A5191HRT

A5191HRT HART Modem Description The A5191HRT is a single−chip, CMOS modem for use in highway addressable remote transducer (HART) field instruments and masters. The modem and a few external passive components provide all of the functions needed to satisfy HART physical layer requirements including modulation, demodulation, receive filtering, carrier detect, and transmit−signal shaping. The A5191HRT uses phase continuous frequency shift keying (FSK) at 1200 bits per second. To conserve power the receive circuits are disabled during transmit operations and vice versa. This provides the half−duplex operation used in HART communications. Features Single−chip, Half−duplex 1200 Bits per Second FSK Modem Bell 202 Shift Frequencies of 1200 Hz and 2200 Hz 3.0 V − 5.5 V Power Supply Transmit−signal Wave Shaping Receive Band−pass Filter Low Power: Optimal for Intrinsically Safe Applications Compatible with 3.3 V or 5 V Microcontroller Internal Oscillator Requires 460.8 kHz Crystal or Ceramic Resonator Meets HART Physical Layer Requirements Industrial Temperature Range of −40°C to +85°C Available in 28−pin PLCC, 32−pin QFN and 32−pin LQFP Packages These are Pb−Free Devices Applications HART Multiplexers HART Modem Interfaces 4 − 20 mA Loop Powered Transmitters www.onsemi.com PLCC−28 P SUFFIX CASE 776AA QFN−32 N SUFFIX CASE 488AM LQFP−32 L SUFFIX CASE 561AB MARKING DIAGRAMS (Top Views) 1 28 A5191HRTPG AWLYYWW A5191 HRTL AWLYYWWG 32 1 1 A5191 HRTNG AWL...