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TPA6205A1DRBRG4 Fiches technique(PDF) 9 Page - Texas Instruments

No de pièce TPA6205A1DRBRG4
Description  1.25-W MONO FULLY DIFFERENTIAL AUDIO POWER AMPLIFIER WITH 1.8-V INPUT LOGIC THRESHOLDS
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

TPA6205A1DRBRG4 Fiches technique(HTML) 9 Page - Texas Instruments

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APPLICATION INFORMATION
Advantages of Fully Differential Amplifiers
APPLICATION SCHEMATICS
_
+
VDD
VO+
VO-
GND
ToBattery
Cs
Bias
Circuitry
IN-
IN+
+
-
InFrom
DAC
SHUTDOWN
RI
RI
C(
)
BYPASS
(Optional)
RF
RF
TPA6205A1
SLOS490A – JULY 2006 – REVISED AUGUST 2006
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 TPA6205A1 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
common- mode amplifier. The differential amplifier
bypass capacitor slightly worsens power supply
ensures that the amplifier outputs a differential
rejection ratio (kSVR), but a slight decrease of
voltage that is equal to the differential input times the
kSVR may be acceptable when an additional
gain. The common-mode feedback ensures that the
component can be eliminated (see Figure 17).
common-mode voltage at the output is biased
Better RF-immunity: GSM handsets save power
around VDD/2 regardless of the common- mode
by turning on and shutting off the RF transmitter
voltage at the 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
TPA6205A1, allows the inputs to be biased at
voltage other than mid-supply. For example, if a
Figure 27 through Figure 31 show application
DAC has mid-supply lower than the mid-supply
schematics for differential and single-ended inputs.
of the TPA6205A1, the common-mode feedback
Typical values are shown in Table 1.
circuit adjusts for that, and the TPA6205A1
outputs are still biased at mid-supply of the
Table 1. Typical Component Values
TPA6205A1. The inputs of the TPA6205A1 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 27. Typical Differential Input Application Schematic
9
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