ESMT AD82550A
Elite Semiconductor Memory Technology Inc. Publication Date
Apr. 2007
Revision
1.1 1/16
Stereo Digital Audio Amplifier with Headphone Driver
Features
z 16/18/20/24-bit input with I2S 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
Applications
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
16 and 94/113mW to 8Ω, respectively, with less
than 1% THD+N.
ORDERING INFORMATION
Product Number Package Comments
AD82550A-CG 24L SSOP 209mil Pb-free
Functional Block Diagram
ESMT AD82550A
Elite Semiconductor Memory Technology Inc. Publication Date
Apr. 2007
Revision
1.1 2/16
Pin Assignment
Pin Description
Note1: May become bi-directional with less than 30μA output current when “ RESET ” pin is low.
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 Schmitt trigger input
with a 380kΩ pull-up resistor (Note 1)
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 Schmitt trigger TTL input buffer
24 AVDD P Analog supply
ESMT AD82550A
Elite Semiconductor Memory Technology Inc. Publication Date
Apr. 2007
Revision
1.1 3/16
Absolute Maximum Ratings
S
y
mbol Parameter Min Max Units
DVDD Supply for Digital Circuit 0 3.6 V
AVDD Supply for Analog Circuit 0 3.6 V
VDDL(R) Supply for Left (Right) Channel 0 5.5 V
Vi Input Voltage -0.3 3.6 V
Tstg Storage Temperature -65 150 oC
Ta Ambient Operating Temperature 0 70 oC
Voltage Difference between VDDL and VDDR -1 1 V
Voltage Difference between VDDL(VDDR) and DVDD/AVDD -3 3 V
V
DDL(VDDR) Power-on Voltage Ramp 0.2 V/μs
Recommended Operating Conditions
Digital Characteristics
Symbol Parameter Min Typ Max Units
VIH High-Level Input Voltage 2.0 V
VIL Low-Level Input Voltage 0.8 V
VOH High-Level Output Voltage 2.4 V
VOL Low-Level Output Voltage 0.4 V
CI Input Capacitance 6.4 pF
General Electrical Characteristics
Symbol Parameter Condition Min Typ Max Units
IPD Supply Current during Power Down 36 μA
Junction Temperature for Driver Shutdown 150 oC
Temperature Hysteresis for Recovery from Shutdown 20 oC
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 Sec
RSC Loudspeaker Short-Circuit Detection (Note2) VDDR(L)=5V 2.8 3.2 Ω
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
Packa
g
e T
y
pe Part Number Thermal Information
24L SSOP 209mil AD82550A-CG θJA = 64.7 oC/W (Condition: still air, multilayer board)
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 V
Ta Ambient Operating Temperature 0~70 oC
256Fs
1
256Fs
1
256Fs
1