CF5019 High-Frequency 3rd Overtone Crystal Oscillator Module ICs

The CAMD CM8870 CM8870C offers complete DTMF receiver functionality by combining both the band-split filter and digital decoder capabilities into a single 18-pin DIP, SOIC, or 20-pin PLCC package. The CM8870C is produced using advanced CMOS process technology, ensuring low power consumption (maximum 35mW) and accurate data processing. The filter section employs a switched capacitor technique for both high and low group filters.

The CAMD CM8870 CM8870C is designed to efficiently decode Dual-Tone Multi-Frequency (DTMF) signals, which are commonly used in telephone systems for signaling. The integration of the band-split filter and digital decoder into a compact package simplifies the overall design of DTMF applications, allowing for reduced board space and lower component count.

The device operates by receiving the DTMF signals, which consist of pairs of tones generated by pressing the keys on a telephone keypad. The band-split filter section separates these tones into high and low frequency groups. This separation is critical for the accurate detection of the DTMF signals. The switched capacitor filters are implemented for both high and low groups, providing a precise and reliable method for filtering the incoming signals.

Once the signals are filtered, the digital decoder processes the output from the filters to identify the specific DTMF tones. The decoder translates these tones into binary-coded decimal (BCD) outputs, which can be used by microcontrollers or other digital systems for further processing or control applications.

The use of CMOS technology in the CM8870C not only minimizes power consumption but also enhances the overall performance of the device by improving noise immunity and signal integrity. This makes the CM8870C suitable for battery-operated devices and applications where power efficiency is critical.

In summary, the CAMD CM8870 CM8870C is an integrated solution for DTMF signal processing, combining advanced filtering and decoding capabilities in a compact form factor, ideal for a wide range of telecommunications applications.The CAMD CM8870 CM8870C provides full DTMF receiver capability by integrating both the band-split Filter and digital decoder functions into a single 18-pin DIP, SOIC, or 20-pin PLCC package. The CM8870 70C is manufac- tured using state-of-the-art CMOS process technology for low power consumption (35mW, MAX) and precise data handling.

The Filter se ction uses a switched capaci- tor technique for both high and low group Filters and dial By California Micro Devices Corporation 🔗 External reference