RB-TK2051 Ver la hoja de datos (PDF) - Tripath Technology Inc.
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RB-TK2051 Datasheet PDF : 14 Pages
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Tripath Technology, Inc. - Technical Information
JUMPER SETTINGS
There is a 3-pin header for the MUTE (J1) control of the TK2051. With the jumper placed in the G5 position the
part is un-muted. When the jumper is placed in the V5 position the mute pin is pulled high (5V) and the amplifier
is muted. Please refer to the Board Connection Diagram for the connector locations on the RB-TK2051.
INDICATOR LED’S
The RB-TK2051 has an LED labeled HMUTE (D1). The LED will glow red and both outputs are muted when a
fault occurs or the MUTE header is set to V5. Please refer to the TK2051 Data Sheet for a complete description
of HMUTE. Please refer to the Board Connection Diagram for the LED locations on the RB-TK2051.
OUTPUT OFFSET NULL
There are two potentiometers, R16 (Channel 1) and R24 (Channel 2) 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 each channels offsets nulled within +/-10mV.
GAIN SETTING
The gain of the RB-TK2051 Rev 1.3 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 RB-TK2051 Rev 1.4:
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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RB-TK2051, Kli/Rev 1.4/ 04.02
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