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PDF EMA2202-50QE28GRR Data sheet ( Hoja de datos )
| Número de pieza | EMA2202-50QE28GRR | |
| Descripción | Stereo 2.4W Audio Power Amplifier | |
| Fabricantes | Elite Semiconductor | |
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ESMT/EMP
EMA2202
Stereo 2.4W Audio Power Amplifier
with DC Volume Control and Selectable Gain
GENERAL DESCRIPTION
The EMA2202 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 EMA2202 incorporates a DC volume control, stereo
bridged audio power amplifiers and a selectable gain
or bass boost, making it optimally suited for multimedia
monitors, portable radios, desktop, and portable
computer applications. The EMA2202 features an
externally controlled, low-power consumption shutdown
mode, and both power amplifier and headphone mute
for maximum system flexibility and performance.
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
． System Beep Detect
． Stereo switchable bridged/single-ended power
amplifiers
． Selectable internal/external gain and configurable
bass boost
． “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 : 4.0
1/17
1 page  
ESMT/EMP
TYPICAL APPLICATION CIRCUIT
EMA2202
Figure1. Typical Audio Power Amplifier Application Circuit
Elite Semiconductor Memory Technology Inc./Elite MicroPower Inc.
Publication Date : Jun. 2009
Revision : 4.0
5/17
5 Page 
ESMT/EMP
EMA2202
OPTIMIZING CLICK AND POP REDUCTION PERFORMANCE
The EMA2202 contains circuitry that minimizes turn-on and shutdown transients or “clicks and pop”. For this discussion,
turn-on refers to either applying the power supply voltage or when the shutdown mode is deactivated. While the
power supply is ramping to its final value, the EMA2202’s internal amplifiers are configured as unity gain buffers. An
internal current source changes the voltage of the BYPASS pin in a controlled, linear manner. Ideally, the input and
outputs track the voltage applied to the BYPASS pin. The gain of the internal amplifiers remains unity until the voltage
on the bypass pin reaches 1/2 VDD. As soon as the voltage on the bypass pin is stable, the device becomes fully
operational. Although the BYPASS pin current cannot be modified, changing the size of CBypass alters the device’s
turn-on time and the magnitude of “clicks and pops”. Increasing the value of CBypass reduces the magnitude of turn-on
pops. However, this presents a tradeoff: as the size of CBypass increases, the turn-on time increases. There is a linear
relationship between the size of CBypass and the turn-on time. Here are some typical turn-on times for various values of
CBypass:
CB
0.1 μF
0.22 μF
0.47 μF
1.0 μF
TON
30 ms
60 ms
150 ms
300 ms
In order eliminate “clicks and pops”, all capacitors must be discharged before turn-on. Rapidly switching VDD may not
allow the capacitors to fully discharge, which may cause “clicks and pops”. In a single-ended configuration, the
output is coupled to the load by COUT. This capacitor usually has a high value. COUT discharges through internal switch.
Depending on the size of COUT, the discharge time constant can be relatively large. To reduce transients in
single-ended mode, an external 1kΩ–5kΩ resistor RPULL can be placed in parallel with the load resistor. For EMA2202
operating in single-ended mode, turn-on time is typical 800ms with 1.0 μF BYPASS capacitor to reach good “clicks
and pops” elimination performance.
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 EMA2202 has two outputs, Pin
9 and Pin 13, which connect to outputs of the internal input amplifiers that drive the volume control inputs. These input
amplifiers can drive loads of >1kΩ (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 20kΩ devices 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)
Elite Semiconductor Memory Technology Inc./Elite MicroPower Inc.
Publication Date : Jun. 2009
Revision : 4.0
11/17
11 Page | ||
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