TS4994FC

TS4994FC 1.2 W differential input/output audio power amplifier with selectable standby Features ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ 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 TS4994EIJT - Flip-chip (9 bumps) Gnd VOBypass VIN+ 7 6 5 VO+ Stdby VIN- 8 1 9 2 VCC 4 3 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. The TS4994 is designed for high quality audio applications such as mobile phones and requires few external components. 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. Applications ■ ■ ■ ■ Mobile phones (cellular / cordless) Laptop / notebook computers PDAs Portable audio devices Order codes Part number TS4994EIKJT -40°C, +85°C TS4994EIJT Temperature range Package FC9 with back coating Lead free flip-chip9 Packaging Marking A94 Tape & reel A94 December 2006 Rev 2 1/35 www.st.com 35 Contents TS4994FC Contents 1 2 3 4 Application component information . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10 4.11 4.12 Differential configuration principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Gain in typical application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Common mode feedback loop limitations . . . . . . . . . . . . . . . . . . . . . . . . . 23 Low and high frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Calculating the influence of mismatching on PSRR performance . . . . . . 25 CMRR performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Power dissipation and efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Decoupling of the circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Wake-up time: tWU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Shutdown time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Pop performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Single-ended input configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 5 6 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 2/35 TS4994FC Application component information 1 Application component information Components Cs Cb Rfeed Rin Cin Functional description Supply bypass capacitor that provides power supply filtering. Bypass capacitor that provides half supply filtering. Feedback resistor that sets the closed loop gain in conjunction with Rin AV = closed loop gain = Rfeed/Rin. Inverting input resistor that sets the closed loop gain in conjunction with Rfeed. Optional input capacitor making a high pass filter together with Rin. (FCL = 1/(2πRinCin). Figure 1. Typical application VCC Rfeed1 20k 2 VCC Diff. input - Cin1 + Rin1 3 VinGND Cs 1u + GND 220nF 20k Cin2 Rin2 1 Vin+ 8 Bypass Cb 1u + Bias Standby 220nF 20k Diff. Input + Optional + Mode GND Stdby 4 GND 6 GND 9 GND VCC GND VCC + 20k Vo+ 5 Vo7 8 Ohms TS4994IJ Rfeed2 3/35 Absolute maximum ratings and operating conditions TS4994FC 2 Table 1. Symbol VCC Vi Toper Tstg Tj Rthja Pdiss ESD Absolute maximum ratings and operating conditions Absolute maximum ratings Parameter Supply voltage (1) Input voltage (2) Value 6 GND to VCC -40 to + 85 -65 to +150 150 (3) Unit V V °C °C °C °C/W W kV V mA °C Operating free air temperature range Storage temperature Maximum junction temperature Thermal resistance junction to ambient Power dissipation Human body model Machine model Latch-up immunity Lead temperature (soldering, 10sec) 250 internally limited 2 200 200 260 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. Symbol VCC VSM Operating conditions Parameter Supply voltage Standby mode voltage input: Standby active LOW Standby active HIGH Standby voltage input: Device ON (VSM = GND) or device OFF (VSM = VCC) Device OFF (VSM = GND) or device ON (VSM = VCC) Thermal shutdown temperature Load resistor Thermal resistance junction to ambient Value 2.5 to 5.5 VSM=GND VSM=VCC 1.5 ≤ VSTBY ≤ VCC GND ≤ VSTBY≤ 0.4 (1) 150 ≥4 100 Unit V V VSTBY TSD RL Rthja V °C Ω °C/W 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 Table 3. Symbol ICC Electrical characteristics Electrical characteristics for VCC = +5V, GND = 0V, Tamb = 25°C (unless otherwise specified) Parameter Supply current No input signal, no load Standby current No input signal, VSTBY = VSM = GND, RL = 8Ω No input signal, VSTBY = VSM = VCC, RL = 8Ω Differential output offset