DIGITAL AUDIO AMPLIFIER USING DIGITAL POWER PROCESSING

Tri path Technol og y, I nc. - Techni cal I nformation www.DataSheet4U.com TAA2008 STEREO 9W (8Ω) CLASS-T™ DIGITAL AUDIO AMPLIFIER USING DIGITAL POWER PROCESSING™ TECHNOLOGY TECHNICAL INFORMATION Revision 1.0 – May 2006 GENERAL DESCRIPTION The TAA2008 is a 9W/ch continuous average two-channel Class-T Digital Audio Power Amplifier IC using Tripath’s proprietary Digital Power Processing™ technology. The TAA2008, in a QFN package, along with extremely high efficiency, allows for a very compact amplifier design. Class-T amplifiers offer both the audio fidelity of Class-AB and the power efficiency of Class-D amplifiers. APPLICATIONS FEATURES LCD TV’s LCD Monitors Plasma TV’s Computer/PC Multimedia Battery Powered Systems BENEFITS Fully integrated solution with FETs Compact packaging and board design Reduced system cost with no heat sink Dramatically improves efficiency versus ClassAB Signal fidelity equal to high quality linear amplifiers High dynamic range compatible with digital media such as CD, DVD, and Internet audio Capable of driving a wide range of load impedances TYPICAL PERFORMANCE THD+N versus Output Power 10 VDD = 12V f = 1kHz 5 A = 12V/V V BW = 22Hz - 20kHz(AES17) 2 R L =16Ω 1 R L =8Ω R L =6Ω R L =4Ω Class-T architecture Single Supply Operation “Audiophile” Quality Sound 0.025% THD+N @ 5W, 8Ω 0.1% IHF-IM @ 1W, 8Ω 6.3W @ 8Ω, 0.1% THD+N 3.5W @ 16Ω, 0.1% THD+N High Power 14.25W @ 6Ω, 10% THD+N 9W @ 8Ω, 10% THD+N 5W @ 16Ω, 10% THD+N Extremely High Efficiency 89% @ 5W, 16Ω 86% @ 9W, 8Ω Dynamic Range = 98.5 dB Mute and Sleep modes Improved turn-on & turn-off pop suppression Over-current protection with automatic restart circuit Over-temperature protection Space saving 32-pin 8mm x 8mm x 1mm QFN package with exposed pad REF OVRLDB AGND2 V5A OAOUT1 INV1 MUTE N C 25 26 27 28 29 30 31 32 1 2 3 4 5 6 7 8 24 23 22 21 20 19 18 17 AGND1 V5D DCAP1 DCAP2 5VGEN CPUMP PGND1 VDDA 0.5 0.2 0.1 0.05 OAOUT2 INV2 BIASCAP AGND3 SLEEP FAULT PGND2 DGND THD+N (%) 16 15 14 13 12 11 10 9 0.02 N C OUTP1 VDD1 OUTM1 OUTM2 VDD2 OUTP2 N C 0.01 1 2 3 4 5 6 7 8 9 10 20 Output Power (W) 1 TAA2008 –KLi/1.0/05.06 Tri path Technol og y, I nc. - Techni cal I nformation www.DataSheet4U.com A B S O L U T E M A X I M U M R A T I N G S (Note 1) SYMBOL VDD V5 SLEEP MUTE TSTORE TA TJ ESDHB ESDMM Supply Voltage Input Section Supply Voltage SLEEP Input Voltage MUTE Input Voltage Storage Temperature Range Operating Free-air Temperature Range Junction Temperature ESD Susceptibility – Human Body Model (Note 2) ESD Susceptibility – Machine Model (Note 3) PARAMETER Value 16 6.0 -0.3 to 6.0 -0.3 to V5+0.3 -40 to 150 0 to 70 150 2000 200 UNITS V V V V °C °C °C V V Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Note 2: Human body model, 100pF discharged through a 1.5KΩ resistor. Note 3: Machine model, 220pF – 240pF discharged through all pins. O P E R A T I N G C O N D I T I O N S (Note 4) SYMBOL VDD VIH VIL Supply Voltage (Note 5) High-level Input Voltage (MUTE, SLEEP) Low-level Input Voltage (MUTE, SLEEP) PARAMETER MIN. 8.5 3.5 1 TYP. 12 MAX. 14.0 UNITS V V V Note 4: Recommended Operating Conditions indicate conditions for which the device is functional. See Electrical Characteristics