Overview
The INA146, produced by Texas Instruments, is a precision difference amplifier designed to accurately attenuate high differential voltages and reject high common-mode voltages. This makes it compatible with common signal processing voltage levels. The amplifier features high-voltage capability, allowing it to handle input voltages up to ±100 V, and it provides inherent input protection. The INA146 is suitable for both single and dual supply applications, with a wide supply range from 4.5 V to 36 V for single supply and ±2.25 V to ±18 V for dual supplies. It operates within an extended industrial temperature range of –40°C to 85°C and is available in an SO-8 surface-mount package.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (Single) | 4.5 | 36 | V | |
| Supply Voltage (Dual) | ±2.25 | ±18 | V | |
| Input Common-Mode Voltage | -25 | 19 | V | |
| Differential Gain | 0.1 | 100 | V/V | |
| Quiescent Current | 570 | 750 | µA | |
| Common-Mode Rejection Ratio (CMRR) | 70 | 80 | dB | |
| Gain Error | ±0.025 | ±0.1 | % | |
| Bandwidth (-3 dB) | 50 | 550 | kHz | |
| Slew Rate | 0.3 | V/µs | ||
| Operating Temperature | -40 | 85 | °C |
Key Features
- High common-mode voltage handling: up to 40 V at VS = 5 V and ±100 V at VS = ±15 V
- Differential gain adjustable from 0.1 V/V to 100 V/V using external resistors
- Low quiescent current: 570 µA
- Wide supply range: single supply from 4.5 V to 36 V and dual supplies from ±2.25 V to ±18 V
- Low gain error: ±0.025%
- High common-mode rejection ratio (CMRR): up to 80 dB
- On-chip precision resistors laser-trimmed for accurate gain and high CMRR
- Excellent temperature coefficient resistance (TCR) tracking for high precision over temperature
Applications
- Battery cell formation and test equipment
- AC drive control modules
- HVAC controllers
- Professional audio amplifiers (rack mount)
- Programmable DC power sources
- Data acquisition (DAQ) systems
Q & A
- What is the INA146 used for?
The INA146 is a precision difference amplifier used to accurately attenuate high differential voltages and reject high common-mode voltages, making it compatible with common signal processing voltage levels.
- What is the input common-mode voltage range of the INA146?
The input common-mode voltage range extends beyond both supply rails, up to -25 V to 19 V.
- How is the gain of the INA146 set?
The gain of the INA146 is set using two external resistors, RG1 and RG2, according to the equation: G = 0.1 × (1 + RG2/RG1).
- What is the quiescent current of the INA146?
The quiescent current of the INA146 is approximately 570 µA.
- What is the common-mode rejection ratio (CMRR) of the INA146?
The CMRR of the INA146 is up to 80 dB.
- What are the operating temperature ranges for the INA146?
The INA146 operates within an extended industrial temperature range of –40°C to 85°C.
- What package types are available for the INA146?
The INA146 is available in an SO-8 surface-mount package.
- What are some typical applications of the INA146?
Typical applications include battery cell formation and test equipment, AC drive control modules, HVAC controllers, professional audio amplifiers, programmable DC power sources, and data acquisition (DAQ) systems.
- How does the INA146 handle high differential voltages?
The INA146 can handle high differential voltages up to ±100 V and provides inherent input protection due to its high-voltage capability.
- What is the bandwidth of the INA146?
The bandwidth of the INA146 is up to 550 kHz for a gain of 0.1 and 50 kHz for a gain of 1.
