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Tr i path Technol ogy, I nc. - Techni cal I nfor m ati on
RB-TA2020-1
6 CHANNEL TA2020 REFERENCE BOARD
CLASS-T DIGITAL AUDIO AMPLIFIER REFERENCE BOARD USING DIGITAL POWER PROCESSINGTM TECHNOLOGY
Technical Information Revision D - 05.01
GENERAL DESCRIPTION The RB-TA2020-1 reference board is based on the TA2020 digital audio power amplifier from Tripath Technology. The board is designed to provide a simple and straightforward environment for the use of the Tripath TA2020. The RBTA2020-1 reference board is a 6 x 20W (4 load) amplifier using three Tripath TA2020-020's. The TA2020-020 provides amplification for two channels of audio and drives a 4 (minimum) passive load (loudspeaker). For more information on the TA2020-020 power amplifier, see the TA2020-020 datasheet (www.tripath.com).
1
RB-TA2020-1 -Rev. D/05.01
Tr i path Technol ogy, I nc. - Techni cal I nfor m ati on
Input Connection
Audio input to the board is provided via a 7-pin header (J1). Connector Pin Out (J1) Pin1 Pin2 Pin3 Pin4 Pin5 Pin6 Pin7 Connector Designation IN1 IN2 IN3 AGND IN4 IN5 IN6 Description Channel 1 Input Channel 2 Input Channel 3 Input Analog Ground Channel 4 Input Channel 5 Input Channel 6 Input
Output Connection
The TA2020 has differential outputs (bridged), therefore, it requires two wires per channel to connect to each speaker, neither of which is ground. Connector J1 J1 J1 J1 J2 J2 J2 J2 J3 J3 J3 J3 Connector Label 1P 1N 2N 2P 3P 3N 4N 4P 5P 5N 6N 6P Description Positive output of Channel 1 Negative output of Channel 1 Negative output of Channel 2 Positive output of Channel 2 Positive output of Channel 3 Negative output of Channel 3 Negative output of Channel 4 Positive output of Channel 4 Positive output of Channel 5 Negative output of Channel 5 Negative output of Channel 6 Positive output of Channel 6
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RB-TA2020-1 -Rev. D/05.01
Tr i path Technol ogy, I nc. - Techni cal I nfor m ati on
Power Connection
The TA2020 requires a +13.5V power supply (14.6V max) to operate. Power to the board is provided via a 2 pin header connector. Connector Label Vs GND Description Positive of the 13.5V Power supply Negative (GND) of 13.5V Power Supply
Warning: Do not exceed Maximum Operating Supply Voltage of 14.6V
Jumper Settings
There is a 3 pin header for the MUTE control for each of the three TA2020 amplifiers to allow for evaluation of each TA2020 on the evaluation board. If the jumper is removed, the associated TA2020 and its two output channels will be muted. When the jumper is placed in the "gnd" position the associated part is un-muted. When the jumper is placed in the "fault" position the associated TA2020 and its two output channels will MUTE when the FAULT pin outputs a logic high indicating an over-current or over-temperature condition. It is recommended that the "fault" position be used during normal operation.
Performing Measurements on the RB-TA2020-1
The TA2020 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 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 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 TA2020 amplifier switching pattern will degrade the measurement by including out of band (audio) energy. One feature of the TA2020 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 RB-TA2020-1 Reference Board has a simple two-pole output filter with excellent performance in listening tests.
(See Application Note 4 for more information on bench testing)
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RB-TA2020-1 -Rev. D/05.01
Tr i path Technol ogy, I nc. - Techni cal I nfor m ati on
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
4
RB-TA2020-1 -Rev. D/05.01
5
4
3
2
1
D
D
amp block 1 in1 J2 in2 AGND OUT2N OUT2P OUT1N 1P 1N 2P 2N OUT1P
Vs PGND
C
C
HDR1 amp block 2 in3 J3 in4 AGND OUT4N OUT4P OUT3N 3P 3N 4P 4N OUT3P
1 2 3 AGND 4 5 6
Vs PGND
B
B
amp block 3 in5 J4 in6 AGND OUT6N OUT6P OUT5N 5P 5N 6P 6N OUT5P
HDR2 Vs PGND
1 2
A
NOTES:
A
Title TA2020 6 CHANNEL REFERENCE DESIGN Size B Date: Document Number Tripath Technology Inc. Monday, April 23, 2001
3 2
1. Ground plane is split into two. Both halves are joined at a point near pin 20 of each TA2020. 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. TA2020 inputs have a DC bias of 2.5V. If input preamp circuitry is NOT biased at 0V, the input coupling capacitor may need to be reversed.
