TS4994EIJT

TS4994FC 1.2 W differential input/output audio power amplifier with selectable standby Features TS4994EIJT - Flip-chip (9 bumps) ■ Differential inputs ■ Near-zero pop & click ■ 100dB PSRR @ 217Hz with grounded inputs ■ Operating range from VCC = 2.5V to 5.5V ■ 1.2W rail-to-rail output power @ VCC = 5V, THD = 1%, F = 1kHz, with 8Ω load ■ 90dB CMRR @ 217Hz ■ Ultra-low consumption in standby mode (10nA) ■ Selectable standby mode (active low or active high) ■ Ultra fast startup time: 15ms typ. ■ Available in 9-bump flip-chip (300mm bump diameter) ■ Lead-free package Gnd VO- 7 6 5 VO+ Bypass 8 9 4 Stdby 1 2 3 VIN- VIN+ VCC Stdby Mode The device is equipped with common mode feedback circuitry allowing outputs to be always biased at VCC/2 regardless of the input common mode voltage. Description The TS4994 is an audio power amplifier capable of delivering 1W of continuous RMS output power into an 8Ω load @ 5V. Due to its differential inputs, it exhibits outstanding noise immunity. An external standby mode control reduces the supply current to less than 10nA. An STBY MODE pin allows the standby to be active HIGH or LOW. An internal thermal shutdown protection is also provided, making the device capable of sustaining short-circuits. The TS4994 is designed for high quality audio applications such as mobile phones and requires few external components. Applications ■ Mobile phones (cellular / cordless) ■ Laptop / notebook computers ■ PDAs ■ Portable audio devices Order codes Part number Temperature range Package Packaging -40°C, +85°C FC9 with back coating Tape & reel TS4994EIKJT TS4994EIJT December 2006 Lead free flip-chip9 Rev 2 Marking A94 A94 1/35 www.st.com 35 Contents TS4994FC Contents 1 Application component information . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 4 3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 4.1 Differential configuration principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 4.2 Gain in typical application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 4.3 Common mode feedback loop limitations . . . . . . . . . . . . . . . . . . . . . . . . . 23 4.4 Low and high frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 4.5 Calculating the influence of mismatching on PSRR performance . . . . . . 25 4.6 CMRR performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 4.7 Power dissipation and efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 4.8 Decoupling of the circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 4.9 Wake-up time: tWU 4.10 Shutdown time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 4.11 Pop performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 4.12 Single-ended input configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 5 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 6 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 2/35 TS4994FC Application component information Components Functional description Cs Supply bypass capacitor that provides power supply filtering. Cb Bypass capacitor that provides half supply filtering. Rfeed Feedback resistor that sets the closed loop gain in conjunction with Rin AV = closed loop gain = Rfeed/Rin. Rin Inverting input resistor that sets the closed loop gain in conjunction with Rfeed. Cin Optional input capacitor making a high pass filter together with Rin. (FCL = 1/(2πRinCin). Typical application VCC Rfeed1 20k 2 Cs 1u GND VCC + Diff. input - Cin1 220nF 20k Cin2 Rin2 + GND Rin1 220nF 20k Diff. Input + Optional + Figure 1. + 1 Application component information 3 Vin- - 1 Vin+ + Vo+ 5 Vo7 8 Ohms 8 Bypass Bias Cb 1u Standby Mode Stdby GND 4 6 GND 9 GND TS4994IJ Rfeed2 20k GNDVCC GNDVCC 3/35 Absolute maximum ratings and operating conditions TS4994FC 2 Absolute maximum ratings and operating conditions Table 1. Absolute maximum ratings Symbol VCC Vi Parameter Supply voltage (1) Input voltage (2) Value Unit 6 V GND to VCC V Toper Operating free air temperature range -40 to + 85 °C Tstg Storage temperature -65 to +150 °C 150 °C 250 °C/W internally limited W 2 kV Machine model 200 V Latch-up immunity 200 mA Lead temperature (soldering, 10sec) 260 °C Value Unit Tj Maximum junction temperature Rthja Thermal resistance junction to ambient Pdiss Power dissipation (3) Human body model ESD 1. All voltage values are measured with respect to the ground pin. 2. The magnitude of the input signal must never exceed VCC + 0.3V / GND - 0.3V. 3. The device is protected by a thermal shutdown active at 150°C. Table 2. Operating conditions Symbol Parameter VCC Supply voltage 2.5 to 5.5 V VSM Standby mode voltage input: Standby active LOW Standby active HIGH VSM=GND VSM=VCC V 1.5 ≤ VSTBY ≤ VCC GND ≤ VSTBY≤ 0.4 (1) V VSTBY Standby voltage input: Device ON (VSM = GND) or device OFF (VSM = VCC) Device OFF (VSM = GND) or device ON (VSM = VCC) TSD Thermal shutdown temperature 150 °C RL Load resistor ≥4 Ω Thermal resistance junction to ambient 100 °C/W Rthja 1. The minimum current consumption (ISTBY) is guaranteed when VSTBY = GND or VCC (i.e. supply rails) for the whole temperature range. 4/35 TS4994FC Electrical characteristics 3 Electrical characteristics Table 3. Electrical characteristics for VCC = +5V, GND = 0V, Tamb = 25°C (unless otherwise specified) Symbol ICC ISTBY Voo Parameter Min. Typ. Max. Unit Supply current No input signal, no load 4 7 mA Standby current No input signal, VSTBY = VSM = GND, RL = 8Ω No input signal, VSTBY = VSM = VCC, RL = 8Ω 10 1000 nA Differential output offset voltage No input signal, RL = 8Ω 0.1 10 mV VCC - 0.9 V VICM Input common mode voltage CMRR ≤ -60dB 0.6 Pout Output power THD = 1% Max, F= 1kHz, RL = 8Ω 0.8 1.2 W THD + N Total harmonic distortion + noise Pout = 850mW rms, AV = 1, 20Hz ≤ F ≤ 20kHz, RL = 8Ω 0.5 % PSRRIG Power supply rejection ratio with inputs grounded(1) F = 217Hz, R = 8Ω, AV = 1, Cin = 4.7μF, Cb =1μF Vripple = 200mVPP 100 dB CMRR Common mode rejection ratio F = 217Hz, RL = 8Ω, AV = 1, Cin = 4.7μF, Cb =1μF Vic = 200mVPP 90 dB SNR Signal-to-noise ratio (A-weighted filter, AV = 2.5) RL = 8Ω, THD +N < 0.7%, 20Hz ≤ F ≤ 20kHz 100 dB GBP Gain bandwidth product RL = 8Ω 2 MHz VN Output voltage noise, 20Hz ≤ F ≤ 20kHz, RL = 8Ω Unweighted, AV = 1 A-weighted, AV = 1 Unweighted, AV = 2.5 A-weighted, AV = 2.5 Unweighted, AV = 7.5 A-weighted, AV = 7.5 Unweighted, Standby A-weighted, Standby tWU Wake-up time(2) Cb =1μF 6 5.5 12 10.5 33 28 1.5 1 15 μVRMS ms 1. Dynamic measurements - 20*log(rms(Vout)/rms (Vripple)). Vripple is the super-imposed sinus signal relative to VCC. 2. Transition time from standby mode to fully operational amplifier. 5/35 Electrical characteristics Table 4. Electrical characteristics for VCC = +3.3V (all electrical values are guaranteed with correlation measurements at 2.6V and 5V), GND = 0V, Tamb = 25°C (unless otherwise specified) Symbol ICC ISTBY Voo TS4994FC Parameter Min. Typ. Max. Unit Supply current no input signal, no load 3 7 mA Standby current No input signal, VSTBY = VSM = GND, RL = 8Ω No input signal, VSTBY = VSM = VCC, RL = 8Ω 10 1000 nA Differential output offset voltage No input signal, RL = 8Ω 0.1 10 mV VCC - 0.9 V VICM Input common mode voltage