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TPA6138A2PW Scheda tecnica(PDF) 10 Page - Texas Instruments

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Il numero della parte TPA6138A2PW
Spiegazioni elettronici  DirectPath Headphone Driver
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Produttore elettronici  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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R1
R2
R3
VSUP_MO
UVP
–IN
Differential Input
Inverting Input
TPA6138A2
R 1
R 1
R 2
R2
+
C 3
C3
R 3
R3
C1
C 1
C 2
R 1
R 2
+
C 3
R 3
C 1
C 2
+IN
–IN
TPA6138A2
TPA6138A2
SLOS704B – JANUARY 2011 – REVISED AUGUST 2015
www.ti.com
Device Functional Modes (continued)
Figure 8. Second-Order Active Low-Pass Filter
The resistor values should have a low value for obtaining low noise, but should also have a high enough value to
allow use of a small-size ac-coupling capacitor. With the proposed values of 15 k
Ω, 30 kΩ, and 43 kΩ, a dynamic
range (DYR) of 106 dB can be achieved with a 1-
μF input ac-coupling capacitor.
9.4.3 TPA6138A2 UVP Operation
The shutdown threshold at the UVP pin is 1.25 V. The customer must use a resistor divider to obtain the
shutdown threshold and hysteresis desired for a particular application. The customer-selected thresholds can be
determined as follows:
VUVP = (1.25 – 6 µA × R3) × (R1 + R2) / R2
(3)
Hysteresis = 5 µA × R3 × (R1 + R2) / R2
(4)
For example, to obtain VUVP = 3.8 V and 1-V hysteresis, we can use R1 = 3 kΩ, R2 = 1 kΩ and R3 = 50 kΩ.
Figure 9. UVP Resistor Divider
10
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