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PDF EUA4996 Data sheet ( Hoja de datos )

Número de pieza EUA4996
Descripción 2.8-W Stereo Fully Differential Audio Power Amplifier
Fabricantes Eutech Microelectronics 
Logotipo Eutech Microelectronics Logotipo



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EUA4996
2.8-W Stereo Fully Differential
Audio Power Amplifier
DESCRIPTION
The EUA4996 is a stereo fully-differential audio
amplifier, capable of delivering 2.8W/channel of
continuous output power to a 3load with 10% THD+N
from a 5V power supply.
The EUA4996 features independent shutdown control
for each channel. The feedback resistors are internal,
allowing the gain to be set with only two input resistors
per channel. High PSRR and fully differential
architecture provide increased immunity to noise and RF
rectification, and a fast startup time with minimal pop,
making the EUA4996 idea for notebook PC, smart
phone applications.
FEATURES
z Output Power
- 2.8W/Ch Into 3at 5V, THD=10% (Typ.)
- 1.99W/Ch Into 4at 5V, THD=1% (Typ.)
- 1.27W/Ch Into 8at 5V, THD=1% (Typ.)
z Wide Supply Voltage: 2.5V to 5.5V
z Independent Shutdown Control for Each Channel
z High PSRR : 86dB
z Fast 23ms Startup Time with Minimal POP
z Low 8mA Quiescent Current at 5V Supply and 1µA
Shutdown Current
z Thermal Protection
z 4mm × 4mm TQFN-16 Package
z RoHS Compliant and 100% Lead(Pb)-Free
APPLICATIONS
z Notebook PCs
z Smart Phones
Typical Application Circuit
DS4996 Ver0.1 July 2008
Figure 1.
1

1 page




EUA4996 pdf
Tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com
EUA4996
Operating Characteristics, TA=25°C, Gain=1V/V
Symbol
Parameter
Conditions
EUA4996
Unit
Min Typ Max.
PO Output power
VDD=5V
THD+N=1%, f=1kHz,RL=3VDD=3.6V
2.25
1.13
VDD=2.5V
0.46
VDD=5V
1.99
THD+N=1%, f=1kHz,RL=4VDD=3.6V 1 W
VDD=2.5V
0.42
VDD=5V
THD+N=1%, f=1kHz,RL=8VDD=3.6V
1.27
0.65
VDD=2.5V
0.29
PO=2W
f=1kHz ,RL=3PO=1W
VDD=5V
VDD=3.6V
0.16
0.19
PO=300mW VDD=2.5V
0.08
PO=1.8W
VDD=5V
0.09
THD+N
Total harmonic distortion
plus noise
f=1kHz ,RL=4PO=0.7W
VDD=3.6V
0.06
%
PO=300mW VDD=2.5V
0.07
PO=1W
f=1kHz ,RL=8PO=0.5W
VDD=5V
VDD=3.6V
0.04
0.04
KSVR
Supply ripple rejection
ratio
Crosstalk
PO=200mW VDD=2.5V
VDD=3.6V,
Inputs ac-grounded
f = 217Hz
with Ci=2µF,
V(Ripple)=200mVpp
f = 1kHz
VDD=5V, RL=3, f=1kHz ,PO=1W
0.05
-86
dB
-80
-99 dB
SNR Signal-to-noise ratio
VDD=5V, PO=2W,RL=3,f=1kHz,Gain=1V/V
106
dB
Vn Output voltage noise
VDD=3.6V, f=20Hz to 20kHz,
Gain=1V/V ,Inputs ac-grounded
with CI=0.22µF
No
weighting
A
weighting
12
µVRMS
8.7
CMRR
Common mode rejection
ratio
VDD=3.6V,VIC=200mVPP
f=217Hz
-60 dB
ZI Input impedance
38 40 42 k
Start-up time from
shutdown
VDD=3.6V, CBYPASS=0.1µF
23 ms
Note: The thermal performance of the TQFN package when used with the exposed- DAP connected to a thermal plane
is sufficient for driving 4or 3loads.
DS4996 Ver0.1 July 2008
5

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EUA4996 arduino
Tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com
EUA4996
Proper Selection of External Components
Gain-Setting Resistor Selection
The input resistor (RI) can be selected to set the gain of
the amplifier according to equation2.
Gain=RF/RI
(2)
The internal feedback resistors (RF) are trimmed to
40k.
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 the cancellation of the second
harmonic distortion diminishes if resistor mismatch
occurs. Therefore, it is recommended to use 1%
tolerance resistors or better to keep the performance
optimized.
Bypass Capacitors (CBYPASS) and Start-up Time
The internal voltage divider at the Bypass pin of this
device sets a mid-supply voltage for internal references
and sets the output common mode voltage to VDD/2.
Adding a capacitor to this pin filters any noise into this
pin and increases kSVR. C(BYPASS) also determines the rise
time of VO+ and VO- when the device is taken out of
shutdown. The larger the capacitor, the slower the rise
time. IF Bypass Capacitors are used, it is necessary to
use separate bypass capacitors for each bypass pin.
Input Capacitor (CI)
The EUA4996 does not require input coupling
capacitors if using a differential input source that is
biased from 0.5V to VDD -0.8V. Use 1% tolerance or
better gain-setting resistors if not using input coupling
capacitors.
In the single-ended input application an input capacitor,
CI, is required to allow the amplifier to bias the input
signal to the proper dc level. In this case, CI and RI form
a high-pass filter with the corner frequency determined
in equation3.
1
f=
C 2π R C
II
(3)
The value of CI is important to consider as it directly
affects the bass (low frequency) performance of the
circuit.
Consider the example where RI is 10kand the
specification calls for a flat bass response down to 100Hz.
Equation 3 is reconfigured as equation4.
1
C=
I 2π R f
IC
(4)
In this example, CI is 0.16µF, so one would likely choose
a value in the range of 0.22µF to 0.47µF.
Ceramic capacitors should be used when possible, as they
are the best choice in preventing leakage current. When
polarized capacitors are used, the positive side of the
capacitor should face the amplifier input in most
applications, as the dc level there is held at VDD/2, which
is likely higher than the source dc level. It is important to
confirm the capacitor polarity in the application.
Decoupling Capacitor (CS)
The EUA4996 is a high-performance CMOS audio
amplifier that requires adequate power supply decoupling
to ensure the output total harmonic distortion (THD) is as
low as possible. Power supply decoupling also prevents
oscillations for long lead lengths between the amplifier
and the speaker. For higher frequency transients, spikes,
or digital hash on the line, a good low
equivalent-series-resistance (ESR) ceramic capacitor,
typically 0.1µF to 1 µF, placed as close as possible to the
device VDD lead works best. For filtering lower frequency
noise signals, a 10-µF or greater capacitor placed near the
audio power amplifier also helps, but is not required in
most applications because of the high PSRR of this
device.
Each VDD pin must have a separate power supply
decoupling capacitor. Additionally, the left and high
channel VDD pins must be tied together on the PCB.
DS4996 Ver0.1 July 2008
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