參數(shù)資料
型號(hào)： TK2019
廠商： Electronic Theatre Controls, Inc.
英文描述： STEREO 20W (4OHM) CLASS-T DIGITAL AUDIO AMPLIFIER
中文描述： 立體聲20瓦（4Ω）類- T的數(shù)字音頻放大器
文件頁(yè)數(shù)： 18/21頁(yè)
文件大?。?/td> 414K
代理商： TK2019
Tripath Technology, Inc. - Technical Information
18
TK2019 – MC/2.1/10-03
OVRLDB
The OVRLDB pin is a 5V logic output that is asserted just at the onset of clipping. When low, it
indicates that the level of the input signal has overloaded the amplifier resulting in increased distortion
at the output. The OVRLDB signal can be used to control a distortion indicator light or LED through a
transistor, as the OVRLDB cannot drive an LED directly. There is a 20K resistor on chip in series with
the OVRLDB output.
Performance Measurements of the TK2019
The TK2019 operates by generating a high frequency switching signal based on the audio input.
This
signal is sent through a low-pass filter (external to the Tripath amplifier) 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 TK2019 amplifier switching pattern will degrade the
measurement.
One feature of the TK2019 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 TK2019 Reference Board uses the Application/Test Circuit of this
data sheet, which has a simple two-pole output filter and excellent performance in listening tests.
Measurements in this data sheet were taken using this same circuit with a limited bandwidth setting in
the measurement instrument.
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