Overview
The A5191HRTLG-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, with frequencies of 1200 Hz and 2200 Hz, corresponding to data values of 0 and 1, respectively.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Supply Voltage (VDD) | 3.0 | - | 5.5 | V |
| Ambient Temperature (TA) | -40 | - | 85 | °C |
| 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 (3.3V), 300 (5V) | μA |
| Dynamic Digital Current (IDDD) | - | - | 25 (5V) | μA |
| Carrier Detect Reference (CDREF) | 1.15 | - | 2.42 | V |
| External Clock Frequency | 456.2 | 460.8 | 465.4 | kHz |
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 A5191HRTLG-XTD used for?
The A5191HRTLG-XTD is used in Highway Addressable Remote Transducer (HART) field instruments and masters.
- What is the communication speed of the A5191HRTLG-XTD?
The communication speed is 1200 bits per second.
- What are the operating frequencies of the A5191HRTLG-XTD?
The operating frequencies are 1200 Hz and 2200 Hz.
- What is the power supply range for the A5191HRTLG-XTD?
The power supply range is 3.0 V to 5.5 V.
- Is the A5191HRTLG-XTD suitable for intrinsically safe applications?
Yes, it is designed for low power consumption, making it optimal for intrinsically safe applications.
- What types of packages is the A5191HRTLG-XTD available in?
It is available in 28-pin PLCC, 32-pin QFN, and 32-pin LQFP packages.
- What is the temperature range for the A5191HRTLG-XTD?
The industrial temperature range is -40°C to +85°C.
- Does the A5191HRTLG-XTD require an external clock signal?
Yes, it requires a 460.8 kHz clock signal, which can be provided by an external clock or a ceramic resonator.
- How does the carrier detect function work in the A5191HRTLG-XTD?
The carrier detect function is based on the difference between the carrier detect reference voltage (CDREF) and the analog reference voltage (AREF).
- What is the purpose of the bias current resistor in the A5191HRTLG-XTD?
The bias current resistor controls the operating parameters of the internal operational amplifiers and comparators.
- Is the A5191HRTLG-XTD Pb-free?
Yes, the device is Pb-free.