for guaranteed specific performance limits. Note 5: Operation above 13.2V requires the use of low and high side schottky diodes as well as 220uF for CSW. See the Application Section for additional information THERMAL CHARACTERISTICS SYMBOL θJA PARAMETER Junction-to-ambient Thermal Resistance (note 6) VALUE 22 UNITS °C/W Note 6: The θJA value is based on the exposed pad being soldered down to the printed circuit board. The exposed pad must be soldered to an exposed copper area on the printed circuit board for proper thermal and electrical performance. 2 TAA2008 –KLi/1.0/05.06 Tri path Technol og y, I nc. - Techni cal I nformation www.DataSheet4U.com E L E C T R I C A L C H A R A C T E R I S T I C S (Note 7) See Test/Application Circuit. Unless otherwise specified, VDD = 12V, f = 1kHz, Measurement Bandwidth = 20kHz, RL = 8Ω, TA = 25 °C, package exposed pad soldered to the printed circuit board. SYMBOL PO PARAMETER Output Power (Continuous Average/Channel) CONDITIONS THD+N = 0.1% RL = 6Ω RL = 8Ω RL = 16Ω RL = 6Ω RL = 8Ω RL = 16Ω TBD MIN. TYP. 8 6.3 3.5 12 9 5 14.25 12 6.3 31 0.25 61 0.022 0.1 98.5 50 65 85 60 75 65 89 50 3.5 1 A-Weighted, input AC grounded 100 150 150 0.5 36 2 75 MAX. UNITS W W W W W W W W W mA mA mA % % dB dB dB dB dB % mV V V µV THD+N = 10% VDD = 13.2V, THD+N=10% RL = 6Ω RL = 8Ω RL = 16Ω IDD,MUTE IDD, SLEEP Iq THD + N IHF-IM SNR CS PSRR η VOFFSET VOH VOL eOUT Mute Supply Current Sleep Supply Current Quiescent Current Total Harmonic Distortion Plus Noise IHF Intermodulation Distortion Signal-to-Noise Ratio Channel Separation Power Supply Rejection Ratio Power Efficiency Output Offset Voltage High-level output voltage (FAULT & OVERLOAD) Low-level output voltage (FAULT & OVERLOAD) Output Noise Voltage MUTE = VIH SLEEP = VIH VIN = 0 V PO = 5W/Channel 19kHz, 20kHz, 1:1 (IHF) A-Weighted, POUT = 9W, RL = 8Ω f = 1 kHz 20 Hz < f < 20 kHz VDD = 9V to 13.2V Vripple = 100mVrms, f=1kHz POUT = 5W/Channel, RL = 16Ω No Load, MUTE = Logic Low Note 7: Minimum and maximum limits are guaranteed but may not be 100% tested. 3 TAA2008 –KLi/1.0/05.06 Tri path Technol og y, I nc. - Techni cal I nformation www.DataSheet4U.com PIN DESCRIPTION Pin 1, 29 2, 30 3 4, 24, 27 5 6 7, 18 8 10, 12; 15, 13 11, 14 17 19 20 21,22 Function OAOUT2, OAOUT1 INV2, INV1 BIASCAP AGND3, AGND1, AGND2 SLEEP FAULT PGND2, PGND1 DGND OUTP2 & OUTM2; OUTP1 & OUTM1 VDD2, VDD1 VDDA CPUMP 5VGEN DCAP2, DCAP1 Description Input stage output pins. Single-ended inputs. Inputs are a “virtual” ground of an inverting opamp with approximately 2.4VDC bias. Input stage bias voltage (approximately 2.4VDC). Analog Ground When set to logic high, device goes into low power mode. If not used, this pin should be grounded A logic high output indicates thermal overload, or an output is shorted to ground, or another output. Power Grounds (high current) Digital Ground. Connect to AGND locally (near the TAA2008). Bridged output pairs Supply pins for high current H-bridges, nominally 12VDC. Analog 12VDC. Connect to same supply as VDD1 and VDD2. Charge pump output (nominally 10V above VDDA) Regulated 5VDC source used to supply power to the input section (pins 23 and 28). Charge pump switching pins. DCAP1 (pin 22) is a free running 300kHz square