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EMA2203 Schematic ( PDF Datasheet ) - Elite Semiconductor

Teilenummer EMA2203
Beschreibung Stereo 2.4W Audio Power Amplifier
Hersteller Elite Semiconductor
Logo Elite Semiconductor Logo 




Gesamt 17 Seiten
EMA2203 Datasheet, Funktion
ESMT/EMP
EMA2203
Stereo 2.4W Audio Power Amplifier with DC
Volume Control and Headphone
GENERAL DESCRIPTION
The EMA2203 is a monolithic integrated circuit that
provides DC volume control, and stereo bridged audio
power amplifiers capable of producing 2W into 4Ω or
2.4W into 3Ω with less than 1.0% THD+N.
The EMA2203 incorporates a DC volume control, stereo
bridged audio power amplifiers making it optimally
suited for multimedia monitors, portable radios, desktop,
and portable computer applications. The EMA2203
features an low-power consumption shutdown mode,
and both power amplifier and headphone..
Advanced pop & click circuitry is built in to eliminate
noises that would otherwise occur during turn-on and
turn-off transitions.
KEY SPECIFICATION
BTL mode PO at 5V, f=1kHz, 1% THD+N
2.4W (typ) into 3Ω
2.0W (typ) into 4Ω
1.1W (typ) into 8Ω
BTL mode PO at 5V, f=1kHz, 10% THD+N
3W (typ) into 3Ω
Single-ended mode PO at 5V, f=1kHz, 1% THD+N
85mW (typ) into 32Ω
Shutdown current 0.1µA (typ)
FEATURES
32 steps DC Volume Control
Stereo switchable bridged/single-ended power
amplifiers
“Click and pop” suppression circuitry
Thermal shutdown protection circuitry
APPLICATIONS
Portable and Desktop Computers
Multimedia Monitors
Portable Radios, PDAs, and Portable TVs
Elite Semiconductor Memory Technology Inc./Elite MicroPower Inc.
Publication Date : Jun. 2009
Revision : 2.0
1/17






EMA2203 Datasheet, Funktion
ESMT/EMP
EMA2203
Absolute Maximum Ratings (Note 1)
Supply Voltage
Storage Temperature
Input Voltage
Power Dissipation
ESD Susceptibility
Junction Temperature
6.0V
-65°C to +150°C
-0.3V to VDD + 0.3V
Internally Limited
(Note 2) HBM 2kV
(Note 3) MM 200V
150°C
Thermal Resistance
θJA (TSSOP-20FD)
Operating Ratings
Temperature Range
Supply Voltage
80°C/W
-40°C TA 85°C
2.7V VDD 5.5V
ELECTRICAL CHARACTERISTICS FOR ENTIRE IC
The following specifications apply for VDD =5V unless otherwise specified. Limits apply for TA = 25°C.
Symbol
Parameter
Conditions
Conditions
Typical
Limit
Units
(Limits)
VDD Supply Voltage
2.7 V(min)
5.5 V(max)
Quiescent Power Supply
IDD Input AC to GND, No Load
Current
10
20 mA (max)
ISD Shutdown Current
VSDN = 5V
0.1 1.0 µA (max)
HPSENSE High Level
VIH
SDN High Level
4.0
V (min)
1.2
HPSENSE Low Level
VIL
SDN Low Level
0.8
V (max)
0.4
Electrical Characteristics for Volume Attenuators
The following specifications apply for VDD =5V, AV=2 unless otherwise specified. Limits apply for TA = 25°C.
Symbol
Parameter
Conditions
Conditions
Typical
Limit
Units
(Limits)
CRANGE
Attenuator Range
VDCVOL=5V
VDCVOL=0V
6 dB(max)
-88 -80 dB(min)
Electrical Characteristics for Single-Ended Mode Operation
The following specifications apply for VDD =5V unless otherwise specified. Limits apply for TA = 25°C.
Symbol
Parameter
Conditions
Conditions
Typical
Limit
THD+N=1%, f=1kHz, 32Ω
85
PO Output Power
THD+N=10%, f=1kHz, 32Ω
95
THD+N
Total Harmonic Distortion VOUT=1 VRMS, f=1kHz, 10kΩ
+ Noise
AV=1
0.05
Units
(Limits)
mW
mW
%
Elite Semiconductor Memory Technology Inc./Elite MicroPower Inc.
Publication Date : Jun. 2009
Revision : 2.0
6/17

6 Page









EMA2203 pdf, datenblatt
ESMT/EMP
EMA2203
Figure2. Single-ended Output Configuration
DOCKING STATION INTERFACE
Applications such as notebook computers can take advantage of a docking station to connect to external devices
such as monitors or audio/visual equipment that sends or receives line level signals. The EMA2203 has two outputs, Pin
6 and Pin 9, which connect to outputs of the internal input amplifiers that drive the volume control inputs. These input
amplifiers can drive loads of >1k(such as powered speakers) with a rail-to-rail signal. Since the output signal present
on the RDOCK and LDOCK pins is biased to VDD/2, coupling capacitors should be connected in series with the load.
Typical values for the coupling capacitors are 0.33μF to 1.0μF. If polarized coupling capacitors are used, connect their
"+" terminals to the respective output pin.
Since the DOCK outputs precede the internal volume control, the signal amplitude will be equal to the input signal’s
magnitude and cannot be adjusted. However, the input amplifier’s closed-loop gain can be adjusted using external
resistors. These resistors are shown in Figure 1 as 20kdevices that set each input amplifier’s gain to -1. Use Equation 2
to determine the input and feedback resistor values for a desired gain.
- AV
=
RF
RI
(2)
Adjusting the input amplifier’s gain sets the minimum gain for that channel. The DOCK outputs adds circuit and
functional flexibility because their use supercedes using the inverting outputs of each bridged output amplifier as
line-level outputs.
MICRO-POWER SHUTDOWN
The voltage applied to the SDN pin controls the EMA2203’s shutdown function. Activate micro-power shutdown by
applying VDD to the SDN pin. When active, the EMA2203’s micro-power shutdown feature turns off the amplifier’s bias
circuitry, reducing the supply current. The logic threshold is typically VDD/2. The low 0.1μA typical shutdown current is
achieved by applying a voltage that is as near as VDD as possible to the SDN pin. A voltage that is less than VDD may
increase the shutdown current. Table 1 shows the logic signal levels that activate and deactivate micro-power
shutdown and headphone amplifier operation.
Elite Semiconductor Memory Technology Inc./Elite MicroPower Inc.
Publication Date : Jun. 2009
Revision : 2.0
12/17

12 Page





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