芯美电子 EUA2014 2.5W Stereo Class-D Audio Power Amplifier with 3D Enhancement DESCRIPTION FEATURES The EUA2014 is a high efficiency, 2.5W/channel stereo class-D audio power amplifier. A low noise, filterless PWM architecture eliminates the output filter. Operating from a single 5V supply, EUA2014 is capable of delivering 2.5W/ channel of continuous output power to a 4Ω load with 10% THD+N. The EUA2014 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 EUA2014 also includes 3D audio enhancement that improves stereo sound quality. In devices where the left and right speakers are in close proximity, 3D enhancement affects channel specialization, widening the perceived soundstage. The EUA2014 is available in space-saving TQFN package, is an idea choice for mobile phones and other portable communication devices. z z z z z z z z z z z z z Unique Modulation Scheme Reduces EMI Emission Output Power By TQFN Package - 2.5W/Ch Into 4Ω at 5V - 1.5W/Ch Into 8Ω at 5V - 750mW/Ch Into 8Ω at 3.6V 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 :70dB at 217Hz Fast 10ms Startup Time Low 4.7mA Quiescent Current at 3.6V Supply and 1.5µA Shutdown Current Short-Circuit and Thermal Protection 3D Enhancement Space Saving Packages - 4mm × 4mm TQFN-24 package RoHS Compliant and 100% Lead(Pb)-Free APPLICATIONS z z z Typical Application Circuit Wireless or Cellular Handsets and PDAs Portable Audios Notebook PC Figure1. DS2014 Ver 0.1 Feb. 2008 1 联系电话：１５９９９６４４５７９ ８３１５１７１５ 芯美电子 EUA2014 Pin Configurations Package Type Pin Configurations TQFN-24 Pin Description PIN NAME 1 3DR+ DESCRIPTION Right Channel non-inverting 3D connection. Connect to 3DL+ through C3D+ and R3D+ 2 INR+ Right Channel Non-Inverting Input 3 INR- Right Channel Inverting Input 4 3DEN 3D Enable Input 5 INL- Left Channel Inverting Input 6 INL+ Left Channel Non-Inverting Input 7 3DL+ Left Channel non-inverting 3D connection. Connect to 3DR+ through C3D+ and R3D+ 8 3DL- Left Channel non-inverting 3D connection. Connect to 3DR+ through C3D- and R3D- 9 G1 10,21 PVDD 11 OUTLA Left Channel Inverting Output 12 OUTLB Left Channel Non-Inverting Output 13,18 PGND 14 SDL 15 SS/ FF 16 SDR 17 GND 19 OUTRB Right Channel Non-Inverting Output 20 OUTRA Right Channel Inverting Output 22 VDD Power Supply 23 G0 Gain Select Input 0 24 3DR- DS2014 Ver 0.1 Feb. 2008 Gain Select Input 1 Speaker Power Supply Power Ground Left Channel Active Low Shutdown. Connect to VDD for normal operation. Connect to GND to disable the left channel. Modulation Mode Select. Connect to VDD for spread spectrum mode. Connect to GND for fixed frequency mode. SDR Right Channel Active Low Shutdown. Connect to VDD for normal operation. Connect to GND to disable the right channel. Ground Right Channel muting 3D connection. Connect to 3DL- through C3D-and R3D- 2 联系电话：１５９９９６４４５７９ ８３１５１７１５ 芯美电子 EUA2014 Ordering Information Order Number Package Type Marking Operating Temperature range EUA2014JIR1 TQFN-24 xxxxx A2014 -40 °C to 85°C EUA2014 □ □ □ □ Lead Free Code 1: Lead Free 0: Lead Packing R: Tape & Reel Operating temperature range I: Industry Standard Package Type J: TQFN DS2014 Ver 0.1 Feb. 2008 3 