Overview
The AD8531ART-REEL, produced by Analog Devices Inc., is a single-supply, rail-to-rail input/output operational amplifier. This device is part of the AD8531/AD8532/AD8534 family, which includes single, dual, and quad configurations. The AD8531 is known for its high output drive current of ±250 mA, making it suitable for driving both resistive and capacitive loads. It operates over a supply voltage range of 2.7 V to 6 V and features low supply current, wide bandwidth, and a high slew rate.
The AD8531 is particularly useful in applications requiring low input bias currents and high stability, especially with heavy capacitive loads such as those found in LCD panels. Its rail-to-rail input and output capabilities and unity gain stability make it versatile for various electronic systems.
Key Specifications
| Parameter | Symbol | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Supply Voltage | V_S | 2.7 | 6 | V | ||
| Output Current | I_OUT | ±250 | mA | |||
| Bandwidth | 3 | MHz | ||||
| Slew Rate | SR | RL = 2 kΩ | 5 | V/μs | ||
| Supply Current per Amplifier | I_SY | VO = 0 V | 0.70 | 1 | 1.25 | mA |
| Input Bias Current | I_B | −40°C ≤ TA ≤ +85°C | 5 | 60 | pA | |
| Input Offset Current | I_OS | −40°C ≤ TA ≤ +85°C | 1 | 30 | pA | |
| Common-Mode Rejection Ratio | CMRR | V_CM = 0 V to 5 V | 38 | 45 | dB | |
| Operating Temperature Range | −40 | 85 | °C |
Key Features
- Single-Supply Operation: Operates from 2.7 V to 6 V supply voltage.
- High Output Current: ±250 mA output drive current, suitable for driving resistive and capacitive loads.
- Low Supply Current: Only 750 μA per amplifier at 5 V supply voltage.
- Wide Bandwidth and High Slew Rate: 3 MHz bandwidth and 5 V/μs slew rate.
- No Phase Reversal: Ensures stable operation without phase reversal.
- Low Input Currents: Very low input bias currents, making it suitable for integrators and diode amplification.
- Unity Gain Stable: Stable operation at unity gain.
- Rail-to-Rail Input and Output: Allows for full swing at both input and output stages.
Applications
- Multimedia Audio: Audio amplification for computers, sound ports, sound cards, and set-top boxes.
- LCD Drivers: Driving heavy capacitive loads such as those found in LCD panels.
- ASIC Input or Output Amplifiers: Buffering CMOS DACs, ASICs, or other wide output swing devices in single-supply systems.
- Headphone Drivers: Suitable for driving headphones due to its high output current and low distortion.
Q & A
- What is the supply voltage range for the AD8531?
The AD8531 operates from a supply voltage range of 2.7 V to 6 V.
- What is the output current capability of the AD8531?
The AD8531 has an output current drive capability of ±250 mA.
- What is the typical supply current per amplifier for the AD8531?
The typical supply current per amplifier is 750 μA at a 5 V supply voltage.
- What is the bandwidth and slew rate of the AD8531?
The AD8531 has a bandwidth of 3 MHz and a slew rate of 5 V/μs.
- Is the AD8531 stable at unity gain?
Yes, the AD8531 is unity gain stable.
- What are the typical applications of the AD8531?
Typical applications include multimedia audio, LCD drivers, ASIC input or output amplifiers, and headphone drivers.
- What is the operating temperature range for the AD8531?
The AD8531 operates over an extended industrial temperature range of −40°C to +85°C.
- Does the AD8531 have rail-to-rail input and output capabilities?
Yes, the AD8531 features rail-to-rail input and output capabilities.
- What is the common-mode rejection ratio (CMRR) of the AD8531?
The CMRR of the AD8531 is typically between 38 dB and 45 dB.
- Is the AD8531 suitable for driving heavy capacitive loads?
Yes, the AD8531 is very stable and capable of driving heavy capacitive loads such as those found in LCDs.
