ESMT Preliminary AD52651A 2.5W/CH Stereo Filter-less Class-D Audio Amplifier with Headphone Driver Features Description z z z z z z The AD52651A is a stereo, filter-less class-D audio amplifier with headphone driver. Operating with 5.0V loudspeaker driver supply, it can deliver 2.5W/CH output power into 4 Ω loudspeaker within 10% THD+N and 120mW/CH output power into 16Ω headphone within 1% THD+N. z z z z z Supply voltage range: 2.5 V to 5.5 V Support single-ended or differential analog input Low static operation current Low shut-down current Short power-on transient time Two volume control modes DC volume control from -38dB to +20dB 4-step volume gain of +6, +12, +18, +24dB Independent power-down control for left or right channel Overload and thermal protection Loudspeaker power within 10% THD+N 1.5W/ch into 8Ω loudspeaker 2.5W/ch into 4Ω loudspeaker Loudspeaker efficiency 89% @ 8Ω, Po,10% THD+N 84% @ 4Ω, Po,10% THD+N Headphone power within 1% THD+N 120mW/ch into 16Ω headphone Applications z z z z z Monitor audio PDA Portable multimedia devices Notebook computer Mobile phone The AD52651A has two volume control modes by setting MODE pin. While MODE pin is set logic high, AD52651A is in DC volume control mode with 31-step volume gain from -38 dB to +20dB, adjusted by the DC voltage applied on G0 pin. Otherwise, AD52651A is the 4-step volume gain mode with +6dB, +12dB, +18dB, and +24dB gain, selected by setting G0 and G1 pins. The two volume adjustment modes are designed to fit the different volume control requirements in various applications. Beside stereo class-D amplifier, AD52651 has built-in an inverted stereo class-AB headphone driver. With the independent power-down control for left or right channel, the AD52651 is more convenient to control the left and right channels. The AD52651A packaged as E-TSSOP 24L is a stereo audio amplifier with high efficiency, which leads to longer battery left, less heat sink requirement, smaller board size and lower system cost, and suitable for the notebook computer, and portable multimedia devices. Functional Block Diagram Elite Semiconductor Memory Technology Inc. Publication Date: Sep. 2007 Revision: 0.1 1/20 ESMT Preliminary AD52651A Pin Assignments Pin Description NAME TYP DESCRIPTION CHARACTERISTIC 1 INL- I Left channel Input (-) 2 INL+ I Left channel Input (+) 3 HP_SPK I 0: SPK mode; 1: HP mode with 300 kΩ pull-high resistor 4 G1 I Gain selection with 300 kΩ pull-low resistor 5 HPL O Left channel headphone driver 6 OUTL+ O Left channel output (+) 7 PVDDL P High current power supply 8 PGNDL G High current ground 9 OUTL- O Left channel output (-) 10 AGND G Ground 11 MODE I 4-gain/DC Vol. control with 300 kΩ pull-low resistor 12 SDL# I Shut-down left channel with 300 kΩ pull-low resistor 13 SDR# I Shut-down right channel with 300 kΩ pull-low resistor 14 AVDD P Power supply 15 N.C. x N.C. 16 OUTR- O Right channel output (-) 17 PGNDR G High current ground 18 PVDDR P High current power supply 19 OUTR+ O Right channel output (+) 20 HPR O Right channel headphone driver 21 G0 I Gain selection/DC vol. level 22 VREF O Reference voltage 23 INR+ I Right channel Input (+) 24 INR- I Right channel Input (-) G Must be soldered to PCB’s ground plane Thermal Pad Elite Semiconductor Memory Technology Inc. Publication Date: Sep. 2007 Revision: 0.1 2/20 ESMT Preliminary AD52651A Available Package Package Type Device no. θJA (oC/W) Exposed Thermal Pad E-TSSOP 24L AD52651A 43.8 Yes (Note1) Note1: The thermal pad is at the bottom of package. To optimize the performance of thermal dissipation, solder the thermal pad to PCB’s ground plane is suggested. Absolute Maximum Ratings SYMBOL PARAMETER MIN MAX UNIT AVDD Power supply for lower power analog cells 2.5 5.5 V PVDDL(R) Power supply for loudspeaker driver 2.5 5.5 V Input voltage -0.3 AVDD Tstg Ta Storage temperature -65 Ambient operating temperature V o C 150 0 o C 70 Recommended Operating Conditions SYMBOL PARAMETER TYP UNIT AVDD Power supply for lower power analog cells 2.5~5.0 V PVDDL(R) Power supply for Driver Stage 2.5~5.0 V VIH High-Level Input Voltage 2.0 V VIL Low-Level Input Voltage 0.8 Ta Ambient Operating Temperature V o C 0~70 General Electrical Characteristics SYMBOL IPD_SKP IPD_HP Voffset fsw RSC PARAMETER CONDITION Supply current during power-down mode @ Speaker mode Supply current during power-down mode @ Headphone mode Output offset voltage @ Speaker mode AVDD=PVDDR(L)=5.0V; HP_SPK=0V; SDL#=SDR#=0V AVDD=PVDDR(L)=5.0V; HP_SPK=5V; SDL#=SDR#=0V Input ac grounded, VDD=2.5V~5.0V MIN TYP MAX UNIT 20 50 μA 1 10 μA 5 25 mV Junction temperature for driver shutdown 145 150 155 Temperature hysteresis for recovery from shutdown 115 120 125 Switching rate of loudspeakers driver 300 450 600 kHz 2.8 3.2 Ω Loudspeaker short-circuit PVDDR(L) = 5 V detect resistance Elite Semiconductor Memory Technology Inc. o C o C Publication Date: Sep. 2007 Revision: 0.1 3/20