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BA7743S, BA7745FS, BA7746FS

Table of contents:
Info of BA7743S
Info of BA7745FS
Info of BA7746FS

BA7743S, BA7745FS, BA7746FS Selling Leads, Datasheet

MFG:ROHM Package Cooled:09+ D/C:1000

BA7743S, BA7745FS, BA7746FS Datasheet download

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Part Number: BA7743S

MFG: ROHM

Package Cooled: 09+

D/C: 1000

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BA7745FS General Description

The BA7745FS has the recording and playback amplifiers required for Hi-Fi VCR signal processing, and also contains a flying-erase oscillator. The recording system uses a constant-current amplifeir with AGC to eliminate the need to adjust the recording current, and ensure stable operation as the head wears. The IC also features REC MUTE and OVER REC functions .

The playback system has a high-gain preamplifier, a low-offset head switch, a VCA and an EP-gain amplifier. The flying-erase oscillator has low 2nd and 3rd harmonic distortion, and when connected to an external driver large output current can be obtained.

A H / L control system eliminates the need for special power supplies for the recording and playback systems. The IC has low power consumption, and comes in a compact 32-pin SSOP-P package that requires little area on the PCB. It will improve the reliability and performance of your designs while reducing external component requirements.

BA7745FS Maximum Ratings

Parameter	Symbol	Limits		Unit
Power supply voltage	V_cc	PB / REC system	7.0	V
		FE system	12.5
Power dissipation	P_d	1000^*		mW
Operating temperature	T_opr	10~ + 70
Storage temperature	T_stg	−55 ~+125

BA7745FS Features

The low-noise playback amplifier has a total gain of 83dB (Typ.). Designed for VHS-bandoperation with low external parts count. It has two built-in circuits for Hi-Fi VCR operation.
The circuit has been designed to suppress headswitching noise.
Built-in EP / SP gain switching function that boosts the playback gain by 5dB.
Built-in VCA for easy playback output adjustment.
High-output recording amplifier for audio FM recording.
Constant-current drive provides stable recording characteristics when the load (head impedance) is fluctuating.
Built-in recording level AGC eliminates the need to adjust recording current.
Built-in low-pass filter limits the input bandwidth of the recording amplifier.
Built-in OVER REC recording current amplifier function and REC MUTE function that stops recording output.
Built-in high-frequency oscillator for use with flying erase function.
Record / playback switching can be done directly via the system controller, and consumes litlle power.
Possible to construct a high-performance audio system by pairing this chip with a Hi-Fi-audio signal processing IC.

BA7745FS Typical Application

VCRs

BA7745FS Connection Diagram

BA7746FS General Description

The BA7746S and BA7746FS contains the recording and playback amplifiers required for Hi-Fi VCR signal processing. The recording system uses a constant-current amplifier with AGC to eliminate the need to adjust the recording current, and ensure stable operation as the head wears. The IC also features REC MUTE and OVER REC functions. The playback system has a high-gain preamplifier, a low- offset head switch, VCA, and an EP-gain amplifier.

In addition, all functions operate off a single 5V supply, and a H / L control system eliminates the need for special power supplies for the recording and playback systems. The IC has low power consumpution, and comes in a compact 32-pin SSOP-A package that requires little area on the PCB. It will improve the reliability and performance of your designs while reducing external component requirements.

BA7746FS Maximum Ratings

Parameter		Symbol	Limits	Unit
Power supply voltage		V_CC	7.0	V
Power dissipation	BA7746S	P_d	1050^*1	mV
Power dissipation	BA7746FS	P_d	800^*2	mW
Operating temperature		T_opr	10 ~ + 70
Storage temperature		T_stg	55 ~ + 125

BA7746FS Features

The low-noise playback amplifier has a total gain of 79dB (Typ.). Designed for VHS-band operation with low external parts count. It has two built-in circuits for Hi-Fi VCR operation.
The circuit has been designed to suppress headswitching noise.
Built-in EP / SP gain switching function that boosts the playback gain by 5dB.
Built-in VCA for easy playback output adjustment.
High-output recording amplifier for audio FM recording.
Constant-current drive povides stable recording characteristics when the load (head impedance) is fluctuating.
Built-in recording level AGC eliminates the need to adjust recording current.
Built-in low-pass filter limits the input bandwidth of the recording amplifier.
Built-in OVER REC recording current amplifier function and REC MUTE function that stops recording output.
Low power consumption. Operates off a single 5V power supply.
Record / playback switching can be done directly via the system controller, and consumes littele power.
Possible to construct a high-performance audio system by pairing this chip with a Hi-Fi-audio signal processing IC.

BA7746FS Typical Application

VCRs

BA7746FS Connection Diagram

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