wave between VDDA and DGND (12Vpp nominal). DCAP2 (pin 21) is level shifted 10 volts above DCAP1 (pin 22) with the same amplitude (12Vpp nominal), frequency, and phase as DCAP1. Digital 5VDC, Analog 5VDC Internal reference voltage; approximately 1.0 VDC. A logic low output indicates the input signal has overloaded the amplifier. When set to logic high, both amplifiers are muted and in idle mode. When low (grounded), both amplifiers are fully operational. If left floating, the device stays in the mute mode. This pin should be tied to GND if not used. Not connected. Not bonded internally. 23, 28 25 26 31 9, 16, 32 V5D, V5A REF OVERLOADB MUTE NC TAA2008 PINOUT 32-pin QFN (Top View) OVRLDB OAOUT1 INV1 MUTE 30 29 AGND2 REF V5A NC 1 2 3 4 5 6 7 8 12 11 10 13 14 15 9 31 32 28 27 26 25 OAOUT2 INV2 BIASCAP AGND3 SLEEP FAULT PGND2 DGND 24 23 22 21 20 19 18 17 AGND1 V5D DCAP1 DCAP2 5VGEN CPUMP PGND1 VDDA 16 OUTM1 OUTM2 VDD2 OUTP2 NC VDD1 OUTP1 NC 4 TAA2008 –KLi/1.0/05.06 Tri path Technol og y, I nc. - Techni cal I nformation www.DataSheet4U.com APPLICATION / TEST CIRCUIT T AA2008 OA OUT1 29 RF 20K Ω INV 1 RI 20K Ω CA 0.1uF (Pin 4) 5V V DD1 V DD1 Lo 10uH, 2A CI 2.2uF + 30 15 OUTP1 D O ** BIA SCA P 3 Proces s ing & Modulation PGND1 V DD1 (Pin 18) (Pin 18) V DD1 Lo 10uH, 2A Co 0.22uF CZ 0.22uF C DO 0.01uF RL 8 Ω or 16 Ω 13 OUTM1 Co 0.22uF RZ 10 Ω , 1/4W D O ** PGND1 (Pin 18) FA ULT (c onnec t to MUTE f or auto res tart) OV ERLOA DB V DD2 5V MUTE 31 6 26 CI 2.2uF + OA OUT2 RF 20K Ω INV 2 RI 20K Ω 1 V DD2 Lo 10uH, 2A 2 10 OUTP2 D O ** 25 (Pin 24) R RE F 8.25K Ω , 1% REF Proces s ing & Modulation PGND2 V DD2 (Pin 7) (Pin 7) V DD2 Lo 10uH, 2A Co 0.22uF CZ 0.22uF C DO 0.01uF 22 +12V 1M Ω CD 0.1uF DCA P1 12 OUTM2 Co RZ 0.22uF 10 Ω , 1/4W RL 8 Ω or 16 Ω D O ** 21 5 DCA P2 PGND2 SLEEP CPUMP 19 (Pin 7) N.C. 0.1uF 23 CS 0.1uF To Pin 20 CS 0.1uF + V 5D A GND1 V5A A GND2 A GND3 5V V DDA DGND 5V GEN 17 8 20 CP 1uF CS 0.1uF CS 0.1uF To Pins 23,28 24 28 27 4 V DD1 PGND1 14 18 C SW 0.1uF + V DD (+12V ) CS W ** 100uF, 16V 9 16 NC 32 NC NC V DD2 PGND2 11 7 C SW 0.1uF Note: A nalog and Digital/Pow er Grounds mus t be c onnec ted loc ally at the TA A 2008 A nalog Ground Digital/Pow er Ground ** For V DD v oltages abov e 13.2V , output diodes (DO ) s hould be us ed and the v alue of CS W s hould be inc reas ed to 220uF. A ll Diodes are Motorola MBRS130T3 or equiv alent. 5 TAA2008 –KLi/1.0/05.06 Tri path Technol og y, I nc. - Techni cal I nformation www.DataSheet4U.com E X T E R N A L C O M P O N E N T S D E S C R I P T I O N (Refer to the Application/Test Circuit) Components RI RF CI RREF CA CD CP Description Inverting Input Resistance to provide AC gain in conjunction with RF. This input is biased at the BIASCAP voltage (approximately 2.4VDC). Feedback resistor to set AC gain in conjunction with RI; A V = 12(RF / RI ) . Please refer to the Amplifier Gain paragraph in the Application Information section. AC input coupling capacitor which, in conjunction with RI, forms a highpass filter at fC = 1 (2πRICI ) CS CSW CZ RZ DO LO Bias resistor. Locate close to pin 25 (REF) and ground at pin 24 (AGND1). BIASCAP decoupling capacitor. Locate close to pin 3 (BASCAP) and ground at pin 4 (AGND3). Charge pump input capacitor. This capacito