Overview
The ADA4522-4ARUZ from Analog Devices Inc. is a quad-channel, zero-drift operational amplifier (op amp) designed for high accuracy and low noise performance. These op amps feature ground sensing inputs and rail-to-rail output, making them suitable for a wide range of applications requiring precise signal amplification. The ADA4522-4 operates over a broad voltage range of 4.5 V to 55 V, supporting single-ended supplies of 5 V, 10 V, 12 V, and 30 V. This device is optimized for total accuracy over time, temperature, and voltage conditions, with high open-loop gain and very low DC and AC errors.
Key Specifications
| Parameter | Symbol | Test Conditions/Comments | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Offset Voltage | VOS | VCM = VSY/2, TA = 25°C | 0.7 | 5 | 6.5 | μV |
| Offset Voltage Drift | TCVOS | −40°C ≤ TA ≤ +125°C | 2.5 | 15 | nV/°C | |
| Input Bias Current | IB | −40°C ≤ TA ≤ +85°C | 50 | 150 | 500 | pA |
| Input Offset Current | IOS | −40°C ≤ TA ≤ +85°C | 80 | 250 | 350 | pA |
| Input Voltage Range | IVR | VCM = 0 V to 3.5 V | 0 | 3.5 | V | |
| Common-Mode Rejection Ratio | CMRR | VCM = 0 V to 3.5 V | 135 | 155 | dB | |
| Output Voltage High | VOH | RL = 10 kΩ to VSY/2, VSY = 5.0 V | 4.87 | 4.89 | 4.80 | V |
| Output Voltage Low | VOL | RL = 10 kΩ to VSY/2, VSY = 5.0 V | 110 | 130 | 200 | mV |
| Continuous Output Current | IOUT | Dropout voltage = 1 V | 14 | mA | ||
| Power Supply Rejection Ratio | PSRR | VSY = 4.5 V to 55 V, −40°C ≤ TA ≤ +125°C | 150 | 160 | 145 | dB |
| Supply Current per Amplifier | ISY | IOUT = 0 mA, −40°C ≤ TA ≤ +125°C | 830 | 900 | 950 | μA |
Key Features
- Zero Drift: The ADA4522-4 features zero-drift architecture, ensuring minimal offset voltage drift over temperature and time.
- Low Noise: These op amps exhibit a flat noise spectrum density at lower frequencies and are optimized for low noise performance.
- Rail-to-Rail Output: The ADA4522-4 provides rail-to-rail output, allowing the output voltage to swing close to the supply rails.
- Ground Sensing Inputs: The op amps have ground sensing inputs, which is beneficial for applications requiring input signals near ground potential.
- High Open-Loop Gain: The devices offer high open-loop gain, making them suitable for accurately amplifying small input signals.
- Low Power Consumption: The ADA4522-4 has low power consumption, with a supply current per amplifier of 830 μA to 950 μA.
- Broad Operating Voltage Range: The op amps operate over a wide voltage range of 4.5 V to 55 V, supporting various single-ended supply voltages.
Applications
- Load Cell/Strain Gage Sensor Signal Conditioning: The ADA4522-4 is well-suited for signal conditioning in weigh scales and load cells due to its low offset, drift, and noise characteristics.
- Precision Low-Side Current Shunt Sensors: These op amps are used in low-side current sensing circuits where high accuracy and low offset voltage are critical.
- Instrumentation Amplifiers: The ADA4522-4 can be configured as discrete instrumentation or difference amplifiers in various measurement systems.
- General Purpose Amplification: The devices are suitable for general-purpose amplification in applications requiring high accuracy and low noise.
Q & A
- What is the operating voltage range of the ADA4522-4?
The ADA4522-4 operates over a voltage range of 4.5 V to 55 V.
- What are the key features of the ADA4522-4?
The key features include zero drift, low noise, rail-to-rail output, ground sensing inputs, and high open-loop gain.
- What is the typical offset voltage of the ADA4522-4?
The typical offset voltage is 5 μV at VCM = VSY/2 and TA = 25°C.
- How does the ADA4522-4 perform in terms of noise?
The ADA4522-4 exhibits a flat noise spectrum density at lower frequencies and has specific noise peaks at higher frequencies, which are mitigated by the offset and ripple correction loop.
- What is the common-mode rejection ratio (CMRR) of the ADA4522-4?
The CMRR is typically 155 dB for VCM = 0 V to 3.5 V.
- What are some typical applications of the ADA4522-4?
Typical applications include load cell/strain gage sensor signal conditioning, precision low-side current shunt sensors, and instrumentation amplifiers.
- How much current does the ADA4522-4 typically consume per amplifier?
The supply current per amplifier is typically 830 μA to 950 μA.
- What is the output voltage range of the ADA4522-4?
The output voltage can swing close to the supply rails, with VOH and VOL specified for different load conditions.
- How should unused channels of the ADA4522-4 be configured?
Unused channels must be configured in unity gain with the input common-mode voltage tied to the midpoint of the power supplies.
- What is the thermal shutdown feature of the ADA4522-4?
The ADA4522-4 includes a thermal shutdown feature to protect the device from overheating.
