BA8400 Ver la hoja de datos (PDF) - ROHM Semiconductor

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Fabricante

BA8400

CTL recording / playback amplifier for VHS VCRs

ROHM Semiconductor 

Video ICs

BA8400FV

•Pin descriptions

Pin No.

Pin name

Function

1

CTL OUT

(CTL pulse output)

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.

2

RECHPB

(record / play switch)

High input: REC mode

Low input: PB mode

Threshold voltage: approx. 1 / 2VCC

RECIN

CTL pulse input pin for recording.

3

(REC CTL pulse input) Threshold voltage: approx. 1 / 2VCC

4

GND

Power, REC / PB SW, CTL output buffer ground pin.

5

CTL +

(CTL head “+” input)

When recording: CTL head positive-side recording current.

When playing: input pin for the playback CTL pulse.

6

CTL –

(CTL head “–” input)

When recording: CTL head negative-side recording current.

When playing: bias pin for the playback CTL pulse input.

7

RECPBGND

Ground pin for the REC and playback amplifiers.

8

BIAS

(bias)

Bias pin for the playback amplifier.

Bias voltage: VIB8 = 0.15VCC + 1.3V (approx.)

9

IN –

(playback amplifier input) Feedback input pin for the playback amplifier.

10

MONIOUT

Playback amplifier output monitor pin.

(playback amplifier output) Output dynamic range is the DC level ± Vf.

Set the time constant after considering the transient response of the playback

11

AGC

(AGC time constant)

mode switching.

AGC detect level VdetAGC = 0.47VCC [V] (approx.)

Playback amplifier output amplitude VAGC = 2 × (VdetAGC – HysVcent) [VP-P]

HysBIAS

12

(hysteresis amplifier Connection pin for the bypass capacitor for the hysteresis amplifier center level.

center level)

Pin for connection of high-frequency noise filter for AGC amplifier output for

FILTER

playback CTL pulse. Also, input pin for the hysteresis amplifier. Hysteresis

13

(high-frequency

amplifier center voltage HysVcent = 0.27Vcc [V] approx.

noise filter)

High-side hysteresis width ∆HysVH = 0.367VCC – HysVcent [V]

Low-side hysteresis width ∆HysVL = 0.173VCC – HysVcent [V]

14

VCC

Connect a decoupling capacitor close to the pin.

•Absolute maximum ratings (Ta = 25°C)

Parameter

Symbol

Limits

Unit

Power supply voltage

VCC

Power dissipation

Pd

8.0

V

450∗

mW

Operating temperature

Topr

– 25 ~ + 75

°C

Storage temperature

Tstg

– 55 ~ + 125

°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.

2

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