EB-TA2022 CLASS-T DIGITAL AUDIO AMPLIFIER 2 CHANNEL TA2022 EVALUATION BOARD

Transcription

1 Tripath Technology, Inc. - Technical Information EB-TA0 CLASS-T DIGITAL AUDIO AMPLIFIER CHANNEL TA0 EVALUATION BOARD Technical Information Revision.0 March 00 GENERAL DESCRIPTION The EB-TA0 Version.0 is a stereo 00W per channel audio amplifier designed to provide a simple and straightforward environment for the evaluation of the TA0 amplifier. This evaluation board includes a circuit that will automatically trim any DC offset at the output and a relay. For additional documentation on the TA0, see the TA0 Data Sheet. APPLICATIONS Mini/Micro Component Systems Home Theater Receivers Car stereo head units & trunk amplifiers Powered DVD Systems BENEFITS More power per cubic inch for 00W per channel design Simplifies thermal management Signal Quality comparable to linear amplifiers Simple building block for multi-channel design FEATURES High Power: Ω,.0% THD+N Low Noise Floor: 0uV A-weighted Low Distortion:.0% 7W, Ω High Efficiency: 9% for 8Ω loads 87% for Ω loads Dynamic Range = 0dB Over-Current Protection Over and Under Voltage Protection Over Temperature Protection Single Ended Outputs EB-TA0 Rev..0/0.0

2 Tripath Technology, Inc. - Technical Information OPERATING INSTRUCTIONS BOARD CONNECTION DIAGRAM J TA0 V+ Pgnd V- Vo GND GND Vo AGND V IN AGND IN AWAKE MUTE J J Audio Source OUT AGND OUT + - V VPP Pgnd VNN Speaker Right Speaker Left Three external power supplies are required to operate the EB-TA0: VPP, VNN (referenced to Pgnd), and V (referenced to Agnd). The VPP and VNN form a split rail supply referenced to Pgnd. The V ground (Agnd) must be kept separate from the VPP and VNN ground (Pgnd). Agnd and Pgnd are joined at a common point on the EB-TA0 near headers J and J. Minimum and Maximum supply voltages are +/-0V and +/-6V, respectively, depending on the load impedance. It is not recommended that the EB-TA0 be operated above +/-V when driving Ω loads, single ended, as the internal current limit circuit may activate, causing the amplifier to mute. The VPP and VNN power supply connection, J, is through a 7-Pin 0.6 spaced header. The female terminal housing for this header is Molex Please see TABLE for header connections. The V power supply connection, J, is through a -Pin 0.00 spaced header. The female terminal housing for this header is Molex Please see TABLE for header connections. EB-TA0 Rev..0/0.0

3 Tripath Technology, Inc. - Technical Information TABLE TABLE J Connector Pin# Connection J Connector Pin# Connection Pin Agnd Pin Vo Pin V Pin GND Pin IN Pin GND Pin Agnd Pin Vo Pin IN Pin VNN Pin6 Pgnd Pin7 VPP OUTPUT The output connection for each channel of the EB-TA0 is made at pins of header J. The output of the TA0 is single-ended, therefore each output has a positive output (Vo and Vo) and a ground (GND and GND). INPUT The input connection for each channel of the EB-TA0 is made at pins of header J. The left and right inputs should be connected to IN (pin) and IN (pin). These inputs share a common ground referenced to Agnd (pin). JUMPER SETTINGS There is a -pin header for the MUTE control of the TA0. With the jumper placed in the AWAKE position the part is un-muted by grounding (AGND) the mute pin. When the jumper is placed in the MUTE position the mute pin is pulled high (V) and the amplifier is muted. OUTPUT OFFSET NULL AND RELAY There is an automatic offset trim circuit for each channel using an LM8 op-amp. Once the LM8 trims any DC to 0Vdc a comparator allows a relay to close. GAIN SETTING The gain of the EB_TA0 Version.0 is set to 8V/V. The gain of the TA0 is the product of the input stage and the modulator stage. The input stage gain is set to unity. Before changing the gain of the TA0, please refer to the TA0 Amplifier Gain section of the TA0 Data Sheet. EB-TA0 Rev..0/0.0

4 Tripath Technology, Inc. - Technical Information Performing Measurements on the EB-TA0 Version.0 The TA0 operates by generating a high frequency switching signal based on the audio input. This signal is sent through a low-pass filter that recovers an amplified version of the audio input. The frequency of the switching pattern is spread spectrum in nature and typically varies between 00kHz and MHz, which is well above the 0Hz 0kHz audio band. The pattern itself does not alter or distort the audio input signal, but it does introduce some inaudible components. The measurements of certain performance parameters, particularly noise related specifications such as THD+N, are significantly affected by the design of the low-pass filter used on the output as well as the bandwidth setting of the measurement instrument used. Unless the filter has a very sharp roll-off just beyond the audio band or the bandwidth of the measurement instrument is limited, some of the inaudible noise components introduced by the TA0 amplifier switching pattern will degrade the measurement by including out of band (audio) energy. One feature of the TA0 is that it does not require large multi-pole filters to achieve excellent performance in listening tests, usually a more critical factor than performance measurements. Though using a multi-pole filter may remove high-frequency noise and improve THD+N type measurements (when they are made with wide-bandwidth measuring equipment), these same filters degrade frequency response. The EB-TA0 has a simple two-pole output filter with excellent performance in listening tests. (See Application Note for additional information on bench testing) Contact Information TRIPATH TECHNOLOGY, INC 60 Orchard Parkway, San Jose, CA P F For more Sales Information, please visit For more Technical Information, please visit EB-TA0 Rev..0/0.0

5 EB-TA0 Ver..0 Revised: Thursday, December 09, 00 Bill Of Materials Item Quantity Reference Value PCB Footprint Rating Tolerance Manufacturer Manufacturer Part # Source Source Part # C,C6,C,C6.uF cape\00\00 V Panasonic ECE-AEKKR Digikey P97-ND C uf, 0V cape\00\00 0V Panasonic ECE-AAKS0 Digikey P960-ND C7,C8,C9,C0 0.uF;0V cap080 X7R 0V Murata GRMBR7H0KA0L Digikey ND C8,C7 7uF;6v cape\00\00 6V Panasonic ECE-ACKA70 Digikey P80-ND C,C9 0uF;0V cape\00\00 Low ESR 0V Panasonic EEU-FCHS Digikey P06-ND 6 C,C 0.uF;0V 080 X7R 0V Murata GRMBR7H0KA0L Digikey ND 7 C 00uF;v cape\00\00 8 C7,C8,C9,C0 0.uF;0V cap00 0V Panasonic ECQ-VHJL Digikey P667-ND 9 C,C,C8,C9.uF;6V 080 X7R 6V Murata GRM9R7C0KA0D Digikey ND 0 C,C 0.uF;00V 06 X7R 00V Kemet C06C0KRACTU Digikey ND C6 0pF;0V 080 X7R 0V Yageo 080RK9B0D Digikey -9--ND C7 90pF;0V 080 X7R 0V Yageo 080R9K9B0D Digikey -9--ND D,D8,D9 B00/B SMA A 00V Diodes Inc. B00- Digikey B00DITR-ND D N do 00mW 6.8V Diodes Inc. NB-T Digikey NBDICT-ND D n8 do Diodes Inc. N8-T Digikey N8DICT-ND 6 D N do 00mW V Diodes Inc. NB-T Digikey NBDICT-ND 7 D,D,D,D MURS0 SMB A 00V ON Semi MURS0T Digikey MURS0TOSTR-ND 8 D6 LED 9 J CON,.00" Header SIP-P Molex -0-0 Digikey WM00-ND 0 J CON,.00" Header HEADER_INA Molex --0 Digikey WM0-ND J CON7,.6" Header HDR7P6-C7C Molex Digikey WM6-ND J0,J9 SCREW TERMINAL TERM_SCREW Keystone 890 Digikey 890K-ND K DPDT RELAY RLY-RLY-DPDT Tyco RTE0F Digikey PB97-ND L 00uH ind\00\00 Toko 87LY-0J Digikey TK00-ND L6,L uh 6RHBPA 0A American Cores AW690-T--V 6 Q,Q,Q N7000 TO-9 Fairchild N7000 Digikey N7000FS-ND 7 Q N906 TO-9 Fairchild N906BU Digikey N906FS-ND 8 R k R,R0,R,R,R 0K RES080 0 R,R,R 00k RES080 R 00k RES080 R 80.6k;% RES080 R6 0k RES080 R7.9k;% RES080 R8.0k;% RES080 6 R9 k RES080 7 R6 00 RES080 8 R7 k RES080 9 R9,R8 0k RES080 0 R0,R,R,R k;% 080 R,R7,R,R 9.k:% 080 R,R,R,R 0K 080 R6,R8,R9,R0.k;% 080 R 8.k, % 080 R6,R 9k;% R7,R R0 k R6 6;W res-/w W Panasonic ERX-SJ6RA Digikey P6.W-BK-ND 9 R7 6;W res-/w W Panasonic ERX-SJ6RA Digikey P6.W-BK-ND 0 STA,STA,STA,STA STANDOFF STANDOFF_0 Keystone 80 Digikey 80K-ND U LM8 DIP8 TI LM8P Digikey ND U tornado_p_zip_6 DIP-P-STAGGERAAAA Tripath Technology TA0 U LM9 DIP TI LM9N Digikey ND standoff nut Digikey H66-ND screw terminal screw Digikey H-ND 6 TA0 washer Digikey H7-ND 7 TA0 screw Digikey H78-ND

6 D D C C B B A A T68- Core(AWG) TA0-00 T68- Core(AWG) Schematic.0 EB-TA0 Ver..0 B Friday, March 0, 00 Title Size Document Number Rev Date: Sheet of VN0FDBK Vnsense Vpsense Vnsense VN0FDBK Vpsense R 0K U tornado_p_zip_ VBOOT VN0 VPP VN0SW HOCOM OUT VNN VNN OUT HOCOM VPP VBOOT VN0FBK AGND V REF VNSENSE VPSENSE AGND V OAOUT INV MUTE OAOUT INV BIASCAP FBKGND FBKOUT FBKGND FBKOUT HMUTE R 9.k C8 0.uF;0V C6.uF, V C 00uF;v C8 7uF;6v C.uF, V J0 SCREW TERMINAL R6 6;W D B00/B R0 k C9 0.uF;0V L 00uH;JWMiller k or Toko 87LY-0J R 9.k R 9.k C7 90pF;0V D MURS0 C9 0.uF;6v R7 6;W J9 R 0k C 0.uF;0v D8 B00/B L6 uh J HEADER R9.k R 0k STA STANDOFF STA STANDOFF R6 9k STA STANDOFF STA STANDOFF C.uF;6V R 9k J CON7 6 7 J CON C7 0.uF;0V C 0.uF;v R k R 8.k D MURS0 R7 0 C.uF;6V C 0uF;0V R0 k C6 0pF;0V D MURS0 R8 0 R6.k C0 0.uF;0V C9 0uF;0V L uh C7 7uF;6v C 0.uF;00V D9 B00/B C 0.uF;00V R k R0.k R 0K R8.k C8 0.uF;6v R7 9.k D MURS0 R k R k D6 LED IN V- IN V IN V Vob V+ V Vob V V- MUTE V- V- V+ AGnd MUTE IN V+ VN0 AGnd AGnd AGnd PGnd PGnd PGnd PGnd PGnd PGnd HMUTE FBKGND FBKGND Voa Voa AGnd

7 C.uF D C Voa HMUTE Voa R 0k R 0k C8 0.uF UA LM8 R 00K C7 0.uF R9 0k R 80k R7 k R8 k R9 k Q N7000 V+ R7 k UA LM9 UB LM9 UC LM9 C0 0.uF D N R6 0k Q N7000 R 0K D N C uf, 0V R 00k Q N906 R 00k V+ Q N7000 D n8 R6 00 Vob Vob FBKGND 6 K 7 8 DPDT RELAY Voa Voa D C B R 0k C9 0.uF R0 0k R 00K UB LM8 C6.uF R8 0k UD LM9 FBKGND B A A Title OFFSET CORRECTION & RELAY CIRCUIT Size Document Number Rev B SCHEMATIC.0 Date: Friday, March 0, 00 Sheet of

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