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PDF EUA6205 Data sheet ( Hoja de datos )
| Número de pieza | EUA6205 | |
| Descripción | Audio Power Amplifier | |
| Fabricantes | Eutech Microelectronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de EUA6205 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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EUA6205
1.25-W Mono Fully Differential Audio Power
Amplifier with 1.8V Input Logic Thresholds
DESCRIPTION
The EUA6205 is a mono fully-differential audio
amplifier, capable of delivering 1.25W of continuous
average power to an 8Ω BTL load with less than 1%
THD+N from a 5V power supply, and 630mW to an 8Ω
load from a 3.6V power supply. The Shutdown pin is
fully compatible with 1.8V logic GPIO, such as
are used on low power cellular chipsets.
Features like 85-dB PSRR from 90 Hz to 5 kHz,
improved RF-rectification immunity, and small PCB
area makes the EUA6205 ideal for wireless handsets.
FEATURES
z Supply Voltage 2.5V to 5.5V
z 1.25W into 8Ω from a 5-V Supply at THD=1% (typ)
z Shutdown Pin has 1.8V Compatible Thresholds
z Low Supply Current: 3.4mA Typical
z Shutdown Current < 10µA
z Only Five External Components
- Improved PSRR (87dB) for Direct Battery
Operation
- Full Differential Design Reduces RF Rectification
- Improved CMRR Eliminates Two Input Coupling
Capacitors
z Available in 3mm*3mm TDFN-8 and Thermally
Enhanced MSOP-8 Packages
z RoHS Compliant and 100% Lead (Pb)-Free
APPLICATIONS
z Wireless Handsets, PDAs, and other mobile devices
Typical Application Circuit
DS6205 Ver 1.0 Mar. 2007
www.DataSheet.in
1
1 page  
Operating Characteristics, TA=25°C, Gain=1V/V, RL = 8Ω
Symbol Parameter
Conditions
PO Output power
Total harmonic
THD+N distortion plus
noise
KSVR
Supply ripple
rejection ratio
SNR
Signal-to-noise
ratio
THD + N = 1%, f = 1kHz
VDD = 5.5V
VDD = 3.6V
VDD = 2.5V
VDD = 5V, PO = 1W, f = 1kHz
VDD = 3.6V, PO = 0.5W, f = 1kHz
VDD = 2.5V, PO = 200mW, f = 1kHz
C(BYPASS) = 0.47µF, VDD = 5.5V
CI = 2µF
C(BYPASS) = 0.47µF, VDD = 3.6V
CI = 2µF
C(BYPASS) = 0.47µF, VDD = 2.5V
CI = 2µF
f = 217 Hz to 2 kHz
f = 217 Hz to 2 kHz
f = 217 Hz to 2 kHz
VDD = 5V, PO = 1W
EUA6205
EUA6205
Min Typ Max. Unit
1.25
0.63 W
0.3
0.067
0.065
%
0.077
-87.1
-86.5
dB
-64
108 dB
Vn
Output voltage
noise
f = 20 Hz to 20 kHz
No weighting
A weighting
10
µVRMS
8
CMRR
Common mode
rejection ratio
VDD = 5.5V,Gain = 4V/V,
VICM = 200mVpp
VDD = 3.6V,Gain = 4V/V,
VICM = 200mVpp
VDD = 2.5V,Gain = 4V/V,
VICM = 200mVpp
f = 20 Hz to 1 kHz
f = 20 Hz to 1 kHz
f = 20 Hz to 1 kHz
-71.6
-71.9
-60
dB
ZI Input impedance
2 MΩ
ZO
Output
impedance
Shutdown
attenuation
Shutdown mode
f = 20 Hz to 20 kHz,
RF = RI = 20 kΩ
>10k
-79
dB
DS6205 Ver 1.0 Mar. 2007
www.DataSheet.in
5
5 Page 
thermal resistance of the application can be reduced,
resulting in higher PDMAX. Additional copper foil can be
added to any of the leads connected to the EUA6205. If
TJMAX still exceeds 150°C, then additional changes must
be made. These changes can include reduced supply
voltage, higher load impedance, or reduced ambient
temperature. Internal power dissipation is a function of
output power.
Selection Components
Resistors (RF and RI)
The input (RI) and feedback resistors (RF) set the gain of
the amplifier according to Equation 2.
Gain = R F /R I ----------------------------------------(2)
RF and RI should range from 1kΩ to 100kΩ. Most graphs
were taken with RF=RI=20 kΩ.
Resistor matching is very important in fully differential
amplifiers. The balance of the output on the reference
voltage depends on matched rations of 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 Capacitor (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 the 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. Although the
output rise time depends on the bypass capacitor value, the
device passes audio 4 µs after taken out of shutdown and
the gain is slowly ramped up based
on C(BYPASS).
To minimize pops and clicks, design the circuit so the
impedance (resistance and capacitance) detected by both
inputs, IN+ and IN-, is equal.
Input Capacitor (CI)
The EUA6205 does not require input coupling capacitors if
using a differential input source that is biased from 0.5 V to
VDD - 0.8 V. 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 Equation 3.
f= 1
C 2π R C --------------------------------- (3)
II
EUA6205
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 10kΩ and the
specification calls for a flat bass response down to 100 Hz.
Equation 2 is reconfigured as Equation 4.
C
I
=
1
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. A further
consideration for this capacitor is the leakage path from
the input source through the input network (RI, CI) and the
feedback resistor (RF) to the load.
This leakage current creates a dc offset voltage at the
input to the amplifier that reduces useful headroom,
especially in high gain applications. For this reason, a
ceramic capacitor is the best choice. 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 EUA6205 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.
DS6205 Ver 1.0 Mar. 2007
11
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| PDF Descargar | [ Datasheet EUA6205.PDF ] | |
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