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參數(shù)資料
| 型號： | RB-TK2051 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | 運動控制電子 |
| 英文描述： | CLASS-T DIGITAL AUDIO AMPLIFIER 6 CHANNEL TK2051 REFERENCE BOARD |
| 中文描述： | 類- T的數(shù)字音頻放大器6頻道TK2051的參考電路板 |
| 文件頁數(shù)： | 4/14頁 |
| 文件大?。?/td> | 594K |
| 代理商： | RB-TK2051 |
Tripath Technology, Inc. - Technical Information
4
RB-TK2051 – Rev. 1.0/06.02
JUMPER SETTINGS
There is a 3-pin header for the MUTE control of the TK2051. With the jumper placed in the G5 position the
system is un-muted. When the jumper is placed in the V5 position the mute pin is pulled high (5V) and the
amplifiers are muted. Please refer to the Board Connection Diagram for the connector locations on the
RB-TK2051.
OUTPUT OFFSET NULL
There are six potentiometers that are used to manually trim the output offset to 0Vdc. Please refer to the
Board Connection Diagram for the potentiometer locations on the RB-TK2051. The Evaluation board is
shipped with the offsets nulled within +/-10mV.
GAIN SETTING
The gain of the RB-TK2051 Rev 2.2 is set to 15V/V. The gain of the TK2051 is the product of the TC2000
(control stage) gain and the TP2051 (power stage) gain. The control stage gain is set to unity. Before
changing the gain of the RB-TK2051, please refer to the Amplifier Gain section of the TK2051 Data Sheet.
Performing Measurements on the EB-TK2051 Rev 1.3:
The TK2051 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 TK2051 amplifier switching pattern will degrade the measurement by
including out of band (audio) energy.
One feature of the TK2051 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-TK2051 has a simple two-pole output filter with excellent performance in listening
tests.
(See Application Note 4 for additional information on bench testing)
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