參數(shù)資料
型號(hào)： TPA6211A1TDGNRQ1
廠商： TEXAS INSTRUMENTS INC
元件分類： 音頻／視頻放大
英文描述： AUDIO AMPLIFIER, PDSO8
封裝： PLASTIC, MSOP-8
文件頁(yè)數(shù)： 5/22頁(yè)
文件大?。?/td> 424K
代理商： TPA6211A1TDGNRQ1
5 V DC
SBOS555
– JUNE 2011
APPLICATION INFORMATION
mid-supply voltage affects both positive and
negative channels equally, thus canceling at the
FULLY DIFFERENTIAL AMPLIFIER
differential output. Removing the bypass capacitor
The TPA6211A1-Q1 is a fully differential amplifier
slightly worsens power supply rejection ratio
with
differential
inputs
and
outputs.
The
fully
(kSVR), but a slight decrease of kSVR may be
differential amplifier consists of a differential amplifier
acceptable when an additional component can be
and a common- mode amplifier. The differential
eliminated (See Figure 17).
amplifier
ensures
that
the
amplifier
outputs
a
Better RF-immunity: GSM handsets save power
differential voltage that is equal to the differential
by turning on and shutting off the RF transmitter at
input times the gain. The common-mode feedback
a rate of 217 Hz. The transmitted signal is
ensures that the common-mode voltage at the output
picked-up on input and output traces. The fully
is biased around VDD/2 regardless of the common-
differential amplifier cancels the signal much
mode voltage at the input.
better than the typical audio amplifier.
Advantages of Fully Differential Amplifiers
APPLICATION SCHEMATICS
Input coupling capacitors not required: A fully
differential amplifier with good CMRR, like the
28 through
show
application
TPA6211A1-Q1, allows the inputs to be biased at
schematics for differential and single-ended inputs.
voltage other than mid-supply. For example, if a
Typical values are shown in Table 1.
DAC has a lower mid-supply voltage than that of
the TPA6211A1-Q1, the common-mode feedback
Table 1. Typical Component Values
circuit compensates, and the outputs are still
COMPONENT
VALUE
biased
at
the
mid-supply
point
of
the
RI
40 k
TPA6211A1-Q1.
The
inputs
of
the
C(BYPASS)
(1)
0.22
μF
TPA6211A1-Q1 can be biased from 0.5 V to VDD -
0.8 V. If the inputs are biased outside of that
CS
1
μF
range, input coupling capacitors are required.
CI
0.22
μF
Mid-supply bypass capacitor, C(BYPASS), not
required: The fully differential amplifier does not
require a bypass capacitor. Any shift in the
(1)
C(BYPASS) is optional.
Figure 28. Typical Differential Input Application Schematic
Copyright
2011, Texas Instruments Incorporated
13
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