio power amplifier would also help.
Figure 31. Differential Input Configuration and Input
Capacitors
DS2011A Ver 0.2 July 2008
11
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| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet EUA2011A.PDF ] | |
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