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TPA6139A2RGTT датащи(PDF) 11 Page - Texas Instruments

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номер детали TPA6139A2RGTT
подробное описание детали  DirectPath??25-mW Headphone Amplifier With Programmable-Fixed Gain
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TPA6139A2RGTT датащи(HTML) 11 Page - Texas Instruments

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Supply ramp
Supply
MUTE
Time for ac-coupling
capasitors to charge
fc
IN +
1
2p R
IN CIN
C
IN +
1
2p fc
IN RIN
or
TPA6139A2
www.ti.com
SLOS700B – JANUARY 2011 – REVISED JUNE 2012
Input-Blocking Capacitors
DC input-blocking capacitors are required to be added in series with the audio signal into the input pins of the
TPA6139A2. These capacitors block the dc portion of the audio source and allow the TPA6139A2 inputs to be
properly biased to provide maximum performance. The input blocking capacitors also limit the DC gain to 1,
limiting the DC-offset voltage at the output.
These capacitors form a high-pass filter with the input resistor, RIN. The cutoff frequency is calculated using
Equation 1. For this calculation, the capacitance used is the input-blocking capacitor and the resistance is the
input resistor chosen from Table 1. Then the frequency and/or capacitance can be determined when one of the
two values is given.
(1)
For a fixed cutoff frequency of 2Hz the size of the input capacitance is shown in the table below with the
capacitors rounded up to nearest E6 values. For 20Hz cutoff simply divide the capacitor values with 10; e.g., for
1x gain, 150nF is needed.
Table 2. Input Capacitor for Different Gain and Cutoff
Gain_set
Gain
INPUT
2 Hz
GAIN
RESISTOR
(dB)
RESISTANCE
Cutoff
249k
–2.0x
6.0
37k
2.2 µF
82k0
–1.0x
0.0
55k
1.5 µF
49k2
–1.5x
3.5
44k
2.2 µF
35k1
–2.3x
7.2
33k
3.3 µF
27k3
–2.5x
8.0
31k
3.3 µF
20k5
–3.0x
9.5
28k
3.3 µF
15k4
–3.5x
10.9
24k
3.3 µF
11k5
–4.0x
12.0
22k
4.7 µF
9k09
–5.0x
14.0
18k
4.7 µF
7k50
–5.6x
15.0
17k
4.7 µF
6k19
–6.4x
16.1
15k
6.8 µF
5k11
–8.3x
18.4
12k
6.8 µF
3k90
–10x
20.0
10k
10 µF
Pop-Free Power Up
Pop-free power up is ensured by keeping the MUTE low during power supply ramp up and down. The pin should
be kept low until the input AC-coupling capacitors are fully charged before asserting the MUTE pin high to pre-
charge the ac-coupling; and, pop-less power-up is achieved. Figure 10 illustrates the preferred sequence.
Figure 10. Power-Up Sequence
Copyright © 2011–2012, Texas Instruments Incorporated
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