BH7272KV datasheet pdf

1 Video ICs Two-channel VCR PRE / REC amplifier for Digital VCRs BH7272KV The BH7272KV is a head amplifier developed for use in digital video cassette recorders. Both PB and REC have excellent frequency characteristics making this IC an ideal choice for digital recording and playback. The small VQFP48 package facilitates compact design of portable equipment such as video cameras. • Applications Digital video cassette recorders • Features 1) The playback amplifier is a differential amplifier with an overall gain of 54dB (Typ.), and has low-noise transistors as the first stage. The feedback circuit is not included, so provide negative feedback for head peak damping, and positive feedback to cancel the input capacitance using external components. 2) The playback AGC amplifier has ± 10dB of control range. 3) The recording current amplifier is a BLT current amplifier. Use external components to construct the head peak damping circuit. 4) Recording limit amplifier is included. Recording AGC amplifier not included. 5) The signal system V CCis 4.9V, and the control sys- tem V CCis 3.0V. • Absolute maximum ratings (Ta = 25°C) • Recommended operating conditions (Ta = 25°C) ParameterSymbolLimitsUnit Applied voltage Power dissipation Operating temperature Storage temperature V CC Pd Topr Tstg 7.0 – 20 ~ + 65 – 55 ~ + 125 V mW °C °C ∗ When mounted on a 70mm × 70mm × 1.6mm glass epoxy board. ∗ Reduced by 9.0mW for each increase in Ta of 1°C over 25° . ∗ 900 Parameter SymbolMin.Typ.Max.UnitConditions Signal system Control system V CC 5V V CC 3V 4.6 2.8 4.9 3.0 5.2 3.2 V V 14, 19, 38, 47pin 16pin sNot designed for radiation resistance.

Features

• •
• •
• •
• •
• 7.0
• 4.6
• 2.8
• 4.9
• 3.0
• 5.2
• 3.2