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參數(shù)資料
| 型號： | TS4998IQT |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1 W, 2 CHANNEL, AUDIO AMPLIFIER, QCC16 |
| 封裝： | 4 X 4 MM, ROHS COMPLIANT, QFN-16 |
| 文件頁數(shù)： | 13/33頁 |
| 文件大?。?/td> | 488K |
| 代理商： | TS4998IQT |
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Application information
TS4998
20/33
4
Application information
4.1
General description
The TS4998 integrates two monolithic full-differential input/output power amplifiers with two
selectable standby pins dedicated for each channel. The gain of each channel is set by
external input resistors.
4.2
Differential configuration principle
The TS4998 also includes a common mode feedback loop that controls the output bias
value to average it at VCC/2 for any DC common mode input voltage. This allows maximum
output voltage swing, and therefore, to maximize the output power. Moreover, as the load is
connected differentially instead of single-ended, output power is four times higher for the
same power supply voltage.
The advantages of a full-differential amplifier are:
●
High PSRR (power supply rejection ratio),
●
High common mode noise rejection,
●
Virtually no pops&clicks without additional circuitry, giving a faster startup time
compared to conventional single-ended input amplifiers,
●
Easier interfacing with differential output audio DAC,
●
No input coupling capacitors required due to common mode feedback loop.
In theory, the filtering of the internal bias by an external bypass capacitor is not necessary.
However, to reach maximum performance in all tolerance situations, it is recommended to
keep this option.
The only constraint is that the differential function is directly linked to external resistor
mismatching, therefore you must pay particular attention to this mismatching in order to
obtain the best performance from the amplifier.
4.3
Gain in typical application schematic
A typical differential application is shown in Figure 1 on page 3.
The value of the differential gain of each amplifier is dependent on the values of external
input resistors RIN1 to RIN4 and of integrated feedback resistors with fixed value. In the flat
region of the frequency-response curve (no CIN effect), the differential gain of each channel
is expressed by the relation given in Equation 1.
Equation 1
where RIN = RIN1 = RIN2 = RIN3 = RIN4 expressed in kΩ and Rfeed = 50kΩ (value of internal
feedback resistors).
A
V
diff
V
O+
V
O-
–
Diff
input+
Diff
input-
–
------------------------------------------------------
R
feed
R
IN
--------------
50k
Ω
R
IN
--------------
==
=
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