Overview
The A5191HRTNG-XTP is a single-chip, CMOS modem designed for use in Highway Addressable Remote Transducer (HART) field instruments and masters. Produced by onsemi, this modem integrates all the necessary functions to satisfy HART physical layer requirements, including modulation, demodulation, receive filtering, carrier detection, and transmit-signal shaping. It operates using phase continuous frequency shift keying (FSK) to ensure smooth transitions between mark and space frequencies, preventing abrupt phase shifts.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Ambient Temperature (TA) | -40 | 85 | °C | |
| Storage Temperature (TS) | -55 | 150 | °C | |
| Junction Temperature (TJ) | -40 | 85 | °C | |
| Supply Voltage (VDD) | -0.3 | 6.0 | V | |
| DC Input/Output Voltage (VIN, VOUT) | -0.3 | VDD + 0.3 | V | |
| Modulator Output Frequencies | 1200 Hz (mark) | 2200 Hz (space) | Hz | |
| Receive Digital Output Rise/Fall Time | 20 | ns | ||
| Carrier Detect Output Rise/Fall Time | 20 | ns | ||
| External Clock Frequency | 460.8 kHz | kHz |
Key Features
- Single-chip CMOS modem for HART field instruments and masters.
- Phase continuous frequency shift keying (FSK) modulation and demodulation.
- Integrated receive filtering, carrier detection, and transmit-signal shaping.
- Supports 1200 baud communication speed with an 11-bit UART frame.
- Available in 28-pin PLCC, 32-pin QFN, and 32-pin LQFP packages.
- Operates with a supply voltage range of 3.0 V to 5.5 V.
- Requires a 460.8 kHz external clock or ceramic resonator.
- Includes analog and digital ground pins for improved noise isolation.
Applications
The A5191HRTNG-XTP is designed for use in various industrial automation and process control systems, particularly those requiring HART communication protocol. It is suitable for:
- HART field instruments such as transmitters, sensors, and actuators.
- HART masters and gateways.
- Industrial control systems requiring reliable and standardized communication.
- Process control applications where remote monitoring and configuration are necessary.
Q & A
- What is the primary function of the A5191HRTNG-XTP? The primary function is to serve as a single-chip CMOS modem for HART field instruments and masters, handling modulation, demodulation, and other HART physical layer requirements.
- What are the supported modulation frequencies? The modem supports frequencies of 1200 Hz for logic 1 (mark) and 2200 Hz for logic 0 (space).
- What is the communication speed of the A5191HRTNG-XTP? The communication speed is 1200 baud.
- What types of packages are available for the A5191HRTNG-XTP? It is available in 28-pin PLCC, 32-pin QFN, and 32-pin LQFP packages.
- What is the operating temperature range of the A5191HRTNG-XTP? The operating temperature range is -40°C to +85°C.
- What is the required external clock frequency? The required external clock frequency is 460.8 kHz.
- How does the modem handle phase transitions between mark and space frequencies? The modem uses phase continuous frequency shift keying (FSK) to prevent abrupt phase shifts.
- What is the purpose of the carrier detect output? The carrier detect output indicates the presence of a valid HART signal.
- What is the recommended bias current for the internal operational amplifiers and comparators? The recommended bias current is 2.5 μA.
- What is the typical application diagram for the A5191HRTNG-XTP? The typical application involves connecting the modem to a microcontroller, a DAC for 4-20 mA output, and an external clock or resonator for the oscillator.
