cxa1946aq Sony Electronics, cxa1946aq Datasheet - Page 22

• Manufacturer Part Number: cxa1946aq
• Description: Electronic Volume
• Manufacturer: Sony Electronics

Connections and Characteristics of Each Block
In the Application Circuit, the signal path goes from the input selector to the volume (+loudness) to the tone
control to the fader. The sequence of the blocks in the signal path can be changed because the I/O pins for
each block are independent of each other. For example, it is possible to switch the sequence of the volume
circuit and the tone control so that the signal path goes from the input selector to the tone control to the volume
(+loudness) to the fader. When this connection method is used, the noise voltage in the fader output can be
reduced in actual use because the noise and signal up to the tone control are attenuated by the volume.
However, because the maximum output amplitude of the tone control circuit is limited by the supply voltage,
care should be given to the setting of the input signal level.
Although blocks in the Application Circuit are linked either by coupling capacitors or by direct connection, it is
also possible to insert external circuits between blocks. In this case, the gain will change according to the input
impedance of the following block and the impedance of the external circuit. In addition, the input impedance of
each block can vary by ±20% due to the characteristics of the IC. Consequently, the overall gain also varies.
Give careful consideration to the effects of this variation when setting the constants. The step widths (control
characteristics) of the volume, tone control, and fader are not affected.
Timing Chart
Timer Waiting Period Setting Chart (Vcc = 6 to 12V, operating temperature = –35°C to 85°C)
C = 100pF
C = 0.001µF
C = 0.01µF
C = 0.1µF
C = 1µF
C = 10µF
capacitance C
TIMER pin
DATA
CLK
CE
CE
t
t
t
t
t
t
1
2
ck
su
h
ce
t
300ms
300µs
1
30ms
30µs
3ms
Min.
0.5µs
0.5µs
0.5µs
3µs
1.0µs
0.5µs
4.0µs
D1
Waiting peroid
500ms
500µs
50ms
50µs
Typ.
5ms
5µs
D2
t
ck
900ms
900µs
t
t
(t
90ms
ce
Max.
90µs
L
9ms
9µs
T
is the maximum value for the timer operation time)
– 22 –
t
T
+ 0.5µs
D30
Thi d t
t
su
D31
h
t
h
t h
D32
b
t
2
d f
Invalid
t
L
CXA1946AQ/AR
l d
t h l
t
t th