2-channel PRE / REC amplifier with auto-tracking interface - Rohm
Description
Video ICs
2-channel PRE / REC amplifier with auto-tracking interface
BA7181FS
The BA7181FS is a PRE / REC amplifier developed for use in video cassette recorders.
It has been designed for use in two-head decks and features 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 VHS-band operation with low external parts count.
The IC has two circuits for two-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 is provided for automated tracking adjustment.
The detector characteristic is linear, and the sensitivity can be adjusted using external components.
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 two-head VCR use.
5) Built-in recording level AGC means adjustment of FM recording current is not necessary.
6) Head switches for two-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.
0 937.
5∗ – 20 ~ + 65 – 55 ~ + 150 Unit V mW °C °C
∗ When mounted on a 90mm
× 50mm, t = 1.
6mm glass epoxy board.
Reduced by 7.
5mW for each increase in Ta of 1°C over 25°C.
•Recommended operating (Ta = 25°C)
Parameter Playback / recording (voltage range)
᭺Not designed for radiation resistance.
Symbol VCC
Min.
4.
5
Typ.
5.
0
Max.
5.
5
Unit V
Conditions 11pin
1
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