The BA7184S is a PRE / REC amplifier developed for use in video cassette recorders. It is compatible with four-head decks and features built-in FB damping, four preamplifiers, a chroma output amplifier, an FM output amplifier (with AGC), an envelope detector and envelope comparator, a constant-current BTL-drive REC amplifier (with AGC) and channel switching, EP / SP switching, and mode switching integrated onto a single monolithic IC.

Features

1) The playback amplifier has a total gain of 56dB (Typ.), and has a low-noise preamplifier. Designed for VHS band operation with low external parts count. The IC has 4 circuits for 4-head VCR applications.

2) Two playback output systems (through output and AGC output). The AGC output level is 315mVP-P (Typ.); suitable for FM brightness signal output.

3) Auto-tracking interface for automated tracking adjustment. Linear detector characteristic with sensitivity that can be set using external components.

4) The recording amplifier uses constant-current BLT drive that handles load variations (i.e. headimpedance) well, and gives stable recording characteristics. 2 circuits are provided for 4-head VCR use.

5) Built-in recording level AGC means adjustment of FM recording current is not necessary.

6) Head switches for 4-channel PRE / REC system provided.

7) Operates off a single 5V power supply, with low power dissipation.

Applications

VCRs