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TPF632 Datasheet Detailansicht - 3Peak

Teilenummer TPF632 Schematic
Beschreibung Audio Line Driver
Hersteller 3Peak
Logo 3Peak Logo 
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TPF632 Datenblatt PDF

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TPF632 Datasheet, Funktion
TPF632
2-VRMS Audio Line Driver with Integrated Charge Pump
-VIN
CIN RIN
RFB
(a)
VOUT
-VIN
+VIN
CIN RIN
RFB
CIN RIN
(b)
RFB
VOUT
Figure 3 Typical Application Circuit of TPF632
AC-Coupling Input Capacitors
Because of the integrated charge pump that generates negative rail, TP632 may be used to amplify audio signal so the
output DC voltage is 0V. This usually requires the DC voltage of the input signal to be 0V. If the input signal has a DC
level other than 0V, an AC-coupling capacitor is necessary to block the DC voltage.
The AC-coupling capacitor essentially forms a high-pass filter at the input. The cut-off frequency of the filter has to be
low enough not to distort the input audio signal. For an inverting amplifier shown in Figure 4 the cut-off frequency may
be calculated as following:
fc
=
2
1
RINCIN
(1)
If the required maximum cut-off frequency is known, the minimum AC-coupling capacitance can be determined:
CIN
1
2RINfc
(2)
Adding Low-Pass Filtering to the Gain
If low-pass filtering is necessary in addition to the audio signal amplification, a second-order filter can be implemented
as shown in Figure 4. Choice of C3, R1, R2, and R3 is based on the gain setting requirement and AC-coupling cut-off
frequency as discussed above. C1, C2 and C4 may be calculated depending on the bandwidth. Example choices of R
and C are listed in Table 1. If first-order filtering satisfies performance requirements, simply remove the C2 and C4 to
lower the component counts.
R3 R3
-VIN
R1
C3 C2
R2
C1
VOUT
-VIN
+VIN
C3 R1
C3 R1
R2
C4
R2
C1
C1
VOUT
R3
(a) (b)
Figure 4 Second-order filter with gain: (a) Single-ended input; (b) Differential input
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