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TPA6205A1DRBT Datasheet(PDF) 11 Page - Texas Instruments

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No. de pieza TPA6205A1DRBT
Descripción Electrónicos  1.25-W MONO FULLY DIFFERENTIAL AUDIO POWER AMPLIFIER WITH 1.8-V INPUT LOGIC THRESHOLDS
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Fabricante Electrónico  TI [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI - Texas Instruments

TPA6205A1DRBT Datasheet(HTML) 11 Page - Texas Instruments

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_
+
VDD
VO+
VO-
GND
ToBattery
Cs
Bias
Circuitry
IN-
IN+
SHUTDOWN
RI1
RF
CI1
CP
RP
RF
C(
)
BYPASS
(Optional)
CI2 R
I2
SingleEnded
Input1
SingleEnded
Input2
Input Capacitor (CI)
SELECTING COMPONENTS
Resistors (RF and RI)
Gain − RF/RI
(1)
fc +
1
2pR
I
C
I
(2)
Bypass Capacitor (CBYPASS) and Start-Up Time
–3 dB
fc
C
I +
1
2pR
I
fc
(3)
TPA6205A1
SLOS490A – JULY 2006 – REVISED AUGUST 2006
Figure 31. Application Schematic With TPA6205A1 Summing Two Single-Ended Inputs
The TPA6205A1 does not require input coupling
capacitors if using a differential input source that is
biased from 0.5 V to VDD - 0.8 V. Use 1% tolerance
The input (RI) and feedback resistors (RF) set the
or better gain-setting resistors if not using input
gain of the amplifier according to Equation 1.
coupling capacitors.
In the single-ended
input
application
an
input
RF and RI should range from 1 kΩ to 100 kΩ. Most
capacitor, CI, is required to allow the amplifier to bias
graphs were taken with RF = RI = 20 kΩ.
the input signal to the proper dc level. In this case, CI
and RI form a high-pass filter with the corner
Resistor
matching
is
very
important
in
fully
frequency determined in Equation 2.
differential amplifiers. The balance of the output on
the reference voltage depends on matched ratios of
the resistors. CMRR, PSRR, and the cancellation of
the second harmonic distortion diminishes if resistor
mismatch occurs. Therefore, it is recommended to
use 1% tolerance resistors or better to keep the
performance optimized.
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
voltage to VDD/2. Adding a capacitor to this pin filters
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
The value of CI is important to consider as it directly
the capacitor, the slower the rise time. Although the
affects the bass (low frequency) performance of the
output rise time depends on the bypass capacitor
circuit. Consider the example where RI is 10 kΩ and
value, the device passes audio 4
µs after taken out
the specification calls for a flat bass response down
of shutdown and the gain is slowly ramped up based
to 100 Hz. Equation 2 is reconfigured as Equation 3.
on C(BYPASS).
To minimize pops and clicks, design the circuit so
the
impedance
(resistance
and
capacitance)
detected by both inputs, IN+ and IN-, is equal.
In this example, CI is 0.16 µF, so one would likely
choose a value in the range of 0.22
µF to 0.47 µF. A
further consideration for this capacitor is the leakage
path from the input source through the input network
(RI, CI) and the feedback resistor (RF) to the load.
11
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