2-channel PRE / REC amplifier with auto-tracking interface - Rohm
Description
Video ICs
2-channel PRE / REC amplifier with auto-tracking interface
BA7180AS / BA7180AFS
The BA7180AS and BA7180AFS are PRE / REC amplifiers developed for use in video cassette recorders.
They have been designed for use in two-head decks and feature built-in FB damping, two preamplifiers, a chroma output amplifier, an FM output amplifier (with AGC), an envelope detector, a constant-current BTL-drive REC amplifier (with AGC) and built-in channel and REC / PB switches on a single monolithic IC.
Applications • VCRs Features • 1) The playback amplifier has a total gain of 57dB (Typ.
), and has a low-noise preamplifier.
Designed for VHSband operation with low external parts count.
The ICs have 2 circuits for 2-head VCR applications.
2) Two playback output systems (through output and AGC output).
The AGC output level is 300mVP-P (Typ.
); suitable for FM brightness signal output.
3) Auto-tracking interface for automated tracking adjustment.
The detector characteristic is non-linear to improve tracking accuracy during playback of low signal levels.
4) The recording amplifier uses constant-current BLT drive that handles load variations (i.
e.
head impedance) well, and gives stable recording characteristics.
A single circuit is provided for 2-head VCR use.
5) Built-in recording level AGC means adjustment of FM recording current is not necessary.
6) Head switches for 2-channel PRE / REC system provided.
7) Operates off a sigle 5V power supply, with low power dissipation.
•Absolute maximum ratings (Ta = 25°C)
Parameter Power supply voltage Power dissipation BA7180AS BA7180AFS Symbol VCC Pd Topr Tstg Limits 7.
0 1000∗1 937.
5∗2 – 20 ~ + 65 – 55 ~ + 150 Unit V mW °C °C
Operating temperature Storage temperature
∗1 Reduced by 10.
0mW for each increase in Ta of 1°C over 25°C (free air).
∗2 When mounted on a 90mm × 90mm, t = 1.
6mm glass epoxy board, reduced by 7.
5mW for each
increase in Ta of 1°C over 25°C.
•Recommended operating conditions (Ta = 25°C)
Parameter Playback / recording ...
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