EUA6204A 3W Mono Fully Differential Audio Power Amplifier DESCRIPTION FEATURES z z The EUA6204A is a mono fully-differential audio amplifier, capable of delivering 3W of continuous average power to an 3Ω BTL load with less than 10% distortion (THD+N) from a 5V power supply, and 720mW to a 8Ω load from a 3.6V power supply. The EUA6204A is ideal for PDA/notebook and portable devices application due to features such as -80-dB supply voltage rejection from 20Ha to 2kHz, improved RF rectification immunity, and a fast startup with minimal pop. The EUA6204A is available in a SOP-8(FD). z z z z z Supply Voltage 2.5V to 5.5V 2.3W into 3Ω from a 5-V Supply at THD=1% (typ) 3W into 3Ω at THD=10% Low Supply Current: 4mA typ at 5V Shutdown Current: 0.01µA typ Fast Startup with Minimal Pop Only Three External Components - Improved PSRR (-80dB) for Direct Battery Operation - Full Differential Design Reduces RF Rectification - -63dB CMRR Eliminates Two Input Coupling Capacitors RoHS Compliant and 100% Lead (Pb)-Free APPLICATIONS z PDAs z Portable Devices z Notebook Typical Application Circuit DS6204A Ver 1.2 Jan. 2007 1 EUA6204A Block Diagram Pin Configurations Package Pin Configurations Plastic SOP-8(FD)＊ ＊Thermal Pad Pin Description SYMBOL PIN Shutdown Bypass 1 Shutdown terminal 2 Mid-supply voltage, adding a bypass capacitor improves PSRR IN+ 3 Positive differential input IN- 4 Negative differential input VO+ 5 Positive BTL output VDD 6 Power supply GND 7 High-current ground VO- 8 Negative BTL output DS6204A Ver 1.2 Jan. 2007 DESCRIPTION 2 EUA6204A Ordering Information Order Number Package Type EUA6204ADIR1 SOP-8 Marking xxxx EUA6204 A EUA6204A □ □ □ □ Lead Free Code 1: Lead Free 0: Lead Packing R: Tape & Reel Operating temperature range I: Industry Standard Package Type D: SOP DS6204A Ver 1.2 Jan. 2007 3 Operating Temperature range -40°C to 85°C EUA6204A Absolute Maximum Ratings ▓ ▓ ▓ ▓ ▓ ▓ Supply voltage, VDD -------------------------------------------------------------------------------------------- 6V Input voltage, VI ---------------------------------------------------------------------------- -0.3 V to VDD +0.3V Storage temperature rang, Tstg ------------------------------------------------------------------- -65°C to 150°C ESD Susceptibility -------------------------------------------------------------------------------------------- 2kV Junction Temperature ---------------------------------------------------------------------------------------- 150°C Thermal Resistance θJA (SOP-8) ------------------------------------------------------------------------------------------------- 42.3°C/W Recommended Operating Conditions MIN NOM MAX UNIT 2.5 5.5 V 1.55 V 0.5 -40 85 °C Supply Voltage, VDD High-level input voltage, VIH Low-level input voltage, VIL Operating free-air temperature, TA Electrical Characteristics, TA=25°C Symbol VOS Parameter Output offset voltage (measured differentially) PSRR Power supply rejection ratio VIC CMRR IQ I(SD) -9 VDD=2.5V to 5.5V 2 9 mV -85 -60 dB VDD-0.8 V VDD=2.5V to 5.5V Common mode rejection range VDD=2.5V, VIC=0.5V to 1.7V -63 -40 VDD=5.5V, VIC=0.5V to 4.7V -63 -40 High-output swing |IIL| VI=0V differential, Gain=1V/V, VDD=5.5V Common mode input range Low-output swing |IIH| EUA6204A Unit Min Typ Max. Conditions High-level input current, Shutdown Low-level input current, Shutdown Quiescent current Supply current RL=8Ω, VIN+=VDD, VIN+=0V, Gain=1V/V VIN-=0V or VIN-=VDD RL=8Ω, Gain=1V/V VIN+=VDD, VIN-=0V or VIN-=VDD, VIN+=0V VDD=5.5V VDD=3.6V VDD=2.5V VDD=5.5V VDD=3.6V VDD=2.5V 2 0.45 0.37 0.26 4.95 3.18 2.13 dB V 0.4 V VDD=5.5V, VI=5.8V 58 100 µA VDD=5.5V, VI=-0.3V 3 100 µA VDD=2.5V to 5.5V, no load 4 8 mA V( Shutdown )≤0.5V, VDD=2.5V to 5.5V, RL= 8Ω 0.01 1 µA 40kΩ RI 42kΩ RI V/V Gain RL= 8Ω Resistance from shutdown to GND DS6204A Ver 1.2 Jan. 2007 0.5 38kΩ RI 100 4 kΩ EUA6204A Operating Characteristics, TA=25°C, Gain=1V/V Symbol PO THD+N Parameter Output power Total harmonic distortion plus noise KSVR Supply ratio SNR Signal-to-noise ratio Vn Output voltage noise CMRR RF Conditions ripple rejection Common mode rejection ratio RL=3Ω THD+N=1%, f=1kHz,VDD=5V RL=4Ω RL=8Ω RL=3Ω THD+N=10%,f=1kHz,VDD=5V RL=4Ω RL=8Ω VDD=5V, PO=1W, RL=8Ω, f=1kHz 2.3 2.1 1.36 3 2.6 1.7 0.15 VDD=3.6V, PO=0.5W, RL=8Ω, f=1kHz 0.1 VDD=2.5V, PO=200mW, RL=8Ω, f=1kHz VDD=3.6V, f = 217Hz Inputs ac-grounded f=20Hz with Ci=2µF, to 20kHz V(Ripple)=200mVpp VDD=5V, PO=1W, RL=8Ω No VDD=3.6V, f=20Hz to 20kHz, weighting Inputs ac-grounded with A Ci=2µF weighting VDD=3.6V f=217Hz VIC=1Vpp 0.1 Feedback resistance Start-up shutdown time EUA6204A Unit Min Typ Max. VDD=3.6V, CBYPASS=0.1µF W % -77 dB -60 100 dB 25 µVRMS 19 -64 38 from W 40 dB 44 27 Note: 1.When driving 3Ω or 4Ω load from a 5V supply, the EUA6204A must be mounted to a circuit board with thermal pad. DS6204A Ver 1.2 Jan. 2007 5 kΩ ms EUA6204A Typical Operating Characteristics DS6204A Ver 1.2 Jan. 2007 6 EUA6204A DS6204A Ver 1.2 Jan. 2007 7 EUA6204A DS6204A Ver 1.2 Jan. 2007 8 EUA6204A