Overview
The INA116 is a high-performance, monolithic FET-input instrumentation amplifier produced by Texas Instruments. It is renowned for its extremely low input bias current, making it ideal for applications requiring high precision and low noise. The INA116 features Difet® inputs and special guarding techniques, which contribute to its exceptional performance characteristics. This amplifier is available in 16-pin plastic DIP and SOL-16 surface-mount packages and is specified for operation over a temperature range of –40°C to +85°C.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Input Offset Voltage, RTI | TA = +25°C | ±0.5 | ±2 | ±6 | mV |
| Input Bias Current | TA = +25°C | ±3 | ±25 | ±100 | fA |
| Common-Mode Rejection | VCM = ±11V, ∆RS = 1kΩ, G = 10 | 84 | 92 | 78 | dB |
| Quiescent Current | VIN = 0V | ±1 | ±1.4 | ±6 | mA |
| Safe Input Voltage | ±40 | V | |||
| Bandwidth, –3dB | G = 1 | 800 | kHz | ||
| Slew Rate | G = 10 to 200 | 0.8 | V/µs | ||
| Temperature Range | –40 | +85 | °C |
Key Features
- Extremely low input bias current: 3fA at 25°C and 25fA at 85°C.
- Low offset voltage: ±2mV max.
- High common-mode rejection: up to 94dB at G = 1000.
- Low quiescent current: 1.4mA.
- Input over-voltage protection: ±40V.
- Buffered guard drive pins to maintain low input bias current.
- Gain adjustable from 1 to 1000 using a single external resistor.
- Available in 16-pin plastic DIP and SOL-16 surface-mount packages.
Applications
- Laboratory instrumentation.
- pH measurement.
- Ion-specific probes.
- Leakage current measurement.
Q & A
- What is the typical input bias current of the INA116?
The typical input bias current of the INA116 is 3fA at 25°C and 25fA at 85°C.
- What is the maximum offset voltage of the INA116?
The maximum offset voltage of the INA116 is ±2mV.
- How is the gain of the INA116 set?
The gain of the INA116 is set by connecting a single external resistor, RG, according to the equation G = 1 + 50kΩ / RG.
- What is the common-mode rejection ratio (CMRR) of the INA116?
The CMRR of the INA116 is up to 94dB at G = 1000.
- What is the safe input voltage range for the INA116?
The safe input voltage range for the INA116 is ±40V).
- What are the typical applications of the INA116?
The INA116 is typically used in laboratory instrumentation, pH measurement, ion-specific probes, and leakage current measurement).
- What are the available package types for the INA116?
The INA116 is available in 16-pin plastic DIP and SOL-16 surface-mount packages).
- What is the temperature range for the INA116?
The INA116 is specified for operation over a temperature range of –40°C to +85°C).
- How does the INA116 protect against input over-voltage?
The INA116 has input over-voltage protection up to ±40V).
- What is the significance of the guard drive pins in the INA116?
The guard drive pins in the INA116 help maintain low input bias current by driving circuit board and input cable guards).
