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BA8400 データシート(PDF) 2 Page - Rohm

部品番号 BA8400
部品情報  CTL recording / playback amplifier for VHS VCRs
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メーカー  ROHM [Rohm]
ホームページ  http://www.rohm.com
Logo ROHM - Rohm

BA8400 データシート(HTML) 2 Page - Rohm

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2
Video ICs
BA8400FV
Pin descriptions
Pin No.
Pin name
Function
1
2
3
4
5
6
7
8
9
10
11
12
13
14
CTL OUT
(CTL pulse output)
RECHPB
(record / play switch)
RECIN
(REC CTL pulse input)
GND
CTL +
(CTL head “+” input)
CTL –
(CTL head “–” input)
RECPBGND
BIAS
(bias)
IN –
(playback amplifier input)
MONIOUT
(playback amplifier output)
AGC
(AGC time constant)
HysBIAS
(hysteresis amplifier
center level)
FILTER
(high-frequency
noise filter)
VCC
CTL pulse output.
High output level approx. VCC – 0.05V, IO = + 0.5mA
Low output level approx. 0.05V, IO = – 0.5mA
Switch input pin for the record / playback amplifiers.
High input: REC mode
Low input: PB mode
Threshold voltage: approx. 1 / 2VCC
CTL pulse input pin for recording.
Threshold voltage: approx. 1 / 2VCC
Power, REC / PB SW, CTL output buffer ground pin.
Ground pin for the REC and playback amplifiers.
Feedback input pin for the playback amplifier.
Playback amplifier output monitor pin.
Output dynamic range is the DC level
± Vf.
Set the time constant after considering the transient response of the playback
mode switching.
AGC detect level VdetAGC = 0.47VCC [V] (approx.)
Playback amplifier output amplitude VAGC = 2
× (VdetAGC – HysVcent) [VP-P]
Connection pin for the bypass capacitor for the hysteresis amplifier center level.
Connect a decoupling capacitor close to the pin.
Pin for connection of high-frequency noise filter for AGC amplifier output for
playback CTL pulse. Also, input pin for the hysteresis amplifier. Hysteresis
amplifier center voltage HysVcent = 0.27Vcc [V] approx.
High-side hysteresis width
∆HysVH = 0.367VCC – HysVcent [V]
Low-side hysteresis width
∆HysVL = 0.173VCC – HysVcent [V]
Bias pin for the playback amplifier.
Bias voltage: VIB8 = 0.15VCC + 1.3V (approx.)
When recording: CTL head positive-side recording current.
When playing: input pin for the playback CTL pulse.
When recording: CTL head negative-side recording current.
When playing: bias pin for the playback CTL pulse input.
Absolute maximum ratings (Ta = 25°C)
Parameter
Symbol
Limits
Unit
Power supply voltage
Power dissipation
Operating temperature
Storage temperature
VCC
Pd
Topr
Tstg
8.0
450
– 25 ~ + 75
– 55 ~ + 125
V
mW
°C
°C
Reduced by 4.5mW for each increase in Ta of 1 °C over 25°C.
Recommended operating conditions (Ta = 25°C)
Parameter
Symbol
Limits
Unit
Applied voltage
VCC
2.7 ~ 3.5
V
Not designed for radiation resistance.


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