Application Information Application Schematics Figure17 through Figure18 show application schematics for differential and single-ended inputs. Typical values are shown in Table1. Table1. Typical Component Value Component RI C(BYPASS) CS CI Value 40kΩ 0.22µF 1µF 0.22µF Power Dissipation Power dissipation is a major concern when designing a successful amplifier, whether the amplifier is bridged or single-ended. A direct consequence of the increased power delivered to the load by a bridge amplifier is an increase in internal power dissipation. Since the EUA6204A has two operational amplifiers in one package, the maximum internal power dissipation is 4 times that of a single-ended amplifier. The maximum power dissipation for a given application can be derived from the power dissipation graphs of from equation1. P DMAX = 4 * (VDD ) 2 /(2π 2 R L ) ------------(1) It is critical that the maximum junction temperature TJMAX of 150°C is not exceeded. TJMAX can be determine from the power derating curves by using PDMAX and the PC board foil area. By adding additional copper foil, the thermal resistance of the application can be reduced, resulting in higher PDMAX. Additional copper foil can be added to any of the leads connected to the EUA6204A. If TJMAX still exceeds 150°C, then additional changes must be made. These changes can include reduced supply voltage, higher load impedance, or reduced ambient temperature. Internal power dissipation is a function of output power. Proper Selection of External Components Gain-Setting Resistor Selection The input resistor (RI) can be selected to set the gain of the amplifier according to equation2. Gain=RF/RI (2) The internal feedback resistors (RF) are trimmed to 40kΩ. Resistor matching is very important in fully differential amplifiers. The balance of the output on the reference voltage depends on matched ratios of the resistors. CMRR, PSRR, and the cancellation of the second harmonic distortion diminishes if resistor mismatch occurs. Therefore, it is recommended to use 1% tolerance resistors or better to keep the performance optimized. Bypass Capacitor (CBYPASS) and Start-up Time The internal voltage divider at the Bypass pin of this device sets a mid-supply voltage for internal references and sets the output common mode voltage to VDD/2. Adding a capacitor to this pin filters any noise into this pin and increases kSVR. C(BYPASS) also determines the rise time of VO+ and VO- when the device is taken out of shutdown. The larger the capacitor, the slower the rise time. Show the relationship of C(BYPASS) to start-up time as Figure13. DS6204A Ver 1.2 Jan. 2007 9 EUA6204A Input Capacitor (CI) The EUA6204A does not require input coupling capacitors if using a differential input source that is biased from 0.5V to VDD -0.8V. Use 1% tolerance or better gain-setting resistors if not using input coupling capacitors. In the single-ended input application an input capacitor, CI, is required to allow the amplifier to bias the input signal to the proper dc level. In this case, CI and RI form a high-pass filter with the corner frequency determined in equation3. 1 f = (3) C 2π R C I I The value of CI is important to consider as it directly affects the bass (low frequency) performance of the circuit. Consider the example where RI is 10kΩ and the specification calls for a flat bass response down to 100Hz. Equation 3 is reconfigured as equation4. 1 C = (4) I 2π R f I C In this example, CI is 0.16µF, so one would likely choose a value in the range of 0.22µF to 0.47µF. Ceramic capacitors should be used when possible, as they are the best choice in preventing leakage current. When polarized capacitors are used, the positive side of the capacitor should face the amplifier input in most applications, as the dc level there is held at VDD/2, which is likely higher than the source dc level. It is important to confirm the capacitor polarity in the application. DS6204A Ver 1.2 Jan. 2007 10 Decoupling Capacitor (CS) The EUA6204A is a high-performance CMOS audio amplifier that requires adequate power supply decoupling to ensure the output total harmonic distortion (THD) is as low as possible. Power supply decoupling also prevents oscillations for long lead lengths between the amplifier and the speaker. For higher frequency transients, spikes, or digital hash on the line, a good low equivalent-series-resistance (ESR) ceramic capacitor, typically 0.1µF to 1 µF, placed as close as possible to the device VDD lead works best. For filtering lower frequency noise signals, a 10-µF or greater capacitor placed near the audio power amplifier also helps, but is not required in most applications because of the high PSRR of this device. EUA6204A Package Information SOP-8 (FD) SYMBOLS A A1 D E1 E L b e D1 E2 DS6204A Ver 1.2 Jan. 2007 MILLIMETERS MIN. MAX. 1.35 1.75 0.05 0.25 4.90 3.90 5.80 6.20 0.40 1.27 0.33 0.51 1.27 2.06 2.06 11 INCHES MIN. 0.053 0.002 0.193 0.153 0.228 0.016 0.013 0.500 0.081 0.081 MAX. 0.069 0.010 0.244 0.050 0.020