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TPF632 Schematic ( Datenblatt PDF ) - 3Peak

Teilenummer TPF632
Beschreibung Audio Line Driver
Hersteller 3Peak
Logo 3Peak Logo 

Gesamt 9 Seiten
		
TPF632 Datasheet, Funktion
3PEAK
Features
TPF632
2-VRMS Audio Line Driver with Integrated Charge Pump
Description
2-VRMS Output into 2.5kΩ Load with 3.3V Supply
Integrated Charge Pump Generates Negative
Supply Rail
0-V DC Voltage at Output
Low Noise: VN = 4.3μVRMS at 20Hz to 20kHz
Low THD+N: 0.001%
Drives 600Ω Load
Stable with 220pF Capacitive Load
Pop-Free Under-Voltage Protection
Pop-Free Enable Control
40°C to 85°C Operation Range
Robust 8kV (Output) HBM ESD Rating
Robust 2kV CDM ESD Rating
Green, TSSOP-14 Package
Applications
Set-Top Box
Blu-ray and HD DVD Players
PDP TV and LCD TV
Home Theater in a Box
The 3PEAK INCORPORATED TPF632 are 2-VRMS
pop-free stereo line drivers with the integrated
charge pump generating the negative supply rail
which allows the removal of the output DC-blocking
capacitors. The devices are capable of driving
2-VRMS into a 2.5-kΩ load with single 3.3V supply
voltage. The device has differential inputs, and can
use external resistors for flexible gain setting.
The TPF632 has built-in enable/shutdown control
for pop-free on/off control. The device has an
external under-voltage detector that mutes the
output when monitored voltage drop below set value.
Using the TPF632 in audio products can reduce
component count considerably compared to
traditional methods of generating a 2-VRMS output.
The device needs only a single 3.3V supply to
generate 5.6-VPP output while a traditional op-amp
requires a split-rail power supply to achieve same.
The device is ideal for single-supply electronics
where size and cost are critical design parameters.
3PEAK and the 3PEAK logo are registered trademarks of
3PEAK INCORPORATED. All other trademarks are the property
of their respective owners.
Audio Line Drivers
Pin Configuration (Top View)
TPF632
14-Pin TSSOP
+INR 1
-INR 2
OUTR 3
GND 4
EN 5
PVSS 6
CN 7
UVP
Charge
Pump
14 +INL
13 -INL
12 OUTL
11 UVP
10 PGND
9 PVDD
8 CP
Part
Number
TPF632
TPF603
TPF605
TPF607
Package
Remarks
TSSOP-14
TSSOP-14
MSOP-10-EP
MSOP-10
3.3V, Differential inputs
5V/3.3V, Differential inputs
5V/3.3V, Single-ended inputs
5V/3.3V, Single-ended inputs,
no UVP control
DAC
DAC
TPF632
LEFT
RIGHT
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Figure 1. Typical Application Circuit of TPF632
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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
6 REV0.0
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