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參數(shù)資料
| 型號： | TS2007IQT |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 3W filter-free Class D audio power amplifer with 6-12dB fixed gain select |
| 中文描述： | 3W無濾波器D類音頻放大器6 - 12dB的固定增益選擇 |
| 文件頁數(shù)： | 22/29頁 |
| 文件大?。?/td> | 407K |
| 代理商： | TS2007IQT |
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Application information
TS2007
22/29
4
Application information
4.1
Differential configuration principle
The TS2007 is a monolithic fully-differential input/output class D power amplifier. The
TS2007 also includes a common-mode feedback loop that controls the output bias value to
average it at V
CC
/2 for any DC common mode input voltage. This allows the device to
always have a maximum output voltage swing, and by consequence, maximize the output
power. Moreover, as the load is connected differentially compared to a single-ended
topology, the output 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 zero pop without additional circuitry, giving a faster start-up time compared to
conventional single-ended input amplifiers
Easier interfacing with differential output audio DAC
No input coupling capacitors required thanks to common mode feedback loop
●
●
●
●
●
4.2
Gain settings
In the flat region of the frequency-response curve (no input coupling capacitor or internal
feedback loop + load effect), the differential gain can be set to either 6 or 12 dB depending
on the logic level of the GS pin:
Note:
Between the GS pin and V
CC
there is an internal 300k
Ω
resistor. When the pin is floating the
gain is 6 dB.
4.3
Common mode feedback loop limitations
As explained previously, the common mode feedback loop allows the output DC bias voltage
to be averaged at V
CC
/2 for any DC common mode bias input voltage.
Due to the V
ic
limitation of the input stage (see
Table 2: Operating conditions on page 3
), the
common mode feedback loop can fulfil its role only within the defined range.
4.4
Low frequency response
If a low frequency bandwidth limitation is required, it is possible to use input coupling
capacitors. In the low frequency region, the input coupling capacitor C
in
starts to have an
effect. C
in
forms, with the input impedance Z
in
, a first order high-pass filter with a -3dB cut-
off frequency (see
Table 5
to
Table 9
).
GS
Gain (dB)
Gain (V/V)
1
6dB
2
0
12dB
4
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