MX105A

DATA BULLETIN MX105A Tone Detector FEATURES Operates in High Noise Conditions ≥36 dB Signal Input Range High Sensitivity Low Power Operation 2.7 V to 5.5 V Adjustable Bandwidth Adjustable Frequency PRELIMINARY INFORMATION APPLICATIONS Single and Multitone System Applications C4 C2A 7 8 C2B R2 4 Loop Filter -+ Tone In C5 R3 2 Input Amp 1 3 - VDD/2 + Timing Logic Detect Filter -+ VDD 16 5 C3A 6 C3B C6 11 R4 12 VCO Detect Counter 13 15 14 MX105A C1B R1 C1A 10 9 Detect RL Out The MX105A is a monolithic CMOS tone detector for tone decoding in single and multitone signaling systems. Using phase locked loop (PLL) decoding techniques, the MX105A recognizes tones in the presence of high noise levels and strong adjacent channel tones. Detection frequency and bandwidth can each be independently adjusted. The design is immune to high levels of harmonic and sub-harmonic noise. It also maintains excellent noise immunity and constant bandw...