Overview
The OP295GPZ, produced by Analog Devices Inc., is a dual rail-to-rail operational amplifier designed for high accuracy and low power consumption. It features a bipolar front end, which provides lower noise and higher accuracy compared to CMOS designs. This amplifier is particularly suited for applications requiring high dc accuracy and rail-to-rail output swing, making it ideal for battery-operated instrumentation, servo amplifiers, actuator drives, sensor conditioners, and power supply control.
Key Specifications
| Parameter | Symbol | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Offset Voltage | VOS | VS = 5 V | - | - | 300 | μV |
| Gain Bandwidth Product | - | - | - | - | 75 | kHz |
| 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 |
| Input Offset Current | IOS | VCM = 0 V, −40°C ≤ TA ≤ +125°C | - | - | ±5 | nA |
| Common-Mode Rejection Ratio | CMRR | −15.0 V ≤ VCM ≤ +13.5 V, −40°C ≤ TA ≤ +125°C | 90 | - | 110 | dB |
| Output Voltage Swing High | VOH | RL = 10 kΩ to GND | - | - | 2.9 | V |
| Output Voltage Swing Low | VOL | RL = 10 kΩ to GND | - | - | 0.7 | mV |
Key Features
- Rail-to-rail output swing, allowing the output to extend from the negative supply to within about 800 mV of the positive supply.
- Low offset voltage of 300 μV for 5 V operation.
- High open-loop gain of at least 1000 V/mV.
- Low supply current per amplifier of 150 μA maximum.
- High common-mode rejection ratio (CMRR) of 90 dB to 110 dB.
- Stability with capacitive loads, making it suitable for driving coax cable or large FET transistors.
- Ability to drive inductive loads efficiently, such as transformers.
Applications
- Battery-operated instrumentation.
- Servo amplifiers.
- Actuator drives.
- Sensor conditioners.
- Power supply control.
- Buffer applications where high accuracy and rail-to-rail output swing are required.
- Driving power transistors and H bridges.
Q & A
- What is the maximum offset voltage of the OP295GPZ?
The maximum offset voltage is specified at 300 μV for 5 V operation. - What is the gain bandwidth product of the OP295GPZ?
The gain bandwidth product is 75 kHz. - What is the open-loop gain of the OP295GPZ?
The open-loop gain is a minimum of 1000 V/mV. - How much current does the OP295GPZ draw from the supply per amplifier?
The supply current per amplifier is a maximum of 150 μA. - Is the OP295GPZ stable with capacitive loads?
Yes, the OP295GPZ is stable with loads in excess of 300 pF. - What are some common applications of the OP295GPZ?
Common applications include battery-operated instrumentation, servo amplifiers, actuator drives, sensor conditioners, and power supply control. - Can the OP295GPZ drive inductive loads efficiently?
Yes, the OP295GPZ can drive inductive loads efficiently, such as transformers. - What is the common-mode rejection ratio (CMRR) of the OP295GPZ?
The CMRR is between 90 dB and 110 dB. - How does the OP295GPZ handle rail-to-rail output swing?
The OP295GPZ features rail-to-rail output swing, allowing the output to extend from the negative supply to within about 800 mV of the positive supply. - Can the OP295GPZ be used in buffer applications?
Yes, but it requires a minimal amount of gain to maintain linearity when rail-to-rail output swing is desired.
