BH7273KV

Video ICs Equalizer and ATF circuit IC for Digital VCRs BH7273KV The BH7273KV is an equalizer and ATF circuit IC developed for use with digital video cassettes (DVC). By using this IC, it is simple to design the filter for the equalizer required for DVD sets. In addition, the ATF circuit detects the pilot signals and generates error signals. Applications Equalizers and ATFs for digital VCRs Features 1) Enables the configuring of all pass filters, 1 + D circuits, and transversal filters (TVF). 2) Built-in VCA, amplifier, buffer, and mixer amplifier. 3) Detects the ATF pilot signal and generates an ATF error signal. 4) Built-in 1.5MHz LPF, VCA, 465kHz BPF, 697.5kHz BPF, 25dB amplifier, peak detector, and subtractor. 5) Intermediate frequencies are variable by controlling the voltages for the 465kHz BPF and 697.5kHz BPF. Absolute maximum ratings (Ta = 25°C) Parameter Applied voltage Power dissipation Operating temperature Storage temperature Symbol VCC Pd Topr Tstg Limits 7.0 ∗ 1000 Unit V mW °C °C – 20 ~ + 65 – 55 ~ + 125 ∗ When mounted on a 70mm × 70mm × 1.6mm glass epoxy board. ∗ Reduced by 10.0mW for each increase in Ta of 1°C over 25°C. Recommended operating conditions (Ta = 25°C) Parameter Power supply voltage Symbol VCC 5V Min. 4.6 Typ. 4.9 Max. 5.2 Unit V Conditions 2, 15, 21, 33, 44, 48, 60pin ᭺Not designed for radiation resistance. 1 Video ICs BH7273KV Block diagram OFFSET BIAS OUT SUBSTRACT OUT OFFSET BIAS F2 DET OUT F1 DET OUT MIX + OUT MIX – OUT ...