tripath technology, inc. - technical information 1 EB-TA2024, 04.02 EB-TA2024 2x15w class-t digital audio amplifier evaluation board using digital power processing tm technology technical information revision b- april 2002 general description the EB-TA2024 evaluation board is bas ed on the ta2024, digital audio power amplifier from tripath technology. the board is designed to provide a simple and straightforward environment for the eval uation of the tripat h ta2024. the board can be connected to a +12v supply usi ng cables with standard banana connectors. audio inputs are via standard rca jacks. the ta2024 provides amplification for two channels of audio. signal outputs are on four banana connectors to which any 4 ? or 8 ? passive speakers may be connected. features class-t architecture proprietary digital power processing tm technology requires single +12v power source output power (per channel @ v s = 12v): 15w per channel (4 ? , 10% thd+n) 10w per channel (4 ? 0.1%, thd+n) easy engineering evaluation platform for tripath technology?s ta2024 product ?audiophile performance? typically: 0.04% thd+n (9wrms, 4 ? ) 0.18% ihf-im (1wrms, 4 ? ) efficiency - >88% @ full power (r l = 8 ? ) no heat sink required up to 15w per channel mute and sleep inputs turn-on & turn-off pop suppression intelligent short-circuit protection intelligent over-temperature protection connects to any passive 4/8 ? speakers takes standard audio line output from any sound system cost-effective 2-layer pcb design 36-pin power sop package ta2024 evaluation board
tripath technology, inc. - technical information 2 EB-TA2024, 04.02 introduction the EB-TA2024 was designed to provide the designer with a simple means of evaluating the performance and functionality of the ta2024 2x15w am plifier ic from tripath technology. the eb- ta2024 is very simple to operate and r equires only the following to evaluate: stereo signal source 12v power supply ( not to exceed 13.2v ) two loads ( 4-ohm minimum ) for more information on the ta2024, please re fer to the ta2024 datasheet (www.tripath.com). in1 in2 mute sleep power in +12v, gnd output 1 out1+, out1- output 2 out2+, out2- inputs outputs EB-TA2024 board connection and operation figure 1 shows the connections required for proper operation of the EB-TA2024. input connection audio input to the board is provi ded via two rca female connectors. connector name channel in1 channel 1 input in2 channel 2 input power connection the ta2024 requires a +12v power suppl y (13.2v max) to operate. power to the board is provided via the red and black female banana connectors. the positive 12v from the power supply connects to the red banana connector labeled 12v+. the ground connection of power supply attaches to the black banana connector labeled gnd.
tripath technology, inc. - technical information 3 EB-TA2024, 04.02 figure 1: EB-TA2024 connections connector label description color 12v+ positive of the 12v power supply red gnd negative (gnd) of 12v power supply black warning : do not exceed maximum operating supply voltage of 13.2v output connection there are four female banana connectors on the evaluation board for speaker output. the ta2024 has differential outputs (bridged) so it requires two wires per channel to connect to each speaker. connector label description color out1+ positive output of channel 1 white out1- negative output of channel 1 blue out2+ positive output of channel 2 white out2- negative output of channel 2 blue jumper settings there are two jumpers on the EB-TA2024 board, which should both be connected (shorted) for normal operation. jumper, j1 connects the fault out put to the mute pin, allowing the part to mute itself when a fault condition (over-current, etc.) is detected. jumper, j2 connects the sleep pin to gnd, effectively disabling sleep for normal operation. if j2 is removed, the part will go into sleep mode. jumper purpose j1 connects fault to mute j2 connects sleep to gnd 4 ? ?
tripath technology, inc. - technical information 4 EB-TA2024, 04.02 gain settings the ta2024 amplifier gain can be adjusted by modifyi ng external resister values. r2 and r5 are used to set the gain for channel 1, while r4 and r6 set the gain for channel 2. the equation for the gain setting is: ? ? ? ? ? ? ? ? ? = i f v r r 12 a where, for channel 1: ? ? ? ? ? ? ? = 2 5 12 1 r r a ch v _ for channel 2: ? ? ? ? ? ? ? = 4 6 12 2 r r a ch v _ for a more detailed description, please refer to the ta2024 data sheet. performing measurements on the EB-TA2024 the ta2024 operates by generating a high frequenc y 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 spectr um in nature and typically varies between 100khz and 1mhz, which is well above the 20hz ? 20khz 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 perform ance 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 us ed. unless the filter has a very sharp roll-off just beyond the audio band or the bandwidth of the meas urement instrument is limited, some of the inaudible noise components introduced by the ta2024 amplifier switching pattern will degrade the measurement. one feature of the ta2024 is that it does not require large multi-pol e filters to achieve excellent performance in listening tests, usually a more cr itical 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-bandwid th measuring equipment), these same filters degrade frequency response. the EB-TA2024 evaluation board has a simple two-pole output filter with excellent performance in listening tests. (see application note 4 for more information on bench testing with tripath class-t amplifiers) emi and shielding the ta2024 evaluation board has perforated holes ar ound the amplifier and associated circuitry so that an emi shield can be soldered directly to the board. due to the spread-spectrum nature of the class-t amplifier (the energy is spread across a wi der spectrum, instead of being concentrated at a single frequency), we have found that specific emi sh ielding is typically not necessary for most applications where the amplifier board is mounted insi de a chassis. however, a shield perimeter is still provided for use in more sensitive applications. (see application note 11 for more information on emi)
tripath technology, inc. - technical information 5 EB-TA2024, 04.02 contact information tripath technology, inc 2560 orchard parkway, san jose, ca 95131 408.750.3000 - p 408.750.3001 - f for more sales information, please visit us @ www.tripath.com/cont_s.htm for more technical information, please visit us @ www.tripath.com/data.htm
ta2024 eval board revision: b bill of materials quantity reference part size 2 c23,c24 capacitor 100pf 805 5 c8,c9,c10,c11,c21 capacitor 1000pf 805 7 c6,c7,c16,c20,c26,c29, c30 capacitor 0.1uf 805 6 c12,c13,c22,c25,c27,c28 capacitor 0.47uf 805 1 c5 capacitor 1uf 3216 1 c17 capacitor 1uf 1206 2 c15,c14 capacitor 2.2uf 3216 2 c18,c19 capacitor 180uf, 25v 105 c panasonic hfq or equiv. 150\300 2 r10,r9 resistor 10, 1/8w 1206 1 r7 resistor 8.2k, 1% 805 2 r6,r5 resistor 20k 805 2 r4,r2 resistor 20k 1206 1 r1 resistor 1meg 805 3 l1,l2,l5 ferrite bead ferrite bead fbm2125 805 4 l6,l7,l8,l9 inductor power inductor 10uh, 2a toko 8rdy or equiv. 200\400 1 u2 class-t amplifier ic ta2024 4 d5,d6,d7,d8 diode mbrs130t3 6 bn1, bn2, bn3, bn4, bn5, bn6 connector pcb mount banana jack 1 j1 connector 0.1" header 2-pin 1 j2 connector 0.1" header 2-pin 2 j3, j4 connector pcb mount rca jack 4 standoffs
1 1 a a tripath technology, inc. 1. ta2024 inputs have a dc bias of 2.5v. if input preamp circuitry is not biased at 0v, c14 and c15 may need to be reversed. ta2024 evaluation board notes: * 2. the mute function can be optionally tied to the fault pin to allow for an automatic reset in the event of an over current fault. 3 sq. in. of 1oz. copper directly u nder ta2024 on solder side of pc board with a 5 x 16 array of 14mil vias. package of ta2024 must be soldered to this area. rca rca jumper jumper h t t p : / / w w w . t r i p a t h . c o m b b 11 monday, january 21, 2002 title size document number rev date: sheet of 12v+ vdd vdd gnd vdd +12v_plane vdd vdd vdd bn2 gnd j1 mute fault + c15 2.2uf c23 100pf c17 1uf c26 0.1uf bn5 out2- c24 100pf c6 0.1uf c7 0.1uf bn6 out2+ c20 0.1uf d7 mbrs130t3 c5 1uf c27 0.47uf bn3 out1+ bn4 out1- c21 1000pf c o p p e r a r e a * u2 ta2024 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 +5gen dcap2 dcap1 v5d agnd1 ref overloadb agnd2 v5a vp1 in1 mute nc vp2 in2 biascap agnd3 sleep fault pgnd2 nc dgnd nc outp2 vdd2 vdd2 outm2 outm1 vdd1 vdd1 outp1 nc vdda nc pgnd1 cpump c28 0.47uf c29 0.1uf overloadb c12 0.47uf d6 mbrs 130t3 c25 0.47uf bn1 12v+ c8 1000pf l7 10uh, 2a l8 10uh, 2a c10 1000pf r10 10, 1/4w j3 in1 l6 10uh, 2a c22 0.47uf d5 mbrs130t3 c13 0.47uf l2 fbm2125 r4 20k c9 1000pf r2 20k l1 fbm2125 c30 0.1uf c16 0.1uf c11 1000pf r6 20k r7 8.2k, 1% l9 10uh, 2a r9 10, 1/4w j4 in2 r5 20k r1 1meg l5 fbm2125 + c14 2.2uf d8 mbrs 130t3 + c18 180uf,25v + c19 180uf,25v j2 gnd sleep
tripath technology eb_ta2024 rev b.pcb drill drawing drill 14+ (x82) drill 65+ (x2) drill 120+ (x6) drill 325 (x6) drill 15+ (x7) drill 30+ (x19) drill 60+ (x66) drill 125 (x4) drill 38+ (x8) drill 35+ (x14)
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