an7191nz Panasonic Corporation of North America, an7191nz Datasheet - Page 12

• Manufacturer Part Number: an7191nz
• Description: Dual 20 W Btl Audio Power Amplifier
• Manufacturer: Panasonic Corporation of North America

AN7191NZ
12
[2] Application note (continued)
3. Input terminal
4. Ripple filter
Technical Information (continued)
1) The reference voltage of input terminal is 0 V. When the input signal has a reference voltage other than 0 V
2) 10 k or less of signal source impedance R
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
3) Relation between the rise time of circuit and a capacitor
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 figure 4 and the charge current is approx. 3 mA to
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 capacitance value.
when using the circuit by directly connecting the volume 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 of protective circuits may occur.
terminal (pin 12) and GND.
The larger the capacitance of a ripple filter is, the better the ripple rejection becomes.
The larger the capacitance of a ripple filter is, the longer the time from the power-on (standby : high) to the
sound release becomes.
10 mA.
Input signal
0.01 F
1 F
4.7 k
11
6
200
30 k
g
can reduce the output noise voltage.
Figure 3
400
15
A
ICs for Audio Common Use
15
g
A
is changed. A care must be taken
Attenuator
To power