CXA1946BQ/BR
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
CE
DATA
CLK
D1
D2
tck
D30
D31
D32
Invalid
t1
tsu
th
t2
tL
tL ≥ tT + 0.5µs
(tT is the maximum value for the timer operation time)
t1 ≥ 0.5µs
t2 ≥ 0.5µs
tck ≥ 1.0µs
tsu ≥ 0.5µs
th ≥ 0.5µs
CE
tce
tce ≥ 4.0µs
Timer Waiting Period Setting Chart (Vcc = 6 to 12V, operating temperature = –35 to +85°C)
Waiting peroid
TIMER pin
capacitance C
Min.
3µs
Typ.
5µs
Max.
9µs
C = 100pF
C = 0.001µF
C = 0.01µF
C = 0.1µF
C = 1µF
30µs
300µs
3ms
50µs
500µs
5ms
90µs
900µs
9ms
30ms
300ms
50ms
500ms
90ms
900ms
C = 10µF
– 22 –
SONY [ SONY CORPORATION ]
