ESMT AD82550A-CG Stereo digital audio amplifier with headphone driver Datasheet

ESMT
AD82550A
Stereo Digital Audio Amplifier with Headphone Driver
Features
2
z 16/18/20/24-bit input with I S data format
z PSNR & DR (A-weighting)
Loudspeaker: 98dB (PSNR), 106dB (DR)
Headphone: 87dB (PSNR), 96dB (DR)
z Multiple sampling frequencies (Fs)
8kHz, 12kHz, 16kHz, 22.05kHz, 24kHz
32kHz, 44.1kHz, 48kHz,
64kHz, 88.2kHz and 96kHz
z System clock = 256Fs
z 8Fs switching for loudspeakers and headphones
z Single or dual supply
Single supply: 3.0~3.3V for the whole chip
Dual supply: 3.0~5V for loudspeaker drivers
3.0~3.3V for others
z Loudspeaker power
3.5W into 4Ω load @ 0dB 1kHz sinewave input
2.0W into 8Ω load @ 0dB 1kHz sinewave input
z Loudspeaker power efficiency (η)
86% for 4Ω @ 0dB 1kHz sinewave input
91% for 8Ω @ 0dB 1kHz sinewave input
z Headphone power
35mW into 32Ω @1kHz and 1% THD+N
65mW into 16Ω @1kHz and 1% THD+N
113mW into 8Ω @1kHz and 1% THD+N
z Volume control for loudspeakers
53steps:+6~-34dB(1dB/step)-36~-58dB(2dB/step)
z Mute function
z Power down function
z Anti-pop design
z Over-temperature protection
z Under-voltage shutdown
z Short-circuit detection
z CD and DVD
z TV audio
z Internet audio
z USB speaker
z MP3
z Headphone Amplifier
z PDA
z Portable / Handheld
z Mobile phone
z Car audio
Description
This is a stereo digital audio amplifier with high
power efficiency, which leads to longer battery life,
less heat sink requirement, smaller board size and
lower system cost. AD82550A can detect
headphone connection and choose to drive either
stereo loudspeakers or stereo headphones.
Operating with 3.0/3.3/5V loudspeaker driver supply,
each loudspeaker channel can typically deliver
0.8/1.0/2.3W to a 4Ω loudspeaker, respectively, with
less than 1% THD+N. Operating with 3.0/3.3V
headphone driver supply, each headphone channel
can typically deliver 29/35mW to 32Ω, 54/65mW to
16Ω and 94/113mW to 8Ω, respectively, with less
than 1% THD+N.
ORDERING INFORMATION
Product Number
Package
AD82550A-CG
24L SSOP 209mil
Comments
Pb-free
Applications
Functional Block Diagram
Elite Semiconductor Memory Technology Inc.
Publication Date: Apr. 2007
Revision:1.1
1/16
ESMT
AD82550A
Pin Assignment
Pin Description
Pin
Name
Type
Description
Characteristics
1
AGND
P
Analog ground
2
HPR
O
Headphone right channel output
3
HPL
O
Headphone left channel output
4
HP-SPK
I
Headphone/loudspeaker switch
5
DGND
P
Digital ground
6
DVDD
P
Digital supply
7
BCLK
I
Bit clock (64Fs) input
Schmitt trigger TTL input buffer
8
SDATA
I
Serial audio data input
Schmitt trigger TTL input buffer
9
LRCIN
I
Left/right sampling clock (Fs) input
Schmitt trigger TTL input buffer
10 PD/MUTE
I
Power-down and mute, low active
Schmitt trigger TTL input buffer
11
VOLUP
I
Volume up, low active
Schmitt trigger TTL input buffer (Note1)
12
VOLDN
I
Volume down, low active
Schmitt trigger TTL input buffer (Note1)
13
ERROR
O
Error output
Open-drain output
14
RESET
I
Reset, low active
Schmitt trigger TTL input buffer
15
GNDR
P
Ground for loudspeaker right channel
16
RB
O
Loudspeaker right channel output (-)
17
RA
O
Loudspeaker right channel output (+)
18
VDDR
P
Supply for loudspeaker right channel
19
VDDL
P
Supply for loudspeaker left channel
20
LA
O
Loudspeaker left channel output (+)
21
LB
O
Loudspeaker left channel output (-)
22
GNDL
P
Ground for loudspeaker left channel
23
MCLK
I
Master clock (256Fs) input
24
AVDD
P
Analog supply
Schmitt trigger input
with a 380kΩ pull-up resistor (Note 1)
Schmitt trigger TTL input buffer
Note1: May become bi-directional with less than 30μA output current when “ RESET ” pin is low.
Elite Semiconductor Memory Technology Inc.
Publication Date: Apr. 2007
Revision:1.1
2/16
ESMT
AD82550A
Absolute Maximum Ratings
Symbol
DVDD
AVDD
VDDL(R)
Vi
Tstg
Ta
Parameter
Supply for Digital Circuit
Supply for Analog Circuit
Supply for Left (Right) Channel
Input Voltage
Storage Temperature
Ambient Operating Temperature
Voltage Difference between VDDL and VDDR
Voltage Difference between VDDL(VDDR) and DVDD/AVDD
VDDL(VDDR) Power-on Voltage Ramp
Min
0
0
0
-0.3
-65
0
-1
-3
Max
3.6
3.6
5.5
3.6
150
70
1
3
0.2
Units
V
V
V
V
o
C
o
C
V
V
V/μs
Recommended Operating Conditions
Symbol
Parameter
Typ
Units
DVDD
Supply for Digital Circuit
3.0~3.3
V
AVDD
Supply for Analog Circuit
3.0~3.3
V
VDDL(R)
Supply for Driver Stage
3.0~5.0
Ta
Ambient Operating Temperature
0~70
V
o
C
Digital Characteristics
Symbol
Parameter
Min
VIH
High-Level Input Voltage
2.0
VIL
Low-Level Input Voltage
VOH
High-Level Output Voltage
VOL
Low-Level Output Voltage
CI
Input Capacitance
Typ
Max
Units
V
0.8
V
2.4
V
0.4
V
6.4
pF
General Electrical Characteristics
Symbol
Parameter
Condition
IPD
Supply Current during Power Down
36
Junction Temperature for Driver Shutdown
150
o
Temperature Hysteresis for Recovery from Shutdown
20
o
UVH
Under Voltage Disabled (For AVDD)
2.8
V
UVL
Under Voltage Enabled (For AVDD)
2.7
V
Fsw
Switching Rate of Loudspeakers and Headphones
8Fs
8Fs
8Fs
Hz
TPWM
Minimum PWM pulse width
1
256Fs
1
256Fs
1
256Fs
Sec
RSC
Loudspeaker Short-Circuit Detection (Note2)
2.8
3.2
Ω
VDDR(L)=5V
Min
Typ Max
Units
μA
C
C
RSCH
Headphone Output Short-Circuit Detection
Steady State
3.0 3.4
Ω
Note2: Loudspeaker short-circuit protection is effective only when external LC or ferrite bead filters are
properly used. Long time short-circuit will reduce device reliability. AD82550A protects itself from
short-circuit damage only when the lines connected to speaker are shorted to each other or to GND.
AD82550A will be burnt if the lines connected to loudspeaker are shorted to VDDL(VDDR).
Package Options
Package Type
Part Number
24L SSOP 209mil AD82550A-CG
Thermal Information
θJA = 64.7 oC/W (Condition: still air, multilayer board)
Elite Semiconductor Memory Technology Inc.
Publication Date: Apr. 2007
Revision:1.1
3/16
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