BA3837F [ROHM]
Vocal fader IC; 声乐推子IC
| 型号： | BA3837F |
| 厂家： | 
ROHM |
| 描述： | Vocal fader IC |
| 文件： | 总11页 (文件大小：139K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Multimedia ICs
Vocal fader IC
BA3837 / BA3837F / BA3838F
The BA3837, BA3837F and BA3838F are ICs with an internal secondary active LPF for vocal cancellation functions
and mixing amplifier functions with high degrees of vocal cancellation. Three control pins are used to switch between
modes: the key controller input mode, through mode, vocal fader mode, sound multiplexing mode and mute mode.
By offering these functions on a single chip, these ICs can significantly reduce the number of external components.
Applications
•
Karaoke functions on stereo systems, portable stereos and VCRs
Features
•
1) Single-chip IC with vocal fader, to erase vocals from
commercially available recordings.
4) Key controller input and internal switches.
5) Low noise and low distortion.
2) Internal secondary active LPF for high degrees of
vocal cancellation (high synchronization rejection).
3) Three control pins for switching between 4 modes:
through, vocal fader, sound multiplexing and mute.
6) Internal microphone mixing amplifier.
7) Available in two packages: DIP 16-pin and SOP 16-
pin (BA3838F is available in SOP 16-pin only).
Absolute maximum ratings (Ta = 25°C)
•
Parameter
Symbol
VCC
Limits
18
Unit
V
Power supply voltage
1
DIP16
1000
Power
dissipation
Pd
mV
2
SOP16
550
Operating temperature
Storage temperature
Topr
Tstg
– 40 ~ + 85
°C
°C
– 55 ~ + 125
1 Reduced by 10 mW for each increase in Ta of 1°C over 25°C.
2 Reduced by 5.5mW for each increase in Ta of 1°C over 25°C.
Recommended operating conditions (Ta = 25°C)
•
Parameter
Symbol
VCC
Min.
5.4
5.4
4.0
Typ.
—
Max.
10
Unit
V
Conditions
Ta = – 40°C ~ + 85°C
1
1
2
Power supply voltage
Power supply voltage
Power supply voltage
VCC
—
13
V
Ta = – 40°C ~ + 60°C
Ta = 25°C
VCC
—
15
V
1 BA3837 and BA3837F
2 BA3838F
1
Multimedia ICs
BA3837 / BA3837F / BA3838F
Block diagram
•
C
B
A
ROUT
13
LP
12
LP
11
LP
10
RIN
9
16
15
14
–
+
– +
–
+
LOGIC
R
L + R
+
–
+
SW2
SW1
– +
L – R
L
+
–
+ –
1
2
3
4
5
6
7
8
VCC
MIC
LOUT
FK
TK
LIN
BIAS
GND
2
Multimedia ICs
BA3837 / BA3837F / BA3838F
Pin descriptions
•
Pin No.
Pin name
Equivalent circuit
Function
1
VCC
1
2
VCC
V
CC
51k
2
Mixing input pin for microphone sound
2
MIC IN
VCC
VCC
20k
20k
3
3
LOUT
Lch output pin
1
2
VCC
V
CC
51k
4
Input pin for key controller signals
4
FK
BA3837 / BA3837F
V
CC
V
CC
5
Output pin for key controller signals
5
TK
BA3838F
VCC
VCC
5
400
3
Multimedia ICs
BA3837 / BA3837F / BA3838F
Pin No.
Pin name
Equivalent circuit
Function
1
2
V
CC
V
CC
51k
6
6
LIN
L signal input pin
VCC
VCC
51k
7
8
9
BIAS
GND
RIN
Signal bias circuit pin
7
51k
1
V
2
V
CC
CC
51k
R signal input pin
9
11
V
CC
10.4k
10.4k
10
LPF1
LPF time constant pin
10
V
CC
10.4k
10.4k
11
11
LPF2
LPF time constant pin
10
4
Multimedia ICs
BA3837 / BA3837F / BA3838F
Pin No.
