Overview
The AD8018ARU from Analog Devices Inc. is a dual, high-speed operational amplifier designed specifically for high-output current and low distortion applications, particularly in single-supply xDSL modems. Fabricated using ADI’s high-speed XFCB (eXtra Fast Complementary Bipolar) process, this amplifier is capable of driving low distortion signals to within 0.5 V of the power supply rail. It is optimized for use in broadband access networks, including xDSL, USB, PCI, and PCMCIA cards, as well as consumer DSL modems.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage | 3.3 | 8 | V | |
| Output Current | 400 | mA (into 10 Ω differential) | ||
| Bandwidth (–3 dB) | 130 | MHz | ||
| Slew Rate | 300 | V/μs | ||
| Voltage Noise Density | 4.5 | nV/√Hz | ||
| Out-of-Band SFDR | –82 | dBc (144 kHz to 500 kHz, RLOAD = 12.5 Ω, PLINE = 13 dBm) | ||
| Quiescent Current per Amplifier | 9 | mA | ||
| Logic Input Voltage (Logic “1”) | 2.0 | V | ||
| Logic Input Voltage (Logic “0”) | 0.8 | V | ||
| Package Type | 14-TSSOP |
Key Features
- High-speed operation with 130 MHz bandwidth and 300 V/μs slew rate.
- Rail-to-rail output voltage, capable of driving signals to within 0.5 V of the power supply rail.
- High output current 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 with a voltage noise density of 4.5 nV/√Hz.
- Low power operation with a quiescent current of 9 mA per amplifier.
- Flexible standby and shutdown modes controlled by two digital logic bits (PWDN1 and PWDN0).
- Surface-mount technology in a compact 14-TSSOP package.
- Compatibility with various protocols including VDSL2, ADSL2+, and G.shdsl.
Applications
- Broadband access networks.
- Fiber-to-the-curb (FTTC) applications.
- Very high-speed digital subscriber line 2 (VDSL2) systems.
- Asymmetric digital subscriber line 2+ (ADSL2+) applications.
- G.shdsl broadband communication systems.
- USB, PCI, and PCMCIA cards.
- Consumer DSL modems.
Q & A
- What is the primary application of the AD8018ARU?
The AD8018ARU is primarily used in high-speed digital subscriber line (xDSL) applications, including broadband access networks, VDSL2, ADSL2+, and G.shdsl systems.
- What is the output current capability of the AD8018ARU?
The AD8018ARU can drive up to 400 mA of current into a differential load of 10 Ω.
- What is the bandwidth of the AD8018ARU?
The AD8018ARU has a bandwidth of 130 MHz.
- What is the slew rate of the AD8018ARU?
The slew rate of the AD8018ARU is 300 V/μs.
- What are the standby and shutdown modes of the AD8018ARU?
The AD8018ARU has flexible standby and shutdown modes controlled by two digital logic bits (PWDN1 and PWDN0), allowing for full power, standby (outputs low impedance), and shutdown (outputs high impedance) modes.
- What is the quiescent current of the AD8018ARU per amplifier?
The quiescent current of the AD8018ARU is 9 mA per amplifier.
- What is the package type of the AD8018ARU?
The AD8018ARU is available in a 14-TSSOP package.
- What is the operating voltage range of the AD8018ARU?
The operating voltage range of the AD8018ARU is from 3.3 V to 8 V.
- How does the AD8018ARU manage noise and distortion?
The AD8018ARU features low noise with a voltage noise density of 4.5 nV/√Hz and low single-tone distortion of –86 dBc at 6 V p-p into a differential 10 Ω load at 100 kHz.
- What are the key benefits of using the AD8018ARU in xDSL applications?
The key benefits include high-speed operation, low power consumption, high output current, low distortion, and compatibility with various xDSL protocols.
