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TPA6203A1DGNRG4 датащи(PDF) 10 Page - Texas Instruments

номер детали TPA6203A1DGNRG4
подробное описание детали  1.25-W MONO FULLY DIFFERENTIAL AUDIO POWER AMPLIFIER
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
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TPA6203A1DGNRG4 датащи(HTML) 10 Page - Texas Instruments

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_
+
VDD
VO+
VO-
GND
To Battery
Cs
Bias
Circuitry
IN-
IN+
+
-
IN
SHUTDOWN
RI
RI
RF
RF
CI
CI
C(
)
BYPASS
(Optional)
_
+
VDD
VO+
VO-
GND
To Battery
Cs
Bias
Circuitry
IN-
IN+
IN
SHUTDOWN
RI
RF
CI
CI
RI
RF
C(
)
BYPASS
(Optional)
Bypass Capacitor (CBYPASS) and Start-Up Time
Selecting Components
Resistors (RF and RI)
Gain = RF/RI
(1)
TPA6203A1
SLOS364E – MARCH 2002 – REVISED DECEMBER 2005
Figure 29. Differential Input Application Schematic Optimized With Input Capacitors
Figure 30. Single-Ended Input Application Schematic
The internal voltage divider at the BYPASS pin of this
device
sets
a
mid-supply
voltage
for
internal
references and sets the output common mode
The input (RI) and feedback resistors (RF) set the
voltage to VDD/2. Adding a capacitor to this pin filters
gain of the amplifier according to Equation 1.
any noise into this pin and increases the kSVR.
C(BYPASS)also determines the rise time of VO+ and VO-
when the device is taken out of shutdown. The larger
RF and RI should range from 1 kΩ to 100 kΩ. Most
the capacitor, the slower the rise time. Although the
graphs were taken with RF = RI = 20 kΩ.
output rise time depends on the bypass capacitor
Resistor matching is very important in fully differential
value, the device passes audio 4
µs after taken out of
amplifiers. The balance of the output on the reference
shutdown and the gain is slowly ramped up based on
voltage depends on matched ratios of the resistors.
C(BYPASS).
CMRR, PSRR, and the cancellation of the second
To minimize pops and clicks, design the circuit so the
harmonic distortion diminishes if resistor mismatch
impedance (resistance and capacitance) detected by
occurs. Therefore, it is recommended to use 1%
both inputs, IN+ and IN-, is equal.
tolerance resistors or better to keep the performance
optimized.
10


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