CMRR ≤ -60dB 0.6 Pout Output power THD = 1% max, F= 1kHz, RL = 8Ω 300 500 mW THD + N Total harmonic distortion + noise Pout = 300mW rms, AV = 1, 20Hz ≤ F ≤ 20kHz, RL = 8Ω 0.5 % PSRRIG Power supply rejection ratio with inputs grounded(1) F = 217Hz, R = 8Ω, AV = 1, Cin = 4.7μF, Cb =1μF Vripple = 200mVPP 100 dB CMRR Common mode rejection ratio F = 217Hz, RL = 8Ω, AV = 1, Cin = 4.7μF, Cb =1μF Vic = 200mVPP 90 dB SNR Signal-to-noise ratio (A-weighted filter, AV = 2.5) RL = 8Ω, THD +N < 0.7%, 20Hz ≤ F ≤ 20kHz 100 dB GBP Gain bandwidth product RL = 8Ω 2 MHz VN Output voltage noise, 20Hz ≤ F ≤ 20kHz, RL = 8Ω Unweighted, AV = 1 A-weighted, AV = 1 Unweighted, AV = 2.5 A-weighted, AV = 2.5 Unweighted, AV = 7.5 A-weighted, AV = 7.5 Unweighted, Standby A-weighted, Standby tWU Wake-up time(2) Cb =1μF 6 5.5 12 10.5 33 28 1.5 1 15 1. Dynamic measurements - 20*log(rms(Vout)/rms (Vripple)). Vripple is the super-imposed sinus signal relative to VCC. 2. Transition time from standby mode to fully operational amplifier. 6/35 μVRMS ms TS4994FC Table 5. Electrical characteristics Electrical characteristics for VCC = +2.6V, GND = 0V, Tamb = 25°C (unless otherwise specified) Symbol ICC ISTBY Voo Parameter Min. Typ. Max. Unit Supply current No input signal, no load 3 7 mA Standby current No input signal, VSTBY = VSM = GND, RL = 8Ω No input signal, VSTBY = VSM = VCC, RL = 8Ω 10 1000 nA Differential output offset voltage No input signal, RL = 8Ω 0.1 10 mV VCC- 0.9 V VICM Input common mode voltage CMRR ≤-60dB 0.6 Pout Output power THD = 1% max, F= 1kHz, RL = 8Ω 200 300 mW THD + N Total harmonic distortion + noise Pout = 225mW rms, AV = 1, 20Hz ≤ F ≤ 20kHz, RL = 8Ω 0.5 % PSRRIG Power supply rejection ratio with inputs grounded(1) F = 217Hz, R = 8Ω, AV = 1, Cin = 4.7μF, Cb =1μF Vripple = 200mVPP 100 dB CMRR Common mode rejection ratio F = 217Hz, RL = 8Ω, AV = 1, Cin = 4.7μF, Cb =1μF Vic = 200mVPP 90 dB SNR Signal-to-noise ratio (A-weighted filter, AV = 2.5) RL = 8Ω, THD +N < 0.7%, 20Hz ≤ F ≤ 20kHz 100 dB GBP Gain bandwidth product RL = 8Ω 2 MHz VN Output voltage noise, 20Hz ≤ F ≤ 20kHz, RL = 8Ω Unweighted, AV = 1 A-weighted, AV = 1 Unweighted, AV = 2.5 A-weighted, AV = 2.5 Unweighted, AV = 7.5 A-weighted, AV = 7.5 Unweighted, Standby A-weighted, Standby tWU Wake-up time(2) Cb =1μF 6 5.5 12 10.5 33 28 1.5 1 15 μVRMS ms 1. Dynamic measurements - 20*log(rms(Vout)/rms (Vripple)). Vripple is the super-imposed sinus signal relative to VCC. 2. Transition time from standby mode to fully operational amplifier. 7/35 Electrical characteristics Current consumption vs. power supply voltage Figure 3. 4.0 4.0 No load 3.5 Tamb=25°C 3.5 Current Consumption (mA) Current Consumption (mA) Figure 2. TS4994FC 3.0 2.5 2.0 1.5 1.0 0.5 0.0 Current consumption vs. standby voltage 3.0 Standby mode=0V 2.5 Standby mode=5V 2.0 1.5 1.0 Vcc = 5V No load Tamb=25°C 0.5 0 1 2 3 4 0.0 5 0 1 2 Power Supply Voltage (V) Figure 4. Current consumption vs. standby voltage Figure 5. 4 5 Current consumption vs. standby voltage 3.0 3.0 2.5 Standby mode=0V Standby mode=3.3V 2.0 1.5 1.0 Vcc = 3.3V No load Tamb=25°C 0.5 0.0 0.0 0.6 1.2 1.8 2.4 Current Consumption (mA) Current Consumption (mA) 3.5 2.5 Standby mode=0V Standby mode=2.6V 2.0 1.5 1.0 Vcc = 2.6V No load Tamb=25°C 0.5 0.0 0.0 3.0 0.6 Standby Voltage (V) Figure 6. 1.2 1.8 2.4 Standby Voltage (V) Differential DC output voltage vs. common mode input voltage Figure 7. 1000 Power dissipation vs. output power 1.4 Av = 1 Tamb = 25°C 100 Vcc=3.3V Power Dissipation (W) Voo (mV) 3 Standby Voltage (V) Vcc=2.5V 10 Vcc=5V 1 Vcc=5V 1.2 F=1kHz THD+N