Overview
The AD8655ARZ from Analog Devices Inc. is a precision CMOS operational amplifier known for its low noise and high precision performance. It is part of the AD8655/AD8656 series, which are recognized as the industry’s lowest noise, precision CMOS amplifiers. These amplifiers utilize Analog Devices’ DigiTrim® technology to achieve high dc accuracy, making them ideal for a variety of applications requiring low voltage and high dynamic range.
The AD8655ARZ operates over a supply voltage range of 2.7 V to 5.5 V and is fully specified over the temperature range of −40°C to +125°C. It is available in Pb-free, 8-lead MSOP and SOIC packages, making it suitable for automotive and other demanding applications.
Key Specifications
| Parameter | Symbol | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Offset Voltage | VOS | RL = 1 kΩ | - | - | 250 µV | µV |
| Offset Voltage Drift | - | - | 0.4 µV/°C | 2.3 µV/°C | µV/°C | |
| Input Voltage Noise Density | - | f = 10 kHz | - | 2.7 nV/√Hz | nV/√Hz | |
| Total Harmonic Distortion + Noise | THD + N | G = 1, RL = 1 kΩ, f = 1 kHz, VIN = 2 V p-p | - | 0.0007 % | % | |
| Gain Bandwidth Product | GBP | - | - | 28 MHz | MHz | |
| Slew Rate | SR | RL = 10 kΩ | - | 11 V/µs | V/µs | |
| Settling Time | ts | VIN = 0 V to 2 V step, G = +1 | - | 370 ns | ns | |
| Phase Margin | - | CL = 0 pF | - | 69 degrees | degrees | |
| Supply Voltage | VS | - | 2.7 V | 5.5 V | V | |
| Supply Current/Amplifier | ISY | VO = 0 V | 3.7 mA | 4.5 mA | mA | |
| Output Current | IOUT | VOUT = ±0.5 V | - | ±220 mA | mA |
Key Features
- Low Noise: The AD8655ARZ features a low input voltage noise density of 2.7 nV/√Hz at 10 kHz, making it suitable for applications requiring high signal integrity.
- High Precision: It offers high dc accuracy with a maximum offset voltage of 250 µV and an offset voltage drift of 0.4 µV/°C.
- Rail-to-Rail Input/Output: The ability to swing rail-to-rail at both the input and output enables the buffering of wide dynamic range devices in single-supply systems.
- High Gain Bandwidth Product: With a gain bandwidth product of 28 MHz, it supports high-frequency applications.
- Low Total Harmonic Distortion + Noise (THD + N): A THD + N of 0.0007% at G = 1, RL = 1 kΩ, f = 1 kHz, and VIN = 2 V p-p ensures low distortion in audio and other applications.
- High Output Current Capability: It can deliver up to ±220 mA of output current, making it suitable for driving loads in various applications.
- Wide Operating Temperature Range: Fully specified over the temperature range of −40°C to +125°C, making it suitable for automotive and industrial applications.
Applications
- ADC and DAC Buffers: Ideal for buffering analog-to-digital converters (ADCs) and digital-to-analog converters (DACs) due to its rail-to-rail input/output capability.
- Audio Applications: Suitable for microphone pre-amps and audio mixing consoles due to its low noise, low distortion, and high output current capability.
- Industrial Controls: Used in precision filters, data acquisition, and process control systems where high precision and low noise are critical.
- Digital Scales: Its high precision makes it suitable for use in digital scales and other precision measurement instruments.
- Automotive Applications: Qualified for automotive applications, including collision avoidance systems and other safety-critical systems.
- PLL Filters: Used in phase-locked loop (PLL) filters due to its high precision and low noise characteristics.
Q & A
- What is the input voltage noise density of the AD8655ARZ at 10 kHz?
The input voltage noise density of the AD8655ARZ at 10 kHz is 2.7 nV/√Hz.
- What is the maximum offset voltage of the AD8655ARZ?
The maximum offset voltage of the AD8655ARZ is 250 µV.
- What is the gain bandwidth product of the AD8655ARZ?
The gain bandwidth product of the AD8655ARZ is 28 MHz.
- What is the slew rate of the AD8655ARZ?
The slew rate of the AD8655ARZ is 11 V/µs with RL = 10 kΩ.[
- What is the output current capability of the AD8655ARZ?
The AD8655ARZ can deliver up to ±220 mA of output current.[
- What is the operating temperature range of the AD8655ARZ?
The AD8655ARZ is fully specified over the temperature range of −40°C to +125°C.[
- What are some common applications of the AD8655ARZ?
The AD8655ARZ is commonly used in ADC and DAC buffers, audio applications, industrial controls, digital scales, automotive applications, and PLL filters.[
- What packaging options are available for the AD8655ARZ?
The AD8655ARZ is available in Pb-free, 8-lead MSOP and SOIC packages.[
- Does the AD8655ARZ support rail-to-rail input/output?
Yes, the AD8655ARZ supports rail-to-rail input/output, enabling it to buffer wide dynamic range devices in single-supply systems.[
- What technology does the AD8655ARZ use to achieve high dc accuracy?
The AD8655ARZ leverages Analog Devices’ DigiTrim® technology to achieve high dc accuracy.[
