应用功能： 锁相环调谐UHF和VHF音频/视频调制器 The MC44BS373CA is a multi-standard, PAL/SECAM/NTSC modulator.The channel is set by an on-chip high-speed I2C-compatible bus receiver. A phase-locked loop (PLL) tunes the modulator over the full UHF range. The modulator incorporates a sound subcarrier oscillator and uses a second PLL to derive 4.5-, 5.5-, 6.0-, and 6.5-MHz subcarrier frequencies. These frequencies are selectable by bus.
