BA7184 Просмотр технического описания (PDF) - ROHM Semiconductor
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BA7184 Datasheet PDF : 8 Pages
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Video ICs
•Control system logic table
(1) DFF IN (pin 16)
• Playback input selection (head switching)
Control pin
Function
DFF IN EP / SP
Selected playback input
L
H
H
Ch3 (PRE IN3 8pin)
Ch4 (PRE IN4 10pin)
L
L
H
Ch1 (PRE IN1 4pin)
Ch2 (PRE IN2 6pin)
Control voltage
VCTRL16 [V]
3.5 ~ VCC
0.0 ~ 1.2
—
—
BA7184S
(2) EP / SP control (pin 2)
• Recording output selection
• Playback input selection (see (1))
Control pin
Function
EP / SP
Selected recording output
H
EP (REC OUT 8, 9, 10pin)
L
SP (REC OUT 4, 5, 6pin)
Control voltage
VCTRL2 [V]
3.5 ~ VCC
0.0 ~ 1.2
(3) TP / PB / EE / REC CTRL (pin 12)
• Special playback / playback / recording mute / recording mode switching
Control pin
PB / EE / REC
Mode
Function
PRE AMP AT ENVE ENV COMP REC MUTE REC AMP
OT
TRICK PLAY
ON
ON
ON
OFF
OFF
H
PB
ON
ON
OFF
OFF
OFF
M
REC MUTE
OFF
OFF
OFF
ON
ON
L
REC
OFF
OFF
OFF
OFF
ON
Control voltage
VCTRL12 [V]
4.1 ~ VCC
3.0 ~ 3.7
1.1 ~ 2.6
0.0 ~ 0.7
• Pin 12 is biased internally in the IC. When open, PB mode is selected.
(4) H SYNC IN (pin 17)
• Special playback envelope comparator (ENVE COMP) output latch control.
• AGC operation control for recording.
Control pin
H SYNC
Function
ENVE COMP AGC detector
Control voltage
VCTRL17 [V]
H
Set at falling edge
ON
2.8 ~ VCC
L
—
OFF
0.0 ~ 1.2
(5) ENVE COMP OUT (pin 15)
• Outputs playback envelope comparator data for special playback.
Control pin
Function
ENVE COMP
Playback input level
H
Ch1 or Ch2 > Ch3 or Ch4
L
Ch1 or Ch2 < Ch3 or Ch4
7
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