BA7726AFS ROHM Electronics, BA7726AFS Datasheet - Page 8

• Manufacturer Part Number: BA7726AFS
• Manufacturer: ROHM Electronics

•
(1) MUTE CTRL (pin 4)
(2) OUTPUT CTRL (pins 3, 31, 32)
1) NO / VC CTRL (pin 31)
LEFT
STEREO : LINE IN L / R input is output to LINE OUT L / R without modification
RIGHT
LEFT
VOCAL FADER : Attenuates the vocals from normal stereo recordings.
RIGHT
8
NORMAL
VOCAL CUT : Used to erase or attenuate vocals in
• Controls line muting.
• LINE OUT output is controlled with pins 3, 31 and 32.
• Used to select the NORMAL and VOCAL CUT modes.
2) L / ST / R CTRL (pin 32)
• Controls LINE OUT output in the NORMAL mode.
3) L / VF / R CTRL (pin 3)
• Controls LINE OUT output in the VOCAL CUT mode.
Multimedia ICs
Circuit operation
(Microphone mixing is controlled with pin 11.)
When Vnovc = L, V
When Vnovc = H, V
NORMAL
LEFT
LEFT
MUTE
: LINE IN L input is output to LINE OUT L / R.
: LINE IN R input is output to LINE OUT L / R.
L
L
L
L
: Normal output mode. Controlled by pin 32.
multiplexed karaoke recordings and
normal stereo music recordings.
Controlled by pin3.
: For recordings in which the left channel is karaoke
: For recordings in which the right channel is karaoke
V
V
and the right channel is for vocals (with karaoke).
and the left channel is for vocals (with karaoke).
MUTE
NOVC
LVFR
LSTR
(31pin)
VOCAL FADER
(4pin)
= DON ' T CARE
= DON ' T CARE
V
V
LSTR
M (OPEN)
M (OPEN)
STEREO
VOCAL CUT
LVFR
MUTE
(32pin)
(3pin)
H
H
RIGHT
RIGHT
H
H
(3) ECHO LEVEL CTRL and MIC ON / OFF SW (pin 11)
(4) LOOP GAIN CTRL (pin 12)
MIC ON and ECHO LEVEL CTRL
• Between Vcc and 0.2
• Adjusts the loop gain (pins 17 and 18).
mixing ratio
Between Vcc and GND : Turns microphone input
sound (pin 26) to LINE OUT on and off
Fig. 2 LINE OUTattenuation ratio vs. Vecho (11pin)
– 100
– 25
– 50
Fig. 3 CMP BF OUT attenuation ratio vs. Vloop
– 50
V
0
0
CC
0
0
partial pressure ratio
~ 0.2 V
(pin 12) partial pressure ratio
These figures are for standard samples and
are not guaranteed standards.
These figures are for standard samples and
are not guaranteed standards.
BA7726AS / BA7726AFS
V
V
ECHO
LOOP
CC
V
(11pin) P.P ratio : V
(12pin) P.P ratio : V
ECHO
DLY BF IN
(V
Vcc: Controls echo signal
(11pin)
IN
0.5
0.5
= – 4dBV, f = 1kHz)
MIC AMP IN ~ LINE OUT
DLY BF IN ~ LINE OUT
(V
(V
V
IN
IN
~
CC
0.1 V
= – 38dBV, f = 1kHz)
= – 4dBV, f = 1kHz)
CMP BF OUT
= 9.0V
ECHO
ECHO
MIC OFF
/ V
/ V
CC
CC
CC
~ GND
1.0
1.0