Overview
The AD8018ARZ, produced by Analog Devices Inc., is a dual high-speed, low-cost amplifier designed for applications requiring high output current and low distortion. This component is particularly suited for single-supply xDSL modems where the ability to drive signals close to the power supply rails is crucial. The AD8018 features Analog Devices' proprietary XFCB (eXtra Fast Complementary Bipolar) process, which enables high bandwidth and fast slew rates, minimizing distortion while maintaining low power consumption.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage | 3.3 | 8 | V | |
| Output Current | 400 | mA | ||
| Bandwidth (–3 dB) | 130 | MHz | ||
| Slew Rate | 300 | V/μs | ||
| Quiescent Current per Amplifier | 9 | mA | ||
| Input Bias Current | 240 | nA | ||
| Power Supply Rejection Ratio | 50 | 55 | dB | |
| Common Mode Rejection Ratio | 52 | 56 | dB | |
| Operating Temperature Range | –40 | 85 | °C | |
| Package Type | 8-Lead SOIC, 14-Lead TSSOP |
Key Features
- Rail-to-rail output voltage, allowing signals to swing within 0.5 V of either power supply rail.
- High output current capability of 400 mA into a differential load of 10 Ω.
- Low single-tone distortion of –86 dBc at 6 V p-p into a differential 10 Ω load at 100 kHz.
- Low noise operation with a voltage noise density of 4.5 nV/√Hz at 100 kHz.
- High speed performance with a bandwidth of 130 MHz and a slew rate of 300 V/μs.
- Flexible standby and shutdown modes controlled by two digital logic bits (PWDN1 and PWDN0).
- Low quiescent current of 9 mA per amplifier.
Applications
- xDSL and ADSL modems where high output current and low distortion are critical.
- USB, PCI, and PCMCIA cards.
- Consumer DSL modems.
- Twisted pair line drivers.
Q & A
- What is the typical output current of the AD8018?
The AD8018 can deliver up to 400 mA of output current.
- What is the bandwidth of the AD8018?
The bandwidth of the AD8018 is 130 MHz (–3 dB).
- What is the slew rate of the AD8018?
The slew rate of the AD8018 is 300 V/μs.
- What are the standby and shutdown modes of the AD8018?
The AD8018 has three modes controlled by two digital logic bits (PWDN1 and PWDN0): full power, standby (outputs low impedance), and shutdown (outputs high impedance).
- What is the quiescent current per amplifier of the AD8018?
The quiescent current per amplifier is typically 9 mA.
- What are the typical operating supply voltages for the AD8018?
The AD8018 operates from a supply voltage range of 3.3 V to 8 V.
- What is the input bias current of the AD8018?
The input bias current is typically 240 nA.
- What are the package options for the AD8018?
The AD8018 is available in 8-lead SOIC and 14-lead TSSOP packages.
- What are some common applications of the AD8018?
Common applications include xDSL and ADSL modems, USB, PCI, and PCMCIA cards, and twisted pair line drivers.
- How does the AD8018 manage thermal issues?
The AD8018 requires careful PCB layout to manage thermal issues, including a ground plane and avoiding ground plane removal near input and output pins to reduce stray capacitance.
