AN7198Z 데이터 시트보기 (PDF) - Panasonic Corporation
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AN7198Z Datasheet PDF : 20 Pages
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ICs for Audio Common Use
AN7198Z
s Technical Information (continued)
3. Application note (continued)
4) Ripple filter (continued)
(3) Relation between the rise time of circuit and a capacitor.
The larger the capacitance of the ripple filter is, the longer
the time from the power on (STB-high) to the sound
release becomes.
1000
(4) The DC voltage of output terminal is approximately the
middle point of the ripple filter terminal voltage.
(5) The internal circuit of ripple filter terminal is as shown in
100
Figure 5 and the charge current is approx. 3 mA to 10 mA.
(6) After the power supply is turned off (STB-low), it takes
10 seconds or less for the total circuit current to become the
10
standby current (under 10 µA). If approx. 47 kΩ resistor
is inserted between the ripple filter terminal and GND for
the purpose of reducing the inspection time with set, a time
until the current becomes the standby current can be shortened.
60
STB-off Time
50
STB-on Time
40
1.0
10
100
RF capacitor value (µF)
Figure 4
15 kΩ
12
33 µF
350 µA
VCC
Constant
current
source
Protection
circuit
10 kΩ
10 kΩ
1.7 mA
VREF
4 kΩ
Figure 5
5) GND terminal
(1) Be sure to short-circuit each GND terminal of
pin 3, 8, 9 and 14 at a point outside the IC in
use.
AN7198Z/99Z
(2) For each GND terminal, the one-point earth,
referenced to the GND connection point of
1
electrolytic capacitor between the supply
terminal and GND, is most effective for
reducing the distortion. Even in the worst
case, ground pin 8, 9 of input GND separately
from all the other GND terminals.
3
8
9
14
Figure 6
to GND of input
(3) Each GND terminal is not electrically short-circuited inside. Only pin 8 is connected with the substrate.
(4) Pin 9 is input signal GND. Connect only pin 9 with GND of the input.
13
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