Headphone Driver

ESMT
Preliminary
AD5265A
2.5W/CH Stereo Filter-less Class-D Audio Amplifier with
Headphone Driver
Features
Description
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The AD5265A is a stereo, filter-less class-D audio
amplifier with headphone driver. Operating with 5.0V
loudspeaker driver supply, it can deliver 2.5W/CH
output power into 4 Ω loudspeaker within 10%
THD+N and 120mW/CH output power into 16Ω
headphone within 1% THD+N.
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Supply voltage range: 2.5 V to 5.5 V
Support single-ended or differential analog input
Low static operation current
Low shut-down current
Short power-on transient time
Two volume control modes
„ DC volume control from -38dB to +20dB
„ 4-step volume gain of +6, +12, +18, +24dB
Independent shut-down control for left or right
channel
Short-circuit and thermal protection
Loudspeaker power within 10% THD+N
„ 1.5W/ch into 8Ω loudspeaker
„ 2.5W/ch into 4Ω loudspeaker
Loudspeaker efficiency
„ 90% @ 8Ω, Po,10% THD+N
„ 85% @ 4Ω, Po,10% THD+N
Headphone power within 1% THD+N
„ 120mW/ch into 16Ω headphone
The AD5265A packaged as E-TSSOP 24L is a
stereo audio amplifier with high efficiency, which
leads to longer battery life, less heat sink
requirement, smaller board size and lower system
cost, and suitable for the notebook computer, and
portable multimedia devices. With the independent
shut-down control for left or right channel, the
AD5265A is more convenient to control the left and
right channels.
Applications
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The AD5265A has two volume control modes by
setting MODE pin. While MODE pin is set logic high,
AD5265A is in DC volume control mode with 31-step
volume gain from -38 dB to +20dB, adjusted by the
DC voltage applied on G0 pin. Otherwise, AD5265A
is the 4-step volume gain mode with +6dB, +12dB,
+18dB, and +24dB gain, selected by setting G0 and
G1 pins. The two volume adjustment modes are
designed to fit the different volume control
requirements in various applications. Not only the
stereo class-D amplifier, AD5265A also has a fixed
gain (-1V/V) stereo class-AB headphone driver.
Monitor audio
PDA
Portable multimedia devices
Notebook computer
Mobile phone
Ordering Information
Part Number
Package
Comments
AD5265A-SEG
E-TSSOP 24L
Pb-free
Elite Semiconductor Memory Technology Inc.
Publication Date: Aug. 2008
Revision: 0.4
1/25
ESMT
Preliminary
AD5265A
Pin Assignments
Pin Description
NAME
TYP
DESCRIPTION
CHARACTERISTIC
1
INL-
I
Left channel Input (-)
2
INL+
I
Left channel Input (+)
3
HP_SPK
I
0: SPK mode; 1: HP mode
4
G1
I
Gain selection
5
HPL
O
Left channel headphone driver
6
OUTL+
O
Left channel output (+)
7
PVDDL
P
High current power supply
8
PGNDL
G
High current ground
9
OUTL-
O
Left channel output (-)
10
AGND
G
Ground
11
MODE
I
0: 4-gain control; 1:DC Vol. control
with 300 kΩ pull-low resistor
12
SDL
I
Shut-down left channel (Low active)
with 300 kΩ pull-low resistor
13
SDR
I
Shut-down right channel (Low active)
with 300 kΩ pull-low resistor
14
AVDD
P
Power supply
15
N.C.
x
N.C.
16
OUTR-
O
Right channel output (-)
17
PGNDR
G
High current ground
18
PVDDR
P
High current power supply
19
OUTR+
O
Right channel output (+)
20
HPR
O
Right channel headphone driver
21
G0
I
Gain selection(mode=0) /DC vol. level(mode=1)
22
VREF
O
Reference voltage
23
INR+
I
Right channel Input (+)
24
INR-
I
Right channel Input (-)
G
Must be soldered to PCB’s ground plane
Thermal Pad
Elite Semiconductor Memory Technology Inc.
with 300 kΩ pull-low resistor
Publication Date: Aug. 2008
Revision: 0.4
2/25
ESMT
Preliminary
AD5265A
Functional Block Diagram
Available Package
Package Type
Device no.
θJA (oC/W)
Exposed Thermal Pad
E-TSSOP 24L
AD5265A
32.3
Yes (Note1)
Note1: The thermal pad is at the bottom of package. To optimize the performance of thermal
dissipation, solder the thermal pad to PCB’s ground plane is suggested.
Absolute Maximum Ratings
SYMBOL
PARAMETER
MIN
MAX
UNIT
AVDD
Power supply for lower power analog cells
2.5
5.5
V
PVDDL(R)
Power supply for loudspeaker driver
2.5
5.5
V
Input voltage
-0.3
AVDD
Tstg
Ta
Storage temperature
Ambient operating temperature
Elite Semiconductor Memory Technology Inc.
-65
0
150
70
V
o
C
o
C
Publication Date: Aug. 2008
Revision: 0.4
3/25