Overview
The A5191HRTPG-XTD is a single-chip, CMOS modem designed by onsemi for use in Highway Addressable Remote Transducer (HART) field instruments and masters. This modem integrates all the necessary functions to meet HART physical layer requirements, including modulation, demodulation, receive filtering, carrier detection, and transmit-signal shaping. It operates using phase continuous frequency shift keying (FSK) at a rate of 1200 bits per second, making it suitable for half-duplex communication. The device is optimized for low power consumption, which is ideal for intrinsically safe applications.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Ambient Temperature (TA) | -40 | +85 | °C | |
| Supply Voltage (VDD) | -0.3 | 6.0 | V | |
| Input Voltage, Low (VIL) | 0.3 * VDD | V | ||
| Input Voltage, High (VIH) | 0.7 * VDD | V | ||
| Output Voltage, Low (VOL) | 0.4 | V | ||
| Output Voltage, High (VOH) | 2.4 | V | ||
| Power Supply Current (IDDA) | 150 | 300 | 600 | μA |
| Dynamic Digital Current (IDDD) | 25 | 200 | μA | |
| Analog Reference Voltage (AREF) | 1.2 | 1.235 | 2.5 | V |
| Carrier Detect Reference (CDREF) | 1.15 | 2.42 | V |
Key Features
- Single-chip, half-duplex 1200 bits per second FSK modem
- Bell 202 shift frequencies of 1200 Hz and 2200 Hz
- 3.0 V to 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
- Pb-free devices
Applications
- HART multiplexers
- HART modem interfaces
- 4-20 mA loop powered transmitters
Q & A
- What is the primary function of the A5191HRTPG-XTD?
The A5191HRTPG-XTD is a single-chip modem designed for use in Highway Addressable Remote Transducer (HART) field instruments and masters, providing modulation, demodulation, and other necessary functions for HART communication.
- What is the operating temperature range of the A5191HRTPG-XTD?
The device operates within an ambient temperature range of -40°C to +85°C.
- What are the power supply requirements for the A5191HRTPG-XTD?
The device operates with a power supply voltage of 3.0 V to 5.5 V.
- What type of modulation does the A5191HRTPG-XTD use?
The device uses phase continuous frequency shift keying (FSK) at 1200 bits per second.
- What are the typical applications of the A5191HRTPG-XTD?
The device is typically used in HART multiplexers, HART modem interfaces, and 4-20 mA loop powered transmitters.
- What packages is the A5191HRTPG-XTD available in?
The device is available in 28-pin PLCC, 32-pin QFN, and 32-pin LQFP packages.
- Is the A5191HRTPG-XTD Pb-free?
- What is the role of the internal oscillator in the A5191HRTPG-XTD?
The internal oscillator requires a 460.8 kHz crystal or ceramic resonator to function.
- How does the device conserve power?
The receive circuits are disabled during transmit operations and vice versa to conserve power.
- What is the significance of the carrier detect feature in the A5191HRTPG-XTD?
The carrier detect feature helps in identifying the presence of a valid HART signal.
- How does the device handle signal filtering?
The received FSK signal is filtered using a band-pass filter to block interferences outside the HART signal band.
