SA58672 NXP Semiconductors, SA58672 Datasheet - Page 15

• Manufacturer Part Number: SA58672
• Manufacturer: NXP Semiconductors

NXP Semiconductors
SA58672_4
Product data sheet
Fig 14. SA58672 evaluation demo board schematic
R3 and R4 are not populated for differential input drive. For single-ended input drive, either R3 or R4 are shorted to ground
using a 0
INM
INP
11.6 Filter-free operation and ferrite bead filters
R4
R3
GND
GND
resistor (i.e., one input is AC grounded and the other is driven with the input signal).
PVDD
1 F
1 F
C3
C2
A ferrite bead low-pass filter can be used to reduce radio frequency emissions in
applications that have circuits sensitive to greater than 1 MHz. A ferrite bead low-pass
filter functions well for amplifiers that must pass FCC unintentional radiation requirements
at greater than 30 MHz. Choose a bead with high-impedance at high frequencies and very
low-impedance at low frequencies. In order to prevent distortion of the output signal,
select a ferrite bead with adequate current rating.
Ferrite bead sources are:
The DC resistance should be as low as possible and the maximum current must exceed at
least 1 A. Impedance of 220
beads may be used. Generally, the current rating decreases with increasing impedance at
100 MHz. However, larger impedance at 100 MHz allows for a smaller, shunt capacitor
that will reduce the quiescent load current; this is important for battery operated
applications.
GND9 GND6 GND
PVDD
•
•
•
GND
SD
TDK MPZ1608S221A: 220
0.04
KOA CZP2AFTTD221P: 220
0.05
Murata BLM21PG221SN1: 220
0.05
SV1
R2
R1
C7
10 F
GND
1
2
3
DC resistance.
DC resistance.
DC resistance.
GND
GND
10 F
C8
C6
1 F
EXT_AVDD
Rev. 04 — 8 June 2009
1
2
3
4
5
SA58672
HVSON10
(3 mm
SD
AVDD
INM
INP
AGND
at 100 MHz is common spec, but 600
3 mm)
at 100 MHz; 3 A peak max current;
1
2
3
SV2
at 100 MHz; 2 A peak max current;
OUTM
PGND
OUTP
PVDD
at 100 MHz; 2 A peak max current;
n.c.
PVDD
AVDD
EXT_AVDD
10
9
8
7
6
GND
C1
3.0 W mono class-D audio amplifier
1 F
2 A - 220
2 A - 220
FB1
FB2
GND
GND
GND
C4
1 nF
C5
1 nF
SA58672
002aad872
© NXP B.V. 2009. All rights reserved.
and 1 k ferrite
OUTP
OUTP
OUTM
OUTM
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