Overview
The AD8508ARUZ-REEL, produced by Analog Devices Inc., is a quad operational amplifier designed for low-power, high-performance applications. It is part of the AD8505/AD8506/AD8508 family, which features single, dual, and quad micro-power amplifiers. These amplifiers are known for their rail-to-rail input/output swings and operate from a single 1.8 V to 5 V power supply or from dual ±0.9 V to ±2.5 V power supplies. The AD8508 is particularly suited for battery-powered applications due to its low supply current and high common-mode rejection ratio (CMRR), making it ideal for minimizing errors caused by power supply voltage variations over the battery's lifetime.
Key Specifications
| Parameter | Value | Conditions |
|---|---|---|
| Number of Amplifiers | 4 | - |
| Amplifier Type | CMOS | - |
| Output Type | Rail-to-Rail | - |
| Supply Voltage Range | 1.8 V to 5 V (single supply), ±0.9 V to ±2.5 V (dual supply) | - |
| Supply Current per Amplifier | 16.5 µA to 20 µA | VOUT = VSY/2, −40°C ≤ TA ≤ +125°C |
| Input Bias Current | 1 pA typical | - |
| Offset Voltage | 2.5 mV maximum | - |
| Voltage Noise Density | 45 nV/√Hz at 1 kHz | - |
| Slew Rate | 0.013 V/µs | RL = 100 kΩ |
| Power Supply Rejection Ratio (PSRR) | 100 dB to 110 dB | VSY = 1.8 V to 5 V, −40°C ≤ TA ≤ +85°C |
| Common-Mode Rejection Ratio (CMRR) | Excellent CMRR performance | - |
| Operating Temperature Range | −40°C to +125°C | - |
| Package Type | 14-lead TSSOP, 14-ball WLCSP | - |
Key Features
- Rail-to-Rail Input/Output Swings: The AD8508 offers full rail-to-rail input and output swings, enhancing its versatility in various applications.
- Low Power Consumption: With a supply current of less than 20 µA per amplifier, it is highly suitable for battery-powered devices.
- Zero Input Crossover Distortion: This feature ensures excellent performance in terms of power supply rejection ratio (PSRR) and common-mode rejection ratio (CMRR).
- Low Noise: The amplifier has a low voltage noise density of 45 nV/√Hz at 1 kHz, making it ideal for noise-sensitive applications.
- Low Input Bias Current: A typical input bias current of 1 pA minimizes errors in high-impedance circuits.
- Compact Packaging: Available in 14-lead TSSOP and 14-ball WLCSP packages, making it suitable for space-constrained designs.
Applications
- Pressure and Position Sensors: The low noise and high CMRR make it suitable for precision sensing applications.
- Remote Security and Bio Sensors: Ideal for battery-powered remote sensing applications due to its low power consumption.
- IR Thermometers: The low noise and high accuracy are beneficial for temperature measurement applications.
- Battery-Powered Consumer Equipment: Suitable for handheld devices and other consumer electronics that require low power consumption.
- Hazard Detectors: Used in smoke, fire, and gas detection systems where low power and high accuracy are crucial.
- Patient Monitors: The high CMRR and low noise make it suitable for medical monitoring devices.
Q & A
- What is the supply voltage range for the AD8508?
The AD8508 can operate from a single 1.8 V to 5 V power supply or from dual ±0.9 V to ±2.5 V power supplies.
- What is the typical supply current per amplifier for the AD8508?
The typical supply current per amplifier is 16.5 µA to 20 µA.
- What is the input bias current of the AD8508?
The input bias current is typically 1 pA.
- What is the voltage noise density of the AD8508 at 1 kHz?
The voltage noise density is 45 nV/√Hz at 1 kHz.
- What are the operating temperature ranges for the AD8508?
The operating temperature range is −40°C to +125°C.
- In what packages is the AD8508 available?
The AD8508 is available in 14-lead TSSOP and 14-ball WLCSP packages.
- What are some key applications of the AD8508?
Key applications include pressure and position sensors, remote security and bio sensors, IR thermometers, battery-powered consumer equipment, hazard detectors, and patient monitors.
- Why is the AD8508 suitable for battery-powered applications?
The AD8508 is suitable due to its low power consumption, high CMRR, and minimal errors caused by power supply voltage variations.
- What is the slew rate of the AD8508?
The slew rate is 0.013 V/µs.
- What is the power supply rejection ratio (PSRR) of the AD8508?
The PSRR is 100 dB to 110 dB.
