BA3837 Rohm, BA3837 Datasheet

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BA3837

Manufacturer Part Number
BA3837
Description
Vocal fader IC
Manufacturer
Rohm
Datasheet

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Company
Part Number
Manufacturer
Quantity
Price
Company:
Bonase Electronics (HK) Co., Limited Bonase Electronics (HK) Co., Limited
Part Number:
BA3837F-E2
Manufacturer:
Quantity:
518
Price:
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.
Karaoke functions on stereo systems, portable stereos and VCRs
1) Single-chip IC with vocal fader, to erase vocals from
2) Internal secondary active LPF for high degrees of
3) Three control pins for switching between 4 modes:
Power supply voltage
Operating temperature
Storage temperature
Power
dissipation
1 BA3837 and BA3837F
2 BA3838F
Applications
Features
Absolute maximum ratings (Ta = 25°C)
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)
Power supply voltage
Power supply voltage
Power supply voltage
Vocal fader IC
BA3837 / BA3837F / BA3838F
Multimedia ICs
commercially available recordings.
vocal cancellation (high synchronization rejection).
through, vocal fader, sound multiplexing and mute.
Parameter
Parameter
DIP16
SOP16
1
1
2
Symbol
V
V
V
Symbol
CC
CC
CC
Topr
Tstg
V
Pd
CC
Min.
5.4
5.4
4.0
– 55 ~ + 125
– 40 ~ + 85
Typ.
Limits
1000
550
18
2
1
Max.
10
13
15
4) Key controller input and internal switches.
5) Low noise and low distortion.
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).
Unit
Unit
mV
V
V
V
V
C
C
Ta = – 40 C ~ + 85 C
Ta = – 40 C ~ + 60 C
Ta = 25 C
Conditions
1

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BA3837 Summary of contents

Page 1

... 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. ...

Page 2

... Multimedia ICs • Block diagram ROUT – + – + LOGIC SW2 SW1 – – – MIC LOUT FK TK BA3837 / BA3837F / BA3838F LP LP RIN – – – LIN BIAS GND ...

Page 3

... Pin descriptions Pin No. Pin name MIC LOUT BA3837 / BA3837F BA3838F 5 Equivalent circuit 51k 20k 20k 400 BA3837 / BA3837F / BA3838F Function Mixing input pin for microphone sound Lch output pin Input pin for key controller signals Output pin for key controller signals 3 ...

Page 4

... Pin name 6 LIN 7 BIAS 7 8 GND 9 RIN V 10 LPF1 LPF2 4 Equivalent circuit 51k 51k 51k 51k 10.4k 10.4k 10.4k 10.4k 10 BA3837 / BA3837F / BA3838F Function L signal input pin Signal bias circuit pin R signal input pin LPF time constant pin LPF time constant pin ...

Page 5

... Multimedia ICs Pin No. Pin name LPF3 13 ROUT CONTA 15 15 CONTB 16 CONTC Equivalent circuit 20k 20k 20k BA3837 / BA3837F / BA3838F Function LPF output pin R output pin Mode switching pin A Mode switching pin B Mode switching pin C 5 ...

Page 6

... Multimedia ICs • Electrical characteristics BA3837 / F (unless otherwise noted 25°C, Vcc = 10V, f Parameter Symbol Quiescent current I Q Maximum output voltage gain G VT Low frequency gain G VF Microphone gain G VM Crosstalk CT Mute attenuation MU Vocal suppression rate SV Total harmonic distortion THD Noise level ...

Page 7

... Vocal fader mode L L Sound multiplexing (LOUT Through mode KC R Sound multiplexing ( Vocal fader mode KC L Sound multiplexing mode ( BA3837 / BA3837F / BA3838F = 150mV 100 ) IN l Conditions — — — Mode Key controller mode — — — — • • • • ...

Page 8

... Multimedia ICs • Measurement circuit (BA3838F) 4.7V 0.3V A MEASUREMENT 100k V AUDIO ANALYZER Rout LP V MICIN Lout 600 OSC 51k Fig. 1 BA3837 / BA3837F / BA3838F C7 0.047 0. RIN LIN BIAS GND MIC + 10 ...

Page 9

... Multimedia ICs • Application example (BA3838F) POWER AMP – CON 51k 51k 51k + + + 0. – Key con + Fig. 2 BA3837 / BA3837F / BA3838F 10 0.047 + TAPE, CD LD, etc MICROPHONE MICROPHONE 9 ...

Page 10

... Fig. 1. between pins 4 and 5, with pin 5 being positive ( mode: ABC = 111). (7) Connecting a capacitance load to pin 5 (TK) of and C . When 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). 7 (8) The vocal fader works by canceling out the syn- ...

Page 11

... Multimedia ICs 10 1 0.1 0.01 0.001 – 40 – 30 – 20 – INPUT LEVEL : V (dBV) IN Fig. 6 THD vs. V characteristics IN • External dimensions (Units: mm) BA3837 19.4 0 2.54 0.5 0.1 DIP16 10 BA3837F / BA3838F 7. BA3837 / BA3837F / BA3838F 10.0 0 1.27 0.4 0.1 0.3Min. 0.15 SOP16 11 ...

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