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EUA2011 Schematic ( PDF Datasheet ) - Eutech Microelectronics

Teilenummer EUA2011
Beschreibung 3-W Mono Filterless Class-D Audio Power Amplifier
Hersteller Eutech Microelectronics
Logo Eutech Microelectronics Logo 




Gesamt 16 Seiten
EUA2011 Datasheet, Funktion
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 4speaker 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 8
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-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






EUA2011 Datasheet, Funktion
Typical Operating Characteristics
EUA2011
100
90
80
70
60
50
40
30
20
10
0
0.0
EFFICIENCY vs OUTPUT POWER
V =2.5V,
DD
RL= 8 ohm + 33uH
V =5V,
DD
RL=8 ohm+33uH
V =3.6V,
DD
RL=8 ohm + 33uH
0.2 0.4 0.6 0.8 1.0 1.2
P - Output Power - W
O
Figure2.
POWER DISSIPATION vs OUTPUT POWER
1.4
1.2
1.0
0.8
0.6
0.4
V =5V, RL=4 ohm
DD
0.2
0.0
0.0 0.5
www.DataSheet4U.com
V =5V, RL=8 ohm
DD
1.0 1.5 2.0
P - Output Power - W
O
Figure4.
2.5
EFFICIENCY vs OUTPUT POWER
90
80
70
60
V =2.5V,
DD
50 RL= 4 ohm + 33uH
V =5V,
DD
RL=4 ohm+33uH
V =3.6V,
40
DD
RL=4 ohm + 33uH
30
20
10
0
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
P - Output Power - W
O
Figure3.
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
0.0
POWER DISSIPATION vs OUTPUT POWER
V =3.6V, RL=4 ohm
DD
V =3.6V, RL=8 ohm
DD
0.2 0.4 0.6 0.8 1.0 1.2
P - Output Power - W
O
Figure5.
SUPPLY CURRENT vs OUTPUT POWER
700
RL= 4 ohm, 33uH
600
VDD=5V
500
400
300
VDD=2.5V
200
VDD=3.6V
100
0
0.0 0.5 1.0 1.5 2.0
P - Output Power - W
O
Figure6.
2.5
SUPPLY CURRENT vs OUTPUT POWER
250
RL= 8 ohm, 33uH
VDD=5V
200
VDD=3.6V
150 VDD=2.5V
100
50
0
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4
P - Output Power - W
O
Figure7.
DS2011 Ver 1.1 Dec. 2007
6

6 Page









EUA2011 pdf, datenblatt
Input Resistors (RI)
The input resistors (RI) set the gain of the amplifier
according to equation (1).
Gain = 2 × 150k
RI

V
V

---------------------------------(1)
Resistor matching is very important in fully differential
amplifiers. The balance of the output on the reference
voltage depends on matched ratios of the resistors. CMRR,
PSRR, and cancellation of the second harmonic distortion
diminish if resistor mismatch occurs. Therefore, 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%.
Place the input resistors very close to the EUA2011 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 EUA2011 to operate at its
best, and keeps a high voltage at the input making the
inputs less susceptible to noise.
Decoupling Capacitor (CS)
The EUA2011 is a high-performance 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 EUA2011 is very important for the efficiency
wwwo.DfatathSeheect4laUs.sc-oDm 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,
but it is not required in most applications because of the
high PSRR of this device.
Input Capacitors (CI)
The EUA2011 does not require input coupling capacitors
if the design uses a differential source that is biased from
0.5 V to VDD – 0.8 V (shown in Figure 31). If the input
signal is not biased within the recommended common
mode input range, if needing to use the input as a high
pass filter (shown in Figure 32), or if using a single-ended
source (shown in Figure 33), input coupling capacitors are
required.
The input capacitors and input resistors form a high-pass
filter with the corner frequency, fc, determined in equation
(2).
EUA2011
( )fc =
1
2πR ICI
--------------------------------------------(2)
The value of the input capacitor is important to consider
as it directly affects the bass (low frequency) performance
of the circuit. Speakers in wireless phones cannot usually
respond well to low frequencies, so the corner frequency
can be set to block low frequencies in this application.
Equation (3) is reconfigured to solve for the input
coupling capacitance.
( )CI =
1
2πR Ifc
--------------------------------------------(3)
If the corner frequency is within the audio band, the
capacitors should have a tolerance of ± 10% or better,
because any mismatch in capacitance causes an
impedance mismatch at the corner frequency and below.
For a flat low-frequency response, use large input
coupling capacitors (1 µF). However, in a GSM phone the
ground signal is fluctuating at 217 Hz, but the signal from
the codec does not have the same 217 Hz fluctuation. The
difference between the two signals is amplified, sent to
the speaker, and heard as a 217 Hz hum.
Single-Ended Input Depop Function
In single-ended input application, there is an inherently
voltage difference in input pairs when shutdown is
released. In order to eliminate pop noise, the pop
cancellation circuit need to charge the input capacitor CI
until fully-differential inputs are balanced and output
power to load gradually.
The RC time constant should within the de-pop delay, if
150kRI is chosen, the recommended CI should small
than 10nF for a good pop immunity.
Summing Input Signals
Most wireless phones or PDAs need to sum signals at the
audio power amplifier or just have two signal sources that
need separate gain. The EUA2011 makes it easy to sum
signals or use separate signal sources with different gains.
Many phones now use the same speaker for the earpiece
and ringer, where the wireless phone would require a
much lower gain for the phone earpiece than for the ringer.
PDAs and phones that have stereo headphones require
summing of the right and left channels to output the stereo
signal to the mono speaker.
DS2011 Ver 1.1 Dec. 2007
12

12 Page





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