Overview
The PGA112AIDGSR is a zero-drift, programmable gain amplifier (PGA) produced by Texas Instruments. This device is part of the PGA112 series, which includes models with binary and scope gains. The PGA112AIDGSR is housed in a 10-pin VSSOP (DGS) package and features a two-channel multiplexer (MUX) along with a three-pin SPI interface. It is designed for high precision and low noise applications, making it suitable for various signal acquisition and processing tasks.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | VSSOP (DGS) | - |
| Pins | 10 | - |
| Operating Temperature Range | -40 to 125 | °C |
| Supply Voltage | 2.2 to 5.5 | V |
| Offset Voltage | 25 µV (Typ), 100 µV (Max) | µV |
| Zero Drift | 0.35 µV/°C (Typ), 1.2 µV/°C (Max) | µV/°C |
| Noise | 12 nV/√Hz | nV/√Hz |
| Input Offset Current | ±5 nA (Max at 25°C) | nA |
| Gain Error | 0.1% (Max for G ≤ 32), 0.3% (Max for G > 32) | % |
| Binary Gains | 1, 2, 4, 8, 16, 32, 64, 128 | - |
| Gain Switching Time | 200 ns | ns |
| MUX Channels | 2 | - |
| Internal Calibration Channels | 4 | - |
| Output Swing | 50 mV to Supply Rails | mV |
| Quiescent Current (IQ) | 1.1 mA (Typical) | mA |
| Shutdown Current (IQ) | ≤ 4 µA (Typical) | µA |
| SPI Interface Frequency | 10 MHz | MHz |
Key Features
- Rail-to-Rail Input and Output: Ensures full utilization of the supply voltage range.
- Low Offset and Zero Drift: Offset of 25 µV (typical) and zero drift of 0.35 µV/°C (typical), ensuring high precision over temperature.
- Low Noise: 12 nV/√Hz noise level, suitable for high-sensitivity applications.
- Programmable Gains: Binary gains of 1, 2, 4, 8, 16, 32, 64, and 128.
- Fast Gain Switching: Gain switching time of 200 ns.
- Two-Channel MUX: Allows selection between two analog input channels.
- Internal Calibration Channels: Four internal calibration channels for system-level calibration.
- Optimized for CDAC ADCs: Designed to drive CDAC (Charge-Domain Analog-to-Digital Converters) ADCs efficiently.
- Mixed Voltage Systems Support: Separate AVDD and DVDD for mixed voltage systems.
- Software and Hardware Shutdown: Low current shutdown mode with IQ ≤ 4 µA (typical).
- SPI Interface with Daisy-Chain Capability: Supports SPI interface at 10 MHz with daisy-chain capability.
Applications
- Portable Data Acquisition: Ideal for portable and battery-powered data acquisition systems due to its low power consumption and high precision.
- PC-Based Signal Acquisition Systems: Suitable for PC-based systems requiring high accuracy and low noise.
- Test and Measurement: Used in various test and measurement equipment where precision and low noise are critical.
- Programmable Logic Controllers (PLCs): Can be integrated into PLCs for industrial automation applications.
- Handheld Test Equipment: Suitable for handheld test equipment due to its compact size and low power consumption.
- Battery-Powered Instruments: Ideal for battery-powered instruments requiring high precision and low noise.
Q & A
- What is the typical offset voltage of the PGA112AIDGSR?
The typical offset voltage is 25 µV, with a maximum of 100 µV.
- What are the available binary gains for the PGA112AIDGSR?
The available binary gains are 1, 2, 4, 8, 16, 32, 64, and 128.
- What is the noise level of the PGA112AIDGSR?
The noise level is 12 nV/√Hz.
- How many MUX channels does the PGA112AIDGSR have?
The PGA112AIDGSR has a two-channel MUX.
- What is the gain switching time of the PGA112AIDGSR?
The gain switching time is 200 ns.
- Does the PGA112AIDGSR support mixed voltage systems?
Yes, it supports mixed voltage systems with separate AVDD and DVDD.
- What is the typical quiescent current (IQ) of the PGA112AIDGSR?
The typical quiescent current (IQ) is 1.1 mA.
- What is the shutdown current of the PGA112AIDGSR?
The shutdown current is ≤ 4 µA (typical).
- What is the operating temperature range of the PGA112AIDGSR?
The operating temperature range is -40°C to 125°C.
- Does the PGA112AIDGSR have an SPI interface?
Yes, it has an SPI interface with a frequency of up to 10 MHz and daisy-chain capability.
