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TPA2036D1 Datasheet(PDF) 10 Page - Texas Instruments

Part No. TPA2036D1
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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TPA2036D1 Datasheet(HTML) 10 Page - Texas Instruments

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Input Resistors I)
Gain +
2 x 150 kW
Decoupling Capacitor S)
Input Capacitors I)
fc +
2p R
I +
2p R
SLOS589 – OCTOBER 2008.............................................................................................................................................................................................. www.ti.com
The input resistors I) set the gain of the amplifier according to Equation 1.
Resistor matching is very important in fully differential amplifiers. The balance of the output on the reference
voltage depends on matched ratios of the resistors. CMRR, PSRR, and cancellation of the second harmonic
distortion diminish if resistor mismatch occurs. Therefore, it is recommended to use 1% tolerance resistors or
better to keep the performance optimized. Matching is more important than overall tolerance. Resistor arrays with
1% matching can be used with a tolerance greater than 1%.
Place the input resistors very close to the input of TPA2036D1 to limit noise injection on the high-impedance
For optimal performance the gain should be set to 2 V/V or lower. Lower gain allows the TPA2036D1 to operate
at its best, and keeps a high voltage at the input making the inputs less susceptible to noise.
The TPA2036D1 is a high-performance class-D audio amplifier that requires adequate power supply decoupling
to ensure the efficiency is high and total harmonic distortion (THD) is low. For higher frequency transients,
spikes, or digital hash on the line, a good low equivalent-series-resistance (ESR) ceramic capacitor, typically 1
µF (X5R or X7R dielectric), placed as close as possible (less than 1 mm) to the device V
DD lead works best.
Placing this decoupling capacitor close to the TPA2036D1 is very important for the efficiency of the class-D
amplifier, because any resistance or inductance in the trace between the device and the capacitor can cause a
loss in efficiency. For filtering lower-frequency noise signals, a 10
µF or greater capacitor placed near the audio
power amplifier would also help, but it is not required in most applications because of the high PSRR of this
The TPA2036D1 does not require input coupling capacitors if the design uses a differential source that is biased
from 0.5 V to VDD –0.8 V (shown in Figure 27). If the input signal is not biased within the recommended
common-mode input range, if needing to use the input as a high pass filter (shown in Figure 28), or if using a
single-ended source (shown in Figure 29), input coupling capacitors are required.
The input capacitors and input resistors form a high-pass filter with the corner frequency, fc, determined in
Equation 2.
The value of the input capacitor is important to consider as it directly affects the bass (low frequency)
performance of the circuit. Speakers in wireless phones cannot usually respond well to low frequencies, so the
corner frequency can be set to block low frequencies in this application.
Equation 3 is reconfigured to solve for the input coupling capacitance.
If the corner frequency is within the audio band, the capacitors should have a tolerance of ±10% or better,
because any mismatch in capacitance causes an impedance mismatch at the corner frequency and below.
For a flat low-frequency response, use large input coupling capacitors (1
µF). In a GSM phone application, there
is a possibility of the 217 Hz "camping" signal being summed into the audio signal. This signal can be minimized
by reducing the RF impedance of the power supply connection through good grounding technique and
decoupling. Keeping the inputs trace length of TPA2036D1 balanced will also minimize the GSM noise both in
the RF and audio domain.
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Copyright © 2008, Texas Instruments Incorporated
Product Folder Link(s): TPA2036D1

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