Overview
The RCV420JP is a precision 4mA to 20mA current-loop receiver designed and manufactured by Texas Instruments. This monolithic circuit is intended to convert a 4–20mA input signal into a 0–5V output signal, making it highly versatile for various industrial and control applications. The device features high reliability, low cost, and ease of use, eliminating the need for adjustments in gain, offset, or common-mode rejection (CMR). It includes a premium-grade operational amplifier, an on-chip precision resistor network, and a precision 10V reference, ensuring high accuracy and noise immunity.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Gain Initial | 0.3125 | V/mA | ||
| Gain Error | 0.05 | 0.15 | % of span | |
| Gain Error—JP Grade | 0.25 | % of span | ||
| Gain Error vs Temp | 15 | ppm/°C | ||
| Nonlinearity | 0.0002 | 0.002 | % of span | |
| Output Rated Voltage | 10 | 12 | V | |
| Output Rated Current | +10, –5 | mA | ||
| Input Sense Resistance | 74.25 | 75 | 75.75 | Ω |
| Input Impedance (Common-Mode) | 200 | kΩ | ||
| Common-Mode Voltage | ±40 | V | ||
| CMR | 70 | 80 | dB | |
| Offset Voltage (RTO) | 1 | mV | ||
| Zero Error Initial | 0.025 | 0.075 | % of span | |
| Temperature Range Specification | 0 | 70 | °C | |
| Thermal Resistance, θJA | 80 | °C/W |
Key Features
- Complete 4-20mA to 0-5V Conversion: The RCV420JP converts a 4–20mA input signal into a 0–5V output signal.
- Internal Sense Resistors: Features precision internal sense resistors.
- Precision 10V Reference: Includes a precision 10V reference with a typical drift of 5ppm/°C.
- Built-In Level-Shifting: Provides built-in level-shifting capabilities.
- High CMR and Noise Immunity: Offers ±40V common-mode input range and 86dB CMR, ensuring high noise immunity.
- Low Output Impedance: Differential output impedance of 0.01 Ω.
- High Accuracy: Achieves 0.1% overall conversion accuracy.
- No Adjustments Required: No need for adjustments in gain, offset, or CMR, simplifying design and manufacturing.
Applications
- Process Control: Suitable for process control systems where precise signal conversion is critical.
- Industrial Control: Used in industrial control systems for reliable and accurate signal processing.
- Factory Automation: Ideal for factory automation environments requiring high precision and reliability.
- Data Acquisition: Employed in data acquisition systems to convert current signals to voltage signals accurately.
- SCADA and RTUs: Utilized in Supervisory Control and Data Acquisition (SCADA) systems and Remote Terminal Units (RTUs).
- Machine Monitoring: Used for monitoring machine health and performance in various industrial settings.
Q & A
- What is the primary function of the RCV420JP?
The RCV420JP is designed to convert a 4–20mA input signal into a 0–5V output signal.
- What is the accuracy of the RCV420JP?
The RCV420JP achieves an overall conversion accuracy of 0.1%.
- What is the common-mode rejection ratio (CMR) of the RCV420JP?
The CMR of the RCV420JP is 80dB.
- What is the temperature range for the RCV420JP?
The operating temperature range is 0°C to 70°C, and the storage temperature range is –40°C to 85°C.
- Does the RCV420JP require any adjustments for gain, offset, or CMR?
No, the RCV420JP does not require any adjustments for gain, offset, or CMR.
- What is the purpose of the precision 10V reference in the RCV420JP?
The precision 10V reference provides a precise output with a typical drift of 5ppm/°C and is used for level-shifting and offset adjustments.
- How does the RCV420JP maintain high CMR?
The RCV420JP maintains high CMR through resistor matching and tracking within its internal resistor network and by ensuring low source impedance.
- What are some common applications of the RCV420JP?
The RCV420JP is commonly used in process control, industrial control, factory automation, data acquisition, SCADA systems, RTUs, and machine monitoring.
- What is the typical output impedance of the RCV420JP?
The differential output impedance of the RCV420JP is 0.01 Ω.
- How can the output voltage of the RCV420JP be level-shifted?
The output voltage can be level-shifted using either the Ref In pin or the Rcv Com pin, with the Rcv Com pin recommended for large offsets.
