參數(shù)資料
型號(hào)： TS2007IQT
廠商： STMICROELECTRONICS
元件分類： 音頻／視頻放大
英文描述： 2.3 W, 1 CHANNEL, AUDIO AMPLIFIER, DSO8
封裝： 3 X 3 MM, DFN-8
文件頁(yè)數(shù)： 15/29頁(yè)
文件大小： 464K
代理商： TS2007IQT
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 VCC/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 VCC there is an internal 300kΩ 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 VCC/2 for any DC common mode bias input voltage.
Due to the Vic 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 Cin starts to have an
effect. Cin forms, with the input impedance Zin, 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
012dB4
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