Overview
The PGA205AU is a programmable-gain instrumentation amplifier produced by Texas Instruments. It is part of the PGA204 and PGA205 series, known for their low cost, high accuracy, and versatility. These amplifiers are designed for a wide range of applications, offering digitally selectable gains of 1, 2, 4, and 8 V/V. The PGA205AU is laser trimmed to achieve very low offset voltage (50µV), low offset voltage drift (0.25µV/°C), and high common-mode rejection (115dB at G=1000). It operates with power supplies as low as ±4.5V, making it suitable for battery-operated systems.
Key Specifications
| Parameter | Value | Units |
|---|---|---|
| Package | SOIC (DW) | - |
| Pins | 16 | - |
| Operating Temperature Range | -40 to 85 | °C |
| Gain | 1, 2, 4, 8 V/V | - |
| Offset Voltage | 50µV max | µV |
| Offset Voltage Drift | 0.25µV/°C | µV/°C |
| Input Bias Current | 2nA max | nA |
| Quiescent Current | 5.2mA typ | mA |
| Power Supply Voltage | ±4.5 to ±18V | V |
| Common-Mode Rejection | 115dB at G=1000 | dB |
| Safe Input Voltage | ±40V | V |
Key Features
- Digitally programmable gain: 1, 2, 4, 8 V/V
- Low offset voltage: 50µV max
- Low offset voltage drift: 0.25µV/°C
- Low input bias current: 2nA max
- Low quiescent current: 5.2mA typ
- No logic supply required
- 16-pin plastic DIP and SOL-16 surface-mount packages
- Internal input protection up to ±40V
- High common-mode rejection: 115dB at G=1000
Applications
- Data acquisition systems
- General purpose analog boards
- Medical instrumentation
Q & A
- What are the available gain settings for the PGA205AU?
The PGA205AU offers digitally selectable gains of 1, 2, 4, and 8 V/V.
- What is the maximum offset voltage of the PGA205AU?
The maximum offset voltage is 50µV.
- What is the operating temperature range of the PGA205AU?
The operating temperature range is -40°C to 85°C.
- What is the quiescent current of the PGA205AU?
The quiescent current is typically 5.2mA.
- Does the PGA205AU require a separate logic supply?
No, the PGA205AU does not require a separate logic supply.
- What types of packages are available for the PGA205AU?
The PGA205AU is available in 16-pin plastic DIP and SOL-16 surface-mount packages.
- What is the common-mode rejection ratio of the PGA205AU at a gain of 1000?
The common-mode rejection ratio is 115dB at a gain of 1000.
- How is the gain selected on the PGA205AU?
The gain is selected using two TTL or CMOS-compatible address lines, A0 and A1.
- What is the safe input voltage range for the PGA205AU?
The safe input voltage range is up to ±40V.
- What are some typical applications of the PGA205AU?
Typical applications include data acquisition systems, general purpose analog boards, and medical instrumentation.
