北京东微世纪科技有限公司 Eastmicro Technology URL:http://www.eastmicrotech.com Te l :86-10-82896580 Fax:86-10-82896195 2.7 W/CH STEREO FILTER-FREE CLASS-D AUDIO POWER AMPLIFIER EMT8026 DESCRIPTION The EMT8026 is a stereo, filter-free, Class-D audio amplifier (class-D amp) designed for cell phone and portable equipments. It is available in QFN package. The EMT8026 features independent shutdown controls for each channel. The gain can be selected utilizing the external resistor. In addition to these features, Unique Pop-click noise depression circuit and enhanced ESD design make the EMT8026 class-D amp an ideal choice for both cellular handsets and PDAs. The EMT8026 is capable of driving 1.65 W/Ch at 5 V or 840 mW/Ch at 3.6 V into 8 Ω load. The EMT8026 is also capable of driving 4 Ω. The EMT8026 provides thermal and short circuit protection for higher reliability. FEATURES • Output Power By Package: QFN: • • • • • • • • • – 2.7 W/Ch Into 4 Ω at 5 V – 1.65 W/Ch Into 8 Ω at 5 V – 840 mW/Ch Into 8 Ω at 3.6 V Only Two External Components Required Power Supply Range: 2.7 V to 5.5 V Independent Shutdown Control for Each Channel Internal Pulldown Resistor On Shutdown Pins High PSRR: 77 dB at 217 Hz Low Supply Current Low Shutdown Current Short-Circuit and Thermal Protection Space Saving Packages – 4 mm X 4 mm Thin QFN APPLICATIONS • • • • • • Wireless or Cellular Handsets and PDAs Portable DVD Player Notebook PC Portable Radio and Gaming Educational Toys USB Speaker EMT8026 - 1 - May,2009 北京东微世纪科技有限公司 URL:http://www.eastmicrotech.com Eastmicro Technology Te l :86-10-82896580 Fax:86-10-82896195 2.7 W/CH STEREO FILTER-FREE CLASS-D AUDIO POWER AMPLIFIER EMT8026 TYPICAL APPLICATION * For QFN, an additional capacitor is recomended for the second PVDD pin Fig. 1 Typical Application Circuit PIN CONFIGURATION Fig. 2 EMT8026 - 2 - Top View May,2009 北京东微世纪科技有限公司 URL:http://www.eastmicrotech.com Eastmicro Technology Te l :86-10-82896580 Fax:86-10-82896195 2.7 W/CH STEREO FILTER-FREE CLASS-D AUDIO POWER AMPLIFIER EMT8026 PIN CONNECTION Table 1 Pin Connection PIN QFN INR+ 16 I Right Channel positive input INR- 17 I Right Channel negative input INL+ 20 I Left Channel positive input INL- 19 I Left Channel negative input OUTR+ 14 O Right channel +output OUTR- 11 O Right channel –output OUTL+ 2 O Left channel +output OUTL- 5 O Left channel –output PVDD 3,13 I Power supply Voltage (Must be same voltage as AVDD) AVDD 9 I Analog supply Voltage (Must be same voltage as PVDD) SDR 8 I Right channel shutdown terminal SDL 7 I Left channel shutdown terminal G0 15 I Gain select G1 1 I Gain select PGND 4,12 I Power ground AGND 18 I Analog ground NC I/O 6,10 Description No interal connection ABSOLUTE MAXIMUM RATINGS Table 2 Absolute Maximum Ratings VSS Supply voltage, AVDD, In active mode PVDD In shutdown mode VI Input voltage Continuous total power dissipation VALUE UNIT -0.3 to 6.0 V -0.3 to 7.0 V -0.3 to VDD+ 0.3 V See Dissipation Rating Table TA Operating free-air temperature range -40 to 85 °C TJ Operating junction temperature range -40 to 150 °C Tstg Storage temperature range -65 to 150 °C RECOMMENDED OPERATING CONDITIONS Table 3 Recommended Operating Conditions MIN MAX 5.5 VSS Supply voltage AVDD, PVDD 2.7 VIH High-level input voltage SDL, SDR, G0, G1 1.3 VIL Low-level input voltage SDL, SDR, G0, G1 TA Operating free-air temperature EMT8026 -40 - 3 - UNIT V V 0.35 V 85 °C May,2009 北京东微世纪科技有限公司 URL:http://www.eastmicrotech.com Eastmicro Technology Te l :86-10-82896580 Fax:86-10-82896195 