Overview
The OP295GS, produced by Analog Devices Inc., is a dual CBCMOS operational amplifier known for its high accuracy and rail-to-rail output swing. This amplifier is designed to operate in single-supply configurations, making it suitable for a variety of applications, including those using 3.3 V systems such as lithium batteries. The OP295GS combines the benefits of bipolar and CMOS technologies, offering lower noise and higher accuracy compared to traditional CMOS designs. It is particularly useful in applications requiring high dc accuracy and the ability to drive both inductive and capacitive loads efficiently.
Key Specifications
| Parameter | Symbol | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Offset Voltage | VOS | Vs = 5 V | - | - | 300 μV | μV |
| Open-Loop Gain | AVO | RL = 10 kΩ | 1000 | - | - | V/mV |
| Supply Current per Amplifier | ISY | VOUT = 1.5 V, RL = ∞, -40°C ≤ TA ≤ +125°C | - | - | 150 μA | μA |
| Output Voltage Swing High | VOH | RL = 10 kΩ to GND | - | - | 2.9 V | V |
| Output Voltage Swing Low | VOL | RL = 10 kΩ to GND | - | - | 0.7 mV | mV |
| Power Supply Rejection Ratio | PSRR | ±1.5 V ≤ VS ≤ ±15 V, -40°C ≤ TA ≤ +125°C | 85 | - | - | dB |
| Common-Mode Rejection Ratio | CMRR | -15.0 V ≤ VCM ≤ +13.5 V, -40°C ≤ TA ≤ +125°C | 90 | - | - | dB |
| Input Offset Current | IOS | VCM = 0 V, -40°C ≤ TA ≤ +125°C | - | - | ±5 nA | nA |
| Input Voltage Range | VCM | - | -15 | - | +13.5 | V |
Key Features
- Rail-to-Rail Output Swing: The OP295GS can swing its output voltage from near the negative supply to within about 800 mV of the positive supply, making it ideal for single-supply designs.
- High DC Accuracy: With a maximum offset voltage of 300 μV and an open-loop gain of at least 1000 V/mV, this amplifier offers high accuracy for precision applications.
- Low Noise and High Accuracy: The use of a bipolar front end provides lower noise and higher accuracy compared to traditional CMOS designs.
- Zero-In/Zero-Out Capability: Both input and output ranges include the negative supply, allowing for zero-in/zero-out operation.
- Stability with Capacitive Loads: The OP295GS is stable with loads in excess of 300 pF, making it suitable for driving coax cable or large FET transistors.
- High Efficiency in Driving Loads: It can supply up to 15 mA to the load, making it ideal for driving power transistors and H bridges, and increasing efficiency in applications such as transformers.
Applications
- Battery-Operated Instrumentation: Suitable for systems using 3.3 V or other low-voltage supplies, such as lithium batteries.
- Servo Amplifiers and Actuator Drives: The high accuracy and rail-to-rail output swing make it ideal for servo control and actuator drive applications.
- Sensor Conditioners: Used in sensor conditioning circuits where high accuracy and low noise are critical.
- Power Supply Control: Can be used to control power supplies and to gain up low voltage references for high-resolution ADCs.
- Driving Inductive and Capacitive Loads: Stable with both inductive and capacitive loads, making it suitable for a wide range of applications.
Q & A
- What is the maximum offset voltage of the OP295GS?
The maximum offset voltage of the OP295GS is specified at 300 μV for 5 V operation.
- What is the open-loop gain of the OP295GS?
The open-loop gain of the OP295GS is a minimum of 1000 V/mV.
- What is the supply current per amplifier for the OP295GS?
The supply current per amplifier for the OP295GS is a maximum of 150 μA.
- What is the output voltage swing range of the OP295GS?
The output voltage swing range of the OP295GS extends from near the negative supply to within about 800 mV of the positive supply.
- Is the OP295GS stable with capacitive loads?
Yes, the OP295GS is stable with loads in excess of 300 pF.
- What are the typical applications of the OP295GS?
The OP295GS is typically used in battery-operated instrumentation, servo amplifiers, actuator drives, sensor conditioners, and power supply control.
- Can the OP295GS be used in single-supply designs?
Yes, the OP295GS is suitable for single-supply designs and can operate in 3 V systems such as those using lithium batteries.
- What is the common-mode rejection ratio (CMRR) of the OP295GS?
The CMRR of the OP295GS is typically 90 dB over the specified temperature range.
- What is the power supply rejection ratio (PSRR) of the OP295GS?
The PSRR of the OP295GS is typically 85 dB over the specified temperature range.
- In what packages is the OP295GS available?
The OP295GS is available in 8-lead PDIP and 8-lead SOIC_N surface-mount packages.
