Overview
The AD8611ARM-R2, produced by Analog Devices Inc., is an ultrafast, single-supply comparator with a propagation delay of 4 ns. This device is part of the AD8611/AD8612 family, which includes single and dual comparators with latch function and complementary output. The AD8611 is designed to operate over the industrial temperature range of −40°C to +85°C and is available in 8-lead MSOP and narrow 8-lead SOIC surface-mount packages.
The AD8611 offers several key improvements over its predecessors, such as the LT1016 and LT1394, including lower supply current, a wider common-mode input range that includes the negative supply rail, and a higher output voltage swing. These features make it an excellent choice for timing circuits, line receivers, and clock recovery applications.
Key Specifications
| Parameter | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Propagation Delay | tPD | - | 4 | - | ns |
| Supply Current (V+) | I+ | 5.7 | - | 10 | mA |
| Ground Supply Current | IGND | 3.5 | - | 7 | mA |
| V- Supply Current | I- | 2.2 | - | 4 | mA |
| Offset Voltage | VOS | 1 | - | 7 | mV |
| Input Bias Current | IB | -6 | -4.0 | -7 | μA |
| Input Common-Mode Voltage Range | VCM | 0 | - | 1.0 | V |
| Common-Mode Rejection Ratio | CMRR | - | - | 55 | dB |
| Total Analog Supply Voltage | VCC | - | - | 7.0 | V |
| Operating Temperature Range | TA | -40 | - | 85 | °C |
Key Features
- Ultrafast Propagation Delay: 4 ns propagation delay, making it suitable for high-speed applications such as timing circuits and line receivers.
- Matched Delay: Propagation delays for rising and falling signals are closely matched and tracked over temperature, ideal for clock recovery.
- Low Supply Current: Lower supply current compared to predecessors like the LT1016 and LT1394.
- Wide Common-Mode Input Range: Includes the negative supply rail, extending down to the negative supply voltage and within 2 V of the positive supply voltage.
- High Output Voltage Swing: Can swing within 200 mV of ground and within 1.5 V of the positive supply voltage.
- Latch Function: Features a latch function, though it is not functional if VCC is less than 4.3 V.
- Complementary Output: Provides complementary output signals.
- Industrial Temperature Range: Specified over the industrial temperature range of −40°C to +85°C.
Applications
- Timing Circuits: The fast propagation delay and matched rising and falling edges make it ideal for timing circuits.
- Line Receivers: Suitable for line receiver applications due to its high speed and low delay.
- Clock Recovery: The matched delay ensures that the duty cycle of the output matches the duty cycle of the input, making it a good choice for clock recovery.
- High-Speed Analog-to-Digital Converters (ADCs): Can be used as an upgrade for LT1394 and LT1016 designs in high-speed ADC applications.
Q & A
- What is the propagation delay of the AD8611?
The propagation delay of the AD8611 is 4 ns.
- What are the package options for the AD8611?
The AD8611 is available in 8-lead MSOP and narrow 8-lead SOIC surface-mount packages.
- What is the operating temperature range of the AD8611?
The AD8611 operates over the industrial temperature range of −40°C to +85°C.
- What is the input common-mode voltage range of the AD8611?
The input common-mode voltage range extends down to the negative supply voltage and within 2 V of the positive supply voltage.
- How does the AD8611 compare to the LT1016 and LT1394 in terms of supply current?
The AD8611 has lower supply current compared to the LT1016 and LT1394.
- What is the latch function in the AD8611, and under what conditions is it not functional?
The AD8611 features a latch function, but it is not functional if VCC is less than 4.3 V.
- What are the key applications of the AD8611?
The AD8611 is suitable for timing circuits, line receivers, clock recovery, and high-speed analog-to-digital converters (ADCs).
- How does the AD8611 handle source resistance and input capacitance?
Source impedances must be less than 1 kΩ for best performance, and minimizing resistance from the source to the comparator input is necessary to minimize propagation delay.
- What is the output voltage swing of the AD8611?
The AD8611 can swing within 200 mV of ground and within 1.5 V of the positive supply voltage.
- What are the absolute maximum ratings for the AD8611?
The total analog supply voltage is 7.0 V, and the input voltage must be between VCC +0.3 V and VEE −0.3 V.
