Overview
The AD8561AR, produced by Analog Devices Inc., is an ultrafast single-supply comparator with a propagation delay of just 7 ns. This device features separate input and output sections, allowing the input stage to be operated from either ±5 V dual supplies or a single +5 V supply. The AD8561AR is designed for high-speed applications, making it suitable for timing circuits, line receivers, clock recovery, and digital communications. It is available in 8-lead plastic DIP, TSSOP, and narrow SOIC surface-mount packages, and is specified over the industrial temperature range of –40°C to +85°C.
Key Specifications
| Parameter | Symbol | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|---|
| Propagation Delay | - | VCC = 5 V | - | 7 | - | ns |
| Offset Voltage | VOS | -40°C ≤ TA ≤ +85°C | 2.3 | 7 | 8 | mV |
| Offset Voltage Drift | ΔVOS/ΔT | - | - | 4 | - | μV/°C |
| Input Bias Current | IB | VCM = 0 V | -6 | -3 | -3.5 | μA |
| Input Offset Current | IOS | VCM = 0 V | - | - | ±4 | μA |
| Input Common-Mode Voltage Range | VCM | - | 0.0 | - | +3.0 | V |
| Common-Mode Rejection Ratio | CMRR | 0 V ≤ VCM ≤ +3.0 V | 65 | 85 | - | dB |
| Large Signal Voltage Gain | AVO | RL = 10 kΩ | - | 3000 | - | V/V |
| Input Capacitance | CIN | - | - | 3 | - | pF |
Key Features
- Ultrafast 7 ns propagation delay at 5 V single supply operation.
- Single supply operation: 3 V to 10 V.
- Low power latch function.
- Separate input and output sections.
- Input stage can be operated from ±5 V dual supplies or +5 V single supply.
- Closely matched propagation delays for rising and falling signals that track over temperature.
- Wider common-mode input range, including the negative supply rail.
- Available in 8-lead plastic DIP, TSSOP, and narrow SOIC surface-mount packages.
- Latch input for data retention with setup and hold times of 2 ns and 3 ns, respectively.
Applications
- High-speed timing circuits.
- Clock recovery and clock distribution.
- Line receivers.
- Digital communications.
- Phase detectors.
- High-speed sampling.
- Read channel detection.
- PCMCIA cards.
- Upgrade for LT1016 designs.
Q & A
- What is the propagation delay of the AD8561AR?
The AD8561AR has a propagation delay of 7 ns at 5 V single supply operation. - What are the supply voltage ranges for the AD8561AR?
The AD8561AR can operate from ±5 V dual supplies or a single supply of 3 V to 10 V. - What are the key package options for the AD8561AR?
The AD8561AR is available in 8-lead plastic DIP, TSSOP, and narrow SOIC surface-mount packages. - What is the temperature range for the AD8561AR?
The AD8561AR is specified over the industrial temperature range of –40°C to +85°C. - What is the purpose of the latch input on the AD8561AR?
The latch input allows for data retention at the output, with setup and hold times of 2 ns and 3 ns, respectively. - How does the AD8561AR compare to the LT1016?
The AD8561AR has the same pinout as the LT1016 but offers lower supply current and a wider common-mode input range. - What are some common applications for the AD8561AR?
Common applications include high-speed timing circuits, clock recovery, line receivers, digital communications, phase detectors, and high-speed sampling. - What is the input bias current of the AD8561AR?
The input bias current is typically –3 μA with a range of –6 μA to –3.5 μA over the temperature range. - How can hysteresis be added to the AD8561AR?
Hysteresis can be added through the use of positive feedback, which is beneficial in noisy environments. - What is the common-mode rejection ratio (CMRR) of the AD8561AR?
The CMRR is 65 dB to 85 dB over the common-mode voltage range.
