Overview
The PGA280, produced by Texas Instruments, is a high-precision instrumentation amplifier that features digitally-controllable gain and signal integrity test capability. This device is designed to offer low offset voltage, near-zero long-term drift of offset and gain, excellent linearity, and superior common-mode and supply rejection. It supports high-resolution precision measurement with a wide, high-impedance input range and operates over a specified temperature range of –40°C to +105°C. The PGA280 is available in a TSSOP-24 package and is suitable for various applications requiring precise signal amplification and system-level diagnostics.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Range | ±15.5 V | V |
| Gain Range | ⅛ to 128 V/V | V/V |
| Offset Voltage | 3 μV (G = 128) | μV |
| Gain Drift | 0.5 ppm/°C | ppm/°C |
| Linearity | 1.5 ppm | ppm |
| Common-Mode Rejection Ratio (CMRR) | 140 dB | dB |
| Input Impedance | > 1 GΩ | Ω |
| Supply Voltage Range | 10 to 36 V | V |
| Operating Temperature | –40°C to +105°C | °C |
| Package Type | TSSOP-24 |
Key Features
- Digitally-controllable gain with binary steps from ⅛ to 128 V/V and additional scaling factors of 1 V/V and 1⅜ V/V.
- Low offset voltage and near-zero long-term drift of offset and gain.
- Excellent linearity and common-mode rejection ratio (CMRR) of 140 dB.
- High input impedance and very low 1/f noise.
- Differential signal output and overload detection.
- Input configuration switch matrix and wire break test current.
- Expandable SPI interface with checksum and general-purpose I/O port.
Applications
- Analog input modules.
- Data acquisition (DAQ) systems.
- Aircraft engine control systems.
- Battery test and measurement systems).
Q & A
- What is the PGA280?
The PGA280 is a high-precision instrumentation amplifier with digitally-controllable gain and signal integrity test capability produced by Texas Instruments.
- What is the input range of the PGA280?
The PGA280 has an input range of ±15.5 V at ±18-V supply).
- What are the gain settings available on the PGA280?
The PGA280 offers gain settings from ⅛ to 128 V/V with additional scaling factors of 1 V/V and 1⅜ V/V).
- What is the offset voltage of the PGA280?
The offset voltage of the PGA280 is 3 μV at a gain of 128 V/V).
- What is the common-mode rejection ratio (CMRR) of the PGA280?
The CMRR of the PGA280 is 140 dB).
- What is the operating temperature range of the PGA280?
The PGA280 operates over a temperature range of –40°C to +105°C).
- What package type is the PGA280 available in?
The PGA280 is available in a TSSOP-24 package).
- What are some of the key applications of the PGA280?
The PGA280 is used in analog input modules, data acquisition systems, aircraft engine control, and battery test and measurement systems).
- Does the PGA280 have an SPI interface?
Yes, the PGA280 has an expandable SPI interface with checksum).
- What is the purpose of the input configuration switch matrix on the PGA280?
The input configuration switch matrix enables easy reconfiguration and system-level diagnostics, including overload condition indication).
