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PDF EUA2011 Data sheet ( Hoja de datos )
| Número de pieza | EUA2011 | |
| Descripción | 3-W Mono Filterless Class-D Audio Power Amplifier | |
| Fabricantes | Eutech Microelectronics | |
| Logotipo |  |
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EUA2011
3-W Mono Filterless Class-D
Audio Power Amplifier
DESCRIPTION
The EUA2011 is a high efficiency, 3W mono class-D audio
power amplifier. A low noise, filterless PWM architecture
eliminates the output filter, reducing external component
count, system cost, and simplifying design.
Operating in a single 5V supply, EUA2011 is capable of
driving 4Ω speaker load at a continuous average output of
3W/10% THD+N or 2W/1% THD+N. The EUA2011 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 88%.
In cellular handsets, the earpiece, speaker phone, and
melody ringer can each be driven by the EUA2011. The
gain of EUA2011 is externally configurable which allows
independent gain control from multiple sources by
summing signals from separate sources.
The EUA2011 is available in space-saving WCSP and
TDFN packages.
FEATURES
z Unique Modulation Scheme Reduces EMI Emissions
z Efficiency at 3.6V With an 8-Ω Speaker:
− 88% at 400 mW
− 80% at 100 mW
z Low 2.4-mA Quiescent Current and
0.5-µA Shutdown Current
z 2.5V to 5.5V Wide Supply Voltage
z Shutdown Pin Compatible with 1.8V Logic GPIO
z Optimized PWM Output Stage Eliminates
LC Output Filter
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)
and 3mm × 3mm TDFN-8 package
z RoHS compliant and 100% lead(Pb)-free
Typical Application Circuit
APPLICATIONS
z Ideal for Wireless or cellular Handsets and PDAs
www.DataSheet4U.com
DS2011 Ver 1.1 Dec. 2007
Figure1.
1
1 page  
EUA2011
Electrical Characteristics TA = 25°C ,Gain= 2V/V,RL=8Ω (Unless otherwise noted)
Symbol
Parameter
Conditions
EUA2011
Min Typ Max.
VDD= 5V
THD+N=10%,
f=1kHz, RL=4Ω
VDD= 3.6V
VDD= 2.5V
3
1.4
0.65
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
2.15
1.06
0.49
1.67
0.84
0.39
VDD= 5V
THD+N=1%,
f=1kHz, RL=8Ω
VDD= 3.6V
VDD= 2.5V
1.36
0.66
0.30
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
0.18
0.18
0.17
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
www.DataSheet4U.com
CMRR
Common mode rejection
ratio
ZI 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
93 dB
62
µVRMS
45
-55 dB
11.5 ms
DS2011 Ver 1.1 Dec. 2007
5
5 Page 
Application Information
Fully Differential Amplifier
The EUA2011 is a fully differential amplifier with
differential inputs and outputs. The fully differential
amplifier consists of a differential amplifier and a
common-mode amplifier. The differential amplifier
ensures that the amplifier outputs a differential voltage on
the output that is equal to the differential input times the
gain. The common-mode feedback ensures that the
common-mode voltage at the output is biased around
VDD/2 regardless of the common-mode voltage at the
input. The fully differential EUA2011 can still be used
with a single-ended input; however, the EUA2011
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
z Input-coupling capacitors not required:
- The fully differential amplifier allows the inputs to
be biased at voltage other than mid-supply. For
example, if a codec has a midsupply lower than the
midsupply of the EUA2011, the common-mode
feedback circuit will adjust, and the EUA2011 outputs
will still be biased at midsupply of the EUA2011. The
inputs of the EUA2011 can be biased from 0.5V to
VDD – 0.8 V. If the inputs are biased outside of that
range, input-coupling capacitors are required.
z Midsupply bypass capacitor, C(BYPASS), not required:
- The fully differential amplifier does not require a
bypass capacitor. This is because any shift in the
midsupply affects both positive and negative channels
equally and cancels at the differential output.
www.DzataShBeeet4ttUe.rcoRmF−immunity:
-GSM handsets save power by turning on and shutting
off the RF transmitter at a rate of 217 Hz. The
transmitted signal is picked-up on input and output
traces. The fully differential amplifier cancels the
signal much better than the typical audio amplifier.
Component Selection
Figure 30 shows the EUA2011 typical schematic with
differential inputs and Figure 31 shows the EUA2011
with differential inputs and input capacitors, and Figure
32 shows the EUA2011 with single-ended inputs.
Differential inputs should be used whenever possible
because the single-ended inputs are much more
susceptible to noise.
EUA2011
Table 1. Typical Component Values
REF DES
VALUE
RI 150kΩ ( ± 0.5%)
CS 1µF (+22%,-80%)
CI (1)
3.3nF ( ± 10%)
(1) CI is only needed for single-ended input or if VICM is
not between 0.5 V and VDD – 0.8 V. CI = 3.3 nF (with RI =
150 kΩ) gives a high-pass corner frequency of 321 Hz.
Figure 30. Typical Application Schematic with
Differential Input for a Wireless Phone
Figure 31. Typical Application Schematic with
Differential Input and Input Capacitors
DS2011 Ver 1.1 Dec. 2007
Figure 32. Typical Application Schematic with
Single-Ended Input
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet EUA2011.PDF ] | |
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