voltage No input signal, RL = 8Ω Input common mode voltage CMRR ≤ -60dB Output power THD = 1% Max, F= 1kHz, RL = 8Ω Total harmonic distortion + noise Pout = 850mW rms, AV = 1, 20Hz ≤ F ≤ 20kHz, RL = 8Ω Power supply rejection ratio with inputs grounded(1) F = 217Hz, R = 8Ω, AV = 1, Cin = 4.7μF, Cb =1μF Vripple = 200mVPP Common mode rejection ratio F = 217Hz, RL = 8Ω, AV = 1, Cin = 4.7μF, Cb =1μF Vic = 200mVPP Signal-to-noise ratio (A-weighted filter, AV = 2.5) RL = 8Ω, THD +N < 0.7%, 20Hz ≤ F ≤ 20kHz Gain bandwidth product RL = 8Ω 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 Wake-up time(2) Cb =1μF 0.6 0.8 1.2 0.5 Min. Typ. 4 Max. 7 Unit mA ISTBY 10 1000 nA Voo VICM Pout THD + N 0.1 10 VCC - 0.9 mV V W % PSRRIG 100 dB CMRR 90 dB SNR GBP 100 2 dB MHz VN 6 5.5 12 10.5 33 28 1.5 1 15 μVRMS tWU 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. TS4994FC 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) Parameter Supply current no input signal, no load Standby current No input signal, VSTBY = VSM = GND, RL = 8Ω No input signal, VSTBY = VSM = VCC, RL = 8Ω Differential output offset voltage No input signal, RL = 8Ω Input common mode voltage CMRR ≤ -60dB Output power THD = 1% max, F= 1kHz, RL = 8Ω Total harmonic distortion + noise Pout = 300mW rms, AV = 1, 20Hz ≤ F ≤ 20kHz, RL = 8Ω Power supply rejection ratio with inputs grounded(1) F = 217Hz, R = 8Ω, AV = 1, Cin = 4.7μF, Cb =1μF Vripple = 200mVPP Common mode rejection ratio F = 217Hz, RL = 8Ω, AV = 1, Cin = 4.7μF, Cb =1μF Vic = 200mVPP Signal-to-noise ratio (A-weighted filter, AV = 2.5) RL = 8Ω, THD +N < 0.7%, 20Hz ≤ F ≤ 20kHz Gain bandwidth product RL = 8Ω 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 Wake-up time(2) Cb =1μF 0.6 300 500 0.5 Min. Typ. 3 10 Max. 7 1000 Unit mA nA Symbol ICC ISTBY Voo VICM Pout THD + N 0.1 10 VCC - 0.9 mV V mW % PSRRIG 100 dB CMRR 90 dB SNR GBP 100 2 dB MHz VN 6 5.5 12 10.5 33 28 1.5 1 15 μVRMS tWU 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. 6/35 TS4994FC Table 5. Symbol ICC Supply current No input signal, no load Standby current No input signal, VSTBY = VSM = GND, RL = 8Ω No input signal, VSTBY = VSM = VCC, RL = 8Ω Differential output offset voltage No input signal, RL = 8Ω Input common mode voltage CMRR ≤-60dB Output power THD = 1% max, F= 1kHz, RL = 8Ω Total harmonic distortion + noise Pout = 225mW rms, AV = 1, 20Hz ≤ F ≤ 20kHz, RL = 8Ω Power supply rejection ratio with inputs grounded(1) F = 217Hz, R = 8Ω, AV = 1, Cin = 4.7μF, Cb =1μF Vripple = 200mVPP Common mode rejection ratio F = 217Hz, RL = 8Ω, AV = 1, Cin = 4.7μF, Cb =1μF Vic = 200mVPP Signal-to-noise ratio (A-weighted filter, AV = 2.5) RL = 8Ω, THD +N < 0.7%, 20Hz ≤ F ≤ 20kHz Gain bandwidth product RL = 8Ω 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 Wake-up time(2) Cb =1μF 0.6 200 Electrical characteristics Electrical characteristics for VCC = +2.6V, GND = 0V, Tamb = 25°C (unless otherwise specified) Parameter Min. Typ. 3 Max. 7 Unit mA ISTBY 10 1000 nA Voo VICM Pout THD + N 0.1 10 VCC- 0.9 mV V mW % 300 0.5 PSRRIG 100 dB CMRR 90 dB SNR GBP 100 2 dB MHz VN 6 5.5 12 10.5 33 28 1.5 1 15 μVRMS tWU 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 TS4994FC Figure 2. Current consumption vs. power supply voltage Figure 3. Current consumption vs. standby voltage 4.0 No load 3.5 Tamb=25°C Current Consumption (mA) 4.0 3.5 Current Consumption (mA) 3.0 2.5 2.0 1.5 1.0 0.5 0.0 0 1 2 3 4 5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 0 1 2 Standby mode=0V Standby mode=5V Vcc = 5V No load Tamb=25°C 3 4 5 Power Supply Voltage (V) Standby Voltage (V) Figure 4. Current consumption vs. standby voltage Figure 5. Current consumption vs. standby voltage 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 0.0 Vcc = 3.3V No load Tamb=25°C 0.6 1.2 1.8 2.4 3.0 Standby mode=0V Standby mode=3.3V 3.0 2.5 2.0 1.5 1.0 0.5 0.0 0.0 Vcc = 2.6V No load Tamb=25°C 0.6 1.2 1.8 2.4 Standby mode=0V Standby mode=2.6V Current Consumption (mA) Standby Voltage (V) Current Consumption (mA) Standby Voltage (V) Figure 6. Differential DC output voltage vs. common mode input voltage Figure 7. Power dissipation vs. output power 1000 Av = 1 Tamb = 25°C Power Dissipation (W) 1.4 Vcc=5V 1.2 F=1kHz THD+N