2.7 W/CH STEREO FILTER-FREE CLASS-D AUDIO POWER AMPLIFIER EMT8026 ELECTRICAL CHARACTERISTICS Table 4(1) Electrical Characteristics PARAMETER TEST CONDITIONS MIN |VOO| Output offset voltage (measured differentially) Inputs ac grounded, AV= 6 dB, VDD= 2.7 to 5.5 V PSRR VDD= 2.7 to 5.5 V Power supply rejection ratio Vicm Common-mode input voltage TYP MAX 5 25 mV -75 -55 dB 0.5 V -50 dB μA μA Inputs shorted together, VDD= 2.5 to 5.5 V |IIH| High-level input current VDD= 5.5 V, VI= VDD 50 |IIL| Low-level input current VDD= 5.5 V, VI= 0 V 5 5 IDD VDD= 5.5 V, No load or output filter VDD= 3.6 V, No load or output filter 3.6 7.5 VDD= 2.5 V, No load or output filter 3 6 Shutdown mode <0.1 1.5 VDD= 5.5 V 400 VDD= 3.6 V 450 VDD= 2.7 V 480 rDS(on) Static drain-source on-state resistance Output impedance in shutdown mode V(SDR, SDL)= 0.35 V f(sw) VDD= 2.7 V to 5.5 V PO Switching frequency Output power (per channel) RL= 8 Ω RL= 4 Ω THD+N Total harmonic distortion plus noise Channel crosstalk EMT8026 PO=1W, f =1kHz -60 VDD–0.8 CMRR Common-mode rejection ration Supply current 9 mA μA mΩ 2 250 300 VDD=5.0V,f=1kHz, THD=10% 1.65 VDD=3.6V, f=1kHz, THD = 10% 0.84 VDD=5.0V, f=1kHz, THD=10% 2.7 VDD=5V, UNIT 350 kHz W 0.3 % PO=0.5W,VDD=5V,AV=6dB, f =1kHz 0.2 % f= 1 kHz –95 - 4 - AV=6dB, kΩ dB May,2009 北京东微世纪科技有限公司 URL:http://www.eastmicrotech.com Eastmicro Technology Te l :86-10-82896580 Fax:86-10-82896195 2.7 W/CH STEREO FILTER-FREE CLASS-D AUDIO POWER AMPLIFIER Table 4(2) EMT8026 Electrical Characteristics (Continue) PARAMETER TEST CONDITIONS kSVR Supply ripple rejection ratio VDD=5V,AV=6dB, f = 217 Hz CMRR Common mode rejection ratio MIN TYP MAX UNIT –77 dB VDD=3.6V,VIC=1Vpp , f = 217 Hz –60 dB Start-up time from shutdown VDD= 3.6 V 30 ms Vn VDD= 3.6 V, f = 20 to 20 kHz, Inputs are ac grounded, AV= 6 dB Output voltage noise VDD=3.6V,AV=6dB, f = 217 Hz –73 No weighting 80 A weighting 70 μV TYPICAL PERFORMANCE CHARACTERISTICS Fig.3 THD+N vs.Output Power f=1kHz, R=8ohm, VDD=5 EMT8026 - 5 - May,2009 北京东微世纪科技有限公司 Eastmicro Technology URL:http://www.eastmicrotech.com Te l :86-10-82896580 Fax:86-10-82896195 2.7 W/CH STEREO FILTER-FREE CLASS-D AUDIO POWER AMPLIFIER EMT8026 Fig.4 THD+N vs.Output Power f=1kHz, R=4ohm, VDD=5 Fig.5 THD+N vs.Frequency R=8ohm, VDD=5V, (1)VDD=3.6V EMT8026 - 6 - May,2009 北京东微世纪科技有限公司 Eastmicro Technology URL:http://www.eastmicrotech.com Te l :86-10-82896580 Fax:86-10-82896195 2.7 W/CH STEREO FILTER-FREE CLASS-D AUDIO POWER AMPLIFIER EMT8026 Fig.6 THD+N vs.Output Power f=1kHz, R=8ohm APPLICATION INFORMATION Application Circuit Fig.7 EMT8026 With Single-Ended Input - 7 - May,2009 北京东微世纪科技有限公司 URL:http://www.eastmicrotech.com Eastmicro Technology Te l :86-10-82896580 Fax:86-10-82896195 2.7 W/CH STEREO FILTER-FREE CLASS-D AUDIO POWER AMPLIFIER EMT8026 Decoupling Capacitor (CS) The EMT8026 is a high-performance Class-D audio amplifier that requires adequate power supply decouplingto 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 1 μ F, placed as close as possible to the device PVDDlead works best. Placing this decoupling capacitor close to the EMT8026 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 4.7 μ F 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. Input Capacitors (CI) The EMT8026 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 using a single-ended source (see Fig. 7), 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. 