參數(shù)資料
型號(hào)： TPA6211A1TDGNRQ1
廠商： TEXAS INSTRUMENTS INC
元件分類： 音頻／視頻放大
英文描述： AUDIO AMPLIFIER, PDSO8
封裝： PLASTIC, MSOP-8
文件頁(yè)數(shù)： 7/22頁(yè)
文件大?。?/td> 424K
代理商： TPA6211A1TDGNRQ1
5 V DC
F
C
Gain = RF/RI
fc +
1
2p R
I
C
I
-3 dB
fc
SBOS555
– JUNE 2011
Figure 31. Differential Input Application Schematic With Input Bandpass Filter
Input Capacitor (CI)
Selecting Components
The TPA6211A1-Q1 does not require input coupling
Resistors (RI)
capacitors when driven by a differential input source
biased from 0.5 V to VDD - 0.8 V. Use 1% tolerance
The input resistor (RI) can be selected to set the gain
or better gain-setting resistors if not using input
of the amplifier according to equation 1.
coupling capacitors.
(1)
In the single-ended input application, an input
The internal feedback resistors (RF) are trimmed to
capacitor, CI, is required to allow the amplifier to bias
40 k
.
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 differential
frequency defined in Equation 2.
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
(2)
harmonic distortion diminishes if resistor mismatch
occurs. Therefore, 1%-tolerance resistors or better
are recommended to optimize performance.
Bypass Capacitor (CBYPASS) and Start-Up Time
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 filters any noise
into
this
pin,
increasing
kSVR.
C(BYPASS)also
determines the rise time of VO+ and VO- when the
device exits shutdown. The larger the capacitor, the
slower the rise time.
The value of CI is an important consideration. It
directly affects the bass (low frequency) performance
of the circuit. Consider the example where RI is 10
k
and the specification calls for a flat bass response
down to 100 Hz. Equation 2 is reconfigured as
Copyright
2011, Texas Instruments Incorporated
15
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