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Part: EB-TA2020
Category:
Others
Description: Digital Power Processing(tm) Technology Evaluation Platform Using Class-t Digital Audio Amplifier
Company: Tripath
Datasheet: Download EB-TA2020 datasheet File size : 219 kB
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TECHNICAL INFORMATION
Class-T Digital Audio Amplifier Evaluation Board using Digital EB-TA2020 Power ProcessingTM Technology
February 2001, Rev D
General Description
The EB-TA2020 evaluation platform is based on the TA2020-020 digital audio power amplifier from Tripath Technology. This board is designed to provide a simple and straightforward environment for the evaluation of the Tripath TA2020-020. The TA2020-020 provides amplification for two channels of audio and drives 4 and 8 passive loads (loudspeakers). Input, output and power connections are via standard connectors.
Features
Class-T architecture TM Proprietary Digital Power Processing Technology Requires single 13.5V power source Output Power (per channel @ VS = 13.5V) 20W - 4 @ 10% THD+N 12W - 4 @ 0.1% THD+N Easy engineering evaluation platform for Tripath Technology's TA2020-020 product "Audiophile performance" typically: 0.03% THD+N, 4W @ 4 0.08% IHF-IM @ 4
Efficiency - >85% @ full power (RL = 8) Frequency Response: 20 Hz 20 kHz = + 0.5 dB Mute input Turn-on & turn-off pop suppression Short-circuit protection Intelligent over-temperature protection Connects to any passive 4/8 speakers Takes standard audio line output from any sound system Bridged outputs 2-layer low cost board 30-pin Power SOP package
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TECHNICAL INFORMATION
Introduction
The EB-TA2020 was designed the designer with a simple means of evaluating the performance and functionality of the TA2020, 2 x 20W amplifier IC from Tripath Technology. The EB-TA2020 is simple to operate and requires only a few things to get up and running: · Stereo signal source · 13.5V power supply (not to exceed 14.6V) · Two loads (4 ohm minimum) For more information on the TA2020, please refer to the TA2020 datasheet (www.tripath.com)
Mute
In1
VCC
Inputs
In2
Power In
GND
Sleep OUT2P OUT2N OUT1N OUT1P
Output 2
Output 1
EB-TA2020 Board Connection and Operation
Figure 1 shows the connections required for proper operation of the EB-TA2020.
Input Connection
Audio input to the board is provided via two RCA female connectors. Connector Name IN1 IN2 Channel Channel 1 Input Channel 2 Input
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TECHNICAL INFORMATION
Power Connection
The EB-TA2020 requires a +13.5V power supply (14.3V max) to operate. Power to the board is connected via the red and black banana connectors. The positive 13.5V from the power supply is connected to the red banana connector labeled VCC. The ground connection of power attaches to the black banana connector labeled GND.
I n1 L
TA2020
Gnd Mute Fault
Audio Sour ce
+
Sleep
GND OUT2N OUT1N OUT1P OUT2P
G nd
VCC
I n2
13.5V
R
-
-
Speaker Right
Speaker Left
Figure 1
Connector Label VCC GND_P
Description Positive of the 13.5V Power supply Negative (GND) of 13.5V Power Supply
Color Red Black
Warning: Do not exceed Maximum Operating Supply Voltage (Vs) of 14.6V
-
+
+
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TECHNICAL INFORMATION
Output Connection
There are four banana connectors on the evaluation board for speaker output. The TA2020-020 has differential outputs, and so it requires two wires per channel to connect to each speaker. Connector Label OUT1P OUT1N OUT2P OUT2N Description Positive output of Channel 1 Negative output of Channel 1 Positive output of Channel 2 Negative output of channel 2 Color White Blue White Blue
Jumper Setting
There are two jumpers on the board that control the MUTE and SLEEP functions. These jumpers should be in place at all times for normal operation. The MUTE jumper connects the fault output pin to the mute input pin. If the jumper is removed, the part will enter MUTE mode. With the jumper in place, if the part enters an over-current or over-temperature fault condition, the output will be muted. With the SLEEP jumper removed, the TA2020-020 goes into sleep mode when no input signal is present. With the jumper in place, the SLEEP mode is disabled.
Gain Setting
The EB-TA2020 amplifier gain can be adjusted by changing the external resistors R370-R373. R370 and R371 are used to set the gain for channel 1. R372 and R373 are used to set the gain for channel 2. The equation for the gain setting is: R A V = 12 f R i Where, R371 For channel 1: A V _ Ch1 = 12 R370 R372 For channel 2: A V _ Ch2 = 12 R373
For a more detailed description, please refer to the TA2020 data sheet.
Performing Measurements on the EB-TA2020
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.
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TECHNICAL INFORMATION
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. 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 EB-TA2020 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)
CONTACT INFORMATION
For more information on Tripath products, visit our web site at: www.tripath.com TRIPATH TECHNOLOGY, INC. 3900 Freedom Circle, Suite 200 Santa Clara, California 95054 408-567-3000
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