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PDF EUA2012A Data sheet ( Hoja de datos )
| Número de pieza | EUA2012A | |
| Descripción | 2.5-W/CH Stereo Filter-less Class-D Audio Power Amplifier | |
| Fabricantes | Eutech Microelectronics | |
| Logotipo |  |
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EUA2012A
2.5-W/CH Stereo Filter-less Class-D
Audio Power Amplifier with Auto-Recovery
DESCRIPTION
The EUA2012A is a high efficiency, 2.5W/channel stereo
class-D audio power amplifier. A low noise, filterless
PWM architecture eliminates the output filter, requiring
only two external components for operation.
Operating from a single 5V supply, EUA2012A is capable
of delivering 2.5W/ channel of continuous output power to
a 4Ω load with 10% THD+N.
The EUA2012A features independent shutdown controls
for each channel. The gain can be selected to 6, 12, 18, or
24 dB utilizing the G0 and G1 gain select pins. High PSRR
and differential architecture provide increased immunity to
noise and RF rectification.
The EUA2012A is available in space-saving WCSP,
TQFN and TSSOP packages, is an idea choice for mobile
phones and other portable communication devices.
FEATURES
Low EMI Emission
Output Power By TQFN Package
- 2.5W/Ch Into 4Ω at 5V
- 1.6W/Ch Into 8Ω at 5V
- 800mW/Ch Into 8Ω at 3.6V
Wide Supply Voltage: 2.5V to 5.5V
Independent Shutdown Control for Each Channel
Selectable Gain of 6,12,18 and 24 dB
High PSRR :63dB at 217Hz
Fast 34ms Startup Time
Low 5mA Quiescent Current at 3.6V Supply and
1.5µA Shutdown Current
Short-Circuit Auto-Recovery and Thermal Protection
Space Saving Packages
- 4mm × 4mm TQFN-20 package
- 2mm × 2mm WCSP-16 package
- TSSOP-20 package
RoHS Compliant and 100% Lead(Pb)-Free,
Halogen-Free
Typical Application Circuit
APPLICATIONS
Wireless or Cellular Handsets and PDAs
Portable Audios
Notebook PC
DS2012A Ver 1.4 Feb. 2011
Figure1.
1
1 page  
EUA2012ATel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com
Electrical Characteristics TA = +25°C, RL=8Ω (Unless otherwise noted)
Symbol
Parameter
Conditions
EUA2012A
Min Typ Max. Unit
G0,G1=0.35V
5.3 6 6.5
G0=VDD ,G1=0.35V
Closed-loop voltage gain
G0=0.35V,G1= VDD
11.2 12 12.5
dB
17.2 18 18.5
G0,G1= VDD
23 24 24.5
Output power
RL=8Ω VDD= 5V,f=1kHz,THD=10%
1.6
PO (per channel)
VDD= 3.6V,f=1kHz,THD=10% 0.8 W
RL=4Ω VDD= 5V, ,f=1kHz,THD=10%
2.5
THD+N
Total harmonic
distortion plus noise
PO=1W,VDD= 5V,AV=6dB,f=1kHz
PO=0.5W,VDD= 5V,AV=6dB,f=1kHz
0.13
%
0.11
Channel crosstalk
f=1kHz
-82 dB
kSVR
Supply ripple rejection
ratio
CMRR
Common mode
rejection ratio
Input impedance
Start-up time from
shutdown
Output voltage noise
VDD= 5V,AV=6dB,f=217 Hz
VDD= 3.6V,AV=6dB,f=217 Hz
VDD= 3.6V,VIC=1VPP,f=217 Hz
AV=6dB
AV=12dB
AV=18dB
AV=24dB
VDD= 3.6V
VDD= 3.6V,f=20 to
20kHz,Inputs are ac
grounded, AV=6dB
No weighting
A weighting
-62
dB
-63
-60 dB
30.8
18.6
kΩ
12.4
6.3
34 ms
56
µV
39
DS2012A Ver 1.4 Feb. 2011
5
5 Page 
EUA2012ATel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com
Application Information
Decoupling Capacitor (CS)
The EUA2012A 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
PVDD lead works best. Placing this decoupling capacitor
close to the EUA2012A is 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 4.7µF 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.
G1 G0
00
01
10
11
Table 1. Gain Setting
GAIN
(V/V)
GAIN
(dB)
Input Impedance
(RI)(KΩ)
26
4 12
8 18
16 24
30.8
18.6
12.4
6.3
Input Capacitors (CI)
The EUA2012A 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. If the input signal is not
biased within the recommended common −mode input
range, if 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
(1).
( )1
fc = 2πR ICI
--------------------------------------------(1)
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.
Not using input capacitors can increase output offset.
Equation (2) is used to solve for the input coupling
capacitance.
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.
Component Location
Place all the external components very close to the
EUA2012A. Placing the decoupling capacitor, CS, close
to the EUA2012A is important for the efficiency of the
Class-D amplifier. Any resistance or inductance in the
trace between the device and the capacitor can cause a
loss in efficiency.
Filter Free Operation and Ferrite Bead Filters
A ferrite bead filter can often be used if the design is failing
radiated emissions without an LC filter and the frequency
sensitive circuit is greater than 1 MHz. This filter functions
well for circuits that just have to pass FCC and CE because
FCC and CE only test radiated emissions greater than 30
MHz. When choosing a ferrite bead, choose one with high
impedance at high frequencies, and very low impedance at
low frequencies. In addition, select a ferrite bead with
adequate current rating to prevent distortion of the output
signal.
Use an LC output filter if there are low frequency (< 1
MHz) EMI sensitive circuits and/or there are long leads
from amplifier to speaker.
Figure 34 shows typical ferrite bead and LC output filters.
Figure34. Typical Ferrite Chip Bead Filter
Short Circuit Auto-Recovery
When a short circuit event happens, the EUA2012A goes
to shutdown mode and tries to reactivate itself after 4ms.
This auto-recovery will continue until the short circuit
events is removed.
( )CI =
1
2πR Ifc
--------------------------------------------(2)
DS2012A Ver 1.4 Feb. 2011
11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet EUA2012A.PDF ] | |
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