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TPA3118D2 Datasheet(PDF) 14 Page - Texas Instruments

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Part # TPA3118D2
Description  15-W, 30-W, 50-W Filter-Free Class-D Stereo Amplifier Family With AM Avoidance
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TPA3118D2 Datasheet(HTML) 14 Page - Texas Instruments

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i
i
1
f
2 Z C
p
=
ƒ
5
6
7
8
9
10
INNR
PLIMIT
GVDD
GAIN/SLV
GND
2
1
1
2
C5
1 F
µ
2
1
51 k
R1
51 k
R2
14
TPA3116D2, TPA3118D2, TPA3130D2
SLOS708G – APRIL 2012 – REVISED DECEMBER 2017
www.ti.com
Product Folder Links: TPA3116D2 TPA3118D2 TPA3130D2
Submit Documentation Feedback
Copyright © 2012–2017, Texas Instruments Incorporated
Feature Description (continued)
(1)
Resistor tolerance should be 5% or better.
Table 1. Gain and Master/Slave
MASTER / SLAVE
MODE
GAIN
R1 (to GND)(1)
R2 (to GVDD)(1)
INPUT IMPEDANCE
Master
20 dB
5.6 kΩ
OPEN
60 kΩ
Master
26 dB
20 kΩ
100 kΩ
30 kΩ
Master
32 dB
39 kΩ
100 kΩ
15 kΩ
Master
36 dB
47 kΩ
75 kΩ
9 kΩ
Slave
20 dB
51 kΩ
51 kΩ
60 kΩ
Slave
26 dB
75 kΩ
47 kΩ
30 kΩ
Slave
32 dB
100 kΩ
39 kΩ
15 kΩ
Slave
36 dB
100 kΩ
16 kΩ
9 kΩ
Figure 27. Gain, Master/Slave
In Master mode, SYNC terminal is an output, in Slave mode, SYNC terminal is an input for a clock input. TTL
logic levels with compliance to GVDD.
7.3.2 Input Impedance
The TPA31xxD2 family input stage is a fully differential input stage and the input impedance changes with the
gain setting from 9 k
Ω at 36 dB gain to 60 kΩ at 20 dB gain. Table 1 lists the values from min to max gain. The
tolerance of the input resistor value is ±20% so the minimum value will be higher than 7.2 k
Ω. The inputs need to
be AC-coupled to minimize the output dc-offset and ensure correct ramping of the output voltages during power-
ON and power-OFF. The input ac-coupling capacitor together with the input impedance forms a high-pass filter
with the following cut-off frequency:
(1)
If a flat bass response is required down to 20 Hz the recommended cut-off frequency is a tenth of that, 2 Hz.
Table 2 lists the recommended ac-couplings capacitors for each gain step. If a -3 dB is accepted at 20 Hz 10
times lower capacitors can used – for example, a 1 µF can be used.
Table 2. Recommended Input AC-Coupling Capacitors
GAIN
INPUT IMPEDANCE
INPUT CAPACITANCE
HIGH-PASS FILTER
20 dB
60 kΩ
1.5 µF
1.8 Hz
26 dB
30 kΩ
3.3 µF
1.6 Hz
32 dB
15 kΩ
5.6 µF
1.9 Hz
36 dB
9 kΩ
10 µF
1.8 Hz


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