4990WXYZ View Datasheet(PDF) - Unspecified
Part Name
Description
Manufacturer
4990WXYZ Datasheet PDF : 16 Pages
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October 2008
AUD4990
2W Audio Power Amplifier with Selectable Shutdown
General Description
The AUD4990 is an audio power amplifier for mobile phone
and other portable electronic device applications. It can
deliver 1.3 watts of continuous average power to an 8 ohm
BTL (bridge tied load) and 2 watts of continuous average
power to a 4 ohm BTL, with less than 1% distortion from a 5V
DC power supply.
The AUD4990 is specifically designed to provide high output
power with a minimal amount of external components. It
requires no output coupling capacitors, for instance. Because
of its space-saving footprint, it perfectly meets the needs of
mobile phones, PDAs, notebook computers and other
low-voltage applications that require small power sources in
a small package.
The AUD4990 can offer a low standby current and a zero
shutdown current. Furthermore, the amplifier’s startup time is
fast enough to use its shutdown mode as a mute function.
The AUD4990 features circuitry that eliminates pop-and-click
noise whenever the device is turned on or off.
Key Specifications
Wide Power Supply
Voltage Range
Typical THD at 1W, 8Ω
High PSRR
Low Quiescent Current
Features
Space Saving Thermal Package
Active High or Low Shutdown Mode
External Gain Configuration
Stable Unity Gain
Can Drive CL up to 200pF
Applications
Mobile Phones
PDAs
Notebook Computers
Portable Electronic Devices
2.7V < VDD < 5.5
0.2% (typ)
68 dB (typ)
2.5 mA (typ)
Typical Application
Audio
Input
RF
20kΩ
Ri
20 kΩ
Ci
0.39µF
+
CB
1.0µF
Shutdown Control
Shutdown Mode ShutDown Status
GND
GND
V DD
V DD
0
Shutdown
1
On
0
On
1
Shutdown
- IN
+ IN
Bypass
VDD
+
CS
1.0µF
_
+
20kΩ
20kΩ
_
VDD/2
+
Shut D ow n
SD Mode
GND
VO1 -
RL
8Ω
VO2 +
100
10
1
0.1
0.0110-4
10-3
10-2
10-1
100
Output Power (W)
Figure 1 Audio Power Amplifier with AV = 2
http://www.analogexpress.com
1
Figure 2 THD + N vs Output Power
V1.49
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