联系电话：１５９９９６４４５７９ ８３１５１７１５ 芯美电子 EUA2014 Absolute Maximum Ratings ▓ ▓ ▓ ▓ ▓ ▓ ▓ Supply Voltage ---------------------------------------------------------------------------------------------6V Input Voltage ------------------------------------------------------------------------------------ -0.3 V to VDD +0.3V Junction Temperature, TJ -----------------------------------------------------------------------------------150°C Storage Temperature Rang, Tstg -------------------------------------------------------------------- -65°C to 150°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, VDD,PVDD 2.5 5.5 V High-level input voltage, SDL , SDR ,G0,G1, SS/ FF ,3DEN 1.3 V Low-level input voltage, SDL , SDR ,G0,G1, SS/ FF ,3DEN Operating free-air temperature, TA -40 0.2 V 85 °C Electrical Characteristics VDD=PVDD=3.6V The following specifications apply for AV = 6dB, RL = 15µH + 8Ω + 15µH, SS/ FF = VDD = (Spread Spectrum mode), f = 1kHz, unless otherwise specified. Limits apply for TA = 25°C. Symbol Parameter Conditions VOS Differential Output Offset Voltage VIN=0, VDD=2.5V to 5.5V IDD Quiescent Power Supply Current (Both channels active) ISD Min EUA2014 Typ Max. 5 25 VDD= 3.6V, no load or output filter 4.7 6.5 VDD= 5V, no load or output filter 7.3 9.5 Shutdown Current VSDL=VSDR=GND 0.8 1.5 TWU Wake Up Time VDD= 3.6V 10 fSW Switching Frequency SS/ FF =VDD (Spread Spectrum) 300 SS/ FF =GND (Fixed Frequency) 300 AV RIN DS2014 Gain Input Resistance Ver 0.1 Feb. 2008 330 6 6.5 G0=VDD ,G1=GND 11.5 12 12.5 G0=GND, G1= VDD 17.5 18 18.5 G0,G1= VDD 23.5 24 24.5 AV=12dB 80 AV=18dB 40 AV=24dB 20 4 联系电话：１５９９９６４４５７９ ８３１５１７１５ mA µA kHz kHz 5.5 160 mV ms G0,G1=GND AV=6dB Unit dB kΩ 芯美电子 EUA2014 Electrical Characteristics VDD=PVDD=3.6V The following specifications apply for AV = 6dB, RL = 15µH + 8Ω + 15µH, SS/ FF = VDD = (Spread Spectrum mode), f = 1kHz, unless otherwise specified. Limits apply for TA = 25°C. Symbol Parameter Conditions Min EUA2014 Typ Max. Unit RL=15uH + 4Ω + 15uH, THD ≤ 10% f=1kHz, 22kHz BW VDD=5V VDD=3.6V VDD=2.5V 2.5 1.2 0.5 W W W RL=15uH + 8Ω + 15uH, THD ≤ 10% f=1kHz, 22kHz BW PO Output Power (Per Channel) VDD=5V VDD=3.6V VDD=2.5V 1.5 0.75 0.35 W W W RL=15uH + 4Ω + 15uH, THD ≤ 1% f=1kHz, 22kHz BW VDD=5V VDD=3.6V VDD=2.5V 1.85 1 0.45 W W W RL=15uH + 8Ω + 15uH, THD ≤ 1% f=1kHz, 22kHz BW THD+N Total Harmonic Distortion PSRR Power Supply Rejection Ratio CMRR Common Mode Rejection Ration η Efficiency Xtalk Crosstalk SNR Signal to Noise Ratio ε OS DS2014 Output Noise Ver 0.1 Feb. 2008 VDD=5V VDD=3.6V VDD=2.5V Po=500mW/Ch, f=1kHz, RL=8Ω Po=300mW/Ch, f=1kHz, RL=8Ω 1.2 0.6 0.27 0.2 0.22 W W W % % VRIPPLE=200mVp-p Sine, Inputs AC GND, CIN=1uF, input referred fRipple=217Hz 70 dB fRipple=1kHz 68 dB VRIPPLE=1Vp-p, fRIPPLE=217Hz Po=1W/Ch, f=1kHz, RL=8Ω, VDD=5V Po=500mW/Ch, f=1kHz VDD=5V, Po=1W, Fixed Frequency Mode 60 dB 86 % 82 dB 88 dB Input referred, Fixed Frequency Mode No Weighted Filter 66 µV A-Weighted Filter 48 µV 5 联系电话：１５９９９６４４５７９ ８３１５１７１５ 芯美电子 EUA2014 Typical Operating Characteristics Figure2. DS2014 Ver 0.1 Feb. 2008 Figure3. Figure4. Figure5. Figure6. Figure7. 