2-channel PRE / REC amplifier with auto-tracking interface - Rohm
Description
Video ICs
2-channel PRE / REC amplifier with auto-tracking interface
BA7182AS
The BA7182AS 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 59dB (Typ.
), and has a low-noise preamplifier.
Designed for VHS-band operation with low external parts count.
The IC has 2 circuits for 2-head VCR applications.
2) Two playback output systems (throgh output and AGC output).
The AGC output level is 270mV P-P (Typ.
) ; suitable for FM brightness signal output.
3) Auto-tracking interface for automated tracking adjustment.
An integrate and hold detector is used to reduce the load on the microcontroller.
4) The recording amplifier uses constant-current BLT drive that handles load variations (i.
e.
headimpedance) 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 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 1100∗ – 20 ~ + 75 – 55 ~ + 125 Unit V mW °C °C
∗
Reduced by 11mW 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 12pin
᭺Not designed for radiation resistance.
1
Video ICs
BA7182AS
•Block diagram
DFF IN
1
22
GND 2
DET FILTER
2
21
EP / SP CTRL
S/H
HPF
DE...
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