INA125P Instrumentation Amplifier with Precision Voltage Reference DIP-16 (INA125P IC)
The INA125P is a specialized low-power, high-accuracy instrumentation amplifier that includes an integrated precision voltage reference. Housed in a 16-pin DIP package, it is uniquely designed to provide complete bridge excitation and differential amplification on a single chip. This makes it the industry-standard choice for interfacing with load cells, pressure transducers, and temperature bridges.
A standout feature of the INA125 is its adjustable voltage reference, which can be pin-selected for 1.24V, 2.5V, 5V, or 10V to match various sensor requirements. It also includes a Sleep Mode to conserve power in battery-operated systems, reducing quiescent current to practically zero when the amplifier is not in use.
Key Features
- Integrated Voltage Reference: Provides stable bridge excitation at 1.24V, 2.5V, 5V, or 10V.
- Low Quiescent Current: Consumes only 460uA during normal operation.
- Sleep Mode: Allows for system shutdown and duty-cycle operation to save battery life.
- Wide Supply Range: Operates on single supplies from 2.7V to 36V or dual supplies up to +/-18V.
- High Precision: Laser-trimmed for a low offset voltage of 250uV max and high CMR of 100dB.
- Adjustable Gain: A single external resistor sets gain from 4 to 10,000.
- Input Protection: Robust internal circuitry protects against inputs up to +/-40V.
Specifications
- IC Type: Instrumentation Amplifier with Reference
- Package Type: PDIP-16 (Through-Hole)
- Nonlinearity: 0.002% (at G=4)
- Bandwidth: 150 kHz (at G=4)
- Slew Rate: 0.2 V/us
- Input Bias Current: 20nA (Max)
- Voltage Reference Accuracy: +/-0.5% (Max)
- Operating Temperature: -40 to +85 degrees Celsius
Pinout Configuration (16-Pin DIP)
- Pin 1 (V+): Positive Supply
- Pin 2 (Sleep): Sleep Control (Logic Low = Sleep)
- Pin 3 (V-): Negative Supply (or Ground for single-supply)
- Pin 4 (-IN): Inverting Input
- Pin 5 (+IN): Non-Inverting Input
- Pin 6 (RG): Gain Set Resistor Connection 1
- Pin 7 (RG): Gain Set Resistor Connection 2
- Pin 8 (IAREF): Instrumentation Amplifier Reference (Output side)
- Pin 9 (VO): Amplifier Output
- Pin 10 (V+): Positive Supply (Internal Connection)
- Pin 11 (Sense): Voltage Reference Sense
- Pin 12 (VREFCOM): Voltage Reference Common
- Pin 13 (VREFBG): 1.24V Bandgap Reference Output
- Pin 14 (VREF2.5): 2.5V Reference Output
- Pin 15 (VREF5): 5V Reference Output
- Pin 16 (VREF10): 10V Reference Output