6 联系电话：１５９９９６４４５７９ ８３１５１７１５ 芯美电子 DS2014 Ver 0.1 Feb. 2008 EUA2014 Figure8. Figure9. Figure10. Figure11. Figure12. Figure13. 7 联系电话：１５９９９６４４５７９ ８３１５１７１５ 芯美电子 DS2014 Ver 0.1 Feb. 2008 EUA2014 Figure14. Figure15. Figure16. Figure17. Figure18. Figure19. 8 联系电话：１５９９９６４４５７９ ８３１５１７１５ 芯美电子 EUA2014 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 Application Information Decoupling Capacitor (CS) The EUA2014 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 EUA2014 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 Place all the external components very close to the EUA2014. Placing the decoupling capacitor, CS, close to the EUA2014 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 20 shows typical ferrite bead and LC output filters. Table 1. Gain Setting GAIN GAIN Input Impedance (V/V) (dB) (RIN)(KΩ) 2 6 160 4 12 80 8 18 40 16 24 20 Input Capacitors (CI) The EUA2014 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 1), 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 ( Figure20. 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 ( DS2014 ) --------------------------------------------(2) Ver 0.1 Feb. 2008 9 联系电话：１５９９９６４４５７９ ８３１５１７１５ 芯美电子 EUA2014 3D Enhancement The EUA2014 features 3D enhancement effect that widens the perceived soundstage of a stereo audio signal. The 3D enhancement increases the apparent stereo channel separation, improving audio reproduction whenever the left and right speakers are too close to one another. An external RC network shown in Figure 1 is required to enable the 3D effect. Because the EUA2014 is a fully differential amplifier, there are two separate RC networks, one for each stereo input pair (INL+ and INR+, and INLand INR-). Set 3DEN high to enable the 3D effect. Set 3DEN low to disable the 3D effect. The 3D RC network acts as a high pass filter. The amount of the 3D effect is set by the R3D resistor. Decreasing the value of R3D increases the 3D effect. The C3D capacitor sets the frequency at which the 3D effect occurs. Increasing the value of C3D decreases the low frequency cutoff point, extending the 3D effect over a wider bandwidth. The low frequency cutoff point is given by: f 3 D ( −3 dB ) = 1 / 2 π(R 3 D )(C 3 D ) Enabling the 3D effect increase the gain by a factor of (1 +20kΩ/R3D). Setting R3D to 20kΩ results in a gain increase of 6dB whenever the 3D effect is enabled. In fully differential configuration, the component values of the two RC networks must be identical. Any component variations can affect the sound quality of the 3D effect. In single-ended configuration, only the RC network of the input pairs being driven by the audio source needs to be connected. For instance, if audio is applied to INR+ and INL+, then a 3D network must be connected between 3DL+ and 3DR+. 3DL- and 3DR- can be left unconnected. DS2014 Ver 0.1 Feb. 2008 10 联系电话：１５９９９６４４５７９ ８３１５１７１５ 芯美电子 EUA2014 Packaging Information TQFN-24 SYMBOLS A A1 b E D D1 E1 e L DS2014 Ver 0.1 Feb. 2008 MILLIMETERS MIN. MAX. 0.70 0.80 0.00 0.05 0.18 0.30 3.90 4.10 3.90 4.10 2.70 2.70 0.50 0.30 0.50 INCHES MIN. 0.028 0.000 0.007 0.154 0.154 MAX. 0.031 0.002 0.012 0.161 0.161 0.106 0.106 0.020 0.012 0.020 11 联系电话：１５９９９６４４５７９ ８３１５１７１５