Baby Monitor Transmitter

MCD Lily is a transmitter module of wireless audio transmission (not including audio circuit). With 22 built-in frequency points of 40/49 MHz, it meets the needs of European baby monitor CE/FCC. The module consists of PLL, VCO, ROM, audio modulation, high frequency amplification and other circuits. Voice transmitter could be made by simply adding corresponding audio and control circuits, a MIC, an antenna and a shell. Since the 1980s, manufacturing industry of 40/49 MHz baby monitor generally gets operating frequency by crystal oscillation, and then multiplying frequency three times. Therefore, the circuit is filled with unnecessary multiplied harmonic wave and fundamental wave. In order to clear the unnecessary frequency, tune of intermediate frequency turner is generally adopted to select the desired frequencies, which leads to the fact that production debugging becomes complex, and each operating frequency with each corresponding crystal. MCD Lily is characterized by built-in VCO PLL chips of MCD 2006S, whose read-only memory saves all frequency points of 40/49MHz baby monitor. By simply setting level of 4 input ports according to fixed logic, programming MCU could be reduced. With the chips, manufacturers could: 1. Reduce production manpower. 2. Reduce production cost. 3. Simplify production process. 4. Improve product stability. 5. Pass CE/FCC certification easily. The transmitting power of MCD Lily is 10dBm or 0dBm. If the receiving sensitivity of corresponding receiver is 108dBm 12dBSINAD, with a reasonably matched antenna, the transmission distance of baby monitors using MCD Lily in open space could reach 300m, and indoor transmission distance across rooms is 50m, without staccato.

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