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PDF EUA6027 Data sheet ( Hoja de datos )
| Número de pieza | EUA6027 | |
| Descripción | Stereo Audio Power Amplifier | |
| Fabricantes | Eutech Microelectronics | |
| Logotipo |  |
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EUA6027
2-W Stereo Audio Power Amplifier
with Selectable Gain and Shutdown
DESCRIPTOIN
The EUA6027 is a stereo audio speaker amplifier in a 20-pin
TSSOP thermally enhanced package. Operating on a single 5V
supply, EUA6027 is capable of delivering 2W of output power
per channel into 3 loads with less than 1% THD+N.
Amplifier gain is internally configured and controlled by way of
two terminals (GAIN0 and GAIN1). Gain settings of 6 dB, 10 dB,
15.6 dB, and 21.6 dB (inverting) are provided. Internal gain
control requires few external components.
Other features include an active-low shutdown mode input and
thermal shutdown protection.
FEATURES
z 2W/Ch Output Power Into 3-Ω Load From 5-V
Supply
z Internal Gain Control
z Fully Differential Input
z Depop Circuitry
z Thermal Shutdown Protection
z TSSOP-20 with Thermal Pad
z RoHS Compliant and 100% Lead (Pb)-Free
Typical Application
APPLICATIONS
z Notebook Computers, PDAs, and Other Portable
Audio Devices
DS6027 Ver 1.0 Feb. 2007
www.DataSheet.in
Figure 1.
1
1 page  
Absolute Maximum Ratings
EUA6027
Supply voltage, VDD------------------------------------------------------------------------------------------------ 6V
Input voltage, VI------------------------------------------------------------------------------ –0.3 V to VDD +0.3 V
Operating free-air temperature range, TA--------------------------------------------------------- –40 C to 85 C
Operating junction temperature range, TJ ------------------------------------------------------ - –40 C to 150 C
Storage temperature range, Tstg------------------------------------------------------------------ -- –65 C to 150 C
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds----------------------------------------- 260 C
Thermal Resistance
θJA (TSSOP) ----------------------------------------------------------------------------------------------- 87.9°C/W
Recommended Operating Conditions
Min Max Unit
Supply voltage, VDD
High-level input voltage, VIH
Low-level input voltage, VIL
Operating free-air temperature, TA
SHUTDOWN
SHUTDOWN
4.5 5.5 V
2V
0.8 V
-40 85 °C
Electrical Characteristics at Specified Free-air Temperature, VDD = 5V, TA = 25°C
(unless otherwise noted)
Symbol
Parameter
VOO
PSRR
IIH
IIL
IDD
IDD(SD)
Output offset voltage
(measured differentially)
Power supply rejection ratio
High-level input current
Low-level input current
Supply current, no load
Supply current, shutdown mode
Conditions
VI= 0, AV=-2V/V,BTL,no load
VDD= 4.5 V to 5.5 V
VDD= 5.5V, VI = VDD
VDD=5.5V, VI = 0V
SHUTDOWN =2V
SHUTDOWN =0.8V
EUA6027
Min. Typ. Max.
5 25
Unit
mV
77 dB
1 µA
1 µA
10.7 mA
80 300 µA
Operating Characteristics, VDD = 5V, TA = 25°C, RL = 8Ω, Gain =-2V/V(unless otherwise noted)
Symbol
Parameter
Conditions
EUA6027
Unit
Min. Typ. Max.
PO
THD+N
BOM
KSVR
Output power
Total harmonic distortion plus
noise
Maximum output power
bandwidth
Supply ripple rejection ratio
THD=1%, RL=4Ω,f=1kHz
PO=1W, RL=8Ω, f=20Hz to 15kHz
THD=5%, RL=8Ω
f =1kHz, CB=0.47µF
1.9
0.05
@1KHz
15
-75
W
%
kHz
dB
SNR Signal-to-noise ratio
100 dB
Vn
Noise output voltage
CB=0.47µF,f=20 Hz to 20 kHz,
20.3 µVRMS
DS6027 Ver 1.0 Feb. 2007
5
www.DataSheet.in
5 Page 
EUA6027
Application Information
Shutdown Modes
The EUA6027 employs a shutdown mode of operation
designed to reduce supply current, IDD, to the absolute
minimum level during periods of nonuse for battery-power
conservation. The SHUTDOWN input terminal should be
held high during normal operation when the amplifier is in
use. Pulling SHUTDOWN low causes the outputs to mute
and the amplifier to enter a low-current state, IDD=150µA
(max). SHUTDOWN should never be left unconnected
because amplifier operation would be unpredictable.
The value of
Ci is important to
consider as it directly affects the bass (low frequency)
performance of the circuit. Consider the example where Zi
is 70kΩ and the specification calls for a flat bass response
down to 40Hz. Equation 2 is reconfigured as equation 2.
Gain Setting via GAIN0 and GAIN1 Inputs
The gain of the EUA6027 is set by two input terminals,
GAIN0 and GAIN1.
Table 1 .Gain Settings
GAIN0
GAIN1
AV(inv)
Input
Impedance
0 0 6dB 90k
0
1
10dB
70k
1
0
15.6dB
45k
1
1
21.6dB
25k
The gains listed in Table 1 are realized by changing the taps
on the input resistors inside the amplifier. This causes the
input impedance, ZI, to be dependent on the gain setting.
The actual gain settings are controlled by ratios of resistors,
so the actual gain distribution from part-to-part is quite
good. However, the input impedance will shift by 30% due
to shifts in the actual resistance of the input impedance.
For design purposes, the input network (discussed in the
next section) should be designed assuming an input
impedance of 10 k , which is the absolute minimum input
impedance of the EUA6027. At the higher gain settings, the
input impedance could increase to as high as 115 k . The
typical input impedance at each gain setting is given in
Table 1.
Input Capacitor, Ci
In the typical application an input capacitor, Ci, is required
to allow the amplifier to bias the input signal to the proper
dc level for optimum operation. In this case, Ci and the input
impedance of the amplifier, Zi, form a high-pass filter with
the corner frequency determined in equation 1.
fc(highpass)=
1 -----------------(1)
2π ZiCi
Ci =
1
2π ZifC
----------------------------(2 )
In this example, Ci is 56nF so one would likely choose a
value in the range of 56nF to 1µF. A further consideration
for this capacitor is the leakage path from the input source
through the input network (Ci) and the feedback network 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 low-
leakage tantalum or 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. Note that it is
important to confirm the capacitor polarity in the
application.
Power Supply Decoupling, (CS)
The EUA6027 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. The optimum decoupling is achieved by using
two capacitors of different types that target different types
of noise on the power supply leads. For higher frequency
transients, spikes, or digital hash on the line, a good low
equivalent-series-resistance (ESR) ceramic capacitor,
typically 0.1µF placed as close as possible to the device
VDD lead, works best. For filtering lower-frequency noise
signals, a larger aluminum electrolytic capacitor of 10µF or
greater placed near the audio power amplifier is
recommended.
DS6027 Ver 1.0 Feb. 2007
www.DataSheet.in
11
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