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TPA6203A1DGNRG4 데이터시트(PDF) 9 Page - Texas Instruments

부품명 TPA6203A1DGNRG4
상세설명  1.25-W MONO FULLY DIFFERENTIAL AUDIO POWER AMPLIFIER
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제조업체  TI1 [Texas Instruments]
홈페이지  http://www.ti.com
Logo TI1 - Texas Instruments

TPA6203A1DGNRG4 데이터시트(HTML) 9 Page - Texas Instruments

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APPLICATION INFORMATION
FULLY DIFFERENTIAL AMPLIFIER
APPLICATION SCHEMATICS
Advantages of Fully Differential Amplifiers
_
+
VDD
VO+
VO-
GND
ToBattery
Cs
Bias
Circuitry
IN-
IN+
+
-
InFrom
DAC
SHUTDOWN
RI
RI
C(
)
BYPASS
(Optional)
RF
RF
TPA6203A1
www.ti.com.......................................................................................................................................................... SLOS364F – MARCH 2002 – REVISED JUNE 2008
negative channels equally and cancels at the
differential output. However, removing the bypass
capacitor slightly worsens power supply rejection
The TPA6203A1 is a fully differential amplifier with
ratio (kSVR), but a slight decrease of kSVR may be
differential inputs and outputs. The fully differential
acceptable when an additional component can be
amplifier consists of a differential amplifier and a
eliminated (see Figure 17).
common- mode amplifier. The differential amplifier
• Better RF-immunity: GSM handsets save power
ensures that the amplifier outputs a differential
by turning on and shutting off the RF transmitter at
voltage that is equal to the differential input times the
a rate of 217 Hz. The transmitted signal is
gain. The common-mode feedback ensures that the
picked-up on input and output traces. The fully
common-mode voltage at the output is biased around
differential amplifier cancels the signal much
VDD/2 regardless of the common- mode voltage at the
better than the typical audio amplifier.
input.
• Input coupling capacitors not required: A fully
Figure
28
through
Figure
30
show
application
differential amplifier with good CMRR, like the
schematics for differential and single-ended inputs.
TPA6203A1, allows the inputs to be biased at
Typical values are shown in Table 1.
voltage other than mid-supply. For example, if a
DAC has mid-supply lower than the mid-supply of
Table 1. Typical Component Values
the TPA6203A1, the common-mode feedback
COMPONENT
VALUE
circuit adjusts for that, and the TPA6203A1
RI
10 k
outputs are still biased at mid-supply of the
RF
10 k
TPA6203A1. The inputs of the TPA6203A1 can
be biased from 0.5 V to VDD - 0.8 V. If the inputs
C(BYPASS)
(1)
0.22
µF
are biased outside of that range, input coupling
CS
1
µF
capacitors are required.
CI
0.22
µF
• Mid-supply bypass capacitor, C
(BYPASS),
not
(1) C(BYPASS) is optional
required: The fully differential amplifier does not
require a bypass capacitor. This is because any
shift in the mid-supply affects both positive and
Figure 28. Typical Differential Input Application Schematic
Copyright © 2002–2008, Texas Instruments Incorporated
Submit Documentation Feedback
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Product Folder Link(s): TPA6203A1


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