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ESMT
Features
16/18/20/24-bit input with I S data format PSNR & DR (A-weighting) Loudspeaker: 98dB (PSNR), 106dB (DR) Headphone: 87dB (PSNR), 96dB (DR) Multiple sampling frequencies (Fs) 8kHz, 12kHz, 16kHz, 22.05kHz, 24kHz 32kHz, 44.1kHz, 48kHz, 64kHz, 88.2kHz and 96kHz System clock = 256Fs 8Fs switching for loudspeakers and headphones 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 Loudspeaker power 3.5W into 4 load @ 0dB 1kHz sinewave input 2.0W into 8 load @ 0dB 1kHz sinewave input Loudspeaker power efficiency () 86% for 4 @ 0dB 1kHz sinewave input 91% for 8 @ 0dB 1kHz sinewave input Headphone power 35mW into 32 @1kHz and 1% THD+N 65mW into 16 @1kHz and 1% THD+N 113mW into 8 @1kHz and 1% THD+N Volume control for loudspeakers 53steps:+6~-34dB(1dB/step)-36~-58dB(2dB/step) Mute function Power down function Anti-pop design Over-temperature protection Under-voltage shutdown Short-circuit detection
2
AD82550A
Stereo Digital Audio Amplifier with Headphone Driver
CD and DVD TV audio Internet audio USB speaker MP3 Headphone Amplifier PDA Portable / Handheld Mobile phone 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 4 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 32, 54/65mW to 16 and 94/113mW to 8, respectively, with less than 1% THD+N.
ORDERING INFORMATION
Product Number AD82550A-CG Package 24L SSOP 209mil Comments Pb-free
Applications Functional Block Diagram
Elite Semiconductor Memory Technology Inc.
Publication Date Apr. 2007 Revision1.1 1/16
ESMT
Pin Assignment
AD82550A
Pin Description
Pin 1 2 3 4 5 6 7 8 9 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Name AGND HPR HPL HP-SPK DGND DVDD BCLK SDATA LRCIN VOLUP VOLDN ERROR
RESET
Type P O O I P P I I I I I I O I P O O P P O O P I P
Description Analog ground Headphone right channel output Headphone left channel output Headphone/loudspeaker switch Digital ground Digital supply Bit clock (64Fs) input Serial audio data input Left/right sampling clock (Fs) input Power-down and mute, low active Volume up, low active Volume down, low active Error output Reset, low active Ground for loudspeaker right channel Loudspeaker right channel output (-) Loudspeaker right channel output (+) Supply for loudspeaker right channel Supply for loudspeaker left channel Loudspeaker left channel output (+) Loudspeaker left channel output (-) Ground for loudspeaker left channel Master clock (256Fs) input Analog supply
Characteristics
Schmitt trigger input with a 380k pull-up resistor (Note 1)
Schmitt trigger TTL input buffer Schmitt trigger TTL input buffer Schmitt trigger TTL input buffer Schmitt trigger TTL input buffer Schmitt trigger TTL input buffer (Note1) Schmitt trigger TTL input buffer (Note1) Open-drain output Schmitt trigger TTL input buffer
10 PD/MUTE
GNDR RB RA VDDR VDDL LA LB GNDL MCLK AVDD
Schmitt trigger TTL input buffer
Note1: May become bi-directional with less than 30A output current when " RESET " pin is low.
Elite Semiconductor Memory Technology Inc.
Publication Date Apr. 2007 Revision1.1 2/16
ESMT
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 Parameter Supply for Digital Circuit Supply for Analog Circuit Supply for Driver Stage Ambient Operating Temperature Parameter High-Level Input Voltage Low-Level Input Voltage High-Level Output Voltage Low-Level Output Voltage Input Capacitance 6.4 2.4 0.4 Typ 3.0~3.3 3.0~3.3 3.0~5.0 0~70 Min 2.0 0.8 Units V V V
o
AD82550A
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/s
Recommended Operating Conditions
Symbol DVDD AVDD VDDL(R) Ta Symbol VIH VIL VOH VOL CI Symbol IPD
C Typ Max Units V V V V pF
Digital Characteristics
General Electrical Characteristics
Parameter Supply Current during Power Down Junction Temperature for Driver Shutdown Temperature Hysteresis for Recovery from Shutdown UVH UVL Fsw TPWM RSC Under Voltage Disabled (For AVDD) Under Voltage Enabled (For AVDD) Switching Rate of Loudspeakers and Headphones Minimum PWM pulse width Loudspeaker Short-Circuit Detection (Note2) VDDR(L)=5V 8Fs
1 256Fs
Condition
Min
Typ Max 36 150 20 2.8 2.7 8Fs
1 256Fs
Units A
o o
C C
V V 8Fs
1 256Fs
Hz Sec
2.8
3.2
RSCH Headphone Output Short-Circuit Detection Steady State 3.0 3.4 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 JA = 64.7 oC/W (Condition: still air, multilayer board)
Elite Semiconductor Memory Technology Inc.
Publication Date Apr. 2007 Revision1.1 3/16

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