BA7181 datasheet(3/8 Pages) ROHM

Teilenummer	BA7181

Bauteilbeschribung	2-channel PRE / REC amplifier with auto-tracking interface

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Hersteller	ROHM [Rohm]

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3

Video ICs

BA7181FS

Note: dBc: dB below carrier (used to express relative level from carrier reference for convenience sake).

∗ Design reference values.

Parameter

Symbol Min.

Typ. Max.

Unit

Conditions

〈Playback system〉

Output DC offset

Input conversion noise∗

AGC output level

AGC control sensitivity

AGC amp frequency

characteristic∗

PB switch ON resistance∗

PRE CH 2 threshold voltage

PRE CH 1 threshold voltage

ENVE residual voltage

ENVE output level

ENVE saturation voltage

PB mode holding voltage

EE mode holding voltage

REC mode holding voltage

Pin 14 output DC offset for pin 1: H / L

Rg = 10

Ω, input conversion of pin 14 output noise

VIN = 0.3mVP-P, pin 18 output measurement

Pin 18 output difference for VIN = 0.15

~ 0.6mVP-P

Pin 18 output level difference for

f = 8.0 / 1.0MHz, VIN = 0.3mVP-P

Pin 7 impedance

Pin 1 DC voltage for channel 2 operation

Pin 1 DC voltage for channel 1 operation

Pin 13 output measurement with no signal

Pin 13 output measurement when pin 14

output = 400mVP-P

Pin 13 output measurement for large signal

Pin 8 DC voltage for PB mode

Pin 8 DC voltage for REC MUTE mode

Pin 8 DC voltage for REC mode

∆VODC

—

0

150 mVP-P

Fig.1

VNIN

—

0.25

—

µVrms

Fig.1

VAGC

250

300

350 mVP-P

Fig.1

∆VAGC

—

0.3

2.0

dB

Fig.1

∆GVAF

—

0.5

—

dB

Fig.1

RON7

—4

—

Ω

Fig.1

VTH1H

3.5

—

VCC

V

Fig.1

VTH1L

0

—

1.2

V

Fig.1

VENV1

—

0.7

1.0

V

Fig.1

VENV2

2.4

2.9

3.4

V

Fig.1

VENV3

4.0

4.5

—

V

Fig.1

VTH10H

3.8

—

VCC

V

Fig.1

VTH10M

2.2

—

2.8

V

Fig.1

VTH10L

0

—

1.2

V

Fig.1

Measurement

circuit

(Fig. 1 measurement circuit, pin 8: “H” )

(unless otherwise noted, Ta = 25°C, VCC = 5.0V, f = 4.0MHz and IOAR = 30mAP-P)

Parameter

Symbol Min.

Typ.

Max.

Unit

〈Recording system〉

Supply current

Recording AGC level

AGC control sensitivity

REC Amp frequency

characteristic∗

2nd harmonic distortion∗

3rd harmonic distortion∗

Cross modulation distortion∗

Maximum output level

Recording current load

characteristic∗

Mute attenuation ratio

AGC mode holding voltage

Iq(R)

—

72

110

mAP-P

Fig.2

IOAR

27

30

33

mA

Fig.2

∆IOAR

—

0.3

1.5

dB

Fig.2

∆IOAF

—

– 1.5

—

dB

Fig.2

2HDR

—

– 45

—

dBc

Fig.2

3HDR

—

– 50

—

dBc

Fig.2

CMDR

—

– 50

—

dBc

Fig.2

IOMR

40

50

—

mAP-P

Fig.2

∆IORL

—

– 0.35

—

dB

Fig.2

MUR

—

– 45

– 38

dBc

Fig.2

VTH15H

2.7

—

V

Fig.2

VTH15L

0

—

1.2

V

Fig.2

No signal

Pin 12 input = 125mVP-P, pin 7 output measurement

Pin 7 output level difference for pin 12

input = 62.5mVP-P and 250mVP-P

Pin 7 output level difference for f = 8.0 / 1.0MHz,

pin 12 input = 125mVP-P

Pin 12 input = 125mVP-P, 8MHz spurious

Pin 12 input = 125mVP-P, 12.0MHz spurious

4.0MHz

± 630kHz spurious

When pin 7 output 2nd harmonic distortion is – 30dB

Pin 7 output level difference for load L: 8.2 ~ 12

µH

Pin 7 output level difference for pin 8: M / H

Pin 15 DC voltage to maintain recording AGC operation

Pin 15 DC voltage to maintain recording AGC stopped

Conditions

VCC

Measurement

circuit

(Pin 8 in Fig. 2 measurement circuit “L” )

∗ Design reference values.

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