Pin name
Equivalent circuit
Function
VCC
VCC
VCC
20k
12
12
LPF3
LPF output pin
20k
VCC
VCC
20k
13
14
15
16
ROUT
CONTA
CONTB
CONTC
R output pin
13
V
CC
14
Mode switching pin A
Mode switching pin B
Mode switching pin C
V
CC
15
V
CC
16
5
Multimedia ICs
BA3837 / BA3837F / BA3838F
Electrical characteristics
•
BA3837 / F (unless otherwise noted, Ta = 25°C, Vcc = 10V, fIN = 1kHz, VIN = 150mV, RL = 100kΩ)
Parameter
Symbol
Min.
1.6
2.3
10
10
5
Typ. Max.
Unit
mA
Vrms
dB
Conditions
Quiescent current
I
Q
2.4
2.8
14
14
8
3.3
—
17
17
11
—
—
—
Through mode
THD 1%, through mode
Through mode
fin 50kHz, vocal fader mode
Maximum output voltage
L / R gain
Vom
=
G
G
VT
VF
Low frequency gain
Microphone gain
dB
=
G
VM
dB
—
Crosstalk
CT
MU
SV
54
73
28
—
—
35
4.7
—
—
70
80
33
dB
f
f
IN
IN
=
1kHz
1kHz
Mute attenuation
dB
=
Vocal suppression rate
Total harmonic distortion
Noise level
dB
Vocal fader mode
THD
0.02 0.07
%
Through mode, BW
:
400Hz - 30kHz
V
N
15
50
—
—
7
22
65
—
0.3
26
µVrms
R
g
=
0, DIN AUDIO
Input impedance
RIN
kΩ
LIN, RIN, MICIN, FK
Control pin threshold (high)
Control pin threshold (low)
Output switching DC differential
VthH
VthL
V
V
—
—
∆
DC
mV
Maximum output voltage differential between L, R and TK modes
᭺
Not designed for radiation resistance.
Mode table (A = pin14, B = pin15, C = pin16)
A
0
0
0
0
1
1
1
1
B
0
0
1
1
0
0
1
1
C
0
1
0
1
0
1
0
1
LOUT
MUTE
VF
ROUT
MUTE
VF
TK
Mode
Key controller mode
MUTE
VF
Mute
—
—
—
—
Vocal fader mode
Sound multiplexing mode
Through mode
Mute
L
L
L
L
R
L
MUTE
KC
MUTE
KC
MUTE
VF
•
•
•
•
Vocal fader mode
Sound multiplexing mode
L + R
KC
KC
L
KC
KC
L + R
0
: 0V
VF : vocal fader output
KC : signal passed through key controller
1 : 5V
(1) Microphone output is not muted during muting (ABC = 000 or 100).
(2) Gain and relative phase: See block diagram.
1. L / R input and output in the through mode are synchronous with a gain of 14dB.
2. L / R input and TK output in the key controller mode are synchronous with a gain of 8dB.
3. FK input and L / R output in the key controller mode are synchronous with a gain of 6dB.
4.MIC input and L / R output are negative phase with a gain of 8dB.
6
Multimedia ICs
BA3837 / BA3837F / BA3838F
BA3838F (unless otherwise noted, Ta = 25°C, Vcc = 10V, fIN = 1kHz, VIN = 150mV, Rl = 100Ω)
Parameter
Quiescent current
Symbol
Min.
1.9
2.3
10
10
5
Typ.
2.7
2.8
14
14
8
Max.
3.6
—
17
Unit
mA
Vrms
dB
Conditions
I
Q
Through mode
THD 1%, through mode
Through mode
Maximum output voltage
L / R gain
Vom
=
G
G
VT
VF
Low frequency gain
Microphone gain
17
dB
fin
=
50kHz, vocal fader mode
G
VM
11
dB
—
Crosstalk
CT
SV
54
28
—
—
35
4.7
—
—
70
33
0.02
15
50
—
—
7
—
—
0.07
22
dB
f
IN
=
1kHz
Vocal suppression rate
Total harmonic distortion
Noise level
dB
Vocal fader mode
THD
%
Through mode, BW
:
400Hz - 30kHz
V
N
µ
Vrms
R
g
=
0, DIN AUDIO, through mode
Input impedance
Control pin threshold (high)
Control pin threshold (low)
Output switching DC differential
RIN
65
kΩ
LIN, RIN, MICIN, FK
VthH
VthL
—
0.3
46
V
V
—
—
∆
DC
mV
Maximum output voltage differential between L, R and TK modes
᭺
Not designed for radiation resistance.
