an7198z Panasonic Corporation of North America, an7198z Datasheet - Page 12

• Manufacturer Part Number: an7198z
• Description: Dual 20 W Btl Power Ic For Car Audio
• Manufacturer: Panasonic Corporation of North America

AN7198Z
12
3. Application note (continued)
2) Output line noise countermeasures
3) Input terminal
4) Ripple filter
Technical Information (continued)
(1) In order to increase the oscillation allowance, it is unnecessary
(2) The use of polyester film capacitor having a little fluctuation
(1) The reference voltage of input terminal is 0 V. When the input
(2) 10 k
(3) The output offset voltage fluctuates when the signal source impedance R
(4) If a high frequency signal from tuners enters the input terminal as noise, insert a capacitor of approx. 0.01 F
(1) In order to suppress the fluctuation of supply voltage, connect a capacitor of approx. 33 F between RF
(2) Relation between RR (Ripple Rejection Ratio) and a capacitor.
Input signal
to use a capacitor and a resistor between each output terminal
and GND. However, when inserting the capacitor for counter-
measures against output line noise between the output terminal
and GND, insert a resistor of approx. 2.2
in Figure 2. The oscillation may occur if only capacitor is used.
Use it after giving a sufficient evaluation.
with temperature and frequency is recommended as the
capacitor for countermeasures against output line noise.
signal has a reference voltage other than 0 V potential, connect
a coupling capacitor (of about several F) for DC component
cut in series with the input terminal. Check the low-pass
frequency characteristics to determine the capacitor value.
in the case of using the circuit by directly connecting a volume control to the input terminal. In such a case,
the use of coupling capacitor is recommended.
between the input terminal and input GND.
When a high frequency signal is inputted, malfunction in protective circuits may occur.
terminal (pin 12) and GND.
The larger the capacitance of the ripple filter is, the better the ripple rejection ratio becomes.
(However, there is almost no difference if the capacitance is 10 F or more.)
0.01 F
1 F
or less of signal source impedance R
10 k
11
6
200
30 k
Figure 3
in series as shown
g
600
can reduce the output end noise voltage.
15 A
15 A
ICs for Audio Common Use
Figure 2
Attenuator
g
is changed. A care must be taken
13, 15
3, 14
2, 4
to power
1
2.2
to speaker
0.01 F
to 0.1 F