ESMT
AD62550A
Class-D Audio Power Amplifier with USB / I
2
S Interface
Features
Compliant with USB Specification v1.1, and USB
2.0 full speed
Embedded high efficiency, high performance class
D stereo amplifier
Support I
2
S input and I
2
S output interface of
master mode
Sampling frequencies(Fs)：48kHz
+6dB enhancement(Theater function)
Support both bus-powered and self-powered
operation
Supports Win Me//2000/XP and MacOS
True plug-and-play application, no driver is
required for basic USB speaker application
Support volume/mute control with external button
Built-in 5V to 3.3V regulator for internal device
operation
Total efficiency
80% for 8Ω load @ -1dB 1kHz sine wave input
Loudspeaker PSNR & DR (A-weighting)
80dB (PSNR), 78dB (DR) with Bead filter
82dB (PSNR), 78dB (DR) with Chock filter
Anti-pop design
Over-temperature protection
Under-voltage shutdown
Short-circuit detection
12 MHz Crystal Input
32-pin LQFP(Pb free)
Description
AD62550A is a single chip of Class-D audio
amplifier with USB/I
2
S interface. When using the
power supplied from the USB port, AD62550A can
drive a pair of up to 1W speakers due to the built-in,
high efficiency and high performance class D
amplifiers. The device also has an I
2
S input port and
I
2
S output port. The I
2
S input port allows other
external audio sources to use the class D amplifier
to share the speakers. The I
2
S output port allows
other high performance audio device (i.e.
AD8356A/AD8256A) to be controlled by AD62550A.
Functional Block Diagram
Elite Semiconductor Memory Technology Inc.
Publication Date: Apr. 2007
Revision: 1.3
1/14
ESMT
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
USB/I
2
S
AD62550A
I
I
NC
O
I
P
O
P
I/O
I/O
I
I
I
I
O
I
Low is USB mode, high is I
2
S mode
Mode selection bit
No connection
Crystal output
Crystal input
Ground
3.3V regulator output
5V supply voltage
USB data D-
USB data D+
Theater mode, high active
Volume down, low active
Volume up, low active
Power-down and mute of Class D
Error output
Reset signal
Schmitt trigger TTL input buffer
With internal pull-up resistor
With internal pull-up resistor
Schmitt trigger TTL input buffer
Open-Drain output
Schmitt trigger TTL input buffer
Schmitt trigger TTL input buffer
Schmitt trigger TTL input buffer
SEL
NC
XO
XI
GND
REGO
VDD
USBDM
USBDP
THEATER
VOLDN
VOLUP
MUTE
ERROR
RESET
Note1: Must be strapped resistor 1MΩ to 3.3V(REGO) or GND. BCLK, LRCIN and
PDO
must be strapped
to GND. SDATAO is strapped to GND by 1MΩ when AD62550A’s volume/mute is controlled by
external button, otherwise strapped to 3.3V when AD62550A is I
2
C slave mode for SEL1 is logic
LOW.
Absolute Maximum Ratings
Symbol
VDD
VDDL(R)
V
i
T
stg
T
a
Parameter
Supply for regulator input
Supply for Left (Right) Channel
Input Voltage
Storage Temperature
Ambient Operating Temperature
Voltage Difference between V
DDL
and V
DDR
Voltage Difference between V
DDL
(V
DDR
) and DVDD/AVDD
V
DDL
(V
DDR
) Power-on Voltage Ramp
Min
0
0
-0.3
-65
0
-1
-3
Max
5.5
5.5
3.6
150
70
1
3
0.2
Units
V
V
V
o
C
o
C
V
V
V/μs
Recommended Operating Conditions
Symbol
VDD
VDDL(R)
T
a
Parameter
Supply for regulator input
Supply for Driver Stage
Ambient Operating Temperature
Typ
4.5~5.5
3.0~5.0
0~70
Units
V
V
o
C
Elite Semiconductor Memory Technology Inc.
Publication Date: Apr. 2007
Revision: 1.3
3/14
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