ESMT AD82550A Stereo Digital Audio Amplifier with Headphone Driver Features Applications 16/18/20/24-bit input with I2S 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 2.5~5.5V tolerant input interface Loudspeaker power 3.5W into 4Ω load @ 0dB 1kHz sinewave input 2.0W into 8Ω load @ 0dB 1kHz sinewave input Loudspeaker power efficiency (η) 86% for 4Ω @ 0dB 1kHz sinewave input 91% for 8Ω @ 0dB 1kHz sinewave input 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 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 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 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 Functional Block Diagram Headphone Driver PD/MUTE RESET MCLK BCLK LRCIN SDATA Input Interface Audio Data Processing or Protection Circuits PCM to PWM Elite Semiconductor Memory Technology Inc. ERROR VOLUP VOLDN HP-SPK Loudspeaker Driver Publication Date : Nov. 2005 Revision : 1.0 1/2 ESMT AD82550A Pin Assignment AGND 1 24 AVDD HPR 2 23 MCLK HPL 3 22 HP-SPK DGND 4 21 GNDL LB 5 20 LA DVDD 6 19 VDDL BCLK 7 18 SDATA 8 17 LRCIN 9 16 VDDR RA RB 10 15 GNDR VOLUP 11 14 VOLDN 12 13 RESET ERROR PD/MUTE 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 5V tolerant Schmitt trigger TTL input buffer 8 SDATA I Serial audio data input 5V tolerant Schmitt trigger TTL input buffer 9 LRCIN I Left/right sampling clock (Fs) input 5V tolerant Schmitt trigger TTL input buffer 10 PD/MUTE I Power-down and mute, low active 5V tolerant Schmitt trigger TTL input buffer 11 VOLUP I Volume up, low active 5V tolerant Schmitt trigger TTL input buffer (Note1) 12 VOLDN I Volume down, low active 5V tolerant Schmitt trigger TTL input buffer (Note1) 13 ERROR O Error output Open-drain output 14 RESET I Reset, low active 5V tolerant 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 5V tolerant Schmitt trigger input with a 380kΩ pull-up resistor (Note 1) 5V tolerant 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 : Nov. 2005 Revision : 1.0 2/2