ESMT AD52651A 2.5w/ch stereo filter-less class-d audio amplifier with headphone driver Datasheet

ESMT
Preliminary
AD52651A
2.5W/CH Stereo Filter-less Class-D Audio Amplifier with
Headphone Driver
Features
Description
z
z
z
z
z
z
The AD52651A 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.
z
z
z
z
z
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 power-down control for left or right
channel
Overload and thermal protection
Loudspeaker power within 10% THD+N
„ 1.5W/ch into 8Ω loudspeaker
„ 2.5W/ch into 4Ω loudspeaker
Loudspeaker efficiency
„ 89% @ 8Ω, Po,10% THD+N
„ 84% @ 4Ω, Po,10% THD+N
Headphone power within 1% THD+N
„ 120mW/ch into 16Ω headphone
Applications
z
z
z
z
z
Monitor audio
PDA
Portable multimedia devices
Notebook computer
Mobile phone
The AD52651A has two volume control modes by
setting MODE pin. While MODE pin is set logic high,
AD52651A 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,
AD52651A 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. Beside
stereo class-D amplifier, AD52651 has built-in an
inverted stereo class-AB headphone driver. With the
independent power-down control for left or right
channel, the AD52651 is more convenient to control
the left and right channels.
The AD52651A packaged as E-TSSOP 24L is a
stereo audio amplifier with high efficiency, which
leads to longer battery left, less heat sink
requirement, smaller board size and lower system
cost, and suitable for the notebook computer, and
portable multimedia devices.
Functional Block Diagram
Elite Semiconductor Memory Technology Inc.
Publication Date: Sep. 2007
Revision: 0.1
1/20
ESMT
Preliminary
AD52651A
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
with 300 kΩ pull-high resistor
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
4-gain/DC Vol. control
with 300 kΩ pull-low resistor
12
SDL#
I
Shut-down left channel
with 300 kΩ pull-low resistor
13
SDR#
I
Shut-down right channel
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/DC vol. level
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.
Publication Date: Sep. 2007
Revision: 0.1
2/20
ESMT
Preliminary
AD52651A
Available Package
Package Type
Device no.
θJA (oC/W)
Exposed Thermal Pad
E-TSSOP 24L
AD52651A
43.8
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
-65
Ambient operating temperature
V
o
C
150
0
o
C
70
Recommended Operating Conditions
SYMBOL
PARAMETER
TYP
UNIT
AVDD
Power supply for lower power analog cells
2.5~5.0
V
PVDDL(R)
Power supply for Driver Stage
2.5~5.0
V
VIH
High-Level Input Voltage
2.0
V
VIL
Low-Level Input Voltage
0.8
Ta
Ambient Operating Temperature
V
o
C
0~70
General Electrical Characteristics
SYMBOL
IPD_SKP
IPD_HP
Voffset
fsw
RSC
PARAMETER
CONDITION
Supply current during
power-down mode
@ Speaker mode
Supply current during
power-down mode
@ Headphone mode
Output offset voltage
@ Speaker mode
AVDD=PVDDR(L)=5.0V;
HP_SPK=0V;
SDL#=SDR#=0V
AVDD=PVDDR(L)=5.0V;
HP_SPK=5V;
SDL#=SDR#=0V
Input ac grounded,
VDD=2.5V~5.0V
MIN
TYP
MAX
UNIT
20
50
μA
1
10
μA
5
25
mV
Junction temperature for
driver shutdown
145
150
155
Temperature hysteresis for
recovery from shutdown
115
120
125
Switching rate of
loudspeakers driver
300
450
600
kHz
2.8
3.2
Ω
Loudspeaker short-circuit
PVDDR(L) = 5 V
detect resistance
Elite Semiconductor Memory Technology Inc.
o
C
o
C
Publication Date: Sep. 2007
Revision: 0.1
3/20
Similar pages