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ESMT
Preliminary
AD5265A
2.5W/CH Stereo Filter-less Class-D Audio Amplifier with
Headphone Driver
Features
z Supply voltage range: 2.5 V to 5.5 V
z Support single-ended or differential analog input
z Low static operation current
z Low shut-down current
z Short power-on transient time
z Two volume control modes
„ DC volume control from -38dB to +20dB
„ 4-step volume gain of +6, +12, +18, +24dB
z Independent shut-down control for left or right
channel
z Short-circuit and thermal protection
z Loudspeaker power within 10% THD+N
„ 1.5W/ch into 8Ω loudspeaker
„ 2.5W/ch into 4Ω loudspeaker
z Loudspeaker efficiency
„ 90% @ 8Ω, Po,10% THD+N
„ 85% @ 4Ω, Po,10% THD+N
z Headphone power within 1% THD+N
„ 120mW/ch into 16Ω headphone
Applications
z Monitor audio
z PDA
z Portable multimedia devices
z Notebook computer
z Mobile phone
Description
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.
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.
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.
Ordering Information
Part Number
Package
AD5265A-SEG E-TSSOP 24L
Comments
Pb-free
Elite Semiconductor Memory Technology Inc.
Publication Date: Aug. 2008
Revision: 0.4
1/25

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ESMT
Pin Assignments
Preliminary
AD5265A
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
with 300 kΩ pull-low resistor
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 (-)
Thermal Pad G Must be soldered to PCB’s ground plane
Elite Semiconductor Memory Technology Inc.
Publication Date: Aug. 2008
Revision: 0.4
2/25