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