Overview
The PGA281AIPW, produced by Texas Instruments, is a high-precision instrumentation amplifier designed with digitally-controllable gain and signal-integrity test capability. This device utilizes proprietary autozeroing techniques to achieve low offset voltage, near-zero offset and gain drift, and excellent linearity. It is optimized for high-resolution, precise measurements with superior common-mode rejection and supply rejection. The PGA281AIPW is available in a TSSOP-16 package and is specified over a temperature range of –40°C to +105°C, making it suitable for a wide variety of applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VSN to VSP) | 40 | V | ||
| Input Voltage Range (VSN to VSP) | –15.5 | +15.5 | V | |
| Input Impedance | >1 GΩ | |||
| Offset Voltage (RTI) | ±(5 + 45/G) | ±(20 + 235/G) | μV | |
| Gain Range | ⅛ | 128 | V/V | |
| Common-Mode Rejection Ratio (CMRR) | 110 | 130 | dB | |
| Operating Temperature Range | –40 | +105 | °C | |
| Package Type | TSSOP-16 |
Key Features
- Wide Input Range: ±15.5 V at ±18 V supply.
- Binary Gain Steps: From ⅛ V/V (attenuation) to 128 V/V.
- Low Offset Voltage: 5 μV at G = 128.
- Near-Zero Long-Term Drift of Offset Voltage: Excellent stability over time.
- Near-Zero Gain Drift: 0.5 ppm/°C.
- Excellent Linearity: 1.5 ppm.
- High Input Impedance: Greater than 1 GΩ.
- Very Low 1/f Noise: Minimized chopper-related noise.
- Differential Signal Output: Fully differential, rail-to-rail output.
- Overload Detection: Built-in error flag for signal integrity.
Applications
- High-Precision Signal Instrumentation: Ideal for precise signal measurement and conditioning.
- Multiplexed Data Acquisition: Suitable for multi-channel data acquisition systems.
- Medical Instrumentation: Used in medical devices requiring high precision and low noise.
- Test and Measurement Equipment: Enhances the accuracy of test and measurement instruments.
- Differential or Single-Ended ADC Drivers: Interfaces with analog-to-digital converters (ADCs).
- Strain Gauge Amplifiers: Used in industrial process control and strain gauge applications.
Q & A
- What is the PGA281AIPW's input voltage range?
The PGA281AIPW has an input voltage range of ±15.5 V at ±18 V supply.
- What are the binary gain steps of the PGA281AIPW?
The gain steps range from ⅛ V/V (attenuation) to 128 V/V.
- What is the typical offset voltage of the PGA281AIPW?
The typical offset voltage is 5 μV at a gain of 128 V/V.
- How does the PGA281AIPW handle common-mode rejection?
The device offers a common-mode rejection ratio (CMRR) of greater than 110 dB.
- What is the operating temperature range of the PGA281AIPW?
The operating temperature range is –40°C to +105°C.
- What package type is the PGA281AIPW available in?
The PGA281AIPW is available in a TSSOP-16 package.
- Does the PGA281AIPW have built-in overload detection?
Yes, it has an error flag for signal integrity and overload detection.
- What are some common applications of the PGA281AIPW?
Common applications include high-precision signal instrumentation, medical instrumentation, test and measurement equipment, and differential or single-ended ADC drivers.
- How does the PGA281AIPW minimize noise?
The device uses modern chopper technology with internal filters to minimize chopper-related noise.
- What is the input impedance of the PGA281AIPW?
The input impedance is greater than 1 GΩ.
