Overview
The PGA280, produced by Texas Instruments, is a high-precision instrumentation amplifier designed with digitally-controllable gain and advanced signal integrity test capabilities. This device is renowned for its low offset voltage, near-zero offset and gain drift, and excellent linearity. It utilizes modern chopper technology with internal filters to minimize noise and ensure superior common-mode and supply rejection, making it ideal for high-resolution precision measurements.
The PGA280 features a wide input range of ±15.5 V at ±18-V supply and supports binary gain steps from 128 V/V to 1/8 V/V, along with additional scaling factors. Its high input impedance, very low 1/f noise, and differential signal output make it versatile for various applications.
Key Specifications
| Parameter | Test Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply Voltage (VSN to VSP) | 40 | V | |||
| Signal Input Terminals Voltage | VSN – 0.5 to VSP + 0.5 | V | |||
| Gain Bandwidth Product (GBP) | G > 4 | 6 | MHz | ||
| Slew Rate (SR) | G = 1, CL = 100 pF, BUF On | 1 | V/μs | ||
| Offset Voltage | G = 128 | 3 | μV | ||
| Common-Mode Rejection Ratio (CMRR) | 140 | dB | |||
| Operating Temperature | –40 | 105 | °C | ||
| Quiescent Current (IQ) - Input Stage | TA = –40°C to +105°C | 2.1 | 3 | mA | |
| Quiescent Current (IQ) - Output Stage | TA = –40°C to +105°C | 0.75 | 1 | mA | |
| Quiescent Current (IQ) - Digital | Static condition, no external load, DVDD = 3 V, TA = –40°C to +105°C | 0.07 | 0.13 | mA |
Key Features
- Wide input range: ±15.5 V at ±18-V supply
- Binary gain steps: 128 V/V to 1/8 V/V with additional scaling factors of 1 V/V and 1⅜ V/V
- Low offset voltage: 3 μV at G = 128
- Near-zero long-term drift of offset voltage and gain drift: 0.5 ppm/°C
- Excellent linearity: 1.5 ppm
- Excellent CMRR: 140 dB
- High input impedance
- Very low 1/f noise
- Differential signal output
- Overload detection
- Input configuration switch matrix
- Wire break test current
- Expandable SPI with checksum
- General-purpose I/O port
- TSSOP-24 package
Applications
- Analog input module
- Data acquisition (DAQ)
- Aircraft engine control
- Battery test
Q & A
- What is the PGA280's input voltage range?
The PGA280 has a wide input range of ±15.5 V at ±18-V supply.
- What are the gain steps available on the PGA280?
The PGA280 offers binary gain steps from 128 V/V to 1/8 V/V, along with additional scaling factors of 1 V/V and 1⅜ V/V.
- What is the offset voltage of the PGA280 at a gain of 128?
The offset voltage is 3 μV at a gain of 128.
- What is the common-mode rejection ratio (CMRR) of the PGA280?
The CMRR is 140 dB.
- Does the PGA280 support SPI communication?
Yes, the PGA280 supports expandable SPI with checksum.
- What is the package type of the PGA280?
The PGA280 is available in a TSSOP-24 package.
- What are the operating temperature ranges for the PGA280?
The operating temperature range is from –40°C to +105°C.
- Does the PGA280 have general-purpose I/O ports?
Yes, the PGA280 has a general-purpose I/O port.
- What are some typical applications of the PGA280?
Typical applications include analog input modules, data acquisition (DAQ), aircraft engine control, and battery testing.
- How does the PGA280 handle overload conditions?
The PGA280 has built-in overload detection and indicates overload conditions.
