BH7775K データシートの表示（PDF） - ROHM Semiconductor

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BH7775K

VCR audio signal processing system

ROHM Semiconductor 

Video ICs

BH7775K

Parameter

Symbol Min. Typ. Max. Unit

[DO detect circuit]

DO detector level

VDDO

77.0 83.0 89.0 dBµ

[FNORM to Hi-Fi return delay circuit]

Return delay time

τFNDLY

110

125

140

ms

[Envelope output circuit] (INPUT: FM PB IN, OUTPUT: ENVE OUT)

0dB = 660mVP-P, 1.3MHz & 1.7MHz MIX IN

Envelope output level SP0 VENVSP0

—

0

100

mV

Envelope output level SP1 VENVSP1 2.22 2.72 3.22

V

Envelope output level SP2 VENVSP2 3.70 3.95 4.20

V

Envelope output level EP1 VENVEP1 2.18 2.68 3.18

V

Hi-Fi DET output DC FNORMAL VHDETL

—

0

100

mV

Hi-Fi DET output DC HiFi VHDETH

3.50

4.00

—

V

[Hold pulse circuit]

Audio head switch pulse

threshold voltage

VTHHOLD

1.66

2.66

3.66

V

Hold pulse width

∆τHOLD

6.47

7.77

9.07

µs

[Voltage for preserving the control system mode]

〈CLOCK IN〉

L mode holding voltage

VH8L

0.0

—

0.5

V

H mode holding voltage

VH8H

2.5

—

VCC

V

〈DATA IN〉

L mode holding voltage

VH7L

0.0

—

0.5

V

H mode holding voltage

VH7H

2.5

—

VCC

V

MUTE CTRL

MUTE holding voltage

VH22L

0.0

—

1.0

V

DC MUTE holding voltage VH22H

3.9

—

VCC

V

Conditions

Input level to give DO due to attenuation.

FM PB IN (1.3MHz, 1.7MHz, 1: 1 MIX)

time from 660mVP-P input to ENVE OUT

rise. Audio head pulse in: f = 30Hz,

5VP-P rectangular waveform.

No signal, SP MODE

VIN = 0dB, SP MODE

VIN = + 10dB, SP MODE

VIN = – 4dB, EP MODE

No signal

VIN = 0dB

Hysteresis (0.5V)

14

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