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TPA6203A1DRB Datasheet(PDF) 9 Page - Texas Instruments

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No. de pieza TPA6203A1DRB
Descripción Electrónicos  1.25-W MONO FULLY DIFFERENTIAL AUDIO POWER AMPLIFIER
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Fabricante Electrónico  TI [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI - Texas Instruments

TPA6203A1DRB Datasheet(HTML) 9 Page - Texas Instruments

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APPLICATION INFORMATION
Advantages of Fully Differential Amplifiers
APPLICATION SCHEMATICS
_
+
VDD
VO+
VO-
GND
To Battery
Cs
Bias
Circuitry
IN-
IN+
+
-
In From
DAC
SHUTDOWN
RI
RI
C(
)
BYPASS
(Optional)
RF
RF
TPA6203A1
SLOS364E – MARCH 2002 – REVISED DECEMBER 2005
Mid-supply
bypass
capacitor,
C(BYPASS), not
required: The fully differential amplifier does not
FULLY DIFFERENTIAL AMPLIFIER
require a bypass capacitor. This is because any
The TPA6203A1 is a fully differential amplifier with
shift in the mid-supply affects both positive and
differential inputs and outputs. The fully differential
negative channels equally and cancels at the
amplifier consists of a differential amplifier and a
differential output. However, removing the bypass
common- mode amplifier. The differential amplifier
capacitor slightly worsens power supply rejection
ensures that the amplifier outputs a differential
ratio (kSVR), but a slight decrease of kSVR may be
voltage that is equal to the differential input times the
acceptable when an additional component can be
gain. The common-mode feedback ensures that the
eliminated (see Figure 17).
common-mode voltage at the output is biased around
Better RF-immunity: GSM handsets save power
VDD/2 regardless of the common- mode voltage at the
by turning on and shutting off the RF transmitter
input.
at a rate of 217 Hz. The transmitted signal is
picked-up on input and output traces. The fully
differential amplifier cancels the signal much
Input coupling capacitors not required: A fully
better than the typical audio amplifier.
differential amplifier with good CMRR, like the
TPA6203A1, allows the inputs to be biased at
voltage other than mid-supply. For example, if a
Figure
28
through
Figure
30
show
application
DAC has mid-supply lower than the mid-supply of
schematics for differential and single-ended inputs.
the TPA6203A1, the common-mode feedback
Typical values are shown in Table 1.
circuit adjusts for that, and the TPA6203A1
outputs are still biased at mid-supply of the
Table 1. Typical Component Values
TPA6203A1. The inputs of the TPA6203A1 can
be biased from 0.5 V to VDD - 0.8 V. If the inputs
COMPONENT
VALUE
are biased outside of that range, input coupling
RI
10 k
capacitors are required.
RF
10 k
C(BYPASS)(1)
0.22
µF
CS
1
µF
CI
0.22
µF
(1) C(BYPASS) is optional
Figure 28. Typical Differential Input Application Schematic
9


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