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. If the corner frequency is within the audio band, the capacitors should have a tolerance of ±10% or because any mismatch in capacitance causes an impedance mismatch at the corner frequency and below. Trace Width Recommended trace width at the solder balls is 75 μ m to 100 μ m to prevent solder wicking onto wider PCB traces. For high current pins (PVDD, PGND, and audio output pins) of the EMT8026, use 100- μ m trace widths at the solder balls and at least 500- μ m PCB traces to ensure proper performance and output power for the device. For the remaining signals of the EMT8026, use 75- μ m to 100- μ m trace widths at the solder balls. The audio input pins (INR+/- and INL+/-) EMT8026 - 8 - May,2009 北京东微世纪科技有限公司 URL:http://www.eastmicrotech.com Eastmicro Technology Te l :86-10-82896580 Fax:86-10-82896195 2.7 W/CH STEREO FILTER-FREE CLASS-D AUDIO POWER AMPLIFIER EMT8026 must run side-by-side to maximize common-mode noise cancellation. EFFICIENCY AND THERMAL INFORMATION Efficiency and Information The maximum ambient temperature depends on the heat-sinking ability of the PCB system. The derating factor for the packages are shown in the dissipation rating table. Converting this to θ JA for the QFN package: (3) Given θ JA of 24°C/W, the maximum allowable junction temperature of 150°C, and the maximum internal dissipation of 1.5W (0.75 W per channel) for 2.5 W per channel, 4-Ω load, 5-V supply, themaximum ambient temperature can be calculated with the following equation. (4) Equation 4 shows that the calculated maximum ambient temperature is 114°C at maximum power dissipation with a 5-V supply and 4-Ω a load. The EMT8026 is designed with thermal protection that turns the device off when the junction temperature surpasses 150°C to prevent damage to the IC. Also, using speakers more resistive than 4-Ω dramatically increases the thermal performance by reducing the output current and increasing the efficiency of the amplifier. Operation with DAC And Codes In using Class-D amplifiers with CODECs and DACs, sometimes there is an increase in the output noise floor from the audio amplifier. This occurs when mixing of the output frequencies of the CODEC/DAC mix with the switching frequencies of the audio amplifier input stage. The noise increase can be solved by placing a low-pass filter between the CODEC/DAC and audio amplifier. This filters off the high frequencies that cause the problem and allow proper performance. Filter free Operation Add 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 8 shows typical ferrite bead and LC output filters. EMT8026 - 9 - May,2009 北京东微世纪科技有限公司 Eastmicro Technology URL:http://www.eastmicrotech.com Te l :86-10-82896580 Fax:86-10-82896195 2.7 W/CH STEREO FILTER-FREE CLASS-D AUDIO POWER AMPLIFIER Fig.8 EMT8026 Typical Ferrite Chip Bead Filter PACKAGE INFORMATIO EMT8026 - 10 - May,2009 北京东微世纪科技有限公司 URL:http://www.eastmicrotech.com Eastmicro Technology Te l :86-10-82896580 Fax:86-10-82896195 2.7 W/CH STEREO FILTER-FREE CLASS-D AUDIO POWER AMPLIFIER Table 5 EMT8026 Package Information Eastmicro Technology Beijing Customer Support Center Fax：86-10-82896195 E-mail：[email protected] Tel：86-10-82896580 Address：612,Block D,No 2 Shangdi Info Road,Beijing,China EMT8026 Shanghai Customer Support Center Tel：86-21-54270077 Address：9/F.,No.1198, North Qin Zhou Road, Shanghai, China Shenzhen Customer Support Center Tel：86-755-33972018 Address：AAC Technologics Building, No.18 Xinxi Road, North Hi-Tech. Industrial Park, Nanshan District, Shenzhen, China - 11 - May,2009