XTR101AP Precision 4mA to 20mA Transmitter DIP-14 (XTR101AP IC)
The XTR101AP is a high-accuracy, two-wire 4mA to 20mA transmitter designed to convert low-level input signals into a standard industrial current loop. Housed in a 14-pin DIP package, it integrates a precision instrumentation amplifier, a voltage-controlled current source, and two matched current sources for sensor excitation. This single-chip solution is engineered to operate directly from the power available in the current loop, making it ideal for remote sensing applications.
This IC is a professional standard in India for industrial process control, where it is used to transmit data from RTDs, thermocouples, and bridge-type sensors over long distances with high noise immunity. Its ability to provide both signal amplification and the 4mA to 20mA current conversion in one package simplifies the design of field-mounted transmitters.
Key Features
- Two-Wire Operation: Powered directly by the current loop (no local power supply needed).
- Precision Instrumentation Amp: High-accuracy input stage with low offset voltage (30uV max).
- Integrated Excitation: Two matched 0.8mA current sources to power RTDs or bridges.
- Wide Loop Supply: Operates on loop voltages ranging from 11.6V to 40V.
- High Noise Immunity: Current-loop transmission is inherently resistant to EMI and voltage drops over long cables.
- Adjustable Span and Zero: Allows for precise calibration of the output current range.
- Internal Voltage Reference: Includes a stable reference for sensor offset or excitation.
Specifications
- IC Type: 4mA to 20mA Current Loop Transmitter
- Accuracy: 0.01% typical nonlinearity
- Input Offset Drift: 0.75uV/C
- Common Mode Rejection (CMR): 100dB minimum
- Operating Current (Quiescent): < 4mA (total chip current)
- Output Current Range: 4mA to 20mA (Industrial Standard)
- Package Type: PDIP-14
- Operating Temperature: -40 to +85 degrees Celsius
Pinout Configuration (14-Pin DIP)
- Pin 1 (V+): Positive Supply/Loop Connection
- Pin 2 (I-RET): Current Return Path
- Pin 3 (+IN): Non-Inverting Input
- Pin 4 (-IN): Inverting Input
- Pin 5 (RG1): Gain Set Resistor Connection 1
- Pin 6 (RG2): Gain Set Resistor Connection 2
- Pin 7 (V-): Negative Supply Connection (Internal)
- Pin 8 (I-OUT): Output Current Loop (Return to Source)
- Pin 9 (REF-OUT): Reference Voltage Output
- Pin 10 (REF-ADJ): Reference Adjust
- Pin 11 (FS1): Internal Current Source 1 (0.8mA)
- Pin 12 (FS2): Internal Current Source 2 (0.8mA)
- Pin 13 (NC): No Connection
- Pin 14 (NC): No Connection
