芯美电子 EUA2012 2.7-W/CH Stereo Filter-less Class-D Audio Power Amplifier DESCRIPTION FEATURES The EUA2012 is a high efficiency, 2.7W/channel stereo class-D audio power amplifier. A low noise, filterless PWM architecture eliminates the output filter, requiring only two external components for operation. z z Operating from a single 5V supply, EUA2012 is capable of delivering 2.7W/ channel of continuous output power to a 4Ω load with 10% THD+N. z z z z z z z z The EUA2012 features independent shutdown controls for each channel. The gain can be selected to 6, 12, 18, or 24 dB utilizing the G0 and G1 gain select pins. High PSRR and differential architecture provide increased immunity to noise and RF rectification. The EUA2012 is available in space-saving WCSP and TQFN packages, is an idea choice for mobile phones and other portable communication devices. z z z Unique Modulation Scheme Reduces EMI Emission Output Power By TQFN Package - 2.7W/Ch Into 4Ω at 5V - 1.6W/Ch Into 8Ω at 5V - 800mW/Ch Into 8Ω at 3.6V Only Two External components Required Wide Supply Voltage: 2.5V to 5.5V Independent Shutdown Control for Each Channel Selectable Gain of 6,12,18 and 24 dB Internal Pulldown Resistor On Shutdown Pins High PSRR :74dB at 217Hz Fast 10ms Startup Time Low 5mA Quiescent Current at 3.6V Supply and 1.5µA Shutdown Current Short-Circuit and Thermal Protection Space Saving Packages - 4mm × 4mm TQFN-20 package - 2mm × 2mm WCSP-16 package RoHS Compliant and 100% Lead(Pb)-Free APPLICATIONS z z z Wireless or Cellular Handsets and PDAs Portable Audios Notebook PC Typical Application Circuit Figure1. DS2012 Ver 0.2 Nov. 2007 1 联系电话：１５９９９６４４５７９ ８３１５１７１５ 芯美电子 EUA2012 Pin Configurations Package Type Pin Configurations Package Type Pin Configurations WCSP-16 TQFN-20 Pin Description PIN TQFN-20 WCSP-16 I/O INR+ 16 D1 I Right channel positive input INR- 17 C1 I Right channel negative input INL+ 20 A1 I Left channel positive input INL- 19 B1 I Left channel negative input SDR 8 B3 I Right channel shutdown terminal (active low) SDL 7 B4 I Left channel shutdown terminal (active low) G0 15 C2 I Gain select (LSB) G1 1 B2 I Gain select (MSB) PVDD 3,13 A2 I Power supply (Must be same voltage as AVDD) AVDD 9 D2 I Analog supply (Must be same voltage as PVDD) PGND 4,12 C4 I Power ground AGND 18 C3 I Analog ground OUTR+ 14 D3 O Right channel positive differential output OUTR- 11 D4 O Right channel negative differential output OUTL+ 2 A3 O Left channel positive differential output OUTL- 5 A4 O Left channel negative differential output NC 6,10 - - No internal connection DS2012 Ver 0.2 Nov. 2007 DESCRIPTION 2 联系电话：１５９９９６４４５７９ ８３１５１７１５ 芯美电子 EUA2012 Ordering Information Order Number Package Type EUA2012HIR1 WCSP-16 EUA2012JIR1 TQFN-20 Marking xxx d0 xxxxx A2012 Operating Temperature range -40 °C to 85°C -40 °C to 85°C EUA2012 □ □ □ □ Lead Free Code 1: Lead Free 0: Lead Packing R: Tape & Reel Operating temperature range I: Industry Standard Package Type J: TQFN H:WCSP Block Diagram Figure 2. DS2012 Ver 0.2 Nov. 2007 3 联系电话：１５９９９６４４５７９ ８３１５１７１５ 芯美电子 EUA2012 Absolute Maximum Ratings ▓ ▓ ▓ ▓ ▓ Supply Voltage, AVDD,PVDD Input Voltage, VI ---------------------------------------------------------------------------------- -0.3 V to 6V -0.3 V to VDD +0.3V Junction Temperature, TJ ------------------------------------------------------------------------------ -40°C to 150°C Storage Temperature Rang, Tstg --------------------------------------------------------------------- -65°C to 85°C ESD Susceptibility ▓ ▓ ------------------------------------------------------------------------- ------------------------------------------------------------------------------------------ 2kV Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds --------------------------------------- 260°C Thermal Resistance θJA (TQFN) ------------------------------------------------------------------------------------------------ 47°C/W Recommended Operating Conditions Min Max Unit Supply voltage, AVDD,PVDD 2.5 5.5 V High-level input voltage,SDL , SDR ,G0,G1 1.3 V Low-level input voltage, SDL , SDR ,G0,G1 Operating free-air temperature, TA -40 0.35 V 85 °C Electrical Characteristics TA = 25°C (Unless otherwise noted) Symbol Parameter Conditions VOO Output offset voltage (measured differentially) Inputs ac grounded, AV= 6dB, VDD=2.5V to 5.5V PSRR Power supply rejection ratio VDD= 2.5V to 5.5V Vicm Common-mode input voltage CMRR Common-mode rejection ration Min EUA2012 Max. Typ 5 25 mV -75 -55 dB VDD-0.8 V -50 dB 0.5 Input shorted together, VDD= 2.5V to 5.5V Unit -69 I IH High-level input current VDD= 5V, VI= VDD 50 µA I IL Low-level input current VDD= 5V, VI= 0V 5 µA IDD Supply current VDD= 5V, no load or output filter 9 12 VDD= 3.6V, no load or output filter 5 7.5 VDD= 2.5V, no load or output filter 4 6 Shutdown mode rDS(on) f(sw) Static drain-source on-state resistance Output impedance in SHUTDOWN mode Switching frequency VDD= 5V 400 VDD= 3.6V 450 VDD= 2.5V 550 V (SDR ,SDL ) =0.35V Closed-loop voltage gain 2 kΩ 250 300 350 G0,G1=0.35V 5.3 6 6.5 G0=VDD ,G1=0.35V 11.2 12 12.5 G0=0.35V,G1= VDD 17.2 18 18.5 23 24 24.5 4 联系电话：１５９９９６４４５７９ ８３１５１７１５ µA mΩ VDD= 2.5V to 5.5V G0,G1= VDD DS2012 Ver 0.2 Nov. 2007 1.5 mA kHz dB 芯美电子 EUA2012 Electrical Characteristics TA = 25°C, RL=8Ω (Unless otherwise noted) Symbol PO Parameter Output power (per channel) Conditions RL=8Ω RL=4Ω THD+N kSVR CMRR Min EUA2012 Typ Max. VDD= 5V,f=1kHz,THD=10% 1.6 VDD= 3.6V,f=1kHz,THD=10% 0.8 VDD= 5V, ,f=1kHz,THD=10% 2.7 Total harmonic distortion plus noise PO=1W,VDD= 5V,AV=6dB,f=1kHz 0.14 PO=0.5W,VDD= 5V,AV=6dB,f=1kHz 0.16 Channel crosstalk f=1kHz -82 Supply ripple rejection ratio VDD= 5V,AV=6dB,f=217 Hz -74 VDD= 3.6V,AV=6dB,f=217 Hz -72 VDD= 3.6V,VIC=1VPP,f=217 Hz -65 AV=6dB 30.8 AV=12dB 18.6 AV=18dB 12.4 AV=24dB 6.3 Start-up time from shutdown VDD= 3.6V 10 Output voltage noise VDD= 3.6V,f=20 to 20kHz,Inputs are ac grounded, AV=6dB Common mode rejection ratio Input impedance DS2012 Ver 0.2 Nov. 2007 No weighting 56 A weighting 39 5 联系电话：１５９９９６４４５７９ ８３１５１７１５ Unit W W % dB dB dB kΩ ms µV 芯美电子 EUA2012 Typical Operating Characteristics Figure3. DS2012 Ver 0.2 Nov. 2007 Figure4. Figure5. Figure6. Figure7. Figure8. 6 联系电话：１５９９９６４４５７９ ８３１５１７１５ 芯美电子 DS2012 Ver 0.2 Nov. 2007 EUA2012 Figure9. Figure10. Figure11. Figure12. Figure13. Figure14. 7 联系电话：１５９９９６４４５７９ ８３１５１７１５ 芯美电子 DS2012 Ver 0.2 Nov. 2007 EUA2012 Figure15. Figure16. Figure17. Figure18. Figure19. Figure20. 8 联系电话：１５９９９６４４５７９ ８３１５１７１５ 芯美电子 EUA2012 Figure22. Figure21. Figure24. Figure23. Figure25. DS2012 Ver 0.2 Nov. 2007 Figure26. 9 联系电话：１５９９９６４４５７９ ８３１５１７１５ 芯美电子 EUA2012 Figure27. DS2012 Ver 0.2 Nov. 2007 10 联系电话：１５９９９６４４５７９ ８３１５１７１５ 芯美电子 EUA2012 Application Information Decoupling Capacitor (CS) The EUA2012 is a high-performance class-D audio amplifier that requires adequate power supply decoupling to ensure the efficiency is high and total harmonic distortion (THD) is low. For higher frequency transients, spikes, or digital hash on the line a good low equivalent-series-resistance (ESR) ceramic capacitor, typically 1µF, placed as close as possible to the device PVDD lead works best. Placing this decoupling capacitor close to the EUA2012 is important for the efficiency of the class-D amplifier, because any resistance or inductance in the trace between the device and the capacitor can cause a loss in efficiency. For filtering lower-frequency noise signals, a 4.7µF or greater capacitor placed near the audio power amplifier would also help, but it is not required in most applications because of the high PSRR of this device. G1 G0 0 0 1 1 0 1 0 1 Table 1. Gain Setting GAIN GAIN Input Impedance (V/V) (dB) (RI)(KΩ) 2 6 30.8 4 12 18.6 8 18 12.4 16 24 6.3 Input Capacitors (CI) The EUA2012 does not require input coupling capacitors if the design uses a differential source that is biased from 0.5 V to VDD – 0.8 V. If the input signal is not biased within the recommended common −mode input range, if high pass filter (shown in Figure 28), or if using a single-ended source (shown in Figure 29), input coupling capacitors are required. The input capacitors and input resistors form a high-pass filter with the corner frequency, fc, determined in equation (1). 1 f = c 2 πR I C I ( ) If the corner frequency is within the audio band, the capacitors should have a tolerance of ± 10% or better, because any mismatch in capacitance causes an impedance mismatch at the corner frequency and below. Component Location Place all the external components very close to the EUA2012. Placing the decoupling capacitor, CS, close to the EUA2012 is important for the efficiency of the Class-D amplifier. Any resistance or inductance in the trace between the device and the capacitor can cause a loss in efficiency. Filter Free Operation and Ferrite Bead Filters A ferrite bead filter can often be used if the design is failing radiated emissions without an LC filter and the frequency sensitive circuit is greater than 1 MHz. This filter functions well for circuits that just have to pass FCC and CE because FCC and CE only test radiated emissions greater than 30 MHz. When choosing a ferrite bead, choose one with high impedance at high frequencies, and very low impedance at low frequencies. In addition, select a ferrite bead with adequate current rating to prevent distortion of the output signal. Use an LC output filter if there are low frequency (< 1 MHz) EMI sensitive circuits and/or there are long leads from amplifier to speaker. Figure 30 shows typical ferrite bead and LC output filters. Figure30. Typical Ferrite Chip Bead Filter --------------------------------------------(1) The value of the input capacitor is important to consider as it directly affects the bass (low frequency) performance of the circuit. Speakers in wireless phones cannot usually respond well to low frequencies, so the corner frequency can be set to block low frequencies in this application. Not using input capacitors can increase output offset. Equation (2) is used to solve for the input coupling capacitance. 1 C = I 2 πR I f c ( ) --------------------------------------------(2) DS2012 Ver 0.2 Nov. 2007 11 联系电话：１５９９９６４４５７９ ８３１５１７１５ 芯美电子 EUA2012 Figure28. Application Schematic With Differential Input and Input Capacitors Figure29. Application Schematic With Single-Ended Input DS2012 Ver 0.2 Nov. 2007 12 联系电话：１５９９９６４４５７９ ８３１５１７１５ 芯美电子 EUA2012 Packaging Information TQFN-20 SYMBOLS A b E D D1 E1 e L DS2012 Ver 0.2 Nov. 2007 MILLIMETERS MIN. MAX. 0.70 0.80 0.18 0.30 3.90 4.10 3.90 4.10 2.50 2.50 0.50 0.30 0.50 INCHES MIN. 0.028 0.007 0.154 0.154 MAX. 0.031 0.012 0.161 0.161 0.098 0.098 0.020 0.012 0.020 13 联系电话：１５９９９６４４５７９ ８３１５１７１５ 芯美电子 EUA2012 WCSP-16 A B D C 4 3 D 2 D1 1 E A A1 E1 SYMBOLS A A1 D D1 E E1 DS2012 Ver 0.2 Nov. 2007 MILLIMETERS MIN. MAX. 0.675 0.15 0.35 2.01 2.11 0.50 2.01 2.11 0.50 INCHES MIN. 0.006 0.079 MAX. 0.027 0.014 0.083 0.020 0.079 0.083 0.020 14 联系电话：１５９９９６４４５７９ ８３１５１７１５