4-channel PRE / REC amplifier - Rohm
Description
Video ICs
4-channel PRE / REC amplifier with auto-tracking interface
BA7184S
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.
Applications • VCRs
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 315mV P-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.
•Absolute maximum ratings (Ta = 25°C)
Parameter Applied voltage Power dissipation Operating temperature Storage temperature Symbol VCC Pd Topr Tstg Limits 7.
0 1050∗1 – 20 ~ + 65 – 55 ~ + 125 Unit V mW °C °C
∗1 Reduced by 10.
5mW for each increase in Ta of 1°C over 25°C (free air).
•Recommended operating conditions (Ta = 25°C)
Parameter Playback / recording Symbol VCC Min.
4.
5 Typ.
5.
0 Max.
5.
5 Unit V Conditions 13pin
᭺ Not designed for radiation resistance.
1
Video ICs
BA7184S
•Block diagram
24 AT ENVE FB GND...
Similar Datasheet
