ba3837f ROHM Co. Ltd., ba3837f Datasheet - Page 10

• Manufacturer Part Number: ba3837f
• Description: Vocal Fader Ic
• Manufacturer: ROHM Co. Ltd.

•
(1) The example in the diagram “Application example”
(2) The low pass filter cutoff frequency is determined
(3) For the gain and relative phase of the input pin
(4) Electrical characteristics are measured at a load
•
10
Multimedia ICs
Operation notes
Electrical characteristic curves
4
5
3
2
1
is recommended with confidence. However, be
sure to comply with these precautions and verify
characteristics during actual use. Also, when
changing an attached circuit constant, be sure to
allow sufficient margins by taking into account both
static and transient characteristics, including varia-
tion in these ICs and the attached components.
by the internal circuitry and by C
With the constant used in Fig. 1, the cutoff fre-
quency (fc) is roughly 150Hz. This cutoff frequen-
cy can be changed by changing C
C
the cutoff frequency is calculated thus:
(LIN, RIN, MICIN and FK) inputs and output pin
(LOUT, ROUT and TK) outputs, refer to “Gain and
relative phase,” on page 2 / 10.
resistance (R
extremely low load resistance (below 10k ) will
result in slight variation in maximum output voltage
and total harmonic distortion, caution must be
used when designing connections with the subse-
quent stage.
The value of Q is: Q =
(Currently, Q
fc =
0
6
POWER SUPPLY VOLTAGE : V
Fig. 3 I
is multiple a, and C
2
150
ab
4
(Hz)
(BA3837 / F)
6
Q
vs. V
8
L
10 12 14 16 18 20
) of roughly 100k . As using an
CC
1)
characteristics
7
1
2
is multiple b, respectively,
CC
(V)
C
C
7
6
6
and C
6
and C
4
5
3
2
1
0
7
Fig. 4 I
POWER SUPPLY VOLTAGE : V
in Fig. 1.
2
7
. When
4
(BA3838F)
Q
6
vs. V
8
CC
10 12 14 16 18 20
characteristics
(5) The pin 7 bias voltage is roughly Vcc / 2. Because
(6) When outputting L + R from LOUT and ROUT in
(7) Connecting a capacitance load to pin 5 (TK) of
(8) The vocal fader works by canceling out the syn-
(9) In cases where output DC differential can cause
(10) Operating supply voltage may vary according to
this is also the input and output pin voltage, select
coupling capacitor polarity according to relative
potential and the characteristics of the compo-
nents to which the coupling capacitor is to be con-
nected.
an application in which the key controller is left
unconnected, attach a 10 F electrolytic capacitor
between pins 4 and 5, with pin 5 being positive (L
+ R mode: ABC = 111).
BA3837 / F can worsen noise characteristics.
When connecting a capacitance load higher than
10 F, insert 1k
5 output impedance is roughly 5
BA3838F it is roughly 400 (1kHz).
chronous component of the signal, leaving the low
components in place. Consequently, the vocal
fader may not be very effective with certain
recordings.
noise when switching between modes, use a time
constant for the timing of control pin switching, or
take some other measure.
ambient temperature. Using this IC outside the
recommended supply voltage range may result in
increased crosstalk or mute attenuation.
CC
(V)
BA3837 / BA3837F / BA3838F
– 20
– 40
– 60
40
14
20
0
10
in series (Figs. 1 and 2). The pin
Fig. 5 SV vs. frequency
100
FREQUENCY : f (Hz)
characteristics
1K
(1kHz). In the
10K
100K