Overview
The PGA112AIDGST is a precision programmable gain amplifier (PGA) produced by Texas Instruments. This device is part of the PGA112 and PGA113 series, offering advanced features such as zero-drift, low noise, and programmable gain. It is packaged in a 10-pin VSSOP (DGS) package, making it suitable for a variety of applications requiring high precision and flexibility.
The PGA112AIDGST is designed to provide high accuracy with a typical offset of 25 µV and a maximum offset of 100 µV. It also features a zero-drift characteristic of 0.35 µV/°C (typical) and 1.2 µV/°C (maximum), ensuring stable performance over a wide temperature range.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package Type | VSSOP-10 | |
| Pins | 10 | |
| Operating Temperature Range | -40 to 125 | °C |
| Supply Voltage | 2.2 to 5.5 | V |
| Offset Voltage | 25 µV (Typical), 100 µV (Maximum) | µV |
| Zero Drift | 0.35 µV/°C (Typical), 1.2 µV/°C (Maximum) | µV/°C |
| Noise | 12 nV/√Hz | nV/√Hz |
| Input Offset Current | ±5 nA (Maximum at 25°C) | nA |
| Gain Error | 0.1% (Maximum for G ≤ 32), 0.3% (Maximum for G > 32) | % |
| Binary Gains | 1, 2, 4, 8, 16, 32, 64, 128 | |
| Gain Switching Time | 200 ns | ns |
| Number of Analog Inputs | 2 | |
| MUX Channels | 2 Channel MUX | |
| Internal Calibration Channels | Four | |
| Output Swing | 50 mV to Supply Rails | mV |
| Quiescent Current (Analog) | 1.1 mA (Typical) | mA |
| Shutdown Current | ≤ 4 µA (Typical) | µA |
| SPI Interface | 10 MHz with Daisy-Chain Capability |
Key Features
- Rail-to-Rail Input and Output: Ensures maximum signal range utilization.
- Zero Drift: Maintains stability over temperature changes with a typical drift of 0.35 µV/°C.
- Low Noise: Features a low noise level of 12 nV/√Hz, ideal for high-precision applications.
- Programmable Gain: Offers binary gains of 1, 2, 4, 8, 16, 32, 64, and 128.
- Gain Switching Time: Fast gain switching time of 200 ns.
- 2 Channel MUX: Allows selection between two analog input channels.
- Internal Calibration Channels: Four internal channels for system-level calibration.
- Amplifier Optimized for Driving CDAC ADCs: Designed to drive Capacitor Digital-to-Analog Converters (CDAC) ADCs efficiently.
- Output Swing: Output voltage swing from 50 mV to the supply rails.
- Mixed Voltage Systems Support: Separate AVDD and DVDD for mixed voltage systems.
- Low Quiescent Current: Typical quiescent current of 1.1 mA.
- Software and Hardware Shutdown: Low shutdown current of ≤ 4 µA (typical).
- SPI Interface with Daisy-Chain Capability: Supports SPI interface at 10 MHz with daisy-chain capability.
Applications
- Portable Data Acquisition Systems: Ideal for battery-powered and handheld data acquisition systems.
- PC-Based Signal Acquisition Systems: Suitable for PC-based systems requiring high precision and programmable gain.
- Test and Measurement Equipment: Used in various test and measurement instruments due to its high accuracy and low noise.
- Programmable Logic Controllers (PLCs): Can be integrated into PLCs for industrial automation applications.
- Battery-Powered Instruments: Suitable for battery-powered devices requiring low power consumption and high precision.
- Handheld Test Equipment: Ideal for handheld test equipment due to its compact size and low power consumption.
Q & A
- What is the typical offset voltage of the PGA112AIDGST?
The typical offset voltage is 25 µV, with a maximum of 100 µV.
- What is the zero-drift characteristic of the PGA112AIDGST?
The zero-drift is 0.35 µV/°C (typical) and 1.2 µV/°C (maximum).
- What is the noise level of the PGA112AIDGST?
The noise level is 12 nV/√Hz.
- What are the available binary gains for the PGA112AIDGST?
The available binary gains are 1, 2, 4, 8, 16, 32, 64, and 128.
- How many analog input channels does the PGA112AIDGST have?
The PGA112AIDGST has two analog input channels with a 2-channel MUX.
- What is the gain switching time of the PGA112AIDGST?
The gain switching time is 200 ns.
- Does the PGA112AIDGST support mixed voltage systems?
Yes, it supports mixed voltage systems with separate AVDD and DVDD.
- What is the typical quiescent current of the PGA112AIDGST?
The typical quiescent current is 1.1 mA.
- How does the PGA112AIDGST handle shutdown?
The device supports both software and hardware shutdown with a shutdown current of ≤ 4 µA (typical).
- What is the operating temperature range of the PGA112AIDGST?
The operating temperature range is -40°C to 125°C.
