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TS34119 数据表(PDF) 5 Page - Taiwan Semiconductor Company, Ltd

部件名 TS34119
功能描述  Low Power Audio Amplifier
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制造商  TSC [Taiwan Semiconductor Company, Ltd]
网页  http://www.taiwansemi.com
标志 TSC - Taiwan Semiconductor Company, Ltd

TS34119 数据表(HTML) 5 Page - Taiwan Semiconductor Company, Ltd

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TS34119
Low Power Audio Amplifier
5/12
Version: B13
Design Guideline
GENERAL
The TS34119 is a low power audio amplifier capable of low voltage operation (Vcc=2.0V minimum) such as that
encountered in line-powered speakerphones. The circuit provides a differential output (VO1-VO2) to the speaker
to maximize the available voltage swing at low voltages. The different gain is set by two external resistors. Pins
FC1 and FC2 allow controlling the amount of power supply and noise rejection, as well as providing alternate
inputs to the amplifiers. The CD pin permits powering down the IC for muting purposes and to conserve power.
AMPLIFIERS
Referring to the block diagram, the internal configuration consists of two identical operational amplifiers. Amplifier
#1 has an open loop gain of
≥80Db (at f≤100Hz), and the closed loop gain is set by external resistor Rf and Rj.
The amplifier is unity gain stable, and has a unity gain frequency of approximately 1.5MHz. In order to adequately
cover the telephone voice band (300Hz to 3.4kHz), a maximum closed loop gain of 46dB is recommended.
Amplifier #2 is internally set to gain of –1.0 (0dB). The outputs of both amplifiers are capable of souring and
sinking a peak current of 200mA.The outputs can typically swing to within
≈ 0.4V above ground, and to
within
≈1.3V below VCC, at the maximum current. See Figure 18 and 19 for VOH and VOL curves. The output dc
offset voltage (VO1-VO2) is primarily a function of the feedback resistor (Rf), and secondarily due to the
amplifiers’ input offset voltages. The input offset voltage of the two amplifiers will generally be similar for a
particular IC, and therefore nearly cancel each other at the outputs. Amplifier #1’s bias current, however, flows out
of Vin (pin 4) and through Rf, forcing VO1 to shift negative by an amount equal to (Rf
× IIB), Vo2 is shifted posited
an equal amount. The output offset voltage, specified in the Electrical Characteristics is measured with the
feedback the feedback resistor shown in the Typical Application Circuit, and therefore takes into account the bias
current as wells internal offset voltages of the amplifiers. The bias current is constant with respect to VCC.
FC1 AND FC2
Power supply rejection is provided by the capacitors (C1 and C2 in the typical Application Circuit) at FC1 and
FC2. C2 is somewhat dominant at low frequencies, while C1 is dominant at high frequencies, as shown in the
graphs of Figure 4 to 7. The required values of C1 and C2 depend on the conditions of each application. A line
powered speakerphone, for example, will require more filtering than a circuit powered by a well regulated power
supply. The amount of rejection is function of the capacitors, and the equivalent impedance looking into FC1 and
FC2 (listed in the Electrical Characteristics as RFC1 and RFC2). In addition to providing filtering, C1 and C2 also
affect the turn-on time of the circuit at power-up, since the two capacitors must charge up through the internal 50K
and 125K resistors. The graph of Figure 1 indicates the turn-on time upon application of VCC of +6V. The turn-on
time is
≈ 60% longer for VCC =3V, and ≈ 20% less for VCC =9V. Turn-off time is <10uS upon removal of VCC.
CHIP DISABLE
The chip Disable (pin 1) can be used to power down the IC to conserve power, or for muting, or both. When at a
Logic “0” (0V to 0.8V), the TS34119 is enabled for normal operation. When pin 1 is a Logic ”1” (2V to VCC), the IC
is disabled. If pin 1 is open, that is equivalent to Logic “0” although good design proactive dictates that an input
should never be left open. Input impedance at pin 1 is a nominal 90KΩ. The power supply current (when disabled)
is shown in Figure 15. Muting, defined as the change in differential gain from normal operation to muted operation,
is in excess of 70dB. The turn-off time the audio output, from the application of the CD signal, is <2uS, and turn
on-time is 12 mS-15mS. Both times are independent of C1, C2, and VCC. When the TS34119 is disabled, the
voltage at FC1 and FC2 do not change as they are powered from Vcc. The outputs, VO1 and VO2, change to
high impedance condition, removing the signal from the speaker. If signals from other sources are to be applied to
the outputs (while disabled), they must be within the range of VCC and Ground.
LAYOUT CONSIDERATIONS
Normally a snobbier is not needed at the output of the TS34119, unlike many other audio amplifiers, However, the
PC board layout, stray capacitances, and the manner in which the speaker wires are configured, may dictate
otherwise. Generally, the speaker wires should be twisted tightly, and not more than a few inches in length.


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