Overview
The INA116PAG4 is a monolithic FET-input instrumentation amplifier produced by Texas Instruments. It is part of the INA116 series, known for its extremely low input bias current and high precision. This amplifier features Difet® inputs and special guarding techniques, which result in input bias currents as low as 3fA at 25°C and 25fA at 85°C. The INA116PAG4 is available in a 16-pin SOIC (Small Outline Integrated Circuit) package and is specified for 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 | ±5 | 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 | ±1.4 | mA |
| Safe Input Voltage | ±40 | V | |||
| Bandwidth, –3dB | G = 1 | 800 | kHz | ||
| Slew Rate | G = 10 to 200 | 0.8 | V/µs | ||
| Power Supply Voltage Range | ±4.5 | ±18 | V | ||
| Operating Temperature Range | –40 | 85 | °C |
Key Features
- Low Input Bias Current: 3fA at 25°C and 25fA at 85°C.
- Buffered Guard Drive Pins: Helps in maintaining low input bias current by driving circuit board and input cable guards.
- Low Offset Voltage: ±2mV maximum.
- High Common-Mode Rejection: Up to 94dB at G = 1000.
- Low Quiescent Current: 1.4mA maximum.
- Input Over-Voltage Protection: ±40V safe input voltage.
- Gain Flexibility: Gain can be set from 1 to 1000 using a single external resistor.
Applications
- Laboratory Instrumentation: Ideal for precision measurement instruments.
- pH Measurement: Suitable for high-accuracy pH measurement systems.
- Ion-Specific Probes: Used in ion-specific probe applications requiring low noise and high precision.
- Leakage Current Measurement: Excellent for measuring very low currents due to its low input bias current.
Q & A
- What is the typical input bias current of the INA116PAG4 at 25°C?
The typical input bias current is 3fA at 25°C. - What is the maximum offset voltage of the INA116PAG4?
The maximum offset voltage is ±5mV. - How is the gain of the INA116PAG4 set?
The gain is set by connecting a single external resistor, RG, according to the gain equation G = 1 + 50kΩ/RG. - What is the common-mode rejection ratio (CMRR) of the INA116PAG4 at G = 10?
The CMRR is up to 92dB at G = 10. - What is the safe input voltage range for the INA116PAG4?
The safe input voltage range is ±40V. - What is the quiescent current of the INA116PAG4?
The quiescent current is up to 1.4mA. - What are the typical applications of the INA116PAG4?
Typical applications include laboratory instrumentation, pH measurement, ion-specific probes, and leakage current measurement. - What is the operating temperature range of the INA116PAG4?
The operating temperature range is –40°C to +85°C. - How does the INA116PAG4 protect against input over-voltage?
The INA116PAG4 has built-in input over-voltage protection up to ±40V. - What package types are available for the INA116PAG4?
The INA116PAG4 is available in a 16-pin SOIC package.
