BA3837F データシートの表示（PDF） - ROHM Semiconductor

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BA3837F

Vocal fader IC

ROHM Semiconductor 

Multimedia ICs

BA3837 / BA3837F / BA3838F

•Operation notes

(1) The example in the diagram “Application example”

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.

(2) The low pass filter cutoff frequency is determined

by the internal circuitry and by C6 and C7 in Fig. 1.

With the constant used in Fig. 1, the cutoff fre-

quency (fc) is roughly 150Hz. This cutoff frequen-

cy can be changed by changing C6 and C7. When

C6 is multiple a, and C7 is multiple b, respectively,

the cutoff frequency is calculated thus:

fc

=

150

ab

(Hz)

The value of Q is: Q =

1

2

C7

C6

(Currently, Q Լ 1)

(3) For the gain and relative phase of the input pin

(LIN, RIN, MICIN and FK) inputs and output pin

(LOUT, ROUT and TK) outputs, refer to “Gain and

relative phase,” on page 2 / 10.

(4) Electrical characteristics are measured at a load

resistance (RL) of roughly 100kΩ. As using an

extremely low load resistance (below 10kΩ) 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.

(5) The pin 7 bias voltage is roughly Vcc / 2. Because

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.

(6) When outputting L + R from LOUT and ROUT in

an application in which the key controller is left

unconnected, attach a 10µF electrolytic capacitor

between pins 4 and 5, with pin 5 being positive (L

+ R mode: ABC = 111).

(7) Connecting a capacitance load to pin 5 (TK) of

BA3837 / F can worsen noise characteristics.

When connecting a capacitance load higher than

10µF, insert 1kΩ in series (Figs. 1 and 2). The pin

5 output impedance is roughly 5Ω (1kHz). In the

BA3838F it is roughly 400Ω (1kHz).

(8) The vocal fader works by canceling out the syn-

chronous component of the signal, leaving the low

components in place. Consequently, the vocal

fader may not be very effective with certain

recordings.

(9) In cases where output DC differential can cause

noise when switching between modes, use a time

constant for the timing of control pin switching, or

take some other measure.

(10) Operating supply voltage may vary according to

ambient temperature. Using this IC outside the

recommended supply voltage range may result in

increased crosstalk or mute attenuation.

•Electrical characteristic curves

5

5

40

4

4

20

14

3

3

0

2

2

– 20

1

0 2 4 6 8 10 12 14 16 18 20

POWER SUPPLY VOLTAGE : VCC (V)

Fig. 3 IQ vs. VCC characteristics

(BA3837 / F)

10

1

0 2 4 6 8 10 12 14 16 18 20

POWER SUPPLY VOLTAGE : VCC (V)

Fig. 4 IQ vs. VCC characteristics

(BA3838F)

– 40

– 60

10

100

1K

10K

FREQUENCY : f (Hz)

100K

Fig. 5 SV vs. frequency

characteristics

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