4
Rev 1.0 Sheet
1
1
of
1
5
5
4
3
2
1
U1
D
D
Tripath Technology
TA2020
VCC Vs 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 VCC C5 0.1uF C10 0.1uF + + VCC C6 0.1uF C7 180uF,25V C8 0.1uF C9 180uF,25V C11 1uF + VCC VCC C12 0.1uF AGND 32 NC OVERLOADB AGND2 V5A VP1 IN1 MUTE / IDLE VP2 IN2 BIASCAP NC AGND3 SLEEP FAULT PGND2 DGND OUTP2 VDD2 OUTM2 OUTM1 VDD1 OUTP1 VDDA PGND1 CPUMP +5GEN DCAP2 DCAP1
NC
V5D
AGND1
1
2
3
4
RREF
**
**
PGND
C
C
C3 1uF
+
C4 0.1uF
R5 8.2k, 1%
OVRLDB
L1 Rf 20k D1 1N5817 D2 1N5817 D3 1N5817 D4 1N5817 C13 0.47uF C15 0.47uF C16 R6 10 Rf 20k C14 0.47uF
B
10uH OUT1P
Ri
R3
in1
+
C1
2.2uF
R1
20k L2 10uH
0.1uF
OUT1N
Ri
R4
B
in2
+
C2
2.2uF
R2
20k
L3
10uH OUT2N
AGND MUTE
FAULT
C17 0.47uF
C19 0.47uF C20 0.1uF L4 10uH R7 10 OUT2P C18 0.47uF
A
NOTES:
A
1. Ground plane is split into two. Both halves are joined at a point near pin 20 of each TA2020. 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. TA2020 inputs have a DC bias of 2.5V. If input preamp circuitry is NOT biased at 0V, the input coupling capacitor may need to be reversed.
Title TA2020 6 CHANNEL REFERENCE DESIGN Size B Date:
3 2
** Connect PGND to AGND from PIN 20 to PIN 3 with a single trace.
4
Document Number Tripath Technology Inc. Monday, April 23, 2001 Sheet
1
Rev 1.0 1 of 1
5
5
4
3
2
1
U2
Tripath Technology
D
TA2020
VCC Vs 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 VCC C25 0.1uF C30 0.1uF + VCC C26 0.1uF C27 180uF,25V C28 0.1uF C29 180uF,25V GND_A GND_P + C31 1uF + C32 0.1uF AGND VCC VCC 32 NC OVERLOADB AGND2 V5A VP1 IN1 MUTE / IDLE VP2 IN2 BIASCAP NC AGND3 SLEEP FAULT PGND2 DGND OUTP2 VDD2 OUTM2 OUTM1 VDD1 OUTP1 VDDA PGND1 CPUMP +5GEN DCAP2 DCAP1
D
NC
V5D
AGND1
1
2
3
4
RREF
**
**
PGND
C23 1uF
+
C24 0.1uF
R12 8.2k, 1%
OVRLDB
L5 Rf 20k D5 1N5817 D6 1N5817 D7 1N5817 D8 1N5817 C33 0.47uF C35 0.47uF C36 R13 10 Rf 20k C34 0.47uF L6 10uH OUT3N 0.1uF 10uH OUT3P
C
C
Ri
R10
in3
+
C21
2.2uF
R8
20k
Ri
R11
in4
+
C22
2.2uF
R9
20k
L7
10uH OUT2N
B
B
GND MUTE
FAULT
C37 0.47uF
C39 0.47uF C40 0.1uF L8 10uH R14 10 OUT2P C38 0.47uF
NOTES:
A
1. Ground plane is split into two. Both halves are joined at a point near pin 20 of each TA2020. 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. TA2020 inputs have a DC bias of 2.5V. If input preamp circuitry is NOT biased at 0V, the input coupling capacitor may need to be reversed.
A
** Connect PGND to AGND from PIN 20 to PIN 3 with a single trace.
Title TA2020 6 CHANNEL REFERENCE DESIGN Size B Date: Document Number Tripath Technology Inc. Monday, April 23, 2001
3 2
Rev 1.0 Sheet
1
1
of
1
5
4
5
4
3
2
1
U3
Tripath Technology
D
TA2020
VCC Vs 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 VCC C45 0.1uF C50 0.1uF + VCC C46 0.1uF C47 180uF,25V C48 0.1uF C49 180uF,25V + C51 1uF + C52 0.1uF AGND VCC VCC 32 NC OVERLOADB AGND2 V5A VP1 IN1 MUTE / IDLE VP2 IN2 BIASCAP NC AGND3 SLEEP FAULT PGND2 DGND OUTP2 VDD2 OUTM2 OUTM1 VDD1 OUTP1 VDDA PGND1 CPUMP +5GEN DCAP2 DCAP1
D
NC
V5D
AGND1
1
2
3
4
RREF
**
**
PGND
C43 1uF
+
C44 0.1uF
R19 8.2k, 1%
OVRLDB
L9 Rf 20k D9 1N5817 D10 1N5817 D11 1N5817 D12 1N5817 C53 0.47uF C55 0.47uF C56 R665 R20 Rf 20k C54 0.47uF L10 10uH OUT5N 0.1uF 10uH OUT5P
C
C
Ri
R17
in5
+
C41
2.2uF
R15
20k
Ri
R18
in6
+
C42
2.2uF
R16
20k
L11
10uH OUT6N
B
B
GND MUTE
FAULT
C57 0.47uF
C59 0.47uF C60 0.1uF L12 10uH R21 10 OUT6P C58 0.47uF
NOTES:
A
1. Ground plane is split into two. Both halves are joined at a point near pin 20 of each TA2020. 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. TA2020 inputs have a DC bias of 2.5V. If input preamp circuitry is NOT biased at 0V, the input coupling capacitor may need to be reversed.
Title TA2020 6 CHANNEL REFERENCE DESIGN Size B Date:
4 3 2
A
** Connect PGND to AGND from PIN 20 to PIN 3 with a single trace.
Document Number Tripath Technology Inc. Monday, April 23, 2001 Sheet
1
Rev 1.0 1 of 1
5
TA2020 6 CHANNEL REFERENCE DESIGN REV: D 05/04/2001 Qty. 18 designator C4, C5, C6, C8, C10, C12, C24, C25, C26, C28, C30, C32, C44, C45, C46, C48, C50, C52 C13, C14, C15, C17, C18, C19, C33, C34, C35, C37, C38, C39, C53, C54, C55, C57, C58, C59 C16, C20, C36, C40, C56, C60 C1, C2, C21, C22, C41, C42 C3, C11, C23, C31, C43, C51 C7, C9, C27, C29, C47, C49 R1, R2, R3, R4, R8, R9, R10 R11, R15, R16, R17, R18 R5, R12, R19 R6, R7, R13, R14, R20, R21 D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12 L1, L2, L3, L4, L5, L6, L7, L8 L8, L10, L11, L12 MUTE J1, J2, J3 HDR1 HDR2 U1, U2, U3 NONE description value Ceramic Capacitor (100Mil) .1uF vendor vendor #
18
Stack Metal Film Capacitor .47uF, 50V
Digi-Key
P4671-ND
6 6 6 6 12 3 6 12 12 3 3 1 1 3 4
Stack Metal Film Capacitor .1uF, 50V Electrolytic Capacitor Electrolytic Capacitor Electrolytic Capacitor 1/4W, Thru-Hole Resistor 1/4W, Thru-Hole Resistor 1/4W, Thru-Hole Resistor Schottky Rectifier Diode Fixed Inductor 3 Pin Header 4 Pin Header 7 Pin Header 2 Pin Header TA2020 IC STANDOFF & 4-40 NUT 2.2uF 1uF, 50V 180uF, 25V 20K Ohm
Digi-Key Digi-Key Digi-Key Digi-Key
P4525-ND P6646-ND P5563-ND P5699-ND
8.2K Ohm, 1% 10 Ohm Digi-Key 1N5817 10uH Digi-Key
1N5817DICT-ND TK4467-ND 3-pin 0.1" WM4622-ND WM4205-ND WM4620-ND
100Mil Spacing 156Mil Spacing Digi-Key 100Mil Spacing Digi-Key 156Mil Spacing Digi-Key
9
RB-TA2020-1 - KLI/1.0/05-01, EAD002
10
RB-TA2020-1 - KLI/1.0/05-01, EAD002
11
RB-TA2020-1 - KLI/1.0/05-01, EAD002

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