Mode table (A = pin14, B = pin15, C = pin16)
A
0
0
0
0
1
1
1
1
B
0
0
1
1
0
0
1
1
C
0
1
0
1
0
1
0
1
LOUT
R
ROUT
R
TK
R
Mode
Key controller mode
Sound multiplexing mode (ROUT)
Vocal fader mode
—
—
—
—
VF
L
VF
L
VF
L
Sound multiplexing (LOUT)
Through mode
L
R
L
KC
KC
KC
KC
KC
KC
KC
KC
R
Sound multiplexing (R)
Vocal fader mode
•
•
•
•
VF
L
Sound multiplexing mode (L)
L + R
L + R
0
: 0V
1 : 5V
VF : vocal fader output
KC : signal passed through key controller
Gain and relative phase: See block diagram.
1. Gain of L / R input and output in the through mode: 14 dB (synchronous)
2. Gain of L / R input and TK output in the key controller mode: 8dB (synchronous)
3. Gain of FK input and L / R output in the key controller mode: 6dB (synchronous)
4. MIC input and L / R output are negative phase with a gain of 8dB.
7
Multimedia ICs
BA3837 / BA3837F / BA3838F
Measurement circuit (BA3838F)
•
4.7V
A
A
A
0.3V
C7
0.22µ
0.047µ
C6
C5
+
10µ
16
C
15
B
14
A
13
12
LP
11
LP
10
LP
9
Rout
RIN
VCC
1
MICIN Lout
FK
4
TK
LIN
6
BIAS
7
GND
8
2
3
5
+
C1
+
+
C3
+
C4
C2
A
10µ
10µ
10µ
22µ
V
+
10µ
MEASUREMENT
100k
L
FK
V
R
MIC
AUDIO
ANALYZER
600Ω
OSC
51k
Fig. 1
8
Multimedia ICs
BA3837 / BA3837F / BA3838F
Application example (BA3838F)
•
µ – CON
51k
51k
51k
10µ
0.047µ
+
+
+
1µ
1µ
1µ
0.22µ
+
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
TAPE, CD
LD, etc.
10µ
+
+
10µ
POWER
AMP
+
22µ
Key – con
MICROPHONE
MICROPHONE
+
Fig. 2
9
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:
(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).
150
fc =
(Hz)
ab
1
2
C7
C6
(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.
The value of Q is: Q =
(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.
(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.
(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.
(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
4
3
5
4
3
40
20
14
0
– 20
– 40
– 60
2
1
2
1
0
2
4
6
8
10 12 14 16 18 20
0
2
4
6
8
10 12 14 16 18 20
10K
100K
10
100
1K
POWER SUPPLY VOLTAGE : VCC (V)
FREQUENCY : f (Hz)
POWER SUPPLY VOLTAGE : VCC (V)
Fig. 4 IQ vs. VCC characteristics
(BA3838F)
Fig. 3 IQ vs. VCC characteristics
(BA3837 / F)
Fig. 5 SV vs. frequency
characteristics
10
Multimedia ICs
BA3837 / BA3837F / BA3838F
10
1
0.1
0.01
0.001
– 40
– 30
– 20
10
– 10
0
INPUT LEVEL : VIN (dBV)
Fig. 6 THD vs.
VIN characteristics
External dimensions (Units: mm)
•
BA3837
BA3837F / BA3838F
10.0 ± 0.2
19.4 ± 0.3
16
1
9
8
16
1
9
8
7.62
1.27 0.4 ± 0.1
0.3Min.
2.54
0.5 ± 0.1
0° ~ 15°
0.15
DIP